The non-biodegradable character of plastics is of concern to the scientists and environmentalists worldwide. Consequently, there is an exigent need to identify avenues for the utilization of recycled plastics. Its use in concrete is one of potential applications. The utilization of recycled plastic in concrete, as a partial/full replacement of natural aggregates, resolves the concern related to its safe disposal and conserves resources of natural aggregates. The reported study was conducted to assess the possibility of utilizing recycled waste plastic, as a replacement of natural aggregates in concrete. Concrete specimens were prepared utilizing three different types of recycled plastics at varying proportions and they were evaluated to assess their mechanical and thermal properties. Lightweight concrete with a unit weight of 1500 kg/m³ and a compressive strength of 17 MPa was developed utilizing 100% recycled plastic aggregate (RPA). However, the unit weight and compressive strength of concrete with 25% RPA were 2000 kg/m³ and 35 MPa, respectively. The flexural strength, modulus of elasticity and bond strength of the RPA concrete decreased with increasing quantity of RPA. A similar behavior in thermal conductivity was noted. The thermal conductivity of the control concrete was 1.7 W/mK while it was around 1.1–0.5 W/mK in the RPA concrete. Correlations between the mixture parameters and mechanical and thermal properties of RPA concrete were also developed. Recommendations on the quantities of RPA to be used for the production of lightweight concrete of varying strength grades are also provided.

塑料的不可生物降解特性是全世界科学家和环保主义者关注的问题。因此，迫切需要确定利用再生塑料的途径。它在混凝土中的使用是潜在的应用之一。在混凝土中利用再生塑料作为天然骨料的部分/全部替代，解决了与其安全处置有关的担忧，并节省了天然骨料的资源。进行了报道的研究，以评估利用再生废塑料替代混凝土中天然骨料的可能性。使用三种不同比例的再生塑料制备混凝土试样，并对其进行评估以评估其机械和热性能。单位重量为1500 kg / m的轻质混凝土^{如图3所示}，利用100％的再生塑料骨料（RPA）开发了17MPa的抗压强度。但是，RPA为25％的混凝土的单位重量和抗压强度分别为2000 kg / m ³和35 MPa。RPA混凝土的抗弯强度，弹性模量和粘结强度随RPA用量的增加而降低。注意到在热导率方面类似的行为。对照混凝土的导热系数为1.7 W / mK，而RPA混凝土的导热系数约为1.1–0.5 W / mK。还研究了RPA混凝土的混合参数与机械和热性能之间的相关性。还提供了有关用于生产不同强度等级的轻质混凝土的RPA数量的建议。