In this study, the possibility of substituting waste materials with natural aggregates is considered. Used waste materials are limited to recycled concrete aggregate (RCA), waste glass (WG) and waste plastic (WP). Substitution percent (by weight) for all three waste materials are (0, 5, 10, 15 and 20). RCA is substituted by both fine and coarse aggregates, while WG and WP are substituted only as fine aggregate in concrete mixtures. Workability, compressive strength, tensile strength, flexural strength, hardened unit weight, electrical resistivity, dynamic modulus of elasticity and water absorption of the concrete are evaluated. WG and RCA (fine and coarse) had no remarkable effect on mechanical properties of concrete, while WP decreased mechanical properties and hardened unit weight remarkably. Workability reduced by substituting WP and RCA by natural aggregates, while WG had no influences on slump value. Water absorption and electrical resistivity of concretes containing WG and WP were higher than those of control concrete.
