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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: 01

Appears on pages(s): 171-182

Keywords: alkali-silica reaction; expansion-stress relationship; maximum possible axial expansion; multiaxial stress; uncoupled axial expansion

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.