Department of Civil Engineering, College of Engineering, American University of Sharjah, United Arab Emirates; Department of Construction Engineering and Projects Management, Al-Noor University College, Nineveh, Iraq.
Department of Civil Engineering, Central South University, Changsha, China.
Sci Total Environ. 2023 Jun 10;876:162804. doi: 10.1016/j.scitotenv.2023.162804. Epub 2023 Mar 11.
Recycling waste materials (WMs) is a cost-effective method for saving natural resources, protecting the environment, and reducing the use of high-carbon raw materials. This review aims to illustrate the impact of solid waste on the durability and microstructure of ultra-high performance concrete (UHPC) and to provide guidance for the research of eco-friendly UHPC. The results show that the proper use of solid waste to replace part of the binder or aggregate has a positive effect on the performance development of UHPC, but further enhancement techniques should be developed. When solid waste is prepared as a binder, the durability of waste based UHPC can be effectively improved by grinding and activation. When solid waste is used as an aggregate, its rough surface, potential reactivity and internal curing effect are also beneficial to the improvement of UHPC performance. Since UHPC has a dense microstructure, it can effectively prevent the leaching of harmful elements (heavy metal ions) in solid waste. However, the effect of waste modification on the reaction products of UHPC needs to be further studied, and design methods and testing standards suitable for eco-friendly UHPCs should be developed. The use of solid waste in UHPC effectively reduces the carbon footprint of the mixture, which is beneficial to the development of cleaner production technologies.
回收利用废物（WMs）是节约自然资源、保护环境和减少高碳原材料使用的一种经济有效的方法。本综述旨在说明固体废物对超高性能混凝土（UHPC）耐久性和微观结构的影响，并为环保型 UHPC 的研究提供指导。结果表明，适当利用固体废物替代部分胶凝材料或骨料，对 UHPC 的性能发展有积极影响，但需要开发进一步的增强技术。当固体废物作为胶凝材料制备时，通过研磨和激活可有效提高基于废物的 UHPC 的耐久性。当固体废物用作骨料时，其粗糙的表面、潜在的反应性和内部养护效果也有利于提高 UHPC 的性能。由于 UHPC 具有致密的微观结构，它可以有效地阻止固体废物中有害元素（重金属离子）的浸出。然而，废物改性对 UHPC 反应产物的影响仍需要进一步研究，并且应开发适用于环保型 UHPC 的设计方法和测试标准。在 UHPC 中使用固体废物可有效降低混合物的碳足迹，有利于清洁生产技术的发展。
