Mechanical Properties of Waste Tire Rubber Concrete

Abstract

The consumption of waste tire rubber in concrete has gained more attention from the point of view of enhanced engineering properties of the product, and also sustainability. Numerous attempts have been stated on the use of waste tire rubbers for the replacement of fine and coarse aggregates in concrete but there is vital need to comprehensively investigate the effect of them on the mechanical properties of rubberized concrete (RC). The aim of this paper is to explore the effect of rubber types and rubber content on mechanical properties of concrete. The compressive strength, tensile strength, flexural strength, modulus of elasticity, strain at maximum strength, and compressive stress–strain curves of RC are studied. Extensive databases used for evaluating the mechanical properties of RC include the measured compressive strength of 298 mixtures, measured tensile strength of 90 mixtures, measured flexural strength of 93 mixtures, measured modulus of elasticity of 156 mixtures, and compressive stress-strain curve of 15 mixtures. Three main rubber mixtures are replaced by fine and coarse aggregate in the collected experimental results that are crumb rubber (CR, with dimension of 0.5–5 mm), tire chips (TC, with dimension of 5–25 mm), and combination of crumb rubber and tire chips (CR+TC). The mechanical properties of these three types RC are evaluated and appropriate constitutive relationships are proposed.