Title:
Investigation of the CO2 Sequestration by Accelerated Carbonation as a Function of the Composition, Origin, Production Process, and Age of Recycled Concrete Aggregates
Author(s):
Sandrine Braymand and Sébastien Roux
Publication:
Symposium Paper
Volume:
362
Issue:
Appears on pages(s):
953-965
Keywords:
accelerated carbonation, calcimetry, CO₂ capture, parent concrete, RCA
DOI:
10.14359/51742021
Date:
6/18/2024
Abstract:
Accelerated carbonation of recycled concrete aggregates (RCA) is one way to convert them into carbon stores by capturing CO2 from cement plants. This study investigates the CO2 captured depending on composition (paste, mortar, or concrete), origin (laboratory, platform), production process (crushing, molding, sawing), and age of RCA. The CO2 captured is quantified by means of calcimetry (CaCO3 content evolution). RCA studied ranged in size from 4 to 16 mm (0.16 to 0.63 in.). They were carbonated on a laboratory or semi-industrial scale. It has been shown that the CaCO3 content of young RCA or RCA protected from natural carbonation, crushed and composed of CEMI is more likely to evolve. It was shown that the cement paste content and the duration of accelerated carbonation increase the amount of CO2 captured. The composition of the parent aggregates affects the non-carbonated and carbonated CaCO3 contents, which requires accurate sampling to limit bias in the results. Carbonation efficiency is more difficult to estimate on a semi-industrial scale and the assessment by calcimetric measurement is biased when the parent concrete is made of slag-based cement. The study was carried out within the framework of the French national program FastCarb.
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