experimental investigation of the effects of using waste rubber ash on mechanical properties of plain concrete

In this study, the effects of using rubber ash on the mechanical properties of plain concrete were experimentally investigated. the main purpose of this study was to determine the proper fraction of rubber ash to be utilized in concrete by investigating the mechanical properties of concrete such as elasticity modulus, compressive strength, tensile strength, bending strength, and fresh concrete slump. four different fractions of rubber ash (2.5, 5, 7.5 and 10% of cement weight) were added to the concrete mixture. based on the results achieved from the tests conducted on the specimens, it could be deduced that adding rubber ash to concrete considerably increased compressive and bending strength and reduced the slump flow. it also increased tensile strength and elasticity modulus at a lower level.