Experimental study on influence of Iraqi rice husk ash as supplementary material on the performance of concrete

Abstract

oncrete is most widely utilized construction material. Cement, sand & gravel are the ingredients of the concrete where cement is costly. In this research an experimental study was conducted to find the suitability of the replacement materials that less cost than cement such as, rice husk ash. Rice husk is considered as a waste material and has a harmful effect on the environment, hence disposed from it by burning at a controlled temperature between (500 to 600) °C to produce RHA. RHA was found that contain 86.76% of silica, which indicates that it is a substance with pozzolanic properties. Cement replaced with RHA at percentage (5,10,15,20) % by weight at mix design (1: 1.89: 2.64) with W/C is 0.53 and (1: 1.43: 2.19) with W/C is 0.44 . Sixty cube were casted for test compressive strength and thirty cylinder to test split strength, also thirty prism to test flexural strength then casted ten beams to test behaviour of beam where found that added RHA will improve properties of concrete for compressive, tension, flexural strength and behaviour of beams.