State-of-the-art-review on rice husk ash: A supplementary cementitious material in concrete

Rice husk ash (RHA) is a good supplementary cementitious material for concrete production, as it requires low energy and emits negligible greenhouse gas during processing and service life as well as it shows high pozzolanic reactivity. The pozzolanic reactivity of RHA depends on its amorphous silica content, fineness, mix proportion, available alkaline media, and temperature because all of these factors are related to the dissolution of silica from RHA. Thus, incineration time, temperature, processing, and grinding of RHA should be controlled to acquire the desired level of pozzolanic reactivity. Depending on the filler effect and pozzolanic reactivity of RHA, concrete’s strength varies. The RHA-blended cement concrete possesses dense microstructure, high mechanical performance, and enhanced durability against harsh environmental exposure. However,…