The Effect Of Waste Tyre Rubber On Mechanical Properties Of Normal Concrete And Fly Ash Concrete

Abstract

Waste tyre rubber is one of the waste materials, which is produced excessively worldwide every year. The disposal of this rubber has a major problem in the environment as its decomposition takes a long time and also produces environmental pollution. One of the alternative solutions is to use the scrap waste tyre rubber as a partial replacement of natural aggregate in concrete. This paper presents the experimental study on the effect of waste tyre rubber in the form of crumb rubber as a partial fine aggregate replacement on normal and fly ash concrete. The content of fly ash in the fly ash concrete was 15 % by replacing the cement weight. A total of 60 concrete cylinders were cast and tested to evaluate its compressive and splitting tensile strength. The use of crumb rubber from the waste tyre in both normal concrete and FA concrete is 5%, 10%, 15%, and 20% based on fine aggregate volume. The results show that rubberized concrete has low workability, compressive and tensile strengths but it has greater crack resistance when compared with ordinary concrete. The more percentage of crumb rubber on both the rubberized normal concrete (RNC) and the rubberized fly ash concrete (RFAC) result in a higher decrease in compressive and tensile strengths of the concrete. Compared to RNC, RFAC has a higher strength in each crumb rubber content due to the presence of fly ash. From this study, it is recommended to use the crumb rubber as a fine aggregate replacement with the maximum content of 10% and 15% on normal concrete and fly ash concrete, respectively.