The Structural Engineer > Archive > Volume 70 (1992) > Issues > Issue 14 > Punching Tests on Slabs with Alkali-Silica Reaction
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Punching Tests on Slabs with Alkali-Silica Reaction

This paper summarises an experimental investigation into the effects of alkali-silica reaction (ASR) on the punching shear strength of reinforced concrete slabs. Tests were carried out on 84 reinforced concrete slabs in which ASR was accelerated in the laboratory. The variables investigated were: the amount of ASR expansion; the amount, location, end anchorage and type of reinforcement; and the external restraint to a slab. It was found that, in general, ASR expansion and cracking did not reduce the punching strength of a slab but did increase its ductility. However, at extremely high ASR free-expansions in excess of about 6000 ┬Ástrain, concrete delaminations occurred parallel to the reinforcement planes of doubly reinforced slabs, and this effect reduced the punching shear capacity of such slabs. K.E. Ng and Professor L.A. Clark

Author(s): Ng, K E;Clark, L A

Keywords: punching;shear strength;slabs;reinforced concrete;reinforcement;asr;testing;laboratory testing;anchors;cracking;expanding