REVIEW OF SELECTED POZZOLANAS FOR CONCRETE PRODUCTION

Abstract

In pursuit of producing a sustainable and durable concrete composite, there is need to incorporate some supplementary cementitious materials to modify its conventional properties. Several works have been done on the utilization of agricultural and industrial wastes as pozzolans in concrete. However, there are some naturally occurring materials that also exhibit additional binding tendency that are yet to be explored. Cement being a conventional binder in concreting undergoes hydration reaction producing lime as one of its by-products. This causes expansion thereby predisposing the composite to disintegration and hence, untimely failure. Pozzolans have the tendency of forming additional binding property when in contact with this lime in the presence of water. Lot of research has been carried out on its properties and effects in concrete. However, there have been disparities in the optimum percentage replacement of various pozzolans in concrete. This article focuses on previous findings on the utilization of pozzolans in concrete and its prospects in the construction industry.