Valorization of plastic wastes (PVC) in sand concretes: Experimental approach and durability analysis

Recent research highlights the use of eco-friendly waste materials, such as plastic, to improve concrete performance and sustainability. Similarly, sand concrete is being enhanced through waste reuse to increase its durability and competitiveness. For confirmation purposes, this study was conducted to investigate the recycling of Polyvinyl Chloride (PVC) plastic wastes, originating from sawing and cutting PVC profiles in carpentry workshops, in the form of fines. The aim was to partially replace limestone fines in the composition of sand concrete at substitution rates of 3%, 6%, 9%, and 12%. Likewise, the development of the properties of such concretes was studied in their fresh state (density, workability) and hardened state (compressive strength and flexural tensile strength, sclerometer test, ultrasonic pulse velocity). As for durability, it was investigated by testing water absorption through immersion and capillary action, water-accessible porosity, and behavior in aggressive environments (H2SO4, HCL). In consequence, the results obtained were compared with control samples with a 0% substitution rate. The results have clearly demonstrated that partial substitution led to a significant change in the properties of fresh and hardened concrete. In particular, replacing 6% of fine limestone with recycled plastic waste gave satisfactory results.