Experimental Investigation on Compressive Strength of Recycled Reactive Powder Concrete Containing Glass Powder and Rice Husk Ash

摘要

Currently, innovations on sustainable materials has been encouraged as a result of continual accumulation of different local wastes and their consequent environmental complications due to urbanization, population growth, global energy need and excess biomass raw materials use. The objective of this experimental investigation is to develop Recycled Reactive Powder Concrete (RRPC) by utilization of local wastes for structural applications. The conventional reactive powder concrete is a mixture of water, Portland cement, silica fume, fine sand, quartz powder, superplasticizer and steel fibers produced using stem curing at high temperature. In this study, finely dispersed waste ceramic powder was utilized to replace Quartz powder fully. Moreover, rice husk ash and finely dispersed waste glass powder were used in three different percentages (at 80-20%, 50-50% and 25-75%) as a raw material from waste stream to replace silica fume fully for the development of RRPC. The performances of the developed concrete were appraised in terms of compressive strengths at 7, 14 and 28 days standard curing. The experimental results indicated that development of RRPC using hand mixing at standard curing from local wastes in this study was an interesting approach to solve raw material shortage for the current generation structural concrete and to reduce waste disposal cost and related environmental issues in Africa among others. In this study, RRPC with an average compressive strength of 57.3 MPa were developed at 28 days standard curing by replacing silica fume fully with 80% finely dispersed local waste glass powder and 20% rice husk ash. Compared to the control mix, an eco-friendly concrete with 9.5% larger compressive strength can be produced from these local wastes.