Measuring permeability and stress relaxation of young cement paste by beam bending

W. Vichit-Vadakan, George W. Scherer

Research output: Contribution to journalArticle

45 Scopus citations

Abstract

When a saturated rod of a porous material is deflected in three-point bending, two types of time-dependent relaxation processes occur simultaneously: hydrodynamic relaxation, caused by the flow of liquid in the porous body, and viscoelastic (VE) relaxation of the solid network. By measuring the decrease in the force required to sustain a constant deflection, it is possible to obtain the permeability from the hydrodynamic relaxation function, in addition to the VE stress relaxation function of the sample. We report the early-age evolution of permeability, elastic modulus, and stress relaxation function for Type III Portland cement paste with water-cement (w/c) ratios of 0.45, 0.50, and 0.55. The stress relaxation function is shown to preserve its shape during aging; that function is numerically transformed into the creep function.

Original languageEnglish (US)
Pages (from-to)1925-1932
Number of pages8
JournalCement and Concrete Research
Volume33
Issue number12
DOIs
StatePublished - Dec 1 2003

All Science Journal Classification (ASJC) codes

  • Building and Construction
  • Materials Science(all)

Keywords

  • Cement paste
  • Creep
  • Elastic moduli
  • Permeability
  • Stress relaxation

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