Title: Behavior of Alkali-Silica Reaction-Affected Reinforced Concrete Elements Subjected to Shear
Author(s): Anca C. Ferche and Frank J. Vecchio
Publication: Structural Journal
Appears on pages(s): 163-174
Keywords: alkali-silica reaction; ductility reduction; reinforced concrete; shear capacity
Past research on the effects of alkali-silica reaction (ASR) on the behavior of shear-critical concrete structures have yielded contradictory results, whether they have come from full-scale tests on specimens extracted from existing ASR-affected structures or from laboratory specimens conditioned to accelerate the rate of the reaction. Both increases and decreases in the shear capacity of ASR-affected specimens were reported, when compared with either corresponding control specimens or theoretical strength. Experiments were performed to better characterize the response of ASR-affected reinforced concrete. Ten panels were constructed and tested under in-plane pure shear loading conditions. The panels, containing varying amounts of in-plane and out-of-plane reinforcement, were cast with either non-reactive aggregate, reactive fine aggregate (Jobe-Newman), or reactive coarse aggregate (Spratt). To accelerate the rate of the reaction, the specimens were conditioned under elevated humidity and temperature. Test results indicated that the load capacity of the panels was not adversely affected by ASR strains ranging between 1.2 × 10–3 and 2.5 × 10–3, as measured on corresponding standard expansion prisms, and that the shear stress at first cracking was in fact elevated. The panels’ deformation capacity, however, was reduced by approximately 30% for the reactive specimens compared to similar non-reactive ones.