Mechanical properties of rubberized concrete using truck scrap rubber

Abstract

Concrete is becoming most widely used construction material owing to its versatility and dynamic nature of adopting addition of any admixture into it. Numerous research works were being undertaken by several researchers across the globe to study the inherent nature of concrete with and without various admixtures, replacement agents and chemicals. Usage of natural resource consumption is steadily on raise which is a point to ponder and this is also widely studied in context of concrete generation which is one of the prominent CO 2 emitting industry. Usage of alternate materials in concrete production is a trend gaining impetus, many materials studied in laboratory were being used in field already. This work primarily focusses on production of concrete using crump rubber as an additive material in concrete to increase its toughness and durability. Two different strengths of concrete (M 25 and M 35 ) are studied in this work with varying proportion of rubber added to the concrete. With the results obtained via design of experiments we had added crump rubber from 10 to 30% with reference to the weight batching and conducted experiments in M 35 grade concrete. Strength characteristics such as compressive, tensile (split) and modulus of rupture is calculated which is found to be decreasing with the increasing percentage of crump rubber. This may be the effect of voids created due to the crump rubber addition which can be filled via addition another admixture. Comparing with the control concrete a decrease in strength of about 18%, 39% and 26% is obtained for M 25 grade of concrete concerned with Compressive, Tensile and Flexural strengths, respectively. Concerned with the M 35 grade of concrete the same is found to be at 20%, 47% and 33% for Compressive, Tensile and Flexural strengths respectively comparing to the respective controlled concrete. Hence usage of crump rubber is suggested only at an optimal level above which the strength seems to be reducing.