Influence of curing temperature on autogenous shrinkage and cracking resistance of high-performance concrete at an early age

Shen, Dejian; Jiang, Jinliang; Shen, Jiaxin; Yao, Panpan; Jiang, Guoqing

doi:10.1016/j.conbuildmat.2015.11.039

Cited by 128 publications

(45 citation statements)

References 28 publications

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“…First, the capillary water is consumed, followed by a reaction of the cement with the more strongly bound gel water [17]. The microstructure densifies and this leads to reaction products which take up a smaller volume than the initial reactants and a lack of external water to fill up the voids, resulting in self-desiccation of the cementitious matrix and hence, shrinkage and cracks [16,18,19,20]. Plastic shrinkage occurs when the surface moisture can evaporate faster instead of being replaced by internal water, which causes the surface to shrink more compared to the bulk material.…”

Section: Concrete and Its Problemsmentioning

confidence: 99%

Crack Mitigation in Concrete: Superabsorbent Polymers as Key to Success?

et al. 2017

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Cracking is a major concern in building applications. Cracks may arise from shrinkage, freeze/thawing and/or structural stresses, amongst others. Several solutions can be found but superabsorbent polymers (SAPs) seem to be interesting to counteract these problems. At an early age, the absorbed water by the SAPs may be used to mitigate autogenous and plastic shrinkage. The formed macro pores may increase the freeze/thaw resistance. The swelling upon water ingress may seal a crack from intruding fluids and may regain the overall water-tightness. The latter water may promote autogenous healing. The use of superabsorbent polymers is thus very interesting. This review paper summarizes the current research and gives a critical note towards the use of superabsorbent polymers in cementitious materials.

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Section: Concrete and Its Problemsmentioning

confidence: 99%

Crack Mitigation in Concrete: Superabsorbent Polymers as Key to Success?

et al. 2017

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“…Restriction of specimens was shown schematically in Figure . The constraint degree R is calculated from Equation ,

R = ((), 1 - \frac{ε_{f}}{ε_{r}}) \times 100 %,

…”

Section: Resultsmentioning

confidence: 99%

Study on the deterioration process of cement‐based materials under sulfate attack and drying–wetting cycles

Chen

Huang

Qian

2017

Structural Concrete

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In this paper, the deterioration process of mortars degraded by sulfate under the restricted and unconstrained condition was investigated, respectively. Sodium sulfate (5 wt%) and dry–wet circulation method was adopted to accelerate the deterioration process. The deformation, damage rate, and porosity were measured by linear variable differential transducers (LVDTs), ultrasonic velocity measuring technology, and X‐ray computed tomography (XCT), respectively. Mass loss and loss rates of flexural strength and compressive strength were also measured to evaluate the deterioration results. Scanning electron microscope (SEM), energy‐dispersive Spectrometer (EDS), and X‐ray diffraction (XRD) were used to analyze the degradation mechanisms. The experimental results indicate that the greater the water–cement (w/c) ratio of mortars, the more serious the deterioration. XCT images and analysis results of porosities show that, among the mortars after being degraded by sulfate solution for 360 drying–wetting cycles, the M30‐SR sample under restricted condition is deteriorated most seriously. SEM/EDS and XRD analysis results indicate that the microstructure of hydration products changed obviously. Sodium sulfate and gypsum are observed after being degraded by sodium sulfate.

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“…The testing arrangement 87 is versatile and can be used not only for restrained shrinkage (both bulk drying and autogenous), including determination of the gradually increasing stress induced by restraint and cracking age, but also for classical creep tests under sustained tensile load, and finally can be used for conducting uniaxial tensile strength tests at different ages, which provide the important information about the stress/strength ratios as a function of time; it was and still is considered to be amongst the most advanced and reliable. This testing rig, alongside with the analytical interpretation of its results, served as the basis for several investigations on fibre‐reinforced and high‐performance concrete conducted by its conceptor 93–96 but also adopted by other researchers in numerous studies investigating creep, shrinkage and thermal effects in cementitious systems 89–92,97–112 . As the above described testing system mainly allows for the effects of restrained linear shrinkage to be examined, the traditional TSTM has been recently modified and improved by numerous researchers, in order to enable thermally insulated and regulated concrete specimens to be examined.…”

Section: State Of the Art Review Of Longitudinal Testing Devicesmentioning

confidence: 99%

Longitudinal restraining devices for the evaluation of structural behaviour of cement‐based materials: The past, present and prospective trends

Kanavaris

Azenha

Schlicke

et al. 2020

Strain

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The problem of thermal and shrinkage cracking in concrete has been long recognised by researchers and engineers as it can jeopardise the intended serviceability of a concrete structure. This has led researchers to develop testing devices which aim to simulate the behaviour of concrete under restrained deformations. Such devices are discerned in passive and active, depending on how concrete's movement is restrained, whilst a new type of devices has been developed to account for the combined effects of intrinsic restrained deformations and externally imposed actions. This paper presents a detailed and critical literature review on the developed restraining devices and an analysis of the capabilities, complexities and peculiarities associated with their use. Further to this, the challenges the developers of testing devices are faced with, the gaps and uncertainties with the methods found in the literature and recommendations for potential improvements in the field are discussed. K E Y W O R D Screep and shrinkage, heat of hydration, restraining devices, restraint, shrinkage cracking, thermal cracking, viscoelasticity

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Influence of curing temperature on autogenous shrinkage and cracking resistance of high-performance concrete at an early age

Cited by 128 publications

References 28 publications

Crack Mitigation in Concrete: Superabsorbent Polymers as Key to Success?

Crack Mitigation in Concrete: Superabsorbent Polymers as Key to Success?

Study on the deterioration process of cement‐based materials under sulfate attack and drying–wetting cycles

Longitudinal restraining devices for the evaluation of structural behaviour of cement‐based materials: The past, present and prospective trends

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