Abstract：
This paper presents an overview of the scholarly works employing the life cycle assessment (LCA) approach to evaluate the environmental impact of construction and demolition waste (CDW) fine fractions derived from concrete elements throughout their life cycle. Unlike conventional studies, this work addresses the challenge of reducing the carbon footprint associated with CDW-based building materials, emphasizing environmental impact mitigation. The study highlights that approximately 30% of CDW is landfilled, 50% is recycled, and 20% is used as fill material, underscoring the potential for increasing recycling rates through improved processing techniques and management practices. In the reviewed studies, most research has been conducted in Europe, Asia, the USA, and China. The primary and secondary data sources for the life cycle inventory (LCI) vary depending on the study region and locality. By exploring innovative practices and critical stages in CDW fine fractions utilization for concrete components, the study aims to contribute to greener construction practices and sustainable resource management. The distinctive aspect of this research lies in its comprehensive review of CDW-based aggregates, binders, and alternative cementitious materials, highlighting the significance of sustainable energy resources and transportation strategies in enhancing the sustainability of CDW-derived concrete. Key findings highlight the necessity of sustainable energy for pretreatment and optimized transportation strategies, including route planning and vehicle selection, to produce greener CDW fine fraction-based building materials. Additionally, the study suggests key steps and parameters required for defining the system boundary and preparing the inventory for conducting an LCA of building materials based on CDW fine fractions. Through a detailed analysis of environmental burdens at each production stage, this study seeks to promote the adoption of greener concrete solutions worldwide. The use of CDW in concrete production promotes environmental sustainability and greener concrete regardless of the region.
摘要：
本文概述了采用生命周期评估（LCA）方法来评估建筑和拆除废物（CDW）在整个生命周期中从混凝土元素中提取的细粒对环境的影响的学术著作。与传统研究不同，这项工作解决了减少与基于CDW的建筑材料相关的碳足迹的挑战，强调减轻环境影响。该研究强调，大约30%的CDW被填埋，50%被回收利用,20%用作填充材料，强调通过改进加工技术和管理实践来提高回收率的潜力。在审查的研究中，大多数研究都是在欧洲进行的，亚洲,美国,和中国。生命周期清单（LCI）的主要和次要数据源因研究区域和地区而异。通过探索混凝土构件CDW细粒利用的创新实践和关键阶段，这项研究旨在促进绿色建筑实践和可持续的资源管理。这项研究的独特之处在于对基于CDW的骨料的全面审查，活页夹,和替代胶凝材料，强调可持续能源资源和运输战略在增强CDW衍生混凝土可持续性方面的重要性。主要发现强调了可持续能源预处理和优化运输策略的必要性，包括路线规划和车辆选择，生产更绿色的CDW细级分建筑材料。此外,该研究提出了定义系统边界和准备库存所需的关键步骤和参数，以进行基于CDW细粒的建筑材料LCA。通过对各生产阶段环境负担的详细分析,这项研究旨在促进全球采用更绿色的具体解决方案。无论在哪个地区，CDW在混凝土生产中的使用都可以促进环境可持续性和绿色混凝土。
