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Assessment of a microwave-assisted recycling process for the recovery of high-quality aggregates from concrete waste

Bru, Kathy and Touzé, Solène and Bourgeois, Florent and Lippiatt, Nicholas and Ménard, Yannick Assessment of a microwave-assisted recycling process for the recovery of high-quality aggregates from concrete waste. (2014) International Journal of Mineral Processing, vol. 126. pp. 90-98. ISSN 0301-7516

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Official URL: http://dx.doi.org/10.1016/j.minpro.2013.11.009

Abstract

This study presents an innovative method for concrete waste up-cycling based on concrete weakening through microwave heating before impact crushing. Two series of tests were conducted in order to assess the influence of the aggregate properties (size distribution, mineralogical nature) and the influence of the operating conditions of the microwave heating pretreatment on concrete fragmentation; and thus to evaluate the feasibility and the robustness of this process. Experiments were carried out on lab-made, cylindrical concrete specimens and on no-slump concrete waste with a multimode cavity microwave equipment (2.45 GHz, 6 kW) and an impact crusher. Results showed that microwave heating always induced an embrittlement of concrete samples which resulted in lower fracture energy, higher fragmentation of samples and higher liberation of aggregates (i.e. free of cement paste). A microwave-assisted comminution process is therefore an effective recycling technique for the recovery of high-quality aggregates from concrete waste.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The original PDF can be found at http://www.sciencedirect.com/science/article/pii/S0301751613002238
HAL Id:hal-00920886
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS (FRANCE)
French research institutions > Bureau de Recherches Géologiques et Minières - BRGM (FRANCE)
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Deposited By: Florent BOURGEOIS
Deposited On:19 Dec 2013 12:44

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