Utilization of Bottom Ash and Pond Ash as a Partial Replacement for Sand in Cement Mortar and Concrete: A Critical Review

The rapid depletion of natural building materials is mainly caused by the exponential increase in construction operations. The need for and inevitability of finding alternative building materials to partially replace traditional materials in construction are unavoidable. In this study, the idea of using pond ash and bottom ash as a partial replacement of fine aggregates in concrete is examined, and the effects of pond and bottom ash on the fresh and mechanical properties of concrete are investigated, as reported in the literature. Being affected by the coal burning system, the chemical and physical properties of pond ash and bottom ash vary across various sources and years of investigation. Many experiments have shown that bottom ash and pond ash can be used in the right proportions to provide workability and increased strength of concrete. The idea of turning a variety of waste into wealth to conserve essential green space is backed by nearly every academic. Again, the increased use of fly ash (FA) and pond ash (PA) as an alternative to river sand will reduce river sand extraction and ensure the long-term stability of a green river ecosystem.