LCA of Self-Compacting Concrete Incorporating Waste Plastic Fibre, Recycled Aggregate and SCMs
摘要
This study intends to conduct an in-depth life cycle assessment (LCA) and life cost analysis (LCCA) of waste plastic fiber (WPF) reinforced sustainable recycled aggregate self-compacting concrete (WPF-RSCC). A sustainable self-compacting concrete (SCC) was manufactured by recycling of waste concrete, industrial waste, and waste plastic. This paper assessed the advantages of the addition of waste plastic fiber (WPF), recycled coarse aggregate (RCA) and supplementary cementitious materials (SCMs) on the environmental impact and economic cost of SCC. 10 WPF reinforced recycled aggregate SCC (WPF-RA-SCC) mixtures were prepared by substantially replacing natural aggregates and cement with RCAs and SCMs, respectively. The environmental and economic impacts of WPF-RA-SCC were quantified using Life cycle assessment and life cycle cost analysis. The VIKOR MCDA method was deployed to identify the optimal concrete mixture by integrating fresh and hardened properties, environmental and economic performance. The research findings indicate that combined addition of RCAs, SCMs and WPF offered considerable advantages on environmental and economic performance, by reducing the environmental load and economic cost up to 73.9% and 34.7%, respectively. Quaternary RA-SCC comprising 1.0% WPF and 75% SCMs using a combination type was recognized by the MCDA as the optimized mix, which exhibited superior mechanical properties, low environmental impacts and economic cost. This study proposed a novel approach for prioritizing sustainable materials selection, thus facilitating the recycling of waste concrete, waste plastic and industrial by-products.