In this era of Global Warming, the increase in plastic waste has become a major concern in our society. The influence of plastic waste can be minimized by using them in the concrete. The plastic can lead to the increment in the strength of the mix. The objective of this research is to investigate the effectiveness of using waste plastic as the fine aggregate replacement in concrete mixtures. The compressive and tensile strengths of various concrete specimens were tested to determine how the replacement of fine aggregate by plastic waste would affect the development of strength in the mixes. For different plastics, the different methodology was taken into the consideration. For plastic bottle mix concrete, the size of the bottle had an impact on strength. Both the strength, i.e., compressive and tensile increased due to it. By using the plastic bag and seat, the compressive strength decreases while tensile strength increases while by using PVC in concrete, both the strength increases. The 10% replacement level only showed a 15% loss of compressive strength at 28 days compared to the control. Despite being much weaker in compression, the tensile strength test showed that 10%, 20%, and 30% replacements were stronger in tension compared to the control.