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Net incremental indirect external benefit of manufacturing recycled aggregate concrete

Version 2 2024-06-04, 15:40
Version 1 2018-07-10, 10:07
journal contribution
posted on 2024-06-04, 15:40 authored by M Wijayasundara, P Mendis, RH Crawford
© 2018 Concrete waste (CW) either reaches landfill with mixed waste or crushed to produce crushed concrete (CC) used as a road-base product in Australia. The coarse portion of CC, referred to as recycled concrete aggregate (RCA) has the potential to be used as an aggregate in structural concrete replacing natural aggregate (NA). The environmental performance of RAC has been studied in comparison to NAC, in terms of direct environmental implications (DEI) concerning the processes in the production chain of these products. However, when replacement at industry level is considered, the implications go beyond the DEI, and affect a series of other products/processes within a system boundary, referred to as indirect environmental implications (IEI). This paper quantifies the key IEI associated with the use of RCA in structural concrete and evaluates the external costs and benefits associated with it using economic evaluation methods. The net benefit associated with the avoidance of landfill of CW, extraction of NA, and transportation of waste and by-products are the major externalities identified and quantified in this paper. Evaluation of these suggest that there is a significant net benefit ranging from 9% to 28% of the price of natural aggregate concrete (NAC) with the production of recycled aggregate concrete (RAC), for RCA replacement rates between 30% and 100%.

History

Journal

Waste management

Volume

78

Pagination

279-291

Location

Amsterdam, The Netherlands

ISSN

0956-053X

eISSN

1879-2456

Language

eng

Publication classification

C Journal article, C1.1 Refereed article in a scholarly journal

Copyright notice

2018, Elsevier

Publisher

Elsevier

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