Experimental and numerical investigation of drying rate impact on moisture loss, exchange coefficient and drying shrinkage of cement paste

Kinda, Justin; Bourdot, Alexandra; Charpin, Laurent; Michel-Ponnelle, Sylvie; Adia, Jean-Luc; Thion, Romain; Legroux, Remi; Benboudjema, Farid

doi:10.1016/j.conbuildmat.2022.127099

Cited by 5 publications

(4 citation statements)

References 56 publications

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“…The main objective of this analysis is to test the capability of the model to estimate the drying shrinkage strain of cement paste. For this, recent work by Kinda [76] is found to be the most appropriate experimental campaign as it not only addresses the drying shrinkage of the VeRCoRs cement paste material but also considers sample sizes of 200 µm, 500 µm, and 2 mm, which are reasonably close to the material point of view and are hence easier to compare with the model results, which is targeted towards the representative volume element (RVE) analysis. Moreover, an important conclusion from Kinda's study is that the drying shrinkage is more or less independent of the specimen shape, size, and drying rate for the range of samples that was considered.…”

Section: Sck Cen Model For Drying Shrinkagementioning

confidence: 99%

“…VeRCoRs hardened cement paste samples were cured for 3-6 months under endogenous conditions [76]. These were directly subjected to drying after curing; hence, the measured total drying shrinkage included reversible as well as irreversible strains, e.g., due to any cracking or densification of C-S-H. Based on the cement composition in Table 1, cement hydration kinetics are computed using VCCTL [77].…”

Section: Sck Cen Model For Drying Shrinkagementioning

confidence: 99%

“…Equation ( 5) was derived from experiments on larger-sized samples where cracking may have occurred during drying, especially at very low degrees of saturation. However, in the experiment, the size of the samples was small enough to avoid cracking [76].…”

Section: Sck Cen Model For Drying Shrinkagementioning

confidence: 99%

See 2 more Smart Citations

Benchmarking Standard and Micromechanical Models for Creep and Shrinkage of Concrete Relevant for Nuclear Power Plants

Šmilauer,

Dohnalová,

Jirásek

et al. 2023

Materials

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The creep and shrinkage of concrete play important roles for many nuclear power plant (NPP) and engineering structures. This paper benchmarks the standard and micromechanical models using a revamped and appended Northwestern University database of laboratory creep and shrinkage data with 4663 data sets. The benchmarking takes into account relevant concretes and conditions for NPPs using 781 plausible data sets and 1417 problematic data sets, which cover together 47% of the experimental data sets in the database. The B3, B4, and EC2 models were compared using the coefficient of variation of error (CoV) adjusted for the same significance for short-term and long-term measurements. The B4 model shows the lowest variations for autogenous shrinkage and basic and total creep, while the EC2 model performs slightly better for drying and total shrinkage. In addition, confidence levels at 5, 10, 90, and 95% are quantified in every decade. Two micromechanical models, Vi(CA)2T and SCK CEN, use continuum micromechanics for the mean field homogenization and thermodynamics of the water–pore structure interaction. Validations are carried out for the 28-day Young’s modulus of concrete, basic creep compliance, and drying shrinkage of paste and concrete. The Vi(CA)2T model is the second best model for the 28-day Young’s modulus and the basic creep problematic data sets. The SCK CEN micromechanical model provides good prediction for drying shrinkage.

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Section: Sck Cen Model For Drying Shrinkagementioning

confidence: 99%

Section: Sck Cen Model For Drying Shrinkagementioning

confidence: 99%

See 1 more Smart Citation

Benchmarking Standard and Micromechanical Models for Creep and Shrinkage of Concrete Relevant for Nuclear Power Plants

Šmilauer,

Dohnalová,

Jirásek

et al. 2023

Materials

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show abstract

“…Typically, in order to measure the sorption kinetics, a sample of material is placed in a climatic chamber supposed to be able to maintain the air around the sample at a given value of RH, i.e., n ∞ , while the material has been prepared under a different RH, i.e., n 0 . ,,,− The sorption dynamics of the material is then expected to depend on n ∞ and n 0 , and it is described through the relative variation of the sample mass in time. In that case, it is implicitly assumed that there is negligible air flow and, for the relevance of the theoretical analysis, that the boundary condition, i.e., the RH along the surface of the sample, remains equal to the ambient one, i.e., n ∞ .…”

Section: Introductionmentioning

confidence: 99%

Critical Role of Boundary Conditions in Sorption Kinetics Measurements

Zou,

Yan,

Maillet

et al. 2023

Langmuir

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In order to characterize the hygroscopic properties of cellulose-based materials, which can absorb large amounts of water from vapor in ambient air, or the adsorption capacity of pollutants or molecules in various porous materials, it is common to rely on sorption-desorption dynamic tests. This consists in observing the mass variation over time when the sample is placed in contact with a fluid containing the elements to be absorbed or adsorbed. Here, we focus on the case of a hygroscopic material in contact with air at a relative humidity (RH) differing from that at which it has been prepared. We show that the vapor mass flux going out of the sample follows from the solution of a vapor convection-diffusion problem along the surface, and is proportional to the difference between the RH of the air flux and that along the surface with a multiplicative factor (δ) depending only on the characteristics of the air flux and the geometry of the system, including the surface roughness. This factor may be determined from independent measurements in which the RH along the surface is known, while keeping all other variables constant. Then we show that the apparent

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Study on multi-performance optimization of basalt stone powder supplementary cementitious materials

Ye,

Qiao,

Feng

et al. 2023

Journal of Building Engineering

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Experimental and numerical investigation of drying rate impact on moisture loss, exchange coefficient and drying shrinkage of cement paste

Cited by 5 publications

References 56 publications

Benchmarking Standard and Micromechanical Models for Creep and Shrinkage of Concrete Relevant for Nuclear Power Plants

Benchmarking Standard and Micromechanical Models for Creep and Shrinkage of Concrete Relevant for Nuclear Power Plants

Critical Role of Boundary Conditions in Sorption Kinetics Measurements

Study on multi-performance optimization of basalt stone powder supplementary cementitious materials

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