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ACCELERATED CARBONATION OF COARSE AGGREGATES BY USING A ROTATING SYSTEM IN ORDER TO IMPROVE ITS PROPERTIES



Author(s): G. S. Dos Reis, B. G. Cazacliu, R. Artoni, J-m. Torrenti, J. Rosquoët, C. H. Sampaio
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: 99-108
Total Pages: 10
Language : English


Abstract: In this work, an accelerated carbonation method called “rotating carbonation” is applied to
improve the physical chemical properties of recycled aggregates aiming to produce secondary
aggregates for civil engineering applications; moreover, the ability of such aggregates in
storing CO2 through the rotating carbonation is explored and evaluated. The carbonation tests
were carried out in a laboratory scale rotation carbonation equipped with an airproof reactor
with CO2 feeding system. Before and after the rotating carbonation process, the physical
properties of the recycled aggregate, including water absorption and density were determined.
As results, the carbonation process reduced the water absorption and enhanced the enveloped
density of the aggregates. The shape of the recycled aggregate was significantly rounded by
the shearing. The rotating speed, moisture content and size of the aggregates played a good
influenced on the mass increasing by aggregates. For the rotating carbonation, at 100rpm, the
gain of mass were 45.0 and 39.0 mg/g for 8/10 and 10/20mm particle sizes, respectively, while
for the static mode (0rpm) the amount uptaken was 4.9 mg/g at the same conditions. The
results showed that the rotating carbonation process is very suitable method for CO2 storage
presenting very high carbonation efficiency.


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


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