Evaluation of mechanical characteristics of concrete beams under constant loading with alkali-silica reaction
by Alireza Joshaghani; Mohammad Amin Moeini; Erfan Hajibandeh
International Journal of Structural Engineering (IJSTRUCTE), Vol. 8, No. 4, 2017

Abstract: This experiment studies the damaging alkali-silica reaction (ASR) expansion effects on the structural performance and mechanical properties of reinforced concrete beams. The beams were cured under standard conditions. In order to provide in-service situations, flexural loading was applied on beams to induce cracks. The newly formed strains on concrete beams were measured along with the compression and tension sections. The results showed that beams with high reactivity in aggregates suffered from more compression strain. It is noteworthy that increasing compression steel with constant tension steel eventuated to substantial effects on tension expansion. Furthermore, increasing the tension steel, while keeping compression steel constant, resulted in minor influences on compression-expansion. Effects of ASR phenomena on the mechanical characteristics and the expansion of concrete are more important and noticeable on reinforced concrete beams. In concrete beams with ASR, ultimate loading was decreased because of largely irreversible steel strains.

Online publication date: Mon, 22-Jan-2018

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