Flexural performance of reinforced concrete beams damaged by Alkali-Silica Reaction

摘要: Abstract Alkali-Silica Reaction (ASR) affects concrete and decreases its mechanical characteristics. However, for some reinforced structures, the global behaviour can appear to be improved by ASR: similar reinforcement, first flexural cracking of reactive beams usually occurs higher loading than in non-reactive beams. The failures two beams, one non-reactive, are numerically simulated here order discuss origins delay observed beam. poromechanical model used considers swelling anisotropy, is able differentiate ASR diffuse from structural macrocracks coupling both crack types with creep. According results, due chemical prestress induced being restrained direction reinforcements; has decompressed before cracking. modelling presented paper reproduce differences between beam reference one. obtained test seems interesting point view. this performance could counterbalanced durability problems that parallel reinforcements. In fact, these cracks, also evaluated present modelling, privileged paths ingress deleterious agents such as carbonates or chlorides.