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Waste Concrete Valorization; Aggregates and Mineral Carbonation Feedstock Production.

Authors :
Pasquier, Louis-César
Kemache, Nassima
Mocellin, Julien
Blais, Jean-François
Mercier, Guy
Source :
Geosciences (2076-3263); Sep2018, Vol. 8 Issue 9, p342, 12p
Publication Year :
2018

Abstract

Concrete is a major constituent of our world. Its contributes to building society but is also an important contributor to the global CO<subscript>2</subscript> emissions. The combination of waste concrete recycling and greenhouse gas abatement is obviously an interesting approach. Mineral carbonation is the methodology that allows the use of calcium oxide within the concrete and transform it into carbonates with the CO<subscript>2</subscript>. Following previous results, carbonation experiments were performed using concrete paste extracted from a waste concrete sample after aggregate separation. The latter was performed after crushing and attrition followed by sieving to obtain three fractions. The coarser one composed of aggregates, the second of sand and the last, a fine powder of waste concrete paste (MCF). The MCF is then used in carbonation experiments in an 18.7 L stirred reactor with a diluted source of CO<subscript>2</subscript> following previously optimized conditions. Different S/L ratios were experimented. The results show that 110 kg of CO<subscript>2</subscript> can be stored per ton of MCF obtained after separation. Using the mass balance obtained from the experiments, an economic evaluation was performed on both aggregate separation and carbonation. While the first step can be profitable, using the MCF as a material for industrial flue gas abatement is less evident, both on the applicability and the feasibility. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
20763263
Volume :
8
Issue :
9
Database :
Complementary Index
Journal :
Geosciences (2076-3263)
Publication Type :
Academic Journal
Accession number :
131950951
Full Text :
https://doi.org/10.3390/geosciences8090342