Microprestress-solidification theory and creep at variable humidity and temperature

Zdenek P Bazant*, Milan Jirásek

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingChapter

2 Scopus citations

Abstract

After an initial period of less than one year, the relative decrease of creep rate with the age at loading is much stronger than the relative decrease of the growth rate of hydration degree. This suggests another source of long-term aging, which is explained by relaxation of the so-called microprestress. We conceive the microprestress as an overall characteristic of the disjoining pressures in nanopores filled by hindered adsorbed water and the counterbalancing tensile stresses in the nanostructure of hydrated cement. We model mathematically how the microprestress gets generated by the volume changes due to hydration as well as the pore water content changes and temperature changes. To anchor the model physically, we discuss the pore structure of hydrated cement and water adsorption on its enormous internal surface. We also present an alternative computational approach in which the microprestress changes are replaced by viscosity variation and show how the microprestress theory is easily incorporated into finite element programs for creep.

Original languageEnglish (US)
Title of host publicationSolid Mechanics and its Applications
PublisherSpringer Verlag
Pages455-498
Number of pages44
Volume225
DOIs
StatePublished - Jan 1 2018

Publication series

NameSolid Mechanics and its Applications
Volume225
ISSN (Print)0925-0042

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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    Bazant, Z. P., & Jirásek, M. (2018). Microprestress-solidification theory and creep at variable humidity and temperature. In Solid Mechanics and its Applications (Vol. 225, pp. 455-498). (Solid Mechanics and its Applications; Vol. 225). Springer Verlag. https://doi.org/10.1007/978-94-024-1138-6_10