Vinh Dao

Experimental assessment and modelling of effective tensile elastic modulus in high performance concrete at early age

Publisher: Elsevier BV

Date: 02-2022

DOI: 10.1016/J.CONBUILDMAT.2021.126125

Evolution of Coefficient of Thermal Expansion of Concrete at Early Ages

Publisher: Springer Singapore

Date: 04-09-2020

DOI: 10.1007/978-981-13-7603-0_30

Time-zero and deformational characteristics of high performance concrete with and without superabsorbent polymers at early ages

Publisher: Elsevier BV

Date: 12-2020

DOI: 10.1016/J.CONBUILDMAT.2020.120262

Evaluation of sealants to mitigate the release of per- and polyfluoroalkyl substances (PFAS) from AFFF-impacted concrete: Characterization and forecasting

Publisher: Elsevier BV

Date: 09-2023

DOI: 10.1016/J.WROA.2023.100195

Tensile properties of concrete at very early ages

Publisher: Elsevier BV

Date: 03-2017

DOI: 10.1016/J.CONBUILDMAT.2016.12.169

Hydration properties and thermal analysis of cement-based materials containing limestone powder

Publisher: Springer Science and Business Media LLC

Date: 12-2017

DOI: 10.1007/S11771-017-3707-2

Experimental evaluation and modelling of early-age basic tensile creep in high-performance concrete

Publisher: Springer Science and Business Media LLC

Date: 06-2021

DOI: 10.1617/S11527-021-01722-W

Experimental study into the behaviour of profiled composite walls under combined axial and thermal loadings

Publisher: Elsevier BV

Date: 05-2020

DOI: 10.1016/J.ENGSTRUCT.2020.110354

Crack propagation in concrete at very early ages

Publisher: Thomas Telford Ltd.

Date: 07-2014

DOI: 10.1680/MACR.13.00205

Abstract: Surface defects and cracks in early-age concrete slabs have been observed to propagate under adverse conditions, impairing the performance and service life of these structures. However, the underlying mechanism of this form of crack propagation has remained largely unexplained, with very limited literature available. In this paper, simple yet sufficiently rigorous theoretical analyses of crack propagation in early-age concrete slabs, based on combined geotechnical engineering and fracture mechanics models, are presented. The results obtained clearly show how surface cracks can become unstable and propagate further, and either become stable again or develop through the full depth of the slab. They also convincingly demonstrate the roles of surface cracks and defects, pore moisture suctions and exposure conditions in this process. Importantly, the critical role of good construction practices in minimising this form of cracking is highlighted. These include proper compaction and effective curing as well as timely and adequate saw-cutting.

Evaluation of zero-stress temperature and cracking temperature of high performance concrete at early ages

Publisher: Springer Science and Business Media LLC

Date: 19-08-2022

DOI: 10.1617/S11527-022-02019-2

Abstract: Assessing the risk of cracking of high performance concrete induced by restrained volume changes from early ages is of considerable significance. To estimate and control such cracking risk of high performance concrete, two characteristic temperatures, namely zero-stress temperature ( T z ) and cracking temperature ( T x ) are crucial. In this study, the two temperatures are investigated in-depth by both theoretical analysis and experimental studies. For predicting the evolutions of T z and T x from early ages, rigorous yet practical models are proposed, which crucially take the visco-elastic behaviour of concrete into account. The reliability and predictive capability of the proposed models are demonstrated through a series of comparisons between the predicted and the measured results. Based on the predicted T z and T x profiles, practical thermal control criteria for preventing concrete from cracking caused by restrained strain are put forward. In principle, the actual temperature ( T ) of concrete should be kept higher than both T z and T x to properly maintain the stress induced by restrained strain in compression at early ages. If T becomes lower than T z and reduces continuously, the lower the value of T , the higher the risk of cracking of concrete induced by restrained strain. As a consequence, once the value of T reaches or becomes lower than T x , cracking is highly likely to occur. For a given actual temperature condition, lowering T z and T x can mitigate the risk of the cracking of concrete. Finally, effective measures for such lowering of T z and T x are also proposed.

Dimensional change of cement paste subjected to carbonation in CO2 sequestration and utilization context: A critical review on the mechanisms

Publisher: Elsevier BV

Date: 04-2023

DOI: 10.1016/J.JCOU.2023.102444

Basic tensile creep of concrete with and without superabsorbent polymers at early ages

Publisher: Elsevier BV

Date: 02-2022

DOI: 10.1016/J.CONBUILDMAT.2021.126180

A novel approach to estimate the evolution of fracture energy and tensile softening curve of concrete from very early age

Publisher: Elsevier BV

Date: 06-2018

DOI: 10.1016/J.ENGFRACMECH.2018.02.026

Understanding the effects of stress on the coefficient of thermal expansion

Publisher: Elsevier BV

Date: 08-2019

DOI: 10.1016/J.IJENGSCI.2019.05.016

Effect of Radiofrequency Denervation on Pain Intensity Among Patients With Chronic Low Back Pain

Publisher: American Medical Association (AMA)

Date: 04-07-2017

DOI: 10.1001/JAMA.2017.7918

Thermal Cracking Analysis during Pipe Cooling of Mass Concrete Using Particle Flow Code

Publisher: Hindawi Limited

Date: 2016

DOI: 10.1155/2016/5976862

Abstract: Pipe cooling systems are among the potentially effective measures to control the temperature of mass concrete. However, if not properly controlled, thermal cracking in concrete, especially near water pipes, might occur, as experienced in many mass concrete structures. In this paper, a new numerical approach to simulate thermal cracking based on particle flow code is used to shed more light onto the process of thermal crack propagation and the effect of thermal cracks on thermal fields. Key details of the simulation, including the procedure of obtaining thermal and mechanical properties of particles, are presented. Importantly, a heat flow boundary based on an analytical solution is proposed and used in particle flow code in two dimensions to simulate the effect of pipe cooling. The simulation results are in good agreement with the monitored temperature data and observations on cored specimens from a real concrete gravity dam, giving confidence to the appropriateness of the adopted simulation. The simulated results also clearly demonstrate why thermal cracks occur and how they propagate, as well as the influence of such cracks on thermal fields.

Deformation capturing of concrete structures at elevated temperatures

Publisher: Elsevier BV

Date: 2017

DOI: 10.1016/J.PROENG.2017.11.121

Plastic shrinkage cracking of concrete - Roles of osmotic suction

Publisher: Thomas Telford Ltd.

Date: 10-2011

DOI: 10.1680/MACR.2011.63.10.743

Abstract: Plastic shrinkage cracking of concrete occurs when the stresses arising in the concrete, due to a combination of suction and restraints of deformation such as reinforcement or formwork, equal its strength. However, three different types of suctions should be distinguished, namely total, matric and osmotic suctions. Although the total suction comprises matric and osmotic suctions, it is often used interchangeably with matric suction, with the underlying unconfirmed assumption that either the osmotic suction or its effect is negligible. In this paper, after a discussion of the pore moisture suctions and strength of unsaturated early-age concrete, experimental investigations of the suctions arising in, and the tensile strength and shear strength of, fly ash mixed with solutions of different osmotic suctions are described. It was found that osmotic suction has negligible effect on the shear and tensile strength, and hence, by inference, the inter-particle stresses in the fly ash mixture and early-age concrete. This strongly suggests that the role played by osmotic suction in the plastic shrinkage cracking of concrete is minimal and, accordingly, justifies the focus of earlier researchers on matric suction only.

Stress–strain–temperature relationship for concrete

Publisher: Elsevier BV

Date: 03-2021

DOI: 10.1016/J.FIRESAF.2020.103126

Understanding the performance of profiled composite walls in fire

Publisher: Elsevier BV

Date: 05-2023

DOI: 10.1016/J.ENGSTRUCT.2023.115790

Temperature and stress in concrete cylinder specimen subject to uniform heat flux: a numerical solution

Publisher: School of Civil Engineering, The University of Queensland

Date: 2015

DOI: 10.14264/UQL.2016.407

Effects of micro-fibres on early-age properties of concrete

Publisher: School of Civil Engineering, The University of Queensland

Date: 2015

DOI: 10.14264/UQL.2016.406

Temperature-stress testing machine - A state-of-the-art design and its unique applications in concrete research

Publisher: Elsevier BV

Date: 09-2019

DOI: 10.1016/J.CEMCONCOMP.2019.04.019

Assessing the zero-stress temperature in high performance concrete at early age

Publisher: Elsevier BV

Date: 03-2022

DOI: 10.1016/J.CEMCONCOMP.2021.104384

Effects of temperature and temperature gradient on concrete performance at elevated temperatures

Publisher: SAGE Publications

Date: 08-12-2017

DOI: 10.1177/1369433217746347

Abstract: To assure adequate fire performance of concrete structures, appropriate knowledge of and models for performance of concrete at elevated temperatures are crucial yet currently lacking, prompting further research. This article first highlights the limitations of inconsistent thermal boundary conditions in conventional fire testing and of using constitutive models developed based on empirical data obtained through testing concrete under minimised temperature gradients in modelling of concrete structures with significant temperature gradients. On that basis, this article outlines key features of a new test setup using radiant panels to ensure well-defined and reproducible thermal and mechanical loadings on concrete specimens. The good repeatability, consistency and uniformity of the thermal boundary conditions are demonstrated using measurements of heat flux and in-depth temperature of test specimens. The initial collected data appear to indicate that the compressive strength and failure mode of test specimens are influenced by both temperature and temperature gradient. More research is thus required to further quantify such effect and also to effectively account for it in rational performance-based fire design and analysis of concrete structures. The new test setup reported in this article, which enables reliable thermal/mechanical loadings and deformation capturing of concrete surface at elevated temperatures using digital image correlation, would be highly beneficial for such further research.

Autogenous deformation and coefficient of thermal expansion of early-age concrete: Initial outcomes of a study using a newly-developed Temperature Stress Testing Machine

Publisher: Elsevier BV

Date: 05-2021

DOI: 10.1016/J.CEMCONCOMP.2021.103997

On equations for the total suction and its matric and osmotic components

Publisher: Elsevier BV

Date: 11-2008

DOI: 10.1016/J.CEMCONRES.2008.06.004

Application of digital image correlation system for reliable deformation measurement of concrete structures at high temperatures

Publisher: Elsevier BV

Date: 08-2019

DOI: 10.1016/J.ENGSTRUCT.2019.05.009

University Of Queensland

Location: Australia

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The University Of Danang

Location: Viet Nam

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James Cook University

Location: Australia

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Performance Level Structural Testing Facility

Start Date: 2013

End Date: 2013

Funder: Australian Research Council

Discovery Projects - Grant ID: DP220103362

Start Date: 04-2022

End Date: 04-2025

Amount: $224,000.00

Funder: Australian Research Council

Linkage Projects - Grant ID: LP140100504

Start Date: 08-2015

End Date: 12-2019

Amount: $600,000.00

Funder: Australian Research Council

Discovery Projects - Grant ID: DP180103160

Start Date: 2018

End Date: 12-2024

Amount: $241,590.00

Funder: Australian Research Council

Linkage Infrastructure, Equipment And Facilities - Grant ID: LE220100030

Start Date: 09-2022

End Date: 12-2023

Amount: $1,213,351.00

Funder: Australian Research Council

Discovery Projects - Grant ID: DP150102354

Start Date: 2015

End Date: 12-2019

Amount: $286,300.00

Funder: Australian Research Council

Linkage Infrastructure, Equipment And Facilities - Grant ID: LE130100089

Start Date: 2013

End Date: 07-2014

Amount: $500,000.00

Funder: Australian Research Council

Linkage Infrastructure, Equipment And Facilities - Grant ID: LE170100079

Start Date: 2017

End Date: 12-2017

Amount: $267,000.00

Funder: Australian Research Council

Linkage Infrastructure, Equipment And Facilities - Grant ID: LE170100168

Start Date: 2017

End Date: 12-2019

Amount: $458,000.00

Funder: Australian Research Council