Positive and Negative Influences of Waste Tires on Self-compacting Concrete: A Summarized Review

In recent decades, manufacturing of tires have been rocketed. The main cause of this process is development of automobile industry in worldwide, so the high volume of scrap tires has been created massive stockpiles zones. Furthermore, environmental threat related to waste tires, and disposing them properly has come to a world crisis, due to the requirement more spacious storage than other wastes and the massive volume and their fixed shape. Therefore, there is immediate and effective need of recovering and reusing waste tires. Waste tires have efficient applications in engineering, especially mortars and concrete. The results of various investigations have demonstrated that rubberized self-compacting concretes show lower compressive strength, modulus of elasticity, stiffness, rheological properties, fracture energy, durability, flexural strength, ultrasonic pulse velocity etc. and higher deformability before failure, saving in cement and aggregate usage, dynamic properties, strain capacity, fatigue strength etc. Therefore, adding waste rubber into self-compacting concretes leaves a numerous positive and negative impacts on its properties. In this paper, authors present an overview of literature investigating of waste rubber used as an additive or fine and/or coarse aggregate replacement in self-compacting concrete with special attention on positive and negative influences on fresh and hardened self-compacting concrete properties.