Title:
Modeling Shrinkage of Portland Cement Paste
Author(s):
Feng Lin and Christian Meyer
Publication:
Materials Journal
Volume:
105
Issue:
3
Appears on pages(s):
302-311
Keywords:
cement paste; composites; creep; elastic moduli; micromechanical model; poromechanics; shrinkage
DOI:
10.14359/19828
Date:
5/1/2008
Abstract:
A multi-scale constitutive model that simulates the shrinkage of hardening cement paste is developed based on the theories of poromechanics and mechanics of composites. Capillary stress is considered the driving force of autogenous shrinkage. The applied pressure, which can be another driving force of shrinkage for some applications, is also considered in the model. A multi-scale and micromechanical model for the elastic properties of hardening cement paste is first formulated; the nonlinearity and creep behaviors of calcium-silicate-hydrate (C-S-H), which are of great importance for the shrinkage of cement paste, are then considered in the model. The time-dependent properties of C-S-H are back-calibrated against the experimental results for autogenous shrinkage of cement paste. The model is finally verified by reproducing the elastic properties as well as the autogenous shrinkage of different cement pastes, and the results are compared with other experimental data.