Work

Cross-country life cycle assessment of construction and demolition waste recycling with evaluation of energy use, carbon emissions, and regional trade-offs

Year: 2025

Type: article

Abstract: Recycling construction and demolition waste (C&DW) into recycled concrete aggregates (RCA) is a sustainable strategy to reduce resource consumption and emissions. Most life cycle assessments (LCAs) focus on a single country and region, limiting broader applicability. This study conducts a novel comparative LCA of C&DW recycling systems across six countries and regions. By evaluating energy consumption, global warming potential (GWP), and fossil CO 2 emissions in recycled concrete aggregate (RCA) production, significant regional differences are revealed, largely influenced by infrastructure, processing efficiency, and transport. In countries with mature recycling systems, RCA production reduces GWP by up to 97% per ton compared to natural aggregates manufacturing. Conversely, longer transport distances or inefficient operations in less developed systems can offset these benefits. While RCA generally demonstrates lower environmental impacts, its advantage is highly context-dependent. However, standardized global guidelines remain challenging due to regional disparities in waste sources and processing.

Source: Scientific Reports

DOI: 10.1038/s41598-025-25387-5

Authors: Seyyed Ahmad Hosseini, Vahid Asghari, Xiaoyi Liu, Shu-Chien Hsu, Chi-Sun Poon

Institution: Hong Kong Polytechnic University

Language: English

Topic: Recycled Aggregate Concrete Performance

Subfield: Building and Construction

Field: Engineering

Domain: Physical Sciences

SDGs: Responsible consumption and production, Climate action

Open Access status: gold

Estimated APC paid: $2,690