Fresh and hardened properties of waste rubber tires based concrete: a state art of review

Abstract

Owing to great environmental benefits, end-of-life waste tires are often used in concrete as a partial replacement for aggregates. However, the use of waste tires in concrete deteriorates fundamental properties. For a better knowledge of the various characteristics of concrete with waste tires and to highlight ways to improve them, this study was conducted. For this purpose, the effect of waste tires on fresh properties such as workability, air content, and unit weight was reviewed. Moreover, the influence of waste tires on mechanical properties such as compressive strength, flexural strength, splitting tensile strength, and modulus of elasticity was discussed in detail. The durability characteristics such as water absorption and porosity, freeze–thaw, corrosion, chloride ion penetration, and carbonation resistance were critically evaluated. The application of waste tires for concrete used in roadside barriers was also reviewed and impact resistance, energy absorption, toughness, and ductility were summarized. Results indicate the slump of concrete increased with the substitution of rubber but decreased strength properties. Although the strength properties of rubber concrete are less but can be used for low-strength concrete. Furthermore, rubber particles are more elastic, flexible, less stiff, and deformable as compared to natural aggregates. Therefore, rubberized concrete is more suitable for roadside barriers. This review is expected to advance the fundamental knowledge of concrete with end-of-life tires and promote the recycling of end-of-life tires in the concrete industry.