Every year, a large number of tires are produced in the world. For example, in our country, Iran, more than 12 millions worn tires are produced every year. On the other hand, it is not possible to dispose these tires in nature. As we know, a worn tire always decomposes at a slow speed; It also causes a lot of environmental pollution, so the optimal use of these wastes was considered by many researchers. On the other hand, one of the problems in limiting the use of concrete in constructions with special conditions is the presence of brittleness and malleability of the material, which is why many of them try to solve this problem. During the research, the use of rubber waste in asphalt and concrete can be considered as a good option to dispose of this waste due to its high use in industry. Adding rubber to concrete improves some of the static and dynamic properties of concrete, such as more energy absorption by the concrete, better deformation, crack resistance, impact resistance, or lower specific gravity. In terms of thermal performance, it improves the insulation properties of concrete and modulates the temperature inside the building by several degrees Celsius, and can save energy consumption to heat or cool the interior of the building. In the present study, the mechanical properties of concrete containing scraps rubber and powders rubber and the thermal performance of concrete panels containing rubber aggregates are eva‎luated with a 24-hour temperature simulator. The results of the use of scraps rubber in concrete show that, despite the reduced compressive, tensile, and flexural strength of the concrete, the samples undergo a softer failure. In addition, the percentage of water absorption of concrete increased for 20% of the fine-grained substrate but decreased for 40 and 60% of fine-grained substitute, and with increasing the percentage of rubber, the heat transfer coefficient decreased and the thermal resistance of the samples increased. The time lag due to the increase in thermal resistance of concrete causes the displacement of the peak point of energy consumption during the day and night, which fulfills the environmental goals of this research.

مرتضي مدح خوان

عبدالرضا عطائي، كياچهر بهفرنيا