بررسي رفتار ستون هاي لاغر بتني مسلح تحت اثر واكنش هاي قليايي سيليسي سنگدانه ها

Behavior of Slender Reinforced Concrete Columns Suffering from AA ^Lo ojUul Cw&lddb —ITAV j+tb .(^1 jjuC ^Ju^o) Y ejUui XV jJL> OwV.<-,jJl>S 4Jbco Alkali Silica Reaction

The object of this study was to clarify some of the fundamental problems occurring in reinforced ASR concrete slender columns. Preloading of ASR concrete results in an improvement in the mechanical properties. ASR causes a reduction in axial load capacity of slender columns. The failure of an ASR column was accompanied by a large delamination of the cover. As ASR concrete showed very substation reduction in tensile strength, this might be the cause of cracking and delamination of ASR columns. This may also be the reason why columns fail before reinforcement reaches its maximum capacity. The expansion of ASR concrete in the columns will increase the compressive stresses and result in tension in the reinforcement.