Representative volume element estimation for desorption isotherm of concrete with sliced samples

Wu, Qier; Rougelot, Thomas; Burlion, Nicolas; Bourbon, Xavier

doi:10.1016/j.cemconres.2015.05.010

Cited by 17 publications

(7 citation statements)

References 44 publications

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“…The mass of sample was weighed periodically, and its relationship with the drying age was plotted, as shown in Figure 2. The mass curve coincides with that reported elsewhere [30], where the mass of the sample reduced rapidly during the first month, while it tended to be constant after two months of balancing. After being conditioned in the environmental chamber for three months, four side faces (two 40 × 40 mm 2 , two 40 × 2 mm 2 ) were covered by epoxy resin, and the left two faces (40 × 2 mm 2 ) were used for 1D accelerated carbonation (see Figure 1).…”

Section: Preconditioning and Accelerated Carbonation Testsupporting

confidence: 89%

“…The mass of sample was weighed periodically, and its relationship with the drying age was plotted, as shown in Figure 2. The mass curve coincides with that reported elsewhere [30], where the mass of the sample reduced rapidly during the first month, while it tended to be constant after two months of balancing. It should be mentioned here that the sliced sample was adopted in this study with the aim of generating a plane crack system.…”

Section: Preconditioning and Accelerated Carbonation Testsupporting

confidence: 89%

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Tomography-Based Investigation on the Carbonation Behavior through the Surface-Opening Cracks of Sliced Paste Specimen

et al. 2020

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Understanding the cracking behavior during carbonation is of high importance, and the cracks can serve as a shortcut for CO2 diffusion, which can further accelerate the carbonation process itself. In this study, a sliced paste sample was taken for an accelerated carbonation test, and the cracking behavior, as well as its impact on carbonation, was investigated through a novel extended attenuation method based on X-ray (XRAM) which is performed primarily on computed tomography (CT). Surface-opening cracks at different carbonation ages were rendered, based on which a full view on the carbonation-cracking behavior was built. The results reveal that the crack paths can rapidly be occupied by CO2, and that leads to the generation of V-shaped carbonation cusps pervading the carbonation fronts. The V-shaped carbonation cusps were mostly generated at the early carbonation age (within 14 days), attesting to a less intact sample surface as compared to the inside area. Moreover, this study confirms that the carbonated area would split into two independent zones with variant carbonation degree due to the increased humidity level near the sample surface. The current work reveals the interconnection between carbonation and cracking, and the results can be used for the designing of cement-based materials with better carbonation and cracking resistance.

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Section: Preconditioning and Accelerated Carbonation Testsupporting

confidence: 89%

“…The mass of sample was weighed periodically, and its relationship with the drying age was plotted, as shown in Figure 2. The mass curve coincides with that reported elsewhere [30], where the mass of the sample reduced rapidly during the first month, while it tended to be constant after two months of balancing. It should be mentioned here that the sliced sample was adopted in this study with the aim of generating a plane crack system.…”

Section: Preconditioning and Accelerated Carbonation Testsupporting

confidence: 89%

Tomography-Based Investigation on the Carbonation Behavior through the Surface-Opening Cracks of Sliced Paste Specimen

et al. 2020

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“…The water vapour sorption experiments are conducted by means of the traditional saturated salt solution method [30,37,38], which is easy to carry out but rather time-consuming. To save time and obtain representative results of water vapour sorption, sufficiently large disk specimens of small thickness 20mm are sawed and used [39]. As all concrete materials with cement CEM V/A are cured in lime-saturated water for 6 months, the disk specimens of size φ 65mm×20mm are thought to be saturated after immersion in water for another 7 days.…”

Section: Water Vapour Sorption Experimentsmentioning

confidence: 99%

Indirect assessment of hydraulic diffusivity and permeability for unsaturated cement-based material from sorptivity

Zhang

Chen

Wang

et al. 2016

Cement and Concrete Research

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International audienceThe hydraulic diffusivity, water permeability and relative gas permeability for cement-based materials are indirectly evaluated from measured sorptivity and water vapor sorption isotherms (WVSIs). The dependence of sorptivity on initial saturation degree is first established to help calculate hydraulic diffusivity and other transport properties. An experimental program with a self-scaled preconditioning strategy is also carefully designed and conducted on three concretes to measure their sorptivity, WVSIs as well as permeability to various fluids. It's found that hydraulic diffusivity of ambiguous physical significance may be not a good durability indicator. The predicted water permeability is larger than measured value but at the same order of magnitude. This overestimation is attributed to the required drying preconditioning. The predicted relative water permeability agrees well with reported data. However, the predicted relative gas permeability agrees with the measured data from classical CEMBUREAU method better than that from tri-axial permeameter with higher inlet gas pressure

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“…It is indeed interesting to note that this duration could be significantly reduced by using finer disks (Q. Wu et al 2015) and even extrapolating the equilibrium state (Tada and Watanabe 2005;Anderberg and Wadsö 2008).…”

Section: Resultsmentioning

confidence: 99%

The Use of Sorption Balance for the Characterization of the Water Retention Curve of Cement-Based Materials

Poyet

Trentin

Amblard

2016

ACT

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Among the necessary data in the description of the transport of water, the retention curve is a vital piece of information whose characterization can turn out to be long and fastidious. Within this framework, sorption balance is being put to use more and more often in laboratories. These experimental devices enable a faster onset for water balance using small amounts of substances previously reduced to powder. This approach proves to be particularly adapted to homogenous materials (cement pastes generally) but not to concrete because of the presence of aggregate. This article, first of all, clarifies in a summarized manner the working of sorption balance based on the results obtained with cement pastes. Secondly, a simplified method is proposed to test concrete.

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Representative volume element estimation for desorption isotherm of concrete with sliced samples

Cited by 17 publications

References 44 publications

Tomography-Based Investigation on the Carbonation Behavior through the Surface-Opening Cracks of Sliced Paste Specimen

Tomography-Based Investigation on the Carbonation Behavior through the Surface-Opening Cracks of Sliced Paste Specimen

Indirect assessment of hydraulic diffusivity and permeability for unsaturated cement-based material from sorptivity

The Use of Sorption Balance for the Characterization of the Water Retention Curve of Cement-Based Materials

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