The global accumulation of plastic waste presents significant environmental challenges, contributing to both land and marine pollution. Polypropylene (PP) has been identified to be a plastic type with higher production rates with the lowest recycling percentages. Since PP is relatively tough, researchers are exploring the use of recycled PP waste plastic as an alternative to concrete aggregate, where it may be a potential solution to both plastic waste mitigation and address the growing scarcity of natural aggregates. This study investigates the effect of 20% of volumetric replacement of natural coarse aggregates (NCA) with recycled Polypropylene plastic aggregates (PPA) in both normal strength concrete (NSC) and high strength concrete (HSC). The experimental studies focused on evaluating workability, compressive strength and splitting tensile strength. The target strength classes for NSC and HSC were C25/30 and C55/60. The results revealed that for both NSC and HSC the workability reduced with the incorporation of PPA, mainly caused by the irregular shape and sharp edges of PPA. Thus, the use of a superplasticizer was essential in achieving the specified standards. However, it was essential to control its dosage and use appropriate compaction techniques to maintain the homogeneity and performance of concrete without any loss in strength due to segregation. With 20% replacement of NCA with PPA, 21% and 30% reductions were observed in compressive strength and tensile strength respectively for NSC. Similarly, for HSC, 25% and 36% respective reductions were present.