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Pro133

EFFECT OF CARBONATION ON RECYCLED CONCRETE AGGREGATES AND WATER ABSORPTION



Author(s): Marie SERENG, Assia DJERBI, Othman OMIKRINE METALSSI,
Patrick DANGLA, Jean-Michel TORRENTI
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: 156-166
Total Pages: 11
Language : English


Abstract: To reduce ecological impact of concrete, recarbonation allows uptaking CO2. Recycled
concrete aggregates (RCA), during their carbonation, can uptake CO2. Carbonation is
described also as a treatment for RCA, to improve water absorption.
The aim of this article is to develop a process of natural carbonation-treatment of RCA with
two different fractions 1-4 mm and 10-20 mm, to study the effect of granular fraction on CO2
uptake. The objective is also to compare the effect of natural and accelerated carbonation on
RCA, particularly improvement of water absorption coefficient.
The effect of accelerated carbonation and the effect of granular fraction on water content are
highlighted (3.8% of water content for 18.4 g/kg of CO2 uptake for RCA-NC-10.20 and 5.2%
for 16.3 g/kg of CO2 uptake for RCA-NC-1.4). Natural carbonation has an effect on accelerated
carbonation, because of the long storage of RCA after crushing. Natural carbonation
decreases water absorption coefficient by 53% for naturally carbonated RCA. Accelerated
carbonation decreases water absorption coefficient by 65% for RCA from naturally carbonated
RCA at the surface and has the best effect on water absorption of RCA than natural
carbonation.


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


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