This paper presents the mechanical and physical properties of mortar. In the mortars, the fine aggregate was replaced with plastic waste at ratios of 0, 5, 10, 15, and 20% by volume. The mortar properties including flow, compressive strength, splitting tensile strength, flexural strength, density, water absorption, porosity, ultrasonic pulse velocity, thermal conductivity, and acid resistance were tested. The results indicate that the using plastic waste as a partial replacement of fine aggregate in mortar reduced compressive strength, flexural strength, and splitting tensile strength. The lowest strengths appeared when sand was replaced with plastic waste at ratios of 20% with about 55% reducing from control mortar. Also, the using plastic waste increased water absorption and porosity while density, ultrasonic pulse velocity, and thermal conductivity seemed to reduce. For the flow values and acid resistance, they slightly reduced.
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