ORCID Profile
0000-0002-7640-711X
Current Organisation
University of Western Australia
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Civil Engineering | Structural Engineering | Construction Materials |
Cement and Concrete Materials | Cement Products and Concrete Materials | Metals (e.g. Composites, Coatings, Bonding) | Civil Construction Design
Publisher: Wiley
Date: 28-06-2019
Publisher: Elsevier BV
Date: 02-2021
Publisher: Universitat Politècnica València
Date: 27-06-2018
DOI: 10.4995/ASCCS2018.2018.7200
Abstract: Spiral welded stainless tubes are produced by helical welding of a continuous strip of stainless steel. Recently, concrete-filled spiral welded stainless steel tubes have found increasing application in the construction industry due to their ease of fabrication and aesthetic appeal. However, an in-depth understanding of the behaviour of this type of structure is still needed due to the lack of proper design guidance and insufficient experimental verification. In this paper, the mechanical performance of concrete-filled spiral welded stainless steel tubes will be numerically investigated with a commercial finite element software package, through which an experimental program can be designed properly. Specifically, the proposed finite element models take into account the effects of material and geometric nonlinearities. Moreover, the initial imperfections of stainless steel tubes and the form of helical welding will be appropriately included. Enhancement of the understanding of the analysis results can be achieved by extending results through a series of parametric studies based on the developed finite element model. Thus, the effects of various design parameters will be further evaluated by using the developed finite element model. Furthermore, for the purposes of wide application of such types of structure, the accuracy of the behaviour prediction in terms of ultimate strength based on current design codes will be studied. The authors herein compared the load capacity between the finite element analysis results and the existing codes of practice.
Publisher: Elsevier BV
Date: 04-2015
Publisher: Elsevier BV
Date: 06-2019
Publisher: American Society of Civil Engineers (ASCE)
Date: 12-2019
Publisher: Wiley
Date: 25-05-2023
Abstract: Studies have found utilization of recycled aggregate concrete (RAC) for engineering use to be environmentally favorable by preserving natural resources and limiting waste reduction. However, the use of RAC has not been effectively integrated in the industry due to limited research overlying the critical areas of its creep and shrinkage behavior. Hence, this study aims to investigate the natural aggregate concrete creep and shrinkage prediction models and perform recycled concrete aggregate (RCA) replacement level and water absorption modifications to illustrate the presence and behavior of RAC. Comparative analysis was undertaken by establishing comprehensive conventional concrete and RAC experimental databases and investigating several creep and shrinkage prediction models including, ACI 209R‐92, Bazant–Baweja B3, CEB MC 90, GL 2000, MC 2010, and JSCE 2010. The Bazant–Baweja B3 model was found to present the most optimal results by evaluating each conventional model against the RAC databases and performing regression analysis. Hence, the Bazant–Baweja B3 natural aggregate concrete models for creep and shrinkage were then effectively modified to illustrate the presence of RCA replacement level and water absorption. The adjusted models were verified with a set of experimental databases which successfully presented favourable results with coefficient of correlation factors increased from an average of 0.76 to 0.9.
Publisher: Wiley
Date: 05-02-2020
Abstract: This experimental study investigated the load–displacement behavior, ultimate strength, and failure modes of hollow and concrete‐filled high‐strength glass fiber‐reinforced polymer (GFRP) tubes under static and cyclic axial compression. For this purpose, pultruded GFRP tubes were used which contained fibers oriented at 0 ° , +45 ° , and −45 ° to the longitudinal axes of the tubes. Self‐compacting concrete (SCC) was used for in‐filling the hollow GFRP tubes. The main parameters considered in the test program were the tube cross‐section, column length, and cyclic loading range. A total of 28 specimens of lengths equal to either 0.5 or 1.5 m were tested under static and cyclic axial compressive loading. The experimentally obtained load–displacement and load‐axial/hoop strain behaviors are discussed in this paper. It was verified that in‐filling the GFRP tubes with concrete can enhance their axial strength and stiffness, though it is not able to prevent the brittle nature of the failure. Hollow GFRP tubes displayed linear‐elastic behavior with a constant axial stiffness up to failure under both static and cyclic loading, while the concrete‐filled specimens exhibited a bilinear load–displacement behavior with the change in stiffness occurring at the point at which the GFRP tube starts to act as a confining jacket. Under cyclic loading, the concrete‐filled specimens suffered degradation in axial stiffness with the rate of deterioration decreasing with increasing number of cycles. However, a consistent relationship between the cyclic load range magnitude and number of cycles to failure could not be found using the experimentally obtained data.
Publisher: MDPI AG
Date: 11-10-2019
DOI: 10.3390/NANO9101444
Abstract: Applications of heterogeneous photocatalytic processes based on semiconductor particles in cement-based materials have received great attention in recent years in enhancing the aesthetic durability of buildings and reducing global environmental pollution. Amongst all, titanium dioxide (TiO2) is the most widely used semiconductor particle in structural materials with photocatalytic activity because of its low cost, chemically stable nature, and absence of toxicity. Utilization of TiO2 in combination with cement-based materials would plunge the concentration of urban pollutants such as NOx. In fact, cementitious composites containing TiO2 have already found applications in self-cleaning buildings, antimicrobial surfaces, and air-purifying structures. This paper aims to present a comprehensive review on TiO2-based photocatalysis cement technology, its practical applications, and research gaps for further progression of cementitious materials with photocatalytic activity.
Publisher: Elsevier BV
Date: 02-2021
Publisher: Elsevier BV
Date: 11-2020
Publisher: Elsevier BV
Date: 03-2021
Publisher: Elsevier BV
Date: 09-2021
Publisher: Elsevier BV
Date: 10-2013
Publisher: Elsevier BV
Date: 12-2023
Publisher: SAGE Publications
Date: 05-10-2020
Abstract: Self-compacting concrete presents good workability to fill complicated forms without mechanical vibrations. This concrete is often reinforced with fibres to improve the strength and toughness. This study investigated the use of nickel -titanium (NiTi) shape memory alloy fibres in comparison with polypropylene and steel fibres in self-compacting concrete. The performances of the fresh fibre–reinforced self-compacting concrete are explored by slump flow and J-ring experiments. Meanwhile, the static and cyclic flexural tests are conducted to estimate the bending resistance strength performance, residual deformation and recovering capacity of shape memory alloy, polypropylene and steel fibre–reinforced self-compacting concrete. Moreover, the flexural toughness of the shape memory alloy, polypropylene and steel fibre–reinforced self-compacting concrete is calculated using four different codes. The shape memory alloy fibre–reinforced self-compacting concrete with 0.75% volume fraction presents the largest flexural strength, re-centering ability and toughness in comparison with polypropylene and steel fibre–reinforced self-compacting concretes. The experimental results demonstrated the beneficial influence of the shape memory and superelastic properties of NiTi in postponing initial crack formation and restricting the crack widths.
Publisher: American Society of Civil Engineers (ASCE)
Date: 2016
Publisher: Thomas Telford Ltd.
Date: 02-2019
Abstract: The use of glass-fibre-reinforced-polymer reinforcing bars instead of steel reinforcing bars is one of many ways to enhance the corrosion resistance of reinforced concrete structures. Fire performance of concrete members reinforced with fibreglass bars is a critical area that needs studying prior to using such bars in buildings and other structures vulnerable to fires. The mechanical properties of concrete and fibreglass as well as the bond between them can significantly deteriorate at high temperatures. The variations in bonding behaviour can affect the moment capacity of the structure, so it is necessary to know the bond strength degradation for structural design of fire safety and structural repair after fire. However, examination of bonding between fibreglass and concrete at elevated temperatures is quite challenging in practice and it needs a well-equipped experimental laboratory. In this study, fibreglass and concrete bond constitutive relationships are established for reinforced concrete subjected to fire. They are developed for the following purposes at high temperatures: to establish the compressive strength of concrete, ultimate tensile strength and modulus of elasticity of reinforcing bars, bond strength, slip at peak bond stress and bond stress–slip curve. The proposed relationships at elevated temperature are compared with experimental results.
Publisher: Elsevier BV
Date: 2021
Publisher: Thomas Telford Ltd.
Date: 2019
Abstract: Fibre-reinforced self-compacting concrete (FRSCC) is a high-performance building material that combines the positive aspects of the fresh properties of self-compacting concrete (SCC) with the improved characteristics of hardened concrete as a result of fibre addition. To produce SCC, either the constituent materials or the corresponding mix proportions may notably differ from conventional concrete (CC). Therefore, it is vital to investigate whether all the assumed hypotheses about CC are also valid for SCC structures. This paper reports a study in which eight SCC and FRSCC slabs of similar cross-section were monitored under service loads for up to 240 d. The recorded time-dependent cracking and deflections are presented. The steel strains within the high-moment regions, the concrete surface strains at the tensile steel level, deflection at the mid-span, crack widths and crack spacing were recorded throughout the testing period. The experimental results show that the instantaneous crack widths and spacings for the normal SCC slab series were close to and much less than, respectively, the corresponding variables for the normal CC slab series.
Publisher: Elsevier BV
Date: 05-2022
Publisher: Thomas Telford Ltd.
Date: 05-2019
Abstract: Self-compacting concrete (SCC) is an efficient new concrete that is flowable without segregation or bleeding and does not require additional compaction. The strength, workability, durability, carbon dioxide emissions and costs of four different mixes containing fly ash (FA), ground granulated blast-furnace slag (GGBS) and microsilica (MS) were investigated in the study described in this paper. Standard test methods were used to determine the workability, strength and durability of the mixes including resistance to chloride ion penetration, water penetration, water absorption and initial surface absorption. Compressive strength tests were also performed at different times after setting. The test results showed that the mixes containing FA, GGBS and MS presented better durability than normal concrete. Mixes with 10% MS provided good early strength and durability. In addition, the mixes containing FA, GGBS and MS were found to offer a significant reduction in cost but a slight increase in carbon dioxide emissions.
Publisher: Thomas Telford Ltd.
Date: 09-2020
Publisher: MDPI AG
Date: 07-10-2022
DOI: 10.3390/MA15196957
Abstract: Non-destructive evaluation using ultrasonic pulse velocity (Vp) testing has extensive applications in the concrete industry. With advances in construction technology, the use of ground granulated blast furnace slag (GGBFS) as a partial replacement to cement in a concrete mix is growing in popularity primarily because it reduces the initial capital cost of raw materials and the associated energy costs. This paper investigates the effect of the water-to-cement (wc) ratio and the cement content replaced by GGBFS on the development with time of the ultimate compressive strength (fc′) and the compression wave velocity (Vp) of mortar. The results showed that in the case of mortar with higher percentages of GGBFS replacement (where nucleation surfaces are more abundant), increasing wc can increase fc′ but cause a decrease in Vp. The posterior hydration process is highly dependent upon the water particles in the mixture after the first stage of hydration. After 7 days of curing, experimental results show that the fc′ of slag blended cement mix design wc ratio of 0.6 surpassed the fc′ value of an Ordinary Portland cement. A regression model correlating the fc′ and Vp of slag blended mortar is developed, which can be used to predict fc′ at concrete ages ranging from 1 day to 28 days for mixes with GGBFS percentage replacement values ranging from 15% to 45%.
Publisher: Elsevier BV
Date: 02-2022
DOI: 10.1016/J.NUT.2021.111498
Abstract: The aim of this study was to evaluate the quality of dietary assessment methods in randomized controlled trials focusing on in iduals with type 2 diabetes (T2DM), and its impact on the favorability of conclusions. MEDLINE, EMBASE, CINAHL, and CENTRAL were searched, from inception until September 2019 for RCTs of dietary interventions in in iduals with T2DM. Investigators assessed risk of bias and quality of the dietary measurements using the Cochrane Risk of Bias Assessment Tool 2.0 and the redeveloped EURICA tool, respectively. Random-effects meta-analysis assessed mean changes in hemoglobin (Hb)A1c. The study was conducted in accordance with the Preferred Reporting in Systematic Reviews and Meta-analyses. PROSPERO registration number: CRD42019146471. Of 2552 records retrieved, 23 studies met the inclusion criteria. Two studies were rated as good, 6 as medium, and 15 as poor in the quality assessment of the dietary measurement tool. All eight studies with higher quality of dietary assessment were associated with favorable conclusions. Among the 15 studies with poor quality, 5 failed to draw favorable conclusions. Among studies that sought to produce a reduction in HbA1c, 3 of 6 with better dietary assessment quality produced a significant difference of -0.38% (-0.67% to -0.08%), and 4 of 12 of poorer quality produced a significant difference of -0.26% (-0.37% to -0.14%). The poor quality of dietary assessment in clinical trials casts uncertainty on the dietary outcomes and the validity of possible causal mechanisms. Attention to the accuracy and reliability of dietary assessment methods is indicated.
Publisher: CRC Press
Date: 26-11-2013
DOI: 10.1201/B15320
Publisher: Elsevier BV
Date: 04-2021
Publisher: Elsevier BV
Date: 03-2020
Publisher: American Society of Civil Engineers (ASCE)
Date: 02-2020
Publisher: Elsevier BV
Date: 06-2019
Publisher: Elsevier BV
Date: 11-2019
Publisher: Elsevier BV
Date: 03-2019
Publisher: Elsevier BV
Date: 11-2012
Publisher: Elsevier BV
Date: 10-2020
Publisher: Elsevier BV
Date: 10-2014
Publisher: Elsevier BV
Date: 11-2021
Publisher: Elsevier BV
Date: 04-2021
Publisher: Elsevier BV
Date: 08-2020
Publisher: MDPI AG
Date: 20-04-2023
DOI: 10.3390/BUILDINGS13041091
Abstract: This paper summarizes a study focused on evaluating the post-fire performance of steel Intermediate Moment Frames (IMFs) following earthquakes. To this aim, archetypes comprising 3-bay IMFs with three different heights were seismically designed, and their two-dimensional finite element models were created in OpenSees software. The post-fire mechanical properties of steel were inserted into the models based on 64 different fire scenarios. The effects of different cooling methods are scrutinized at system level. To develop seismic fragility curves, Incremental Dynamic Analysis (IDA) was performed using 50 suites of far-field and near-field records, according to FEMA-P695. Then, the Collapse Margin Ratio (CMR) of each model was calculated based on the data from the fragility analysis. The results show that the seismic resistance of structures that experienced fire declines to some extent. In addition, the lowest safety level was observed when the structures were subjected to pulse-like near-field records.
Publisher: Elsevier BV
Date: 02-2022
Publisher: American Society of Civil Engineers (ASCE)
Date: 05-2019
Publisher: Canadian Science Publishing
Date: 07-2012
DOI: 10.1139/L2012-069
Abstract: Steel fibre reinforced self-compacting concrete (SFRSCC) is a relatively new composite material that combines the benefits of the self-compacting concrete (SCC) technology with the advantages derived from the fibre addition to a brittle cementitious matrix. Steel fibres improve many of the properties of SCC elements including tensile strength, ductility, toughness, energy absorption capacity, fracture toughness and cracking. Although the available research regarding the influence of steel fibres on the properties of SFRSCC is limited, this paper investigates the bond characteristics between steel fibre and SCC. Based on the available experimental results, the current analytical steel fibre pullout model is modified by considering the different SCC properties and different fibre types (smooth, hooked) and fibre inclination. To take into account the effect of fibre inclination in the pullout model, apparent shear strengths (τ (app) ) and slip coefficient (β) are incorporated to express the variation of pullout peak load and the augmentation of peak slip as the inclined angle increases. These variables are expressed as functions of the inclined angle (ϕ).
Publisher: Elsevier BV
Date: 03-2021
Publisher: Wiley
Date: 11-09-2019
Publisher: Elsevier BV
Date: 03-2020
Publisher: The Hong Kong Institute of Steel Construction
Date: 05-12-2018
Publisher: Elsevier BV
Date: 07-2023
Publisher: Elsevier
Date: 2022
Publisher: MDPI AG
Date: 11-03-2019
DOI: 10.3390/MA12050822
Abstract: In this study, the fresh and hardened state properties of heavyweight self-compacting concrete (HWSCC) and heavyweight high strength concrete (HWHSC) containing heavyweight magnetite aggregate with 50, 75, and 100% replacement ratio, and their performance at elevated temperatures were explored experimentally. For fresh-state properties, the flowability and passing ability of HWSCCs were assessed by using slump flow, T500 mm, and J-ring tests. Hardened-state properties including hardened density, compressive strength, and modulus of elasticity were evaluated after 28 days of mixing. High-temperature tests were also performed to study the mass loss, spalling of HWSCC and HWHSC, and residual mechanical properties at 100, 300, 600 and 900 °C with a heating rate of 5 °C/min. Ultimately, by using the experimental data, rational numerical models were established to predict the compressive strength and modulus of elasticity of HWSCC at elevated temperatures. The results of the flowability and passing ability revealed that the addition of magnetite aggregate would not deteriorate the workability of HWSCCs and they retained their self-compacting characteristics. Based on the hardened densities, only self-compacting concrete (SCC) with 100% magnetite content, and high strength concrete (HSC) with 75 and 100% magnetite aggregate can be considered as HWC. For both the compressive strength and elastic modulus, decreasing trends were observed by introducing magnetite aggregate to SCC and HSC at an ambient temperature. Mass loss and spalling evaluations showed severe crack propagation for SCC without magnetite aggregate while SCCs containing magnetite aggregate preserved up to 900 °C. Nevertheless, the mass loss of SCCs containing 75 and 100% magnetite content were higher than that of SCC without magnetite. Due to the pressure build-up, HSCs with and without magnetite showed explosive spalling at high temperatures. The residual mechanical properties analysis indicated that the highest retention of the compressive strength and modulus of elasticity after exposure to elevated temperatures belonged to HWSCC with 100% magnetite content.
Publisher: Elsevier BV
Date: 09-2021
Publisher: Wiley
Date: 06-07-2023
Abstract: Despite their low impact on the environment and excellent mechanical strength, alkali‐activated concretes (AAC) can potentially replace ordinary Portland cement based concrete (OPC). However, AAC can be eco‐friendly and more sustainable by incorporating agricultural waste such as rice husk ash (RHA). Therefore, this study investigated the impact of RHA on the strength and durability performance of ground granulated blast furnace slag (GGBS) based AAC. For this purpose, seven mixes were made, in which RHA partially substituted GGBS with an increment of 5% up to 30%. The results of the experiments show that the workability and unit weight of AAC mixes decreased as the amount of RHA in the mix increased. The compressive strength of AAC mixes lies between 39.78 and 64.80 MPa, which is adequate for structural application. The AAC showed similar trends for all the mixes in terms of water absorption, permeable voids, apparent porosity and sorptivity. Compared to other mixes, the 5% GGBS substituted with RHA yields the highest resistance against carbonation. Compared to the sulfuric acid (H 2 SO 4 ) cured s le, the specimen treated with hydrochloric acid (HCl) performed better in loss in mass, strength and ultrasonic pulse velocity. From scanning electron microscope test, the dense microstructure with pore refinement was observed in GGBS based AAC mix with 10% RHA content. According to the findings, RHA content up to 10% substitution can be used as a substitute for the binder to produce sustainable AAC with greater durability and could eventually replace conventional concrete in structural applications.
Publisher: Elsevier BV
Date: 02-2017
Publisher: Elsevier BV
Date: 07-2019
Publisher: Elsevier BV
Date: 08-2021
Publisher: Elsevier BV
Date: 02-2020
Publisher: Elsevier BV
Date: 03-2020
Publisher: Elsevier BV
Date: 02-2021
Publisher: Elsevier BV
Date: 02-2021
Publisher: MDPI AG
Date: 04-04-2019
DOI: 10.3390/MA12071120
Abstract: Today, the use of recycled aggregates as a substitute for a part of the natural aggregates in concrete production is increasing. This approach is essential because the resources for natural aggregates are decreasing in the world. In the present study, the effects of recycled concrete aggregates as a partial replacement for fine (by 50%) and coarse aggregates (by 100%) were examined in the self-compacting concrete mixtures which contain air-entraining agents and silica fumes. Two series of self-compacting concrete mixes have been prepared. In the first series, fine and coarse recycled mixtures respectively with 50% and 100% replacement with air entraining agent were used. In the second series, fine recycled (with 50% replacement) and coarse recycled (with 100% replacement) were used with silica fume. The rheological properties of the self-compacting concrete (SCC) were determined using slump-flow and J-ring tests. The tests of compressive strength, tensile strength, and compressive stress-strain behavior were performed on both series. The results indicated that air-entraining agent and silica fume have an important role in stabilization of fresh properties of the mixtures. The results of tests indicated a decrease in compressive strength, modulus of elasticity, and energy absorption of concrete mixtures containing air entrained agent. Also, the results showed that complete replacement (100%) with coarse recycled material had no significant effect on mechanical strength, while replacement with 50% fine recycled material has reduced compressive strength, tensile strength, and energy absorption.
Publisher: Elsevier BV
Date: 12-2019
Publisher: Elsevier BV
Date: 12-2020
Publisher: Elsevier BV
Date: 10-2021
Publisher: No publisher found
Date: 2022
Publisher: Elsevier BV
Date: 11-2020
Publisher: Elsevier BV
Date: 10-2019
Publisher: Elsevier BV
Date: 10-2020
Publisher: Japan Concrete Institute
Date: 02-10-2013
DOI: 10.3151/JACT.11.251
Publisher: Wiley
Date: 06-03-2019
Publisher: Elsevier BV
Date: 10-2021
Publisher: American Society of Civil Engineers (ASCE)
Date: 12-2018
Publisher: Elsevier BV
Date: 07-2022
Publisher: Elsevier BV
Date: 10-2023
Publisher: Elsevier BV
Date: 12-2019
Publisher: Elsevier BV
Date: 11-2020
Publisher: Zhejiang University Press
Date: 06-2012
Publisher: Springer Science and Business Media LLC
Date: 21-03-2014
Publisher: Elsevier BV
Date: 02-2019
Publisher: Elsevier BV
Date: 06-2020
Publisher: Elsevier BV
Date: 08-2019
Publisher: Elsevier BV
Date: 03-2021
Publisher: Elsevier BV
Date: 08-2021
Publisher: American Society of Civil Engineers (ASCE)
Date: 11-2018
Publisher: Elsevier BV
Date: 04-2023
Publisher: Elsevier
Date: 2020
Publisher: American Society of Civil Engineers (ASCE)
Date: 04-2022
Publisher: Elsevier BV
Date: 03-2022
Publisher: MDPI AG
Date: 12-12-2022
DOI: 10.3390/MA15248874
Abstract: Concrete wastes such as recycled concrete aggregates (RCA) make up a significant part of construction and demolition waste (C& DW) which can be used to minimize usage of natural aggregates and reduce carbon footprint. This paper studies the salt-scaling resistance of recycled aggregate concrete produced with pretreated RCAs. The test method for evaluating salt-scaling resistance in concrete according to DIN EN 1340: 2003 was performed. Four series of concrete mixes using natural aggregates, RCAs, manually pretreated RCA, and modified RCA in a desiccator were subjected to the different tests in terms of bulk electrical resistance in two directions (X and Y) before and after freeze-thaw cycles, ultrasonic pulse velocity, and weight loss of the surface layer of concrete specimens. Moreover, Scanning Electron Microscopy (SEM) of mixes was conducted and the microstructure of mixes considering the interface transition zone was studied. Results show that after exposure to cycles of freezing and thawing, the quality of concrete regarding ultrasonic pulse velocity did not change. The electrical resistance of specimens decreased significantly in X-direction and slightly in Y-direction after applying freeze-thaw cycles in all mixes. Nevertheless, surface modification of RCAs can increase electrical resistance and improve durability of concrete. SEM images show that the interface transition zone before and after freeze-thaw cycles remained unchanged which means strong bond between aggregate, new mortar, and old mortar. An estimation of the total charge passed indicated that all recycled aggregate concretes can be classified in a safe area and with very low chloride ion penetrability according to ASTM C1202.
Publisher: Wiley
Date: 28-06-2019
Publisher: Elsevier BV
Date: 09-2019
Publisher: Elsevier BV
Date: 10-2018
Publisher: Wiley
Date: 03-10-2022
Abstract: Despite offering several benefits in terms of environment and economics, few studies were conducted on the ground granulated blast furnace slag (GGBFS) based alkali‐activated concrete reinforced with recycled tire steel fibers (RTSFs). Therefore, this paper employed the Taguchi method to investigate and optimize the influence of GGBFS content, the alkaline solution to GGBFS content ratio, sodium hydroxide solution concentration, and RTSF volume fraction on splitting tensile strength (STS) of recycled tire steel fiber‐reinforced alkali‐activated slag concrete (RTSFR‐AASC). The microstructural evaluation was done through scanning electron microscopy, and Fourier transform infrared spectroscopy (FTIR) analyses. The results indicated that the fiber content, the most efficient parameter on STS, led to a considerable enhancement in the performance characteristic. Microstructural analysis proved the variations in formation of C–S–H gel. The results of the confirmation experiment on the proposed optimized RTSFR‐AASC mixture with the highest 28‐day STS (7.11 MPa) confirmed the effectiveness of the Taguchi method.
Publisher: Elsevier BV
Date: 2020
Publisher: Elsevier BV
Date: 11-2018
Publisher: American Society of Civil Engineers (ASCE)
Date: 2023
Publisher: Elsevier BV
Date: 2019
Publisher: Wiley
Date: 12-11-2019
Publisher: Elsevier BV
Date: 05-2022
Publisher: Thomas Telford Ltd.
Date: 09-2017
Abstract: The use of glass-fibre-reinforced polymer (GFRP) reinforcement as an alternative to steel for use in reinforced concrete (RC) structures has developed significantly in recent years. With excellent corrosion resistance, a high tensile strength to weight ratio and being non-magnetic and non-conductive, GFRP is an excellent solution for projects requiring improved corrosion resistance or reduced maintenance costs. However, despite a number of recent studies illustrating the effective use of GFRP rebars as longitudinal reinforcement for concrete compression members, the current international design codes do not recommend including GFRP reinforcement in the compression member capacity calculations. A test programme was thus carried involving the construction and testing of 17 rectangular concrete columns reinforced with steel or GFRP. This paper provides full derivations of the interaction diagrams for both steel- and GFRP-reinforced concrete columns. The interaction diagrams fitted the experimental data very well for both types of RC column. It was found that the GFRP-reinforced columns did not have a ‘balance point’ on the interaction diagram, and this was clearly shown for longitudinal reinforcement ratios above 3%. It was found that excluding the strength and stiffness of GFRP reinforcement from concrete compression calculations is conservative. Theoretical capacities better represent the experimental data when the strength and stiffness of GFRP reinforcement are included. The resulting factored interaction curves were exceeded by all experimental capacities.
Publisher: Elsevier BV
Date: 11-2019
Publisher: Elsevier BV
Date: 2020
Publisher: Elsevier BV
Date: 2022
Publisher: Elsevier BV
Date: 05-2021
Publisher: Elsevier BV
Date: 12-2019
Publisher: Elsevier BV
Date: 04-2022
Publisher: Elsevier BV
Date: 04-2017
Publisher: Elsevier BV
Date: 11-2020
Publisher: Elsevier BV
Date: 04-2021
Publisher: Elsevier BV
Date: 06-2022
Publisher: Elsevier BV
Date: 11-2017
Publisher: American Society of Civil Engineers (ASCE)
Date: 03-2016
Publisher: Springer Science and Business Media LLC
Date: 18-10-2015
Publisher: SAGE Publications
Date: 12-2012
DOI: 10.1260/1369-4332.15.12.2033
Abstract: Self-compacting concrete (SCC) can be placed under its own weight without compaction. In addition, it is cohesive enough to be handled without segregation and bleeding. Modification in the mix design of SCC can have a significant influence on the material's mechanical properties. Therefore, it is important to investigate whether all of the assumptions about conventional concrete (CC) design structures also valid for SCC construction. Bond behavior between concrete and reinforcement is a primary factor in the design of reinforced concrete structures. This study presents a bond strength model based on the experimental results from eight recent investigations of SCC and CC. In addition, the proposed model, code provisions, and empirical equations and experimental results from recent studies on the bond strength of SCC and CC are compared. The comparison is based on the measured bond between reinforcing steel and concrete utilizing the pullout test on the embedded bars at various heights in the mock-up structural elements to assess the top-bar effect on single bars in small prismatic specimens by conducting beam tests. The investigated varying parameters on bond strength are the: steel bar diameter, concrete compressive strength, concrete type, curing age of the concrete, and height of the embedded bar along the formwork.
Publisher: Elsevier BV
Date: 2022
Publisher: Informa UK Limited
Date: 21-04-2015
Publisher: Thomas Telford Ltd.
Date: 05-2023
Abstract: To impart electromagnetic interference (EMI) shielding in cementitious composites, electrically conductive and electromagnetic absorbing additives are generally used. This research examined the effect of adding electric arc furnace slag (EAFS) or heavyweight aggregates (HWA), alone and in combination with carbon fibre (CF), on the EMI shielding properties of cementitious composites. Different percentages of both additives were added to a control mix to study the effect on mechanical properties, electrical conductivity and EMI shielding. Optimal shielding was produced for aggregate contents of 1.5 wt%, with values of 5.18 dB for the EAFS mixes and 3.25 dB for the HWA mixes, within the frequency range 30 MHz to 1.5 GHz. Hybrid mixes were fabricated using 0.7 wt% of 12 mm long CF and three different percentages of each aggregate. In combination with the CF, the optimal level of shielding was produced with EAFS and HWA contents of 1 wt%. These optimal shielding levels were 34.21 dB and 36.78 dB, respectively, within the 30 MHz to 1.5 GHz frequency range. A further increase in either type of aggregate produced a gradual reduction in EMI shielding effectiveness.
Publisher: Elsevier BV
Date: 04-2021
Publisher: Elsevier BV
Date: 09-2020
Publisher: Thomas Telford Ltd.
Date: 2020
Abstract: This paper presents the results of an experimental investigation that was carried out with the aim of obtaining the load–displacement behaviour, ultimate strengths and failure modes of hollow and concrete-filled, high-strength, glass fibre-reinforced polymer (GFRP) tubes under axial and eccentric compression. The tubes that were used contained reinforcements at ±45° to the tube axis while self-compacting concrete (SCC) was used for the infill. The main parameters considered were column length, cross-section and load-eccentricity. A total 36 GFRP tubes, with cross-sections of 100 mm × 100 mm and 75 mm × 100 mm, were tested at lengths of 0·7 m and 1·3 m. Out of these, four were hollow GFRP tubes that were loaded concentrically. Eccentricities of 0, 5, 10 and 15 mm were considered for the concrete-filled tubes tested under axial load. It was observed that filling the tubes with SCC improved their stiffness, strength and ductility although the failure mode was still brittle akin to the behaviour of hollow tubes. The ends of the column specimens were found to be preferential locations for failure under both concentric and eccentric loading. It was also found that the in-filled concrete was able to utilise an enhanced compressive strength due to the confinement provided by the tube, although this effect decreased with eccentricity.
Publisher: MDPI AG
Date: 17-03-2020
DOI: 10.3390/NANO10030541
Abstract: Polymer matrix composites have generated a great deal of attention in recent decades in various fields due to numerous advantages polymer offer. The advancement of technology has led to stringent requirements in shielding materials as more and more electronic devices are known to cause electromagnetic interference (EMI) in other devices. The drive to fabricate alternative materials is generated by the shortcomings of the existing metallic panels. While polymers are more economical, easy to fabricate, and corrosion resistant, they are known to be inherent electrical insulators. Since high electrical conductivity is a sought after property of EMI shielding materials, polymers with fillers to increase their electrical conductivity are commonly investigated for EMI shielding. Recently, composites with nanofillers also have attracted attention due to the superior properties they provide compared to their micro counterparts. In this review polymer composites with various types of fillers have been analysed to assess the EMI shielding properties generated by each. Apart from the properties, the manufacturing processes and morphological properties of composites have been analysed in this review to find the best polymer matrix composites for EMI shielding.
Publisher: Elsevier BV
Date: 05-2018
Publisher: American Society of Civil Engineers (ASCE)
Date: 08-2018
Publisher: Springer Science and Business Media LLC
Date: 16-01-2014
Publisher: Elsevier BV
Date: 11-2022
Publisher: Elsevier BV
Date: 12-2021
Publisher: Elsevier BV
Date: 03-2021
Publisher: Thomas Telford Ltd.
Date: 02-2013
Abstract: The structural fire safety capacity of concrete is very complicated because concrete materials have considerable variations. Constitutive relationships for prestressed normal-strength concrete (NSC) and high-strength concrete (HSC) subjected to fire are needed to provide efficient modelling and to meet specific fire-performance criteria of the behaviour for prestressed concrete structures exposed to fire. In this paper, formulations for estimating the parameters affecting the behaviour of unconfined prestressed concrete at high temperatures are proposed. These formulations include residual compression strength, initial modulus of elasticity, peak strain, thermal strain, transient creep strain and the compressive stress–strain relationship at elevated temperatures. The proposed constitutive relationships are verified with available experimental data and existing models. The proposed relationships are general and rational, and show good agreement with the experimental data. More tests are needed to further verify and improve the proposed constitutive relationships.
Publisher: Thomas Telford Ltd.
Date: 08-2012
Abstract: A hysteretic stress–strain model is developed for unconfined concrete with the intention of providing efficient modelling for the structural behaviour of concrete in seismic regions. The proposed model is based on the findings of previous experimental and analytical studies. The model for concrete subjected to monotonic and cyclic loading comprises four components in compression and tension – an envelope curve (for monotonic and cyclic loading), an unloading curve, a reloading curve and a transition curve. Formulations for partial unloading and partial reloading curves are also presented. The reliability of the proposed constitutive model is investigated for a reinforced concrete member using a non-linear finite-element analysis program. Comparisons with test results showed that the proposed model provides a good fit to a wide range of experimentally established hysteresis loops.
Publisher: Elsevier BV
Date: 11-2018
Publisher: Thomas Telford Ltd.
Date: 05-2013
Abstract: Fibre-reinforced self-compacting concrete (FRSCC) is a high-performance building material that combines positive aspects of fresh properties of self-compacting concrete (SCC) with improved characteristics of hardened concrete as a result of fibre addition. Considering these properties, the application ranges of both FRSCC and SCC can be covered. A test program is carried out to develop information about the mechanical properties of FRSCC. For this purpose, four SCC mixes – plain SCC, steel, polypropylene and hybrid FRSCC – are considered in the test program. The properties include compressive and splitting tensile strengths, modulus of elasticity, modulus of rupture, and compressive stress–strain curve. These properties are tested at 3, 7, 14, 28, 56 and 91 days. Relationships are established to predict the compressive and splitting tensile strengths, modulus of elasticity, modulus of rupture, and compressive stress–strain curve. The models provide predictions matching the measurements.
Publisher: Thomas Telford Ltd.
Date: 08-2013
Abstract: Self-compacting concrete (SCC) can be placed and compacted under its own weight. Modifications in the mix design of SCC may significantly influence the material's mechanical properties. Therefore, it is vital to investigate whether all the assumed hypotheses about conventional concrete also hold true for SCC structures. This paper discusses an experimental programme that was carried out to study the effects of specimen size and shape on the compressive and tensile strength of SCC and fibre reinforced SCC. For this purpose, cube specimens with 100 and 150 mm dimensions and cylinder specimens with 100 × 200 and 150 × 300 mm dimensions were casted. The experimental programme examined four SCC mixtures: plain SCC, and steel-, polypropylene- and hybrid-fibre reinforced SCC. Compressive and tensile strengths were tested after 3, 7, 14, 28 and 56 days. The paper also investigates correlations between compressive and tensile strengths and the size and shape of the specimen.
Publisher: Elsevier BV
Date: 07-2021
Publisher: Elsevier BV
Date: 07-2019
Publisher: Elsevier BV
Date: 07-2019
Publisher: MDPI AG
Date: 16-10-2023
DOI: 10.3390/S23208486
Publisher: Wiley
Date: 02-05-2019
Publisher: Elsevier BV
Date: 05-2020
Publisher: Elsevier BV
Date: 08-2019
Publisher: Elsevier BV
Date: 06-2019
Publisher: World Scientific Pub Co Pte Ltd
Date: 2023
DOI: 10.1142/S2737599423300027
Abstract: This study proposes the design of modular structural geopolymer concrete elements incorporating decommissioned flexible flowlines. To evaluate and assess the feasibility of the proposed modular structural elements, this study aims to investigate its feasibility from the perspectives of sustainability including cost analysis, circular economy (CE) analysis and CO 2 emission estimate. Moreover, a series of numerical analyses using finite element modelling (FEM) is conducted to provide insight into the mechanical behaviour of such modular columns and beams. Apart from the cost-saving, CE and social impact benefits of the proposed elements, the results indicate that modular structural elements incorporating flowline have shown very high axial, shear and flexural capacities, which make them suitable to be used in high-rising buildings, bridges, etc. The proposed elements can be a solution to decommission and reuse the flexible flowline on a large scale in construction.
Publisher: Wiley
Date: 17-03-2021
Abstract: Generation of waste has been a significant problem in recent decades in many engineering fields. Self‐compacting rubberized concrete (SCRC) is a new type of SCC, which replaces part of natural aggregates by rubber aggregates in SCC to increase the application range of waste tyre rubber. This study investigates the effect of age and crumb rubber aggregate ratio on fresh and mechanical performance. Eight different SCRC mixtures using 2–5 mm rubber aggregates to replace 10%, 20%, 30%, and 40% natural aggregates by volume respectively, and 5–10 mm rubber aggregates to replace 10%, 20%, 30%, and 40% natural aggregates by volume respectively, are tested after 7, 28, 56, and 91 days for their mechanical properties. Results show that both the compressive and the tensile strength increase with the aging time, both of these properties drop with the amount and size of the crumb rubber content. Similar to compressive and tensile properties, flexural toughness and the modulus of rupture showed increased with the aging time. Small addition of crumb rubber has shown improvements in both rupture and fracture toughness properties, which diminishes when the crumb rubber content becomes significantly large.
Publisher: Springer Science and Business Media LLC
Date: 19-05-2021
Publisher: MDPI AG
Date: 08-09-2022
Abstract: Many of the construction materials available are known to cause a drastic level of damage to the environment during their manufacturing stages. Hence, many researchers have attempted to formulate construction materials that are more environmentally friendly. Additionally, the rise in wireless communications in recent decades has seen a rapid increase in electromagnetic pollution and interference, which affects the functionality of sensitive electronic devices. This research is focused on fabricating a more sustainable construction material that could prevent electromagnetic interference for electronic devices housed inside. Carbon fibres of three different lengths were added in four variations to a geopolymer control mix to study their effect on electromagnetic interference shielding. The results showed that the amount of shielding produced by these composites increases with carbon fibre length and quantity. Morphological analyses showed that the interconnectivity of the fibres plays a crucial role in having a high level of shielding. While the flexural strength showed an improvement with the addition of carbon fibre, the compressive strength showed a slight reduction with the increase in carbon fibre length. The optimal level of shielding was produced by the specimen containing 0.7% of 12 mm carbon fibre, which was the maximum amount of fibre of any length used in this study the optimal level of shielding generated was 43.43 dB within the frequency range of 30 MHz to 1.5 GHz.
Publisher: Elsevier BV
Date: 12-2021
Publisher: Elsevier BV
Date: 12-2020
Publisher: SAGE Publications
Date: 31-01-2019
Publisher: MDPI AG
Date: 04-03-2019
DOI: 10.3390/MA12050740
Abstract: Ambient-cured heavyweight geopolymer concrete (HWGC) is a new type of concrete that combines the benefits of both heavyweight concrete (HWC) and geopolymer concrete (GC). HWGC provides proper protection from the sources that emit harmful radiations in medical and nuclear industries. Furthermore, HWGC may also be used in offshore structures for pipeline ballasting and similar underwater structures. In this study, heavyweight aggregates (magnetite) have been used and replaced by normal-weight coarse aggregates in GC at volume ratios of 50, 75, and 100% to attain heavyweight classification according to British standards. This study investigates the impacts of high temperatures on standard ambient-cured geopolymer concrete and ambient-cured HWGC through its residual properties regarding compressive and tensile strengths, mass loss, spalling intensity, and flexural strength. The residual properties were examined by heating 100 × 200 mm cylinder specimens to 100, 300, 600, and 900 °C. The results indicated that the maximum compressive strengths of 40.1 and 39.0 MPa were achieved by HWGC at 300 and 100 °C, respectively. The overall result shows that the strength of HWGC increases by increasing magnetite aggregate proportion, while the mass loss, intensity of spalling, and loss of strengths is proportional to temperature after a certain point. Minor spalling with holes and cracking was observed only at 900 °C in HWGC.
Publisher: MDPI AG
Date: 13-02-2023
DOI: 10.3390/S23042084
Abstract: With the rapid development of communication technology as well as a rapid rise in the usage of electronic devices, a growth of concerns over unintentional electromagnetic interference emitted by these devices has been witnessed. Pioneer researchers have deeply studied the relationship between the shielding effectiveness and a few mixed design parameters for cementitious composites incoporating carbon fibres by conducting physical experiments. This paper, therefore, aims to develop and propose a series of prediction models for the shielding effectiveness of cementitious composites involving carbon fibres using frequency and mixed design parameters, such as the water-to-cement ratio, fibre content, sand-to-cement ratio and aspect ratio of the fibres. A multi-variable non-linear regression model and a backpropagation neural network (BPNN) model were developed to meet the different accuracy requirements as well as the complexity requirements. The results showed that the regression model reached an R2 of 0.88 with a root mean squared error (RMSE) of 2.3 dB for the testing set while the BPNN model had an R2 of 0.96 with an RMSE of 2.64 dB. Both models exhibited a sufficient prediction accuracy, and the results also supported that both the regression and the BPNN model are reasonable for such estimation.
Publisher: Elsevier BV
Date: 2023
Publisher: Wiley
Date: 11-02-2021
Publisher: Elsevier BV
Date: 10-2016
Publisher: SAGE Publications
Date: 28-05-2021
DOI: 10.1177/13694332211017994
Abstract: The fabric-reinforced cementitious matrix (FRCM) has been extensively studied and applied for the strengthening of masonry structures. Special attention needs to be given to the bonding properties between the FRCM and masonry substrate for strengthening applications. This paper presents a statistical analysis of the bonding properties based on the available literature. First, the collected test results were discussed in terms of the interfacial failure mode. Second, the factors influencing the ultimate bond load were analysed based on the different failure modes, and a corresponding prediction formula was further determined via regression analysis for interfacial debonding and slippage failures. Then, the characteristic values of the ultimate bond load were determined via a probabilistic method. Finally, the fracture energy for the slippage failure at the fabric-matrix interface was analysed, and a corresponding prediction formula was obtained via regression analysis. Additionally, some of the collected test results present higher dispersion due to the large variability of the FRCM material properties and the differences in the testing procedures used by different institutions. More studies are needed to improve the reliability of the proposed procedure.
Publisher: Elsevier BV
Date: 11-2019
Publisher: Trans Tech Publications, Ltd.
Date: 03-2015
Publisher: Thomas Telford Ltd.
Date: 09-2013
Abstract: In the present paper, a numerical and experimental study about creep and shrinkage behavior of a high strength self-compacting concrete is performed. Two new creep and shrinkage prediction models based on the comprehensive analysis on the available models of both conventional concrete and self-compacting concrete are proposed for high strength self-compacting concrete structures. In order to evaluate the predictability of the proposed models, an experimental program was carried out. A concrete which develops 60 MPa within 24 h was used to obtain experimental results. Several specimens were loaded: (i) at different ages and (ii) with different stress-to-strength ratios. Deformation in non-loaded specimens was also measured to assess shrinkage. All specimens were kept under constant stress during at least 600 days in a climatic chamber with temperature and relative humidity of 20°C and 50%, respectively. Results showed that the new models were able to predict deformations with good accuracy, although provided deformations overestimated slightly.
Publisher: Elsevier BV
Date: 08-2019
Publisher: Elsevier BV
Date: 12-2018
Publisher: Elsevier BV
Date: 02-2018
Publisher: Walter de Gruyter GmbH
Date: 2012
DOI: 10.2478/S13531-012-0015-3
Abstract: Steel fiber reinforced self-compacting concrete (SFRSCC) is a relatively new composite material which congregates the benefits of the self-compacting concrete (SCC) technology with the profits derived from the fiber addition to a brittle cementitious matrix. Steel fibers improve many of the properties of SCC elements including tensile strength, ductility, toughness, energy absorption capacity, fracture toughness and cracking. Although the available research regarding the influence of steel fibers on the properties of SFRSCC is limited, this paper investigates the bond characteristics between steel fiber and SCC firstly. Based on the available experimental results, the current analytical steel fiber pullout model (Dubey 1999) is modified by considering the different SCC properties and different fiber types (smooth, hooked) and inclination. In order to take into account the effect of fiber inclination in the pullout model, apparent shear strengths (τ (app)) and slip coefficient (β) are incorporated to express the variation of pullout peak load and the augmentation of peak slip as the inclined angle increases. These variables are expressed as functions of the inclined angle (ϕ). Furthurmore, steel-concrete composite floors, reinforced concrete floors supported by columns or walls and floors on an elastic foundations belong to the category of structural elements in which the conventional steel reinforcement can be partially replaced by the use of steel fibers. When discussing deformation capacity of structural elements or civil engineering structures manufactured using SFRSCC, one must be able to describe thoroughly both the behavior of the concrete matrix reinforced with steel fibers and the interaction between this composite matrix and discrete steel reinforcement of the conventional type. However, even though the knowledge on bond behavior is essential for evaluating the overall behavior of structural components containing reinforcement and steel fibers, information is hardly available in this area. In this study, bond characteristics of deformed reinforcing steel bars embedded in SFRSCC is investigated secondly.
Publisher: Elsevier BV
Date: 2017
Publisher: Elsevier BV
Date: 10-2021
Publisher: Elsevier BV
Date: 04-2022
Publisher: Thomas Telford Ltd.
Date: 10-2015
Abstract: The development of nanotechnology delivers materials with new properties and over recent years much effort has been made to incorporate nanoparticles (NPs) in concrete technology in order to enhance properties and produce concrete with improved performance. The durability and sustainability of concrete are becoming vitally important for the construction industry and, in this context, self-compacting concrete (SCC) has generated tremendous interest. SCC is a concrete that can be placed and compacted under its own weight with little or no vibration and without segregation or bleeding. It is used to facilitate and ensure proper filling and thus good structural performance of restricted areas and heavily reinforced structural members. It has gained increasing importance in recent years because of the advantages it offers. This paper presents an overview of previous studies on the effect of using NPs in SCC. Properties and methods concerning the use of NPs in SCC mixes, such as mixing procedure, mix proportion, heat of hydration, workability, setting time, mechanical strength and durability, are reviewed.
Publisher: Wiley
Date: 14-06-2020
Publisher: Elsevier BV
Date: 03-2019
Publisher: Elsevier BV
Date: 03-2020
Publisher: MDPI AG
Date: 23-01-2023
DOI: 10.3390/SU15032124
Abstract: The benefits of 3D concrete printing (3DCP) include reducing construction time and costs, providing design freedom, and being environmentally friendly. This technology is expected to be effective in addressing the global house shortage. This review highlights the main 3DCP applications and four critical challenges. It is proposed to combine 3D concrete printing with Digital Twin (DT) technology to meet the challenges the 3DCP faces and improve quality and sustainability. This paper provides a critical review of research into the application of DT technology in 3DCP, categorize the applications and directions proposed according to different lifecycles, and explore the possibility of incorporating them into existing 3DCP systems. A comprehensive roadmap was proposed to detail how DT can be used at different lifecycle stages to optimize and address the four main challenges of 3DCP, providing directions and ideas for further research.
Publisher: Elsevier BV
Date: 2021
Publisher: Elsevier BV
Date: 09-2021
Publisher: Elsevier BV
Date: 07-2021
Publisher: MDPI AG
Date: 28-03-2019
DOI: 10.3390/MA12071035
Abstract: Heavyweight self-compacting concrete (HWSCC) and heavyweight geopolymer concrete (HWGC) are new types of concrete that integrate the advantages of heavyweight concrete (HWC) with self-compacting concrete (SCC) and geopolymer concrete (GC), respectively. The replacement of natural coarse aggregates with magnetite aggregates in control SCC and control GC at volume ratios of 50%, 75%, and 100% was considered in this study to obtain heavyweight concrete classifications, according to British standards, which provide proper protection from sources that emit harmful radiations in medical and nuclear industries and may also be used in many offshore structures. The main aim of this study is to examine the fresh and mechanical properties of both types of mixes. The experimental program investigates the fresh properties of HWSCC and HWGC through the slump flow test. However, J-ring tests were only conducted for HWSCC mixes to ensure the flow requirements in order to achieve self-compacting properties. Moreover, the mechanical properties of both type of mixes were investigated after 7 and 28 days curing at an ambient temperature. The standard 100 × 200 mm cylinders were subjected to compressive and tensile tests. Furthermore, the flexural strength were examined by testing 450 × 100 × 100 mm prisms under four-point loading. The flexural load-displacement relationship for all mixes were also investigated. The results indicated that the maximum compressive strength of 53.54 MPa was achieved by using the control SCC mix after 28 days. However, in HWGC mixes, the maximum compressive strength of 31.31 MPa was achieved by 25% magnetite replacement s les. The overall result shows the strength of HWSCC decreases by increasing magnetite aggregate proportions, while, in HWGC mixes, the compressive strength increased with 50% magnetite replacement followed by a decrease in strength by 75% and 100% magnetite replacements. The maximum densities of 2901 and 2896 kg/m3 were obtained by 100% magnetite replacements in HWSCC and HWGC, respectively.
Publisher: Elsevier BV
Date: 08-2022
Publisher: Elsevier BV
Date: 10-2020
Publisher: MDPI AG
Date: 21-09-2022
DOI: 10.3390/SU141911887
Abstract: Fibre-reinforced polymers (FRP) have been presented as materials that possess properties that are comparable to conventional building materials, while also being more sustainable. This study describes the material and its properties and compares the materials using a life-cycle assessment (LCA) modelling approach. The objective of this paper is to perform a cradle-to-grave (from resource extraction to the disposal stage) analysis of pultruded FRP material and compare it to conventional building materials used in a typical dwelling. This analysis was conducted in accordance with LCA standard EN15978. A streamlined LCA was conducted, whereby the major impacts observed included the global warming potential in kilograms of carbon dioxide equivalent and the embodied energy in megajoule net calorific value. The products compared with the FRP profiles were the most commonly used materials in a residential dwelling bricks and timber. The results of the LCA modelling provided a comparative assertion of the FRPs to conventional materials by demonstrating that they perform better than double-brick dwellings and external timber framed walls in both environmental impact categories of global warming potential and embodied energy. The results shows that the FRP-walled house had the lowest emissions of carbon dioxide equivalent, which was around 17% lower than that of the double-brick wall and 1.46% less than that of the timber wall house.
Publisher: Elsevier BV
Date: 2018
Publisher: Elsevier BV
Date: 10-2020
Publisher: Wiley
Date: 31-08-2023
DOI: 10.1111/FFE.14135
Abstract: The fatigue performance of cementitious composites that affects the service life of structures is particularly sensitive to the initial defects in cementitious matrix and interfacial transition zone. Nano‐ZrO 2 (NZ), characterized by high strength and toughness as well as good dispersibility, can improve the compactness of cementitious composites. This paper investigated the modifying effect and mechanisms of NZ on the compressive fatigue performance of cementitious composites, including fatigue life, strength, and deformation behaviors. The experimental results show that adding NZ extends the fatigue life of cementitious composites by an order of magnitude and increases the fatigue failure strain by 11.9%. The microstructural analysis verifies that NZ can deflect the fatigue micro‐cracks, fill the micro‐pores and reduce the growth space of CH crystal size. The modified microstructures potentially lead to fatigue of cementitious composites starting from generating more nano‐cracks in both cementitious matrix and interfacial transition zone, thereby improving the fatigue performance of the composites.
Publisher: Elsevier BV
Date: 12-2021
Publisher: Elsevier BV
Date: 11-2020
Publisher: Elsevier BV
Date: 09-2020
Publisher: Informa UK Limited
Date: 2014
Start Date: 07-2018
End Date: 10-2021
Amount: $382,834.00
Funder: Australian Research Council
View Funded ActivityStart Date: 09-2022
End Date: 12-2023
Amount: $1,213,351.00
Funder: Australian Research Council
View Funded Activity