Roobankumar R, SenthilPandian M
School of Civil Engineering, Vellore Institute of Technology, Chennai Campus, Chennai, 600127, India.
Heliyon. 2024 Nov 17;10(23):e40479. doi: 10.1016/j.heliyon.2024.e40479. eCollection 2024 Dec 15.
Engineered concrete mixes using industrial waste as a construction material are an enormous step towards sustainable development and financial benefits. The refrigeration, automobile, and construction industries mainly generate polyurethane foam waste material. Most of the polyurethane foam wastes are dumped in landfills or incineration, which creates environmental effects. Polyurethane foam waste is challenging to recycle because of its bulky nature, limited recycling methods, high transportation costs, complex chemical composition, and inadequate collection and processing infrastructure. Utilizing waste polyurethane foam as lightweight aggregate in concrete serves a dual purpose: reducing natural aggregate extraction and reducing polyurethane foam waste going to landfills. This article reviewed waste disposal rigid polyurethane foam as a lightweight aggregate in concrete mixtures. Initially, it discusses the statistical data analysis, physical and microstructural properties of waste flexible and rigid polyurethane foam. After that, performance evaluations focused on fresh properties by slump tests, hardened properties by compressive strength and density, and microstructure analysis by scanning electron microscopy are presented. The study concludes that incorporating waste polyurethane foam increases workability, improves bonding between polyurethane foam aggregate and the cementitious matrix, and reduces concrete density and compressive strength for lightweight concrete structures. This paper discusses the benefits of utilizing solid waste rigid polyurethane foam in concrete compared to conventional concrete. This study also identified the research gaps in the current state of knowledge and provided few recommendations for future research work.
使用工业废料作为建筑材料的工程混凝土混合物是迈向可持续发展和经济效益的巨大一步。制冷、汽车和建筑行业主要产生聚氨酯泡沫废料。大多数聚氨酯泡沫废料被倾倒在垃圾填埋场或进行焚烧，这会产生环境影响。聚氨酯泡沫废料由于其体积庞大、回收方法有限、运输成本高、化学成分复杂以及收集和处理基础设施不足等原因，回收利用具有挑战性。将废弃聚氨酯泡沫用作混凝土中的轻骨料具有双重目的：减少天然骨料的开采，并减少进入垃圾填埋场的聚氨酯泡沫废料。本文综述了废弃刚性聚氨酯泡沫作为混凝土混合物中的轻骨料的情况。首先，讨论了废弃柔性和刚性聚氨酯泡沫的统计数据分析、物理和微观结构特性。之后，介绍了通过坍落度试验对新拌性能进行的性能评估、通过抗压强度和密度对硬化性能进行的评估以及通过扫描电子显微镜进行的微观结构分析。研究得出结论，掺入废弃聚氨酯泡沫可提高工作性，改善聚氨酯泡沫骨料与胶凝基体之间的粘结，并降低轻质混凝土结构的混凝土密度和抗压强度。本文讨论了与传统混凝土相比，在混凝土中使用固体废料刚性聚氨酯泡沫的好处。本研究还确定了当前知识状态中的研究空白，并为未来的研究工作提供了一些建议。
