Muhammad J Munir
Mirpur University of Science and Technology, Pakistan
Title: Mitigation of alkali silica reaction using waste rice husk ash in concrete
Biography
Biography: Muhammad J Munir
Abstract
Alkali silica reaction (ASR) is considered as the cancer of concrete. In this study, waste rice husk ash (RHA) was utilized to control ASR expansion in concrete. For this purpose, RHA was collected from local brick industry. To develop the phenomena of ASR, local reactive aggregates were used. To evaluate the ASR potential, mortar bar specimens with different RHA dosages (10%, 20%, 30% and 40% by cement weight) were prepared following ASTM C1260. Strength activity index test was performed to investigate the pozzolanic reactivity of RHA. Results showed that RHA was a pozzolanic material. For specimens incorporating 10% and 40% RHA, reduction in mortar bar expansion was observed 21% and 46%, respectively. Low calcium to silica ratio with higher alumina content was observed in mortar bar specimens during energy disperse X-ray spectroscopy (EDS) analysis, which resulted into dilution process and alkali absorption. On the basis of results, it can be concluded that RHA (10%-40% in replacement of cement) can be utilized to control ASR expansion through pozzolanic reaction.