Peng Ying, Cai Shenruowen, Huang Yutao, Chen Xue-Fei
School of Civil Engineering, Putian University, Putian 351100, China.
Engineering Research Center of Disaster Prevention and Mitigation of Southeast Coastal Engineering Structures (JDGC03), Fujian Province University, Putian 351100, China.
Materials (Basel). 2025 Jun 25;18(13):3013. doi: 10.3390/ma18133013.
The transformative trajectory of urban development in the contemporary era has engendered a substantial escalation in construction waste generation, particularly in China, where it constitutes approximately 40% of the total solid waste stream. Traditional landfill disposal methodologies pose formidable ecological challenges, encompassing soil contamination, groundwater pollution, and significant greenhouse gas emissions. Furthermore, the unsustainable exploitation of natural sandstone resources undermines energy security and disrupts ecological balance. In response to these pressing issues, an array of scholars and researchers have embarked on an exploratory endeavor to devise innovative strategies for the valorization of construction waste. Among these strategies, the conversion of waste into recycled aggregates has emerged as a particularly promising pathway. However, the practical deployment of recycled aggregates within the construction industry is impeded by their inherent physico-mechanical properties, such as heightened water absorption capacity and diminished compressive strength. To surmount these obstacles, a multitude of enhancement techniques, spanning physical, chemical, and thermal treatments, have been devised and refined. This paper undertakes a comprehensive examination of the historical evolution, recycling methodologies, and enhancement strategies pertinent to recycled aggregates. It critically evaluates the efficacy, cost-benefit analyses, and environmental ramifications of these techniques, while elucidating the microstructural and physicochemical disparities between recycled and natural aggregates. Furthermore, it identifies pivotal research gaps and prospective avenues for future inquiry, underscoring the imperative for collaborative endeavors aimed at developing cost-effective and environmentally benign enhancement techniques that adhere to the stringent standards of contemporary construction practices, thereby addressing the intertwined challenges of waste management and resource scarcity.
当代城市发展的转型轨迹导致建筑垃圾产生量大幅增加，尤其是在中国，建筑垃圾约占固体废物流总量的40%。传统的填埋处置方法带来了严峻的生态挑战，包括土壤污染、地下水污染以及大量温室气体排放。此外，对天然砂岩资源的不可持续开采破坏了能源安全并扰乱了生态平衡。为应对这些紧迫问题，众多学者和研究人员已着手进行探索性努力，以设计建筑垃圾资源化的创新策略。在这些策略中，将废物转化为再生骨料已成为一条特别有前景的途径。然而，再生骨料在建筑行业中的实际应用受到其固有物理力学性能的阻碍，如吸水率增加和抗压强度降低。为克服这些障碍，人们设计并完善了多种增强技术，包括物理、化学和热处理。本文对与再生骨料相关的历史演变、回收方法和增强策略进行了全面考察。它批判性地评估了这些技术的功效、成本效益分析和环境影响，同时阐明了再生骨料与天然骨料之间的微观结构和物理化学差异。此外，它还确定了关键的研究差距和未来研究的潜在途径，强调了开展合作努力的必要性，旨在开发符合当代建筑实践严格标准的具有成本效益和环境友好的增强技术，从而应对废物管理和资源稀缺这两个相互交织的挑战。
