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Geosciences 2018, 8(9), 342; https://doi.org/10.3390/geosciences8090342

Waste Concrete Valorization; Aggregates and Mineral Carbonation Feedstock Production

1
Institut National de la Recherche Scientifique (Centre Eau, Terre et Environnement), Université du Québec, 490 rue de la Couronne, Québec, QC G1K 9A9, Canada
2
COREM, 180, rue de la Minéralogie, Québec, QC G1N 1X7, Canada
*
Author to whom correspondence should be addressed.
Received: 20 July 2018 / Revised: 27 August 2018 / Accepted: 3 September 2018 / Published: 11 September 2018
(This article belongs to the Special Issue Carbon Sequestration)
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Abstract

Concrete is a major constituent of our world. Its contributes to building society but is also an important contributor to the global CO2 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 CO2. 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 CO2 following previously optimized conditions. Different S/L ratios were experimented. The results show that 110 kg of CO2 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. View Full-Text
Keywords: waste concrete; aggregates recycling; aqueous mineral carbonation; technico-economic evaluation waste concrete; aggregates recycling; aqueous mineral carbonation; technico-economic evaluation
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Pasquier, L.-C.; Kemache, N.; Mocellin, J.; Blais, J.-F.; Mercier, G. Waste Concrete Valorization; Aggregates and Mineral Carbonation Feedstock Production. Geosciences 2018, 8, 342.

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