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Numerical Study of the Creep of Slit Nanopores: Role of Water
Creep of cementitious materials is known to originate mostly from the creep of calcium silicate hydrates (i.e., C-S-H). Here, we study numerically a model for the C-SH structure, and explicitly calculate the energy barriers that impact the rate at which two C-S-H layers slide over each other. In particular, we calculate how the viscosity scales with the microprestress. The obtained scaling is consistent with the microprestress theory which can explain why long-term creep of cementitious materials is a logarithmic function of time. Calculations are performed at various basal spacings (i.e., at various water contents), and model predictions are compared with experimental data obtained by micro-indentation of how the long-term logarithmic creep rate of C-S-H depends on the relative humidity. Considering properties of the interlayer water identical to those of bulk water, we obtain a good agreement with the experimental observations.
Numerical Study of the Creep of Slit Nanopores: Role of Water
Creep of cementitious materials is known to originate mostly from the creep of calcium silicate hydrates (i.e., C-S-H). Here, we study numerically a model for the C-SH structure, and explicitly calculate the energy barriers that impact the rate at which two C-S-H layers slide over each other. In particular, we calculate how the viscosity scales with the microprestress. The obtained scaling is consistent with the microprestress theory which can explain why long-term creep of cementitious materials is a logarithmic function of time. Calculations are performed at various basal spacings (i.e., at various water contents), and model predictions are compared with experimental data obtained by micro-indentation of how the long-term logarithmic creep rate of C-S-H depends on the relative humidity. Considering properties of the interlayer water identical to those of bulk water, we obtain a good agreement with the experimental observations.
Numerical Study of the Creep of Slit Nanopores: Role of Water
Vandamme, M. (author) / Bažant, Z. P. (author) / Keten, S. (author)
10th International Conference on Mechanics and Physics of Creep, Shrinkage, and Durability of Concrete and Concrete Structures ; 2015 ; Vienna, Austria
CONCREEP 10 ; 313-317
2015-09-18
Conference paper
Electronic Resource
English
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