Thermal conductivity, compressive strength and ultrasonic wave velocity of cementitious composite containing waste PET lightweight aggregate (WPLA)

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Engineering Properties of Concrete with Waste Recycled Plastic: A Review (2018, background): “Several studies have reported a decrease in the thermal conductivity of concretes with waste plastic aggregate addition [15,48,49] (Figure 18).”
Ultra-lightweight concrete: Conceptual design and performance evaluation (2015, methodology): “[15] studied lightweight concrete applying waste PET as LWA.”
Current Sustainable Trends of Using Waste Materials in Concrete—A Decade Review (2020, background): “The thermal performance of concrete and mortar positively benefit from the addition of PAs and PFs. Thermal conductivity decreases with increasing aggregate replacement ratio [63,64,80–83] and fiber volume fraction [84,85].”
Effect of incorporating PVC waste as aggregate on the physical, mechanical, and chloride ion penetration behavior of concrete (2015, background): “[26], who demonstrated that poor contact between a plastic LWA and the matrix led to a drop in the compressive strength.”