<p>Concrete is one of the most common construction materials. Traditional concrete production requires a lot of materials and energy, which emits CO2 and depletes cement. Global waste plastics have increased dramatically in recent decades, making waste plastic management difficult, especially in landfills. To address these issues, this paper experiments with waste plastic and concrete. This study replaces fine aggregate in concrete with waste plastics at various percentages. 5% waste plastic is added to concrete mixes. Workability, compressive strength, density, tensile strength, UPV, and thermal conductivity were assessed. Waste plastic integration in concrete slightly reduces workability, increases compressive strength, and decreases tensile strength. This study was able to reveal the ability of recycled plastic to reduce the thermal conductivity of concrete and thus improve thermal insulation, but there was a negative impact on some properties of concrete such as decreased tensile strength and decreased workability of concrete. Therefore, there is a need to conduct more research efforts to balance all mechanical and thermal properties of concrete.</p> Graphic Abstract <p></p>