A LITERATURE REVIEW ON ALKALI SILICA REACTIVITY OF CONCRETE IN PAKISTAN

Abstract

Pakistan has variety of topographic features including planes, sub-mountainous andmountainous ranges. These mountainous and sub-mountainous ranges possess a vast potential forconcrete aggregates. However, alkali silica reactivity has largely been observed in the past, due toreactive nature of these aggregates. This study was planned to explore the possible causes of alkalisilica reaction (ASR) and their consequences in the environment of Pakistan. Several materials can beused economically to mitigate alkali silica expansion. Among all possible remedies, use of granulatedblast furnace slag is the most effective and economical option to control ASR. Use of other materialssuch as calcined or bentonite clay, rice husk ash, bagasse ash and silica fume may be effective againstASR.