ENVIRONMENTAL ANALYSIS OF RECYCLED AGGREGATES CONCRETE CONSIDERING SOME WAYS TO IMPROVE THEIR IMPACT: A CASE STUDY OF PARIS’ REGION

Author(s): R. Idir, A. Ben Fraj
Paper category: Proceedings
Book title: CO2STO2019 - International Workshop CO2 Storage in Concrete
Editor(s): Assia Djerbi, Othman Omikrine-Metalssi, Teddy Fen-Chong
ISBN:
e-ISBN: 978-2-35158-232-9
Publisher: RILEM Publications SARL
Publication year: 2019
Pages: 46-55
Total Pages: 10
Language : English

Abstract: This study aims at assessing the environmental footprint of recycled aggregates concrete
(RAC), compared to natural aggregate one (NAC), considering the grade of used recycled
aggregates (RA), their capacity of CO2 storing and the aggregates’ delivery distance, at the
scale of Paris’ region.
From a practical viewpoint, the footprint of RAC can be limited by using high-grade RA, which
results in less added cement to compensate for the decrease of compressive strength.
From an environmental viewpoint, some ways to improve the footprint of RA and RAC are
discussed. In particular, the waste indicator is reduced by considering the valorization of trivial
industrial waste. The global warming indicator is also decreased when considering the CO2
storing capacity of RA. Furthermore, the delivery distance of natural aggregates (NA) is the
key parameter in assessing the environmental impacts of RAC, compared to NAC. Results
show that global warming indicator impact is greater for NAC, compared to RAC with 50% of
RA, provided that NA delivery distance exceeds 50 km, which is the case in Paris’ region. This
distance is drastically reduced when considering the CO2 uptake by RA carbonation.

Online publication : 2019
Publication type : full_text
Public price (Euros) : 0.00