Reusing Geopolymer Waste from Matrices Based on Metakaolin or Fly Ash for the Manufacture of New Binder Geopolymeric Matrices

Rabii Hattaf, Abdelilah Aboulayt, Azzedine Samdi, Nouha Lahlou, Mohamed Ouazzani Touhami, Moussa Gomina and Redouane Moussa
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Rabii Hattaf: Laboratory of Physics and Chemistry of Inorganic Materials, Faculty of Sciences Aïn Chock, University Hassan II Casablanca, Casablanca 53306, Morocco
Abdelilah Aboulayt: Laboratory of Physics and Chemistry of Inorganic Materials, Faculty of Sciences Aïn Chock, University Hassan II Casablanca, Casablanca 53306, Morocco
Azzedine Samdi: Laboratory of Physics and Chemistry of Inorganic Materials, Faculty of Sciences Aïn Chock, University Hassan II Casablanca, Casablanca 53306, Morocco
Nouha Lahlou: Laboratory of Mechanics, Faculty of Sciences Aïn Chock, University Hassan II Casablanca, Casablanca 53306, Morocco
Mohamed Ouazzani Touhami: Laboratory of Mechanics, Faculty of Sciences Aïn Chock, University Hassan II Casablanca, Casablanca 53306, Morocco
Moussa Gomina: CRISMAT UMR6508 CNRS, ENSICAEN, 6 boulevard Maréchal Juin, CEDEX 4, 14050 Caen, France
Redouane Moussa: Laboratory of Physics and Chemistry of Inorganic Materials, Faculty of Sciences Aïn Chock, University Hassan II Casablanca, Casablanca 53306, Morocco

Sustainability, 2021, vol. 13, issue 14, 1-20

Abstract: The increasing use of geopolymer materials in the construction and civil engineering sectors generates a large amount of non-biodegradable waste that will end up in landfills. It is therefore necessary to anticipate solutions for the proper management of this waste. In this work, new geopolymer materials were fabricated by partially replacing the reactive raw minerals (fly ash, FA, or metakaolin, MK) with used geopolymers (fully fly ash-based, FAref, or metakaolin-based, MKref), in order to develop a strategy to reuse geopolymer waste. Their workability and setting behavior were studied in the fresh state, and the geopolymerization process was investigated by calorimetry and by electrochemistry. Mechanical properties and the ability for coating mineral aggregates were assessed, and the resulting adhesion properties were analyzed using matrix/sand mortars. It appears that the new geopolymer materials as well as the mortars are endowed with good performances. The compressive strengths are above 50 MPa and therefore meet the requirements of different construction materials. This demonstrates the recyclability of geopolymer materials. Moreover, an analysis of the influence of the substitution of recycled geopolymers on the setting and on the mechanical performances of mortars makes it possible to propose a binder-recycled geopolymer interaction model for the formation of new binding matrices.

Keywords: recycling; fly ash; metakaolin; waste; geopolymerization; mechanical characterization; binder-recycled geopolymer model (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2021
References: View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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