Evaluation of strength of porous concrete made using scrap rubber

Porous concrete is one of the types of coatings used in rigid pavements. High porosity and good drainage efficiency have increased the use of this type of concrete in urban floods and runoff management. On the one hand, there is a large amount of corroded rubber produced annually in the world, which, due to the very slow rate of decomposition and contamination resulting from it, cannot be buried in the environment. The use of these worn-out tires in concrete is a good option to dispose of these wastes. In this study, experiments were conducted to investigate the effect of using scrap tires on the properties of porous concrete, and 5 modes of replacement of natural concrete aggregates with crumb rubber, including 5, 10, 15, 20 and 25 The percentage has been examined. The results show that replacement of crushed rubber and aggregates in porous concrete mixing design will reduce compressive and tensile strength. The effect of the presence of particulate rubber in the design of porous concrete mix on the reduction of tensile strength is more than its effect on the reduction of compressive strength. The results show that with increasing percentage of replacement of particulate rubber and aggregates in porous concrete, both porosity and permeability increase. Also, the compressive and tensile strength of specimens containing particulate rubber, after being placed in the sulfate medium, is lower than the compressive and tensile strength of the control sample