CSIR-Structural Engineering Research Center, Chennai, 600113, Tamilnadu, India.
IISc, Bengaluru, 600080, Karnataka, India.
Environ Sci Pollut Res Int. 2022 Sep;29(42):62870-62886. doi: 10.1007/s11356-022-21720-x. Epub 2022 Jul 13.
Owing to the depletion of natural resources, new alternative materials are emerging in construction industry. Especially, development of alternative binders and aggregates using industrial by-products paves way for the development of eco-friendly concrete. As aggregates occupy about 60-70% of the volume of concrete, new alternative materials developed as a substitute for aggregates are considered as need of the day for achieving sustainability in concrete industry. In the past few decades, many industrial by-products are researched as an alternative for natural aggregates. Ash being the largely produced by-products from different industries, it has huge potential in the development of artificial aggregates. Nevertheless, ashes produced from different sources such as coal, municipal solid waste and biomass have different characteristics and affect the properties of aggregates made out of them. The volume of research works reported on development of ash aggregates all over the globe shows that there is a faster growth rate in the development of alternative aggregates and its utilization in concrete. In this context, the current study aims to review the literature reported on mortar/concrete made of ash aggregates from various sources such as thermal power stations, biomass and municipal solid waste incinerator. The characteristics of different types of ash, development of aggregate and its properties in mortar/concrete are reviewed. Based on the review, future recommendations and directions are provided to utilize more of ash aggregates in the place of natural aggregates to prevent depletion of natural resources.
由于自然资源的枯竭，建筑行业中出现了新的替代材料。特别是，利用工业副产品开发替代粘结剂和骨料为开发环保型混凝土铺平了道路。由于骨料占混凝土体积的 60-70%左右，因此开发替代骨料的新材料被认为是实现混凝土行业可持续发展的当务之急。在过去几十年中，许多工业副产品已被研究用作天然骨料的替代品。灰分是不同行业产生的主要副产品，因此在人工骨料的开发方面具有巨大的潜力。然而，来自不同来源的灰分，如煤、城市固体废物和生物质，具有不同的特性，并影响由其制成的骨料的性能。全球范围内报道的关于灰分骨料开发的研究工作数量表明，替代骨料的开发及其在混凝土中的应用正在快速增长。在这种情况下，本研究旨在综述来自热电厂、生物质和城市固体废物焚烧炉等各种来源的灰分骨料制成的砂浆/混凝土的文献。综述了不同类型灰分的特性、骨料的开发及其在砂浆/混凝土中的性能。根据综述，提供了未来的建议和方向，以利用更多的灰分骨料替代天然骨料，防止自然资源枯竭。
