ORCID Profile
0000-0002-8147-7673
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Research Topics
In Research Link Australia (RLA), "Research Topics" refer to ANZSRC FOR and SEO codes. These topics are either sourced from ANZSRC FOR and SEO codes listed in researchers' related grants or generated by a large language model (LLM) based on their publications.
Top 5 Research Topics
ANZSRC Field of Research (FoR)
Civil Engineering | Structural Engineering | Construction Materials | Structural engineering | Construction Engineering | Environmental Technologies | Marine and Estuarine Ecology (incl. Marine Ichthyology) | Civil engineering | Geomechanics and Resources Geotechnical Engineering | Solid Mechanics | Mechanical Engineering | Structural Engineering | Construction materials
ANZSRC Socio-Economic Objective (SEO)
Cement and Concrete Materials | Expanding Knowledge in Engineering | Cement Products and Concrete Materials | Management of Solid Waste from Energy Activities | Metals (e.g. Composites, Coatings, Bonding) | Civil Construction Design | Environmentally Sustainable Construction not elsewhere classified | Metals (composites, coatings, bonding, etc.) | Hydrogen-based Energy Systems (incl. Internal Hydrogen Combustion Engines) | Management of Solid Waste from Construction Activities | Civil | Fisheries - Aquaculture not elsewhere classified | Civil | Construction Materials Performance and Processes not elsewhere classified | Port Infrastructure and Management |
Related Links
Publications
Methylcellulose stabilized multi-walled carbon nanotubes dispersion for sustainable cement composites
Publisher: Elsevier BV
Date: 08-2017
The role of alumina on performance of alkali-activated slag paste exposed to 50 C
Publisher: Elsevier BV
Date: 12-2013
Role of Multifunctional Sulfonated Graphene Oxide in Foam Concrete System: Reinforcement and Surfactant
Publisher: Springer Singapore
Date: 04-09-2019
Highly tunable anisotropic co-deformation of black phosphorene superlattices
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0NR04781C
Abstract: Intercalated hiphiles provide a new mechanism for tuning the band structure and electrical properties of phosphorene superlattices.
Damage-tolerant material design motif derived from asymmetrical rotation
Publisher: Springer Science and Business Media LLC
Date: 11-03-2022
DOI: 10.1038/S41467-022-28991-5
Abstract: Motifs extracted from nature can lead to significant advances in materials design and have been used to tackle the apparent exclusivity between strength and damage tolerance of brittle materials. Here we present a segmental design motif found in arthropod exoskeleton, in which asymmetrical rotational degree of freedom is used in damage control in contrast to the conventional interfacial shear failure mechanism of existing design motifs. We realise this design motif in a compression-resisting lightweight brittle material, demonstrating a unique progressive failure behaviour that preserves material integrity with 60–80% of load-bearing capacity at % of compressive strain. This rotational degree of freedom further enables a periodic energy absorbance pattern during failure yielding 200% higher strength than the corresponding cellular structure and up to 97.9% reduction of post-damage residual stress compared with ductile materials. Fifty material combinations covering 27 types of materials analysed display potential progressive failure behaviour by this design motif, thereby establishing a broad spectrum of potential applications of the design motif for advanced materials design, energy storage/conversion and architectural structures.
Quantification of evaporation induced error in atom probe tomography using molecular dynamics simulation
Publisher: Elsevier BV
Date: 11-2017
DOI: 10.1016/J.ULTRAMIC.2017.06.006
Abstract: Non-equilibrium molecular dynamics was used to simulate the dynamics of atoms at the atom probe surface and five objective functions were used to quantify errors. The results suggested that before ionization, thermal vibration and collision caused the atoms to displace up to 1Å and 25Å respectively. The average atom displacements were found to vary between 0.2 and 0.5Å. About 9 to 17% of the atoms were affected by collision. Due to the effects of collision and ion-ion repulsion, the back-calculated positions were on average 0.3-0.5Å different from the pre-ionized positions of the atoms when the number of ions generated per pulse was minimal. This difference could increase up to 8-10Å when 1.5ion/nm
Guided waves for damage identification in pipeline structures: A review
Publisher: Hindawi Limited
Date: 17-03-2017
DOI: 10.1002/STC.2007
Impact performances of steel tube-confined recycled aggregate concrete (STCRAC) after exposure to elevated temperatures
Publisher: Elsevier BV
Date: 02-2018
ZIF-8 derived ZnO–calcium silicate mesoporous structures: Synthesis and photocatalytic activity
Publisher: Elsevier BV
Date: 02-2022
Revealing Microstructural Modifications of Graphene Oxide-Modified Cement via Deep Learning and Nanoporosity Mapping: Implications for Structural Materials’ Performance
Publisher: American Chemical Society (ACS)
Date: 18-04-2022
Calibration of Eringen's small length scale coefficient for initially stressed vibrating nonlocal Euler beams based on microstructured beam model
Publisher: IOP Publishing
Date: 06-08-2013
Dispersion of carbon nanotubes with SDS surfactants: A study from a binding energy perspective
Publisher: Royal Society of Chemistry (RSC)
Date: 2011
DOI: 10.1039/C0SC00616E
Capillary bridges between unsaturated nano-mineral particles: a molecular dynamics study
Publisher: Royal Society of Chemistry (RSC)
Date: 2022
DOI: 10.1039/D1CP05041A
Abstract: We investigated the dynamic formation process of capillary bridges and visualised the distribution of water molecules in the capillary bridges.
Numerical modelling of plastic–damage response and crack propagation in RAC under uniaxial loading
Publisher: Thomas Telford Ltd.
Date: 05-2018
Abstract: In order to better understand the failure mechanism of recycled aggregate concrete (RAC), a numerical study on modelled recycled aggregate concrete (MRAC) was conducted to investigate the plastic–damage response and crack propagation under uniaxial loading. In the numerical model, the nanoscale mechanical properties and the thickness of the interfacial transition zones (ITZs) were obtained based on advanced nanoindentation. The constitutive relationships of new and old cement mortars and corresponding ITZs were developed using plastic–damage constitutive relationships. The effects of the relative mechanical properties between new and old cement mortars on the failure pattern and stress–strain response of MRAC were investigated. After calibration and verification with the uniaxial compression test, the numerical model was found to be able to reveal the failure pattern and stress–strain curves of MRAC under uniaxial tension. The results showed that microcracks usually first appear around the weak new and old ITZs, and then propagate into the new and old cement mortars. With an increase in the relative strength between new and old cement mortars, the microcrack initiation locations gradually shifted from the new ITZs to the old ITZs. Therefore, the numerical results can provide insight into the modification of RAC using mix design optimisation and ITZ enhancement.
Controlled growth and ordering of poorly-crystalline calcium-silicate-hydrate nanosheets
Publisher: Springer Science and Business Media LLC
Date: 11-08-2021
DOI: 10.1038/S43246-021-00191-6
Abstract: Optimising the mesoscale structure of calcium-silicate-hydrate (C-S-H) is critical to achieving durable and sustainable infrastructure using Portland cement concrete. However, control of its intricate formation process, which comprises spatially disordered growth of poorly-crystalline sheets, remains a challenge. Here, through combination of experimental and computer simulation techniques, we report a promising mechanism to control this complex growth process and thereby optimise the C-S-H nanostructure. The pivotal step was utilizing graphene oxide (GO) to restrain the inherent spatial deformations of the C-S-H sheets and guide their concurrent 2D growth and layer-by-layer ordering. Accordingly, we designed a layered GO–C-S-H composite that exhibits 1–2 orders of magnitude improvement in strength and durability compared with C-S-H formed without control. Our findings open a window for nano-engineering of cements and other complex layered materials for ceramic, pharmaceutical and energy applications.
Modification of fundamental vibration modes of circular plates with free edges
Publisher: Elsevier BV
Date: 11-2008
Quasi-static combined compression-shear crushing of honeycombs: An experimental study
Publisher: Elsevier BV
Date: 04-2019
Discussion: Effect of strain rate on splitting tensile strength of geopolymer concrete
Publisher: Thomas Telford Ltd.
Date: 08-2015
Effects of graphene oxide on early-age hydration and electrical resistivity of Portland cement paste
Publisher: Elsevier BV
Date: 04-2017
Graphene Oxide Impact on Hardened Cement Expressed in Enhanced Freeze–Thaw Resistance
Publisher: American Society of Civil Engineers (ASCE)
Date: 09-2016
Graphene oxide-reinforced thin shells for high-performance, lightweight cement composites
Publisher: Elsevier BV
Date: 04-2022
A review of dispersion of nanoparticles in cementitious matrices: Nanoparticle geometry perspective
Publisher: Elsevier BV
Date: 10-2017
Microstructural and polymer film interaction mechanisms: Insights of GO-reinforced polymer-modified cement composites
Publisher: Elsevier BV
Date: 12-2023
Nano-Impact Tests with Ultra-High Strain Rate Loading Using Graphene and Ion Impact
Publisher: World Scientific Pub Co Pte Lt
Date: 06-2016
DOI: 10.1142/S1758825116500435
Abstract: Strain rate is essential in study of the physics of fluids and solids undergoing deformation. State-of-art high strain rate tests have mainly been in macro-scale with an upper limit of [Formula: see text]. A graphene-based layered system is proposed to conduct nanometer-scale high strain rate testing. The process is investigated by molecular dynamics simulations. Accelerated single ion or group of ions are used to impact on the proposed system to generate ballistic or plate-like impact scenarios. The effects of impact energy, shape of impact absorber and the impaction location are investigated. The graphene layer is the key of the proposed system to spread the load and protect the s le. The results indicate that ion group and single ion impacts produce strain rates of [Formula: see text]–[Formula: see text] and [Formula: see text]–[Formula: see text], respectively. Ion group impact produces a more significant signal than single ion impact on the sensing nano-layer in the system. The ultimate strength of an Al-Cu alloy s le during ion impact is estimated to be 215[Formula: see text]MPa to 251[Formula: see text]MPa, significantly lower than predicted by the Johnson–Cook model because of the rapidly increased temperature and melting in the s le. The results demonstrate new possibilities for understanding high strain rate effects at nano-scale.
Optimizing the degree of carbon nanotube dispersion in a solvent for producing reinforced epoxy matrices
Publisher: Elsevier BV
Date: 11-2015
Hencky Bar-Chain Model for Buckling and Vibration of Beams with Elastic End Restraints
Publisher: World Scientific Pub Co Pte Lt
Date: 31-08-2015
DOI: 10.1142/S0219455415400076
Abstract: This paper presents the Hencky bar-chain model (HBM) for buckling and vibration analyses of Euler–Bernoulli beams with elastic end restraints. The Hencky bar-chain comprises rigid beam segments (of length a = L/n where L is the total length of beam and n the number of beam segments) connected by frictionless hinges with elastic rotational springs of stiffness EI/a where EI is the flexural rigidity of the beam. The elasticity and the mass of the beam are concentrated at the hinges with rotational springs. The key contribution of this paper lies in the modeling of the elastic end restraints of the Hencky bar-chain that will simulate the same buckling and vibration results as that furnished by the first-order central finite difference beam model (FDM) which was earlier shown to be analogous to the HBM. The establishment of such a physical discrete beam model allows one to obtain solutions for beam-like structure with repetitive cells (or elements) as well as to calibrate the Eringen's coefficient e 0 in the nonlocal beam theory that captures the small length scale effect.
Pore shape analysis using centrifuge driven metal intrusion: Indication on porosimetry equations, hydration and packing
Publisher: Elsevier BV
Date: 11-2017
Effects of graphene oxide aggregates on hydration degree, sorptivity, and tensile splitting strength of cement paste
Publisher: Elsevier BV
Date: 09-2017
Examination of cylindrical shell theories for buckling of carbon nanotubes
Publisher: World Scientific Pub Co Pte Ltd
Date: 21-11-2011
DOI: 10.1142/S0219455411004464
Abstract: This paper examines the validity and accuracy of cylindrical shell theories in predicting the critical buckling strains of axially loaded single-walled carbon nanotubes (CNTs). The shell theories considered are the Donnell thin shell theory (DST), the Sanders thin shell theory (SST), and the first-order shear deformation (thick) shell theory (FSDST). Molecular dynamic (MD) simulation solutions for armchair and zig-zag CNTs with cl ed ends were used as reference results to assess the shell models. The MD simulations were carried out at room temperature to eliminate the thermal effect on the buckling behavior. By adopting Young's modulus of 5.5 TPa, Poisson's ratio of 0.19, and tube thickness of 0.066 nm, it was found that DST is not able to capture the length dependency of the critical buckling strains and thus it should not be used for buckling analysis of CNTs. On the other hand, SST and FSDST are able to predict the critical buckling strains of armchair and zig-zag CNTs reasonably well for all aspect ratios, especially the results produced by the FSDST are found to be closer to the MD simulation results, because it allows for the effect of transverse shear deformation that becomes significant for CNTs with small aspect ratios. Thus, FSDST is recommended as a very suitable and convenient continuum mechanics model for buckling analysis of CNTs. The superior FSDST model is used to generate critical buckling strains of axially loaded single-walled CNT with different boundary conditions. These results should be useful for designers of nanodevices that make use of CNTs as axially loaded members. It is worth noting that for long and moderately long CNTs, the Timoshenko beam model may be used instead due to its simplicity.
Grid-based electron–solid interaction simulation for characterizing high-dimensional microstructures
Publisher: Elsevier BV
Date: 10-2020
Effects of nano-particles on failure process and microstructural properties of recycled aggregate concrete
Publisher: Elsevier BV
Date: 07-2017
Graphene oxide-coated Poly(vinyl alcohol) fibers for enhanced fiber-reinforced cementitious composites
Publisher: Elsevier BV
Date: 10-2019
Effects of carbon nanotubes on the early-age hydration kinetics of Portland cement using isothermal calorimetry
Publisher: Elsevier BV
Date: 05-2021
Spatial correlation and pore morphology analysis of limestone calcined clay cement (LC3) via machine learning and image-based characterisation
Publisher: Elsevier BV
Date: 10-2023
Distribution of carbon nanotubes in fresh ordinary Portland cement pastes: Understanding from a two-phase perspective
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C5RA13511G
Abstract: Study on distribution of carbon nanotubes (CNTs) in two phase cementitious system revealed the selective adsorption phenomenon of CNTs on cement particles and the time-dependent dispersion of CNTs in liquid phase.
Fly ash-based boroaluminosilicate geopolymers: Experimental and molecular simulations
Publisher: Elsevier BV
Date: 04-2017
A grillage model for predicting wrinkles in annular graphene under circular shearing
Publisher: AIP Publishing
Date: 02-01-2013
DOI: 10.1063/1.4772621
Abstract: This paper is concerned with a Timoshenko grillage model for modeling the wrinkling phenomenon in annular graphene under circular shearing applied at its inner edge. By calibrating the grillage model results against the molecular mechanics (MM) results, the grillage model comprising beams of elliptical cross-section orientated along the carbon-carbon bond has section dimensions of 0.06 nm for the major axis length and 0.036 nm for the minor axis length. Moreover, the beams are connected to one another at 0.00212 nm from the geometric centric. This eccentric connection of beams allows the proposed grillage model to cater for the cross-couplings among bonds that produce the out-of-plane wrinkling pattern. The out-of-plane to in-plane bending stiffnesses' ratio is 0.36, and the cross bending stiffness provided by the ellipse eccentricity is 0.025 times that of the in-plane bending stiffness. Besides furnishing identical wave numbers as well as litudes and wavelengths that are in good agreement with MM results, the grillage model can capture wrinkling patterns with a boundary layer, whereas plate and membrane models could not mimic the boundary layer.
Bond characteristics between ultra high modulus CFRP laminates and steel
Publisher: Elsevier BV
Date: 02-2012
Effects of CFRP bond locations on the Mode I stress intensity factor of centre-cracked tensile steel plates
Publisher: Wiley
Date: 27-06-2013
Transition and Stability of Copolymer Adsorption Morphologies on the Surface of Carbon Nanotubes and Implications on Their Dispersion
Publisher: American Chemical Society (ACS)
Date: 14-08-2014
DOI: 10.1021/LA502245S
Abstract: In this study, the adsorption morphologies as well as stability and transitions of a commercial dispersant copolymer (BYK 9076) on the surface of multiwalled carbon nanotubes (MWCNTs) were studied using Fourier transform infrared and UV-vis spectroscopy, dynamic light scattering, and electron microscopy techniques. The results show that the dispersion of carbon nanotubes in ethanol does not increase continuously with increasing copolymer/CNT ratio, which is correlated with the adsorption morphologies of the copolymer on the CNT surface. At a ratio of copolymer/CNT below 0.5, the morphology is random, shifting to a hemimicelle structure at a ratio from 0.5 to 1.0 while at ratios above 1.0, a cylindrical pattern is seen. The hemimicelle morphology is able to prevent the agglomeration of CNTs when the CNT concentration increases to 8.7 mg/mL, while cylindrical morphology is more efficient and stable to provide dispersion of CNTs at higher concentrations of CNTs.
Strain Relaxation of Monolayer WS2 on Plastic Substrate
Publisher: Wiley
Date: 26-10-2016
Carbon nanotube-cement composites: A retrospect
Publisher: Informa UK Limited
Date: 11-2011
Free vibration of nanorings/arches based on nonlocal elasticity
Publisher: AIP Publishing
Date: 07-2008
DOI: 10.1063/1.2951642
Abstract: This paper deals with the free vibration problem of nanorings/arches. The problem is formulated on the basis of Eringen’s nonlocal theory of elasticity in order to allow for the small length scale effect. Exact vibration frequencies are derived for the nanorings/arches and the effects of small length scale, defects, and elastic boundary conditions are investigated. The small length scale effect lowers the vibration frequencies. The defects and the use of elastic boundary conditions (instead of fixed restraints) also significantly reduce the frequencies and alter the vibration mode shapes of circular rings/arches. The results presented should be useful to engineers who are designing nanorings/arches for microelectromechanical and nanoelectromechanical devices.
Influence of ultrasonication on the dispersion and enhancing effect of graphene oxide–carbon nanotube hybrid nanoreinforcement in cementitious composite
Publisher: Elsevier BV
Date: 05-2019
Dynamic increased reinforcing effect of graphene oxide on cementitious nanocomposite
Publisher: Elsevier BV
Date: 05-2019
Driving Forces and Transportation Efficiency in Water Transportation Through Single-Walled Carbon Nanotubes
Publisher: ASME International
Date: 05-2012
DOI: 10.1115/1.4007540
Abstract: Based on the concept of an energy pump, water transportation in a carbon nanotube (CNT) is studied by molecular dynamics simulations. The influences of CNT pretwist angle, water mass, environmental temperature, CNT diameter, CNT channel length, and CNT channel restrain condition on driving force and transportation efficiency are investigated. It is found that in order to initiate the transportation, the pretwist angle must be larger than certain threshold, 80 deg, for the case of one water molecule in a restrained (8,0) CNT. Furthermore, driving force decreases with increasing water mass and it is more efficient to transport multiple water molecules than one water molecules. The water molecule is found to have higher degrees of collisions in a (8,0) CNT in elevated environmental temperature. By comparing three CNT channel lengths, the channel length of 19.80 nm is identified as a faster and more efficient transporter in an unrestrained (8,8) CNT. Finally, molecular dynamics (MD) simulation indicates that a water molecule can only be transported below 300 K in an unrestrained (8,8) CNT due to the large friction caused by severely deformed channel and the Brownian motion.
Graphene Oxide as Additive to Replace Using Air-Entraining Agents
Publisher: American Concrete Institute
Date: 12-2017
DOI: 10.14359/51700990
Effects of mineral admixtures and lime on disintegration of alkali-activated slag exposed to 50 °c
Publisher: Elsevier BV
Date: 11-2014
Exact solution for buckling of columns including self-weight
Publisher: American Society of Civil Engineers (ASCE)
Date: 2008
Incorporation of graphene oxide and silica fume into cement paste: A study of dispersion and compressive strength
Publisher: Elsevier BV
Date: 10-2016
Large set microstructure reconstruction mimicking quantum computing approach via deep learning
Publisher: Elsevier BV
Date: 05-2022
Mode i stress intensity factor of center-cracked tensile steel plates with CFRP reinforcement
Publisher: World Scientific Pub Co Pte Lt
Date: 02-2013
DOI: 10.1142/S0219455413500053
Abstract: Advanced carbon fiber reinforced polymer (CFRP) demonstrates promise for the fatigue strengthening of steel structures. By decreasing the stress field at the crack tip, the stress intensity factors (SIFs) can be effectively reduced by CFRP reinforcement. In this paper, the mode I SIF of CFRP-reinforced center-cracked tensile (CCT) steel plate is proposed based on a series of fatigue tests. The selected fatigue tests include experiments conducted by the authors as well as fatigue tests reported in the literature, covering different CFRP systems (low/high modulus, CFRP sheeting late) with various CFRP strengthening dimensions. The classical mode I SIF of CCT steel plate without CFRP strengthening is selected as the basis of the proposed solution. Then two reduction factors, similar to the correction factors given in the Japanese Society of Steel Construction (JSSC) standard, are introduced to study the effects of the mechanical properties of CFRP composites and the geometries of the CFRP reinforcement, respectively. Modified SIFs for both single-side CFRP-reinforced and double-side CFRP-reinforced CCT steel plates are proposed. It is found that the experimental SIFs of CFRP-reinforced CCT steel plates can be reasonably captured by the proposed mode I SIF formula. Finally, parametric studies for investigating the sensitivity of SIF to various mechanical and geometric factors are presented.
Effect of fatigue loading on the bond behaviour between UHM CFRP plates and steel plates
Publisher: Elsevier BV
Date: 07-2013
Snubbing effect in atomic scale friction of graphene
Publisher: Elsevier BV
Date: 03-2018
Graphene-based nanosheets for stronger and more durable concrete: A review
Publisher: Elsevier BV
Date: 09-2018
Molecular Dynamics Simulations of Graphene Pull-Out from Calcium Silicate Hydrate
Publisher: American Society of Civil Engineers
Date: 17-09-2015
Influence of Nanolimestone on the Hydration, Mechanical Strength, and Autogenous Shrinkage of Ultrahigh-Performance Concrete
Publisher: American Society of Civil Engineers (ASCE)
Date: 2016
The influences of admixtures on the dispersion, workability, and strength of carbon nanotube-OPC paste mixtures
Publisher: Elsevier BV
Date: 02-2012
Agglomeration process of surfactant-dispersed carbon nanotubes in unstable dispersion: A two-stage agglomeration model and experimental evidence
Publisher: Elsevier BV
Date: 11-2016
Mechanical properties and microstructure of a graphene oxide-cement composite
Publisher: Elsevier BV
Date: 04-2015
Exfoliation and dispersion of boron nitride nanosheets to enhance ordinary Portland cement paste
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C7NR07561H
Abstract: Exfoliation and dispersion of boron nitride nanosheets (BNNSs) is the key to achieving desired reinforcing effects for ordinary Portland cement (OPC).
Properties of one-part fly ash/slag-based binders activated by thermally-treated waste glass/NaOH blends: A comparative study
Publisher: Elsevier BV
Date: 09-2020
Effects of Ammonium Hydrolyzed Polyacrylonitrile on Oil-Well Cement Slurry
Publisher: American Society of Civil Engineers (ASCE)
Date: 09-2017
Experimental and numerical studies on impact behaviors of recycled aggregate concrete-filled steel tube after exposure to elevated temperature
Publisher: Elsevier BV
Date: 12-2017
Nonlinear bending and stretching of a circular graphene sheet under a central point load
Publisher: IOP Publishing
Date: 26-01-2009
DOI: 10.1088/0957-4484/20/7/075702
Abstract: Understanding of the bending and stretching properties of graphene is crucial in guiding its growth and applications. In this paper, we investigate the deformation of a single layer, circular, graphene sheet under a central point load by carrying out molecular mechanics (MM) simulations. The bending and stretching of the graphene sheet are characterized by using the von Kármán plate theory. Stress concentrations near the loaded region and the boundary due to bending rigidity of the graphene sheet are highlighted. It is shown herein that, with properly selected parameters, the von Kármán plate theory can provide a remarkably accurate prediction of the graphene sheet behavior under linear and nonlinear bending and stretching.
Wave Response of a Novel Breakwater Concept With Oscillating Water Columns
Publisher: American Society of Mechanical Engineers
Date: 09-06-2019
Abstract: A novel concept of a mega floating breakwater-windbreak is proposed for reducing both wave height and wind speed on its leeward side. L-shaped internal channels are installed inside the breakwater hull that surface from the floating breakwater as tubes that function like “trees” to break the wind. The channel openings are on the vertical walls at the upstream side of the breakwater, so that water is allowed to oscillate inside the channels and create extra viscous d ing. Numerical studies using both linear boundary element method and CFD were carried out to determine the wave transmissibility and wave force on the breakwater with and without the internal channels. The wave condition in the Gold Coast, Australia was selected as an environmental input. Operating wave condition and extreme wave condition were separately investigated. Scaled dimensions were used to study the breakwater behavior in a wave flume. The results show that when water oscillates inside the channels, the transmitted wave height and lateral wave force acting on the breakwater will be reduced. In addition, since the viscous effect influences waves of all lengths, the internal channels improves the breakwater performance in blocking long waves.
Graphene-based modification on the interface in fibre reinforced cementitious composites for improving both strength and toughness
Publisher: Elsevier BV
Date: 12-2020
Molecular simulation of water and chloride ion diffusion in nanopores of alkali-activated aluminosilicate structures
Publisher: Elsevier BV
Date: 12-2018
Integrally hydrophobic cementitious composites made with waste amorphous carbon powder
Publisher: Elsevier BV
Date: 02-2020
Nano reinforced cement and concrete composites and new perspective from graphene oxide
Publisher: Elsevier BV
Date: 12-2014
The properties of fly ash based geopolymer mortars made with dune sand
Publisher: Elsevier BV
Date: 02-2016
IMPROVED END BEARING CAPACITIES OF SHARP-CORNER ALUMINUM TUBULAR SECTIONS WITH CFRP STRENGTHENING
Publisher: World Scientific Pub Co Pte Lt
Date: 2012
DOI: 10.1142/S0219455412004616
Abstract: Web crippling is the major failure mode of thin-walled members when they are subjected to concentrated loading. Carbon fiber-reinforced polymer (CFRP) is found to be promising for strengthening metallic structural members. This paper reports improved web-crippling capacity of sharp-corner aluminum tubular sections: rectangular hollow section (RHS) and square hollow section (SHS), by attaching CFRP to their webs. Twenty four specimens were tested with four CFRP strengthening configurations applied on each of six different aluminum RHS and SHS sections. Significant increase in load-carrying capacity was obtained. Further comparison is made between CFRP strengthened aluminum tubular sections and cold-formed steel counterparts in respect of strengthening efficiency. Underlying mechanism of different failure modes and strengthening efficiencies of various strengthening configurations are discussed with the assistance of FEM simulation.
Design of GFRP-reinforced rectangular concrete columns under eccentric axial loading
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.
Synthesis of microcrystalline brownmillerite Ca2(Al,Fe)2O5and its influence of mechanical properties to the class G oil-well cement
Publisher: Informa UK Limited
Date: 18-07-2017
Direct Observation of 2D Electrostatics and Ohmic Contacts in Template-Grown Graphene/WS2 Heterostructures
Publisher: American Chemical Society (ACS)
Date: 27-02-2017
Early-age shrinkage development of ultra-high-performance concrete under heat curing treatment
Publisher: Elsevier BV
Date: 2017
BUCKLING BEHAVIOR OF SHORT MULTI-WALLED CARBON NANOTUBES UNDER AXIAL COMPRESSION LOADS
Publisher: World Scientific Pub Co Pte Lt
Date: 12-2012
DOI: 10.1142/S0219455412500459
Abstract: We investigate the buckling behaviors of short multi-walled carbon nanotubes (MWCNTs) under axial compression by using molecular mechanics (MM) simulations. The effects of the number of walls, length and chiral angle of MWCNTs on the buckling behaviors are examined. The results show that the buckling behaviors of short MWCNTs are rather different from single walled carbon nanotubes (SWCNTs) and slender MWCNTs. Moreover, it is observed that the buckling strains of short MWCNTs vary inversely proportional to the number of nanotube walls. For slender MWCNTs, the buckling strains fluctuate as the number of walls increase. It increases for beam-like buckling mode, decreases for shell-like buckling mode and is approximately constant for the shell-beam-like buckling mode. The increase in the length of MWCNT has also led to a significant decrease of the buckling strain for short MWCNTs. However, chirality does not have a significant effect on the buckling strain of MWCNTs nor alter the buckling mode of short MWCNTs.
Effect of Graphene Oxide on the Pore Structure of Cement Paste: Implications for Performance Enhancement
Publisher: American Chemical Society (ACS)
Date: 13-10-2021
Fatigue tests on steel plates with longitudinal weld attachment strengthened by ultra high modulus carbon fibre reinforced polymer plate
Publisher: Wiley
Date: 11-05-2013
DOI: 10.1111/FFE.12067
Design rules for web crippling of CFRP strengthened aluminium rectangular hollow sections
Publisher: Elsevier BV
Date: 10-2011
Effects of Nanoalumina and Graphene Oxide on Early-Age Hydration and Mechanical Properties of Cement Paste
Publisher: American Society of Civil Engineers (ASCE)
Date: 09-2017
Effect of ultrasonication energy on engineering properties of carbon nanotube reinforced cement pastes
Publisher: Elsevier BV
Date: 04-2015
Failure of CFRP-to-steel double strap joint bonded using carbon nanotubes modified epoxy adhesive at moderately elevated temperatures
Publisher: Elsevier BV
Date: 06-2016
Assessment of continuum mechanics models in predicting buckling strains of single-walled carbon nanotubes
Publisher: IOP Publishing
Date: 02-09-2009
DOI: 10.1088/0957-4484/20/39/395707
Abstract: This paper presents an assessment of continuum mechanics (beam and cylindrical shell) models in the prediction of critical buckling strains of axially loaded single-walled carbon nanotubes (SWCNTs). Molecular dynamics (MD) simulation results for SWCNTs with various aspect (length-to-diameter) ratios and diameters will be used as the reference solutions for this assessment exercise. From MD simulations, two distinct buckling modes are observed, i.e. the shell-type buckling mode, when the aspect ratios are small, and the beam-type mode, when the aspect ratios are large. For moderate aspect ratios, the SWCNTs buckle in a mixed beam-shell mode. Therefore one chooses either the beam or the shell model depending on the aspect ratio of the carbon nanotubes (CNTs). It will be shown herein that for SWCNTs with long aspect ratios, the local Euler beam results are comparable to MD simulation results carried out at room temperature. However, when the SWCNTs have moderate aspect ratios, it is necessary to use the more refined nonlocal beam theory or the Timoshenko beam model for a better prediction of the critical strain. For short SWCNTs with large diameters, the nonlocal shell model with the appropriate small length scale parameter can provide critical strains that are in good agreement with MD results. However, for short SWCNTs with small diameters, more work has to be done to refine the nonlocal cylindrical shell model for better prediction of critical strains.
Effects of graphene oxide agglomerates on workability, hydration, microstructure and compressive strength of cement paste
Publisher: Elsevier BV
Date: 08-2017
Calibration of nonlocal scaling effect parameter for free vibration of carbon nanotubes by molecular dynamics
Publisher: AIP Publishing
Date: 15-01-2007
DOI: 10.1063/1.2423140
Abstract: In this paper, the small scaling parameter e0 of the nonlocal Timoshenko beam theory is calibrated for the free vibration problem of single-walled carbon nanotubes (SWCNTs). The calibration exercise is performed by using vibration frequencies generated from molecular dynamics simulations at room temperature. It was found that the calibrated values of e0 are rather different from published values of e0. Instead of a constant value, the calibrated e0 values vary with respect to length-to-diameter ratios, mode shapes, and boundary conditions of the SWCNTs. In addition, the physical meaning of the scaling parameter is explored. The results show that scaling parameter assists in converting the kinetic energy to the strain energy, thus enabling the kinetic energy to be equal to the strain energy. The calibrated e0 presented herein should be useful for researchers who are using the nonlocal beam theories for analysis of micro and nano beams/rods/tubes.
Predicting the influence of ultrasonication energy on the reinforcing efficiency of carbon nanotubes
Publisher: Elsevier BV
Date: 10-2014
Controlling the rheological properties of cement for a submillimetre-thin shell structure
Publisher: Springer Science and Business Media LLC
Date: 29-06-2021
Dynamic responses of bridge–embankment transitions in high speed railway: Field tests and data analyses
Publisher: Elsevier BV
Date: 11-2018
Investigation on dispersion of graphene oxide in cement composite using different surfactant treatments
Publisher: Elsevier BV
Date: 02-2018
Reinforcement effects of polyvinyl alcohol and polypropylene fibers on flexural behaviors of sulfoaluminate cement matrices
Publisher: Elsevier BV
Date: 04-2018
Reliable Synthesis of Large‐Area Monolayer WS2 Single Crystals, Films, and Heterostructures with Extraordinary Photoluminescence Induced by Water Intercalation
Publisher: Wiley
Date: 22-03-2018
Loading-rate-dependent effects of colloidal nanosilica on the mechanical properties of cement composites
Publisher: Elsevier BV
Date: 08-2022
Corrigendum to “Effects of graphene oxide agglomerates on workability, hydration, microstructure and compressive strength of cement paste” [Constr. Build. Mater. 145 (2017) 402–410]
Publisher: Elsevier BV
Date: 08-2018
Quantitative microstructural characterisation of Portland cement‑carbon nanotube composites using electron and x-ray microscopy
Publisher: Elsevier BV
Date: 09-2019
Effect of very fine particles on workability and strength of concrete made with dune sand
Publisher: Elsevier BV
Date: 10-2013
FEM Simulation of Ocarina-Shaped Piezoelectric Wind Energy Harvester
Publisher: Springer Singapore
Date: 04-09-2019
Reinforcing brittle and ductile epoxy matrices using carbon nanotubes masterbatch
Publisher: Elsevier BV
Date: 06-2014
Review of recent research and developments on floating breakwaters
Publisher: Elsevier BV
Date: 06-2018
Collision of a suddenly released bent carbon nanotube with a circular graphene sheet
Publisher: AIP Publishing
Date: 04-2010
DOI: 10.1063/1.3330754
Abstract: Molecular dynamics (MD) simulations were used to investigate the mechanical strain energy release of a bent single wall carbon nanotube (CNT) and its mechanical collision with a circular graphene sheet that is fixed at its edges. The MD simulations show that the CNT is able to store a vast amount of mechanical strain energy because of the formation of kinks on its wall at the regions of maximum curvature. The sudden release of the strain energy upon releasing the bent CNT can cause its tip to approach a speed of 7000 m/s. Even with such a high speed collision with a monolayer graphene sheet, the CNT and the monolayer graphene sheet remain completely intact and do not suffer any damage. The instantaneous average impact pressure between the CNT and the graphene sheet is calculated to be in the range of 1–10 GPa for different temperatures and aspect ratios of the CNT. These results indicate the promising application of a CNT and a graphene sheet as a nanoknife and a nanocutting board, respectively, for nanocleavage processes such as sequence-specific DNA cleaving processes.
Reinforcing mechanism of graphene at atomic level: Friction, crack surface adhesion and 2D geometry
Publisher: Elsevier BV
Date: 04-2017
Fatigue tests of cracked steel plates strengthened with UHM CFRP plates
Publisher: SAGE Publications
Date: 10-2012
DOI: 10.1260/1369-4332.15.10.1801
Abstract: Carbon fibre reinforced polymer ( CFRP) has shown promise for improving the fatigue performance of steel structures. Previous studies have indicated that increasing the Young's modulus of CFRP can be beneficial for decreasing the stress intensity factor at the fatigue crack tip. In this project, ultra high modulus (UHM) CFRP plates with Young's modulus of 460 GPa were adopted to study their fatigue repair effectiveness. A series of fatigue tension tests was carried out on steel plates with an initial crack in the centre. Five strengthening configurations were used and a constant litude fatigue loading was applied to all the specimens. The beach marking technique was utilized to record the fatigue crack propagation. The effects of CFRP bond length, bond width and bond locations on the fatigue performance of cracked steel plates were also studied. The experimental results show that UHM CFRP plates can greatly increase the fatigue life of cracked steel plates by a factor ranging from 3.26 to 7.47. When CFRP plates cover the whole crack surface, the fatigue crack of the steel plate is arrested. The strengthening effectiveness of UHM CFRP plates is also compared with those using high Young's modulus CFRP sheeting and normal Young's modulus CFRP plates with or without prestressing.
Graphene Oxide-Based Mesoporous Calcium Silicate Hydrate Sandwich-like Structure: Synthesis and Application for Thermal Energy Storage
Publisher: American Chemical Society (ACS)
Date: 04-01-2022
Improvement of mechanical properties by incorporating graphene oxide into cement mortar
Publisher: Informa UK Limited
Date: 03-01-2017
Exact solutions for axisymmetric bending of micro/nanoscale circular plates based on nonlocal plate theory
Publisher: IOP Publishing
Date: 31-08-2007
Mechanical behavior of recycled aggregate concrete-filled steel tube stub columns after exposure to elevated temperatures
Publisher: Elsevier BV
Date: 08-2017
Toward the Understanding of Stress-Induced Mineral Dissolution via Molecular Scale Simulations
Publisher: American Chemical Society (ACS)
Date: 07-08-2020
Effects of nanoparticle on the dynamic behaviors of recycled aggregate concrete under impact loading
Publisher: Elsevier BV
Date: 12-2016
ZnO enhanced NiO-based gas sensors towards ethanol
Publisher: Elsevier BV
Date: 06-2017
On boundary conditions for buckling and vibration of nonlocal beams
Publisher: Elsevier BV
Date: 2017
Towards microstructure-based analysis and design for seepage water in underground engineering: Effect of image characteristics
Publisher: Elsevier BV
Date: 11-2019
Tunable wrinkling pattern in annular graphene under circular shearing at inner edge
Publisher: Royal Society of Chemistry (RSC)
Date: 2012
DOI: 10.1039/C2NR31059G
Abstract: This work is concerned with the wrinkling phenomenon observed in an annular graphene sheet under circular shearing at its inner edge. By performing molecular mechanics simulations on the aforementioned loaded annular graphene sheet, it is observed that the unusual wrinkles formed are confined to within an annulus that hugs the perimeter of the inner radius. This confined wrinkling pattern is in contrast to the wrinkling patterns that spread throughout rectangular graphene sheets under tension or shear. The present wrinkling pattern is characterized by a wave number and wrinkle profile. The wave number at the bifurcation wrinkle is found to depend only on the inner radius of the annular graphene and it increases almost linearly with increasing inner radius. The orientation of these developed waves is found to be at a constant angle and independent from the radii ratio of annular graphene. The wrinkle profile in terms of wave litude and wavelength depends on the magnitude of the circular shearing. The predictable formation of wrinkles in annular graphene can be exploited for applications in nano-force sensors, tunable magnetic or electronic devices, as well as patterned stretchable electronics.
Dispersion of graphene oxide agglomerates in cement paste and its effects on electrical resistivity and flexural strength
Publisher: Elsevier BV
Date: 09-2018
Reinforcing effects of graphene oxide on portland cement paste
Publisher: American Society of Civil Engineers (ASCE)
Date: 02-2015
Floating Forest: A Novel Concept of Floating Breakwater-Windbreak Structure
Publisher: Springer Singapore
Date: 18-07-2019
New approach for characterisation of mechanical properties of cement paste at micrometre scale
Publisher: Elsevier BV
Date: 12-2015
Damping and microstructure of fly ash-based geopolymers
Publisher: Springer Science and Business Media LLC
Date: 21-12-2013
Role of Multiwalled Carbon Nanotubes as Shear Reinforcing Nanopins in Quasi-Brittle Matrices
Publisher: American Chemical Society (ACS)
Date: 06-04-2018
Development of analytical vibration solutions for microstructured beam model to calibrate length scale coefficient in nonlocal Timoshenko beams
Publisher: AIP Publishing
Date: 13-09-2013
DOI: 10.1063/1.4820565
Abstract: The present study takes an analytical approach for solving the free vibration problem of a microstructured beam model, in which transverse displacement springs are added to allow for the transverse shear deformation effect in addition to the rotational springs. The exact vibration frequencies for the discrete microstructured beam model with simply supported ends are obtained via matrix decomposition. In addition, a general solution technique involving the use of Padé approximants for the continualization procedure is proposed in order to obtain the continuous equivalent system for the discrete microstructured beam model. The analytical vibration solutions of the equivalent continuous system are obtained and their accuracy is assessed by using the exact solutions. It is found that the solutions of the equivalent continuous system have a first order accuracy when compared with the exact solutions of their discrete counterpart. The length scale coefficient in the nonlocal Timoshenko beam model is calibrated by using the analytical solutions. Two nonlocal Timoshenko beam models, i.e., the Wang model (without the length scale effect in the shear stress strain relation) and the Reddy model, are evaluated based on their ability to capture the nonlocal effect.
Development of granular expanded perlite/paraffin phase change material composites and prevention of leakage
Publisher: Elsevier BV
Date: 11-2016
Incorporating graphene oxide in cement composites: A study of transport properties
Publisher: Elsevier BV
Date: 06-2015
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