Carbon footprint of block prepared with recycled aggregate: a case study in China

14th International Conference on Concrete Engineering and Technology

Liu, Yi^1 ; Hossain, Md. Uzzal^2 ; Ling, Tung-Chai^1

Key Lab. for Gn. and Adv. Civil Engineering Materials and Application Technology of Hunan Province, College of Civil Engineering, Hunan University, Changsha, Hunan

410082, China^1

Department of Civil Engineering, University of Hong Kong, Pokfulam Road, Hong Kong, Hong Kong^2

关键词: Changsha cities;    Construction and demolition;    Current situation;    GHGs emissions;    Life Cycle Inventory;    Mechanical requirements;    Natural aggregate;    Recycled aggregates;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/431/3/032009/pdf
DOI  :  10.1088/1757-899X/431/3/032009

来源: IOP

【 摘 要 】

This study aims to evaluate the carbon footprint of concrete blocks prepared with local recycled waste materials derived from Changsha using life cycle assessment (LCA) technique. The local life cycle inventory was developed for conducting case-specific assessment of concrete blocks prepared with recycled aggregates (RA) sourced from a local construction and demolition (C&D) waste. The result is also compared with concrete blocks made by natural aggregates (NA). The results show that greenhouse gases (GHGs) emissions related to the production of RA were 3 kg CO2 eq., which is 57% lower than the production of NA. However, the adoption of RA in concrete blocks production induced higher GHGs emissions than NA concrete blocks due to higher amount of cement was needed to achieve a same required mechanical strength. Guidelines to further design and develop sustainable green concrete blocks prepared with RA to meet the mechanical requirements based on the current situation in Changsha city has also been highlighted.