A LITERATURE REVIEW ON ALKALI SILICA REACTIVITY OF CONCRETE IN PAKISTAN

Abstract

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