Effect of Ash Tires on Mechanical Properties and Durability of Concrete Shotcrete and Comparison with Concrete Shotcrete Containing Nano-Silica

Annual about 150 thousand tons of old tire is produced in Iran. There is no possibility to dispose of the waste in the environment. Because tire is decomposition with low speed and makes mush pollution in the environment, thus optimal use of these wastes has become a necessary. In this study, tensile, flexural and compressive strength of 28-day and 70-day compressive strength of concrete is studied in the environment of the acid and alkaline. Thus, it is considered the percentage of ash tire by weight relative to the weight of the cement equivalent to 1%,2%, 3%, and the water – cement ratio equal to 40%, 45% and 50%. Experimental results show that the addition of tire powder, concretes shotcrete improved mechanical properties including compressive strength, tensile strength and bending strength. Also, the mechanical strength of shotcrete containing tire powder is much more than the corresponding conventional shotcrete containing Nano-silica.