Numerical Study of the Creep of Slit Nanopores: Role of Water

M. Vandamme, Z. P. Bažant, S. Keten

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Scopus citations

Abstract

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.

Original languageEnglish (US)
Title of host publicationCONCREEP 2015
Subtitle of host publicationMechanics 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
EditorsJohann Kollegger, Christian Hellmich, Bernhard Pichler
PublisherAmerican Society of Civil Engineers (ASCE)
Pages313-317
Number of pages5
ISBN (Electronic)9780784479346
DOIs
StatePublished - Jan 1 2015
Event10th International Conference on Mechanics and Physics of Creep, Shrinkage, and Durability of Concrete and Concrete Structures, CONCREEP 2015 - Vienna, Austria
Duration: Sep 21 2015Sep 23 2015

Publication series

NameCONCREEP 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

Other

Other10th International Conference on Mechanics and Physics of Creep, Shrinkage, and Durability of Concrete and Concrete Structures, CONCREEP 2015
CountryAustria
CityVienna
Period9/21/159/23/15

ASJC Scopus subject areas

  • Mechanics of Materials
  • Building and Construction

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    Vandamme, M., Bažant, Z. P., & Keten, S. (2015). Numerical Study of the Creep of Slit Nanopores: Role of Water. In J. Kollegger, C. Hellmich, & B. Pichler (Eds.), 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 (pp. 313-317). (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). American Society of Civil Engineers (ASCE). https://doi.org/10.1061/9780784479346.036