The present research aims at evaluating the mechanical performance of untreated and treated crumb rubber concrete (CRC). study was also conducted to reduce loss in properties CRC. In this study, sand replaced with (CR) 0%, 5%, 10%, 15%, 20% by volume. CR NaOH, lime, common detergent for 24 h. Furthermore, water treatment carried out. All these treatments were done enhance that are affected addi...