Utilization of Rice Husk Ash and Waste Foundry Sand as Partial Replacement for Cement and Fine Aggregate in Concrete

Abstract

 Concrete is one of the extensively used material all over the world. Increasing rate of urbanization and industrialization has lead to over exploitation of natural resources. Hence it is necessary to use alternate materials in concrete. This work presents the benefits from various ratios of rice husk ash (RHA) on concrete indicators with proportions of 5, 10, 15, 20, 25% RHA by the weight of cement in addition to this a constant amount of 30% waste foundry sand (WFS) by the weight of crushed stone sand has been replaced in the concrete and it has been compared with control concrete with no additives. M20 concrete with water cement ratio of 0.5 has been used. The workability of the concrete decreases as the RHA with the WFS increases. The optimum content found to be RHA10%+WFS30% for compressive strength, split tensile strength and Flexural strength test. The durability properties of the concrete have shown better results, i.e. as the 30%WFS with RHA content increases the water absorption, RCPT, sorptivity value decreases.