Title:
Alkali-Silica Reaction-Affected Reinforced Concrete Elements Subjected to Pure Shear
Author(s):
Anca-Cristina Ferche
Publication:
Web Session
Volume:
Issue:
Appears on pages(s):
Keywords:
DOI:
Date:
10/29/2020
Abstract:
Contradicting experimental results were reported in the literature concerning the effects of alkali-silica reaction (ASR) on the structural performance of shear-critical reinforced concrete elements, 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. This presentation will explore experiments performed to better characterize the response of ASR-affected reinforced concrete. Ten 890 mm (35.6 in.) square × 70 mm (2.8 in.) thick 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.