Co-benefits of urban concrete recycling on the mitigation of greenhouse gas emissions and land use change : A case in Chongqing metropolis, China

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

9 Scopus Citations
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Author(s)

  • Chunbo Zhang
  • Mingming Hu
  • Pengcheng Xiang
  • Qian Zhang
  • Jiangbo Wu
  • Bo Li
  • Shiying Shi

Detail(s)

Original languageEnglish
Pages (from-to)481-498
Journal / PublicationJournal of Cleaner Production
Volume201
Online published1 Aug 2018
Publication statusPublished - 10 Nov 2018
Externally publishedYes

Abstract

Rapid urbanization drives massive construction, which, in return, leads to ever increasing urban metabolism challenges on the provision of raw materials, as well as the disposal of construction and demolition waste. Due to its large volume, the transporting and processing of these materials cause considerable greenhouse gas emissions and land use change. With this circumstance, shortening the supply chains of urban construction by efficient recycling of construction and demolition waste becomes a frontier field for the circular transition of cities. It is particularly important in current China, where the concrete recycling is still rare. This paper aims to map the opportunities and potentials of concrete recycling on the mitigation of greenhouse gas emissions and land use change, with an integrated material flow analysis and life cycle assessment for the case study city – Chongqing, China. For the baseline year 2015, four scenarios representing various recycling routes in Chongqing have been explored: (1) improving brick manufacturing; (2) recycling on-site for road base filling; (3) recycling aggregate for prefabricated concrete component and (4) recycling concrete aggregate for structure use. Results highlighted that different technological routes have different potentials to increase recycling rates but all generate co-benefits on greenhouse gases mitigation and land transformation reduction. Recycling of stony construction and demolition waste for high value concrete aggregate has the biggest potential to bring the co-benefits on greenhouse gases mitigation and land use reduction. Besides, on-site recycling for road-base aggregates also presents a high performance, especially on greenhouse gases mitigation in transport. Based on the sensitivity analysis, policy implications were discussed, highlighting the necessity of to develop the recycling routes that substitute primary gravel with aggregates recycled from the stony waste; unlocking the existing recycling capacity and restricting landfilling.

Research Area(s)

  • Construction and demolition waste, Greenhouse gas, Land use change, Life cycle assessment, Material flow analysis, Urban concrete recycling

Citation Format(s)

Co-benefits of urban concrete recycling on the mitigation of greenhouse gas emissions and land use change : A case in Chongqing metropolis, China. / Zhang, Chunbo; Hu, Mingming; Dong, Liang; Xiang, Pengcheng; Zhang, Qian; Wu, Jiangbo; Li, Bo; Shi, Shiying.

In: Journal of Cleaner Production, Vol. 201, 10.11.2018, p. 481-498.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal