EFFECT OF ALKALI SILICA REACTION EXPANSION AND CRACKING ON STRUCTURAL BEHAVIOR OF REINFORCED CONCRETE BEAMS

摘要: A laboratory study was carried out to investigate the effect of deleterious alkali-silica reaction (ASR) expansion on structural behavior reinforced concrete beams and mechanical properties cylinders made with same concrete. The specimens were conditioned by immersion in a cyclically heated alkali solution for one year accelerate ASR. To simulate in-service conditions, two held under load that caused flexural cracking while being conditioned. Cracks first observed at an age 125 days. Before ASR occurred, changes reactive minor. After cracking, compressive strength, splitting tensile dynamic modulus significantly reduced. top after 6 months conditioning oriented direction parallel reinforcement. However, year, strength experienced nearly as nonreactive beams. Effect preloaded cracked also insignificant.