TY - GEN
T1 - Numerical Study of the Creep of Slit Nanopores
T2 - 10th International Conference on Mechanics and Physics of Creep, Shrinkage, and Durability of Concrete and Concrete Structures, CONCREEP 2015
AU - Vandamme, M.
AU - Bažant, Z. P.
AU - Keten, S.
N1 - Publisher Copyright:
© ASCE.
PY - 2015/1/1
Y1 - 2015/1/1
N2 - 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.
AB - 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.
UR - https://www.scopus.com/pages/publications/84945346048
U2 - 10.1061/9780784479346.036
DO - 10.1061/9780784479346.036
M3 - Conference contribution
AN - SCOPUS:84945346048
T3 - CONCREEP 2015: Mechanics and Physics of Creep, Shrinkage, and Durability of Concrete and Concrete Structures - Proceedings of the 10th International Conference on Mechanics and Physics of Creep, Shrinkage, and Durability of Concrete and Concrete Structures
SP - 313
EP - 317
BT - CONCREEP 2015
A2 - Kollegger, Johann
A2 - Hellmich, Christian
A2 - Pichler, Bernhard
PB - American Society of Civil Engineers (ASCE)
Y2 - 21 September 2015 through 23 September 2015
ER -