Group of Construction Research and Innovation (GRIC), Department of Project and Construction Engineering, Universitat Politècnica de Catalunya, C/ Colom, 11, Ed. TR5, 08222 Terrassa, Barcelona, Spain.
Group of Construction Research and Innovation (GRIC), Department of Project and Construction Engineering, Universitat Politècnica de Catalunya, C/ Colom, 11, Ed. TR5, 08222 Terrassa, Barcelona, Spain.
Waste Manag. 2022 May 1;144:387-400. doi: 10.1016/j.wasman.2022.04.008. Epub 2022 Apr 19.
Construction and demolition waste (CDW) is identified by multiple circular economy (CE) policies as a key sector for implementing circularity strategies due to the high volume of waste produced and the large consumption of raw materials. However, CE is not widely applied in the sector because of the lack of solid estimations on its environmental and economic viability. The main aim of this study was to propose a set of methodological steps to identify the optimal circularity alternatives for CDW products based on a multicriteria analysis of their environmental and economic performance. This methodology is applied to evaluate concrete waste. In specific, high-grade applications of concrete waste were analyzed comprising the processing into recycled coarse aggregates (RCA) for their use in structural and non-structural concrete. Multiple scenarios with different RCA replacements (20%, 30% and 100%) and different types of sorting and recycling (on-site and off-site) were evaluated in accordance with the specific site conditions of the region of Catalonia, Spain. The Life Cycle Analysis methodology (LCA) was used to perform the environmental analysis, while a detailed cost analysis was conducted for the economic aspect. The multicriteria method VIKOR was used for the selection of alternatives considering three different criteria. The results of this study showed environmental and economic advantages of CE scenarios based on the use of RCA over conventional concrete, mainly due to the influence of landfilling and transport distances. RCA produced on-site showed a better performance than RCA from fixed plants.
建筑和拆除废物 (CDW) 被多项循环经济 (CE) 政策确定为实施循环战略的关键领域，因为其产生的废物量很大，原材料消耗也很大。然而，由于缺乏对其环境和经济可行性的可靠估计，CE 在该领域并未得到广泛应用。本研究的主要目的是提出一套方法步骤，根据其环境和经济性能的多准则分析，确定 CDW 产品的最佳循环替代方案。该方法应用于评估混凝土废物。具体来说，分析了混凝土废物的高等级应用，包括将其加工成再生粗骨料 (RCA)，用于结构和非结构混凝土。根据西班牙加泰罗尼亚地区的具体场地条件，评估了不同 RCA 替代率（20%、30%和 100%）和不同分类和回收方式（现场和场外）的多个情景。生命周期分析方法 (LCA) 用于进行环境分析，而详细的成本分析用于经济方面。多准则方法 VIKOR 用于根据三个不同标准选择替代方案。本研究的结果表明，基于 RCA 替代传统混凝土的 CE 方案在环境和经济方面具有优势，主要是由于填埋和运输距离的影响。现场生产的 RCA 比固定工厂生产的 RCA 表现更好。
