自然灾害和人类拆迁造成了大量的建筑和拆迁废物(CDW),很大一部分是混凝土废料。对于资源有限的发展中国家来说,管理这种混凝土废物是一项艰巨的挑战,旨在减轻其对环境的有害影响。因此,拟议的方法涉及使用再生细骨料(RFA)代替混凝土中的新鲜细骨料(FFA),这与实现可持续环境目标密切相关。进行了广泛的实验室测试以评估向混凝土中添加RFA的效果。研究了0~100%RFA置换和不同养护时间对抗压强度的影响,抗拉强度,抗氯离子渗透和化学品暴露,和骨料的质量。所以,30%左右,35%,20%,压缩强度降低79%,抗拉强度,弹性模量,在再生骨料混凝土(RAC)中使用100%RFA时,估算了可加工性。然而,根据结果分析,在建议的条件和配合比设计中,RAC的性能可靠到RFA的50%。此外,主要环境影响,如全球变暖潜力,水生富营养化,水生酸化减少了47%,40%,18%,分别,对于具有50%RFA的混凝土比具有100%FFA的混凝土。
Natural disasters and human demolition create vast amounts of construction and demolition waste (CDW), with a substantial portion being concrete waste. Managing this concrete waste is a daunting challenge for developing countries with limited resources, aiming to mitigate its harmful environmental effects. Therefore, the proposed approach involves using recycled fine aggregates (RFA) instead of fresh fine aggregates (FFA) in concrete, which aligns closely with achieving sustainable environmental objectives. Extensive laboratory tests were conducted to assess the effects of adding RFA to concrete. The influence of 0 to 100% RFA replacement and different curing times was investigated on compressive strength, tensile strength, resistance against chloride ion penetration and chemicals exposure, and quality of aggregates. So, around 30%, 35%, 20%, and 79% reductions in compression strength, tensile strength, modulus of elasticity, and workability were estimated when 100% RFA was used in recycled aggregate concrete (RAC). However, according to results analyses, the performance of RAC is reliable up to 50% of RFA in proposed conditions and mix design. In addition, major environmental impacts such as global warming potential, aquatic eutrophication, and aquatic acidification were reduced by 47%, 40%, and 18%, respectively, for concrete having 50% RFA than concrete having 100% FFA.