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

Dabarera, Arosha; Li, Liang; Lura, Pietro; Dao, Vinh

doi:10.1016/j.conbuildmat.2021.126125

Cited by 9 publications

(3 citation statements)

References 34 publications

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“…where E(t) is the elastic modulus, b(t) is an aging coefficient (of between 0.6 and 1.0) [16], and u(t) is the creep coefficient. According to the authors' research in [17,18], u(t) of early-age concrete can be approximated using a revised MC2010 creep model. Although Eq.…”

Section: Theoretical Basismentioning

confidence: 99%

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

Dabarera

Dao

2022

Mater Struct

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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 (Tz) and cracking temperature (Tx) are crucial. In this study, the two temperatures are investigated in-depth by both theoretical analysis and experimental studies. For predicting the evolutions of Tz and Tx 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 Tz and Tx 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 Tz and Tx to properly maintain the stress induced by restrained strain in compression at early ages. If T becomes lower than Tz 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 Tx, cracking is highly likely to occur. For a given actual temperature condition, lowering Tz and Tx can mitigate the risk of the cracking of concrete. Finally, effective measures for such lowering of Tz and Tx are also proposed.

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Section: Theoretical Basismentioning

confidence: 99%

“…Following the authors' previous studies [5,10,17,29], a concrete mix with water-to-binder ratio (w/b) of 0.25 (see Table 1) was studied to demonstrate the determination and evolution of T z and T x profiles in this paper.…”

Section: Concrete MIXmentioning

confidence: 99%

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

Dabarera

Dao

2022

Mater Struct

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“…The effective modulus method was reported to be only suitable for non-ageing concrete subjected to constant stress history; therefore, it has rather limited applicability in practice [ 27 ]. The age-adjusted and Trost–Bazant model parameters were calibrated by tests on mature concrete, thus the suitability of the above models for predicting tensile creep was questioned early on when concrete properties changed rapidly with time [ 30 , 31 ]. In terms of obtaining the elastic modulus of concrete,

was measured by the method recommended by the “Standard for test methods of concrete physical and mechanical properties” [ 32 ].…”

Section: Introductionmentioning

confidence: 99%

Concrete Elastic Modulus Experimental Research Based on Theory of Capillary Tension

Zhou

et al. 2022

Materials

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The risk of cracking in the early stage is a critical indicator of the performance of concrete structures. Concrete cracked when the tensile stresses caused by deformation under restraint conditions exceeded its tensile strength. This research aims at an accurate prediction of shrinkage cracking of concrete under constraints. Based on the theory of capillary tension under the concrete shrinkage mechanism, the method to test and compute the elastic modulus of a micro-matrix around the capillary, Et, was derived. Shrinkage and porosity determination tests were conducted to obtain the shrinkage values and confining stresses of concrete at different strength grades, different ages and under different restraint conditions, accordingly. Meanwhile, the proposed method of this research was used to obtain Et. The restraint stress given by Et was compared with the experimental result under the corresponding time. The results suggested a positive correlation between the elastic modulus of a micro-matrix around the capillary, Et, precomputed by the theory, and the static elastic modulus, Ec, and that the ratio between the two gradually decreased with the passage of time, which ranged from 2.8 to 3.1.

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Assessing Early-age Dynamic Elastic Modulus in High-Performance Concrete

Dabarera,

Li,

Jamwal

et al. 2023

RILEM Bookseries

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

Cited by 9 publications

References 34 publications

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

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

Concrete Elastic Modulus Experimental Research Based on Theory of Capillary Tension

Assessing Early-age Dynamic Elastic Modulus in High-Performance Concrete

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