Title:
Multiaxial Expansion-Stress Relationship for Alkali Silica Reaction-Affected Concrete
Author(s):
B. P. Gautam, D. K. Panesar, S. A. Sheikh, and F. J. Vecchio
Publication:
Materials Journal
Volume:
114
Issue:
1
Appears on pages(s):
171-182
Keywords:
alkali-silica reaction; expansion-stress relationship; maximum possible axial expansion; multiaxial stress; uncoupled axial expansion
DOI:
10.14359/51689490
Date:
1/1/2017
Abstract:
Many concrete structures around the world are experiencing expansion of concrete due to alkali-silica reaction (ASR). ASR expansion is reduced in the direction of compressive stress and is transferred to the unstressed directions. However, the relationship between ASR expansion and a multiaxial stress state in concrete, which is often the case in concrete structures, is inadequately understood. This paper presents a relationship between ASR expansion and the stress state of concrete based on experimentally determined triaxial expansions of unstressed and uniaxially, biaxially, and triaxially stressed concrete cube specimens. The expansion-stress relationship is not coupled with reaction kinetics and is isolated from the effect of creep and shrinkage by subtracting the deformations measured on non-reactive control specimens. The proposed relationship was implemented in a finite element program to predict the measured expansion values on concrete cube specimens. The predicted expansions are in reasonable agreement with the measured expansions.