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This study proposes the use of waste plastics namely high density polyethylene (HDPE), low density polyethylene (LDPE), polypropylene ethylene (PPE) as a replacement to natural coarse aggregates in M20 mix concrete. The study was carried out by testing specimens prepared by replacing recycled waste plastic coarse aggregates (RPCA) produced using semi mechanized process and conventional mix for their workability, compressive strength, flexural strength, split tensile strength and behavior of plastic aggregates at high temperature. Three different set of plastic aggregates were produced by using HDPE LDPE PPE plastic wastes respectively. It was observed that concrete mixes with increasing percent of plastic waste aggregates showed decrease in workability. Compressive strength and flexural strength reduced due to weak Interfacial Transition Zone (ITZ) between plastic aggregates and paste. Tensile strength increased by addition of waste plastic aggregates due to its aggregate property. Exposure of concrete specimens to higher temperature behaved positively in strength parameters. Replacement of 10-20% of RPCA can be made without affecting strength and durability parameters.