Abstract
The behavior of confined water molecules in C-S-H has a great influence on various physical and chemical properties of C-S-H gel, which further determine the macroscale behavior of cement-based materials such as creep, shrinkage, and cracking. Here, using molecular simulations, we investigate the effect of relative humidity (RH) on the behavior of C-S-H at the molecular scale taking as reaction path the interlayer distance (spanning interlayer pores up to small gel pores). The confining pressures, desorption isotherm, the potential of mean force (PMF), stable basal spacings, meta-stable domains, elastic modulus perpendicular to the pore surface, and cavitation of nano-confined water are analyzed. We evaluate these properties as a function of interlayer distance at various RH, ranging from (liquid) saturated (RH = 100%) to completely dried (RH = 0%) conditions at ambient temperature (300 K). From the PMF profiles and pressure isotherms, we can identify equilibrium basal spacings and meta-stable domains. We observe that the stable basal spacing decreases when the RH decreases, therefore interlayer pore shrinkage contributes to drying shrinkage of cement-based materials. We also show that cavitation of water in small C-S-H interlayer spaces is pore size-dependent. Each of these properties can be useful to explain the physical origins of the thermo-hygro-mechanical behavior of cement-based materials and provide a methodology to improve the performance of these materials.
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Acknowledgement
The authors thank the financial support of the French National Research Agency (ANR) through the project THEDESCO (ANR-19-CE22-0004-01).
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Masara, F., Honorio, T., Benboudjema, F. (2023). Modeling C-S-H Sorption at the Molecular Scale: Effective Interactions, Stability, and Cavitation. In: Rossi, P., Tailhan, JL. (eds) Numerical Modeling Strategies for Sustainable Concrete Structures. SSCS 2022. RILEM Bookseries, vol 38. Springer, Cham. https://doi.org/10.1007/978-3-031-07746-3_22
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