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 language | English (US) |
|---|---|
| Pages (from-to) | 1925-1932 |
| Number of pages | 8 |
| Journal | Cement and Concrete Research |
| Volume | 33 |
| Issue number | 12 |
| DOIs | |
| State | Published - Dec 2003 |
All Science Journal Classification (ASJC) codes
- Building and Construction
- General Materials Science
Keywords
- Cement paste
- Creep
- Elastic moduli
- Permeability
- Stress relaxation