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High-temperature, resistant, argillite-based, alkali-activated materials with improved post-thermal treatment mechanical strength

Tohoue Monique Tognonvi, Svetlana Petlitckaia, Ameni Gharzouni, Myriam Fricheteau, Nathalie Texier-Mandoki, Xavier Bourbon and Sylvie Rossignol
High-temperature, resistant, argillite-based, alkali-activated materials with improved post-thermal treatment mechanical strength
Clays and Clay Minerals (June 2020) 68 (3): 211-219

Abstract

Fire resistance performance is one of the most important requirements in geological storage conditions in order to improve the resistance of storage packages to high thermal constraints (in the case of a fire for example). With the need to develop new fire-resistant materials, the aim of the present study was to develop fire-resistant geopolymer binders based on Callovo-Oxfordian (COx) argillite. Two types of kaolin with different degrees of purity were mixed with argillite in various proportions. These mixtures were calcined at 600 or 750 degrees C. In order to assess the fire resistance of activated materials, thermal treatment at 1000 degrees C was performed. The compressive strength and mineralogical composition of the samples were investigated before and after heat treatment. The results showed that the addition of argillite improved significantly the thermomechanical properties of kaolin-based geopolymers containing impurities, especially the mixture containing 67% argillite and calcined at 750 degrees C. This phenomenon was not observed for the pure-kaolin geopolymer. Improvement of fire resistance was due to the formation in situ of leucite and zeolite-type phases (KAlSi (sub 2) O (sub 6) and KAlSiO (sub 4) ) and of wollastonite (CaSiO (sub 3) ) at high temperature, which is linked to the Ca available in the raw materials.


ISSN: 0009-8604
EISSN: 1552-8367
Coden: CLCMAB
Serial Title: Clays and Clay Minerals
Serial Volume: 68
Serial Issue: 3
Title: High-temperature, resistant, argillite-based, alkali-activated materials with improved post-thermal treatment mechanical strength
Affiliation: Universite Peleforo Gon Coulibaly, Unite de Formation et de Recherche des Sciences Biologiques, Korhogo, Cote d'Ivoire
Pages: 211-219
Published: 202006
Text Language: English
Publisher: Clay Minerals Society, Chantilly, VA, United States
References: 38
Accession Number: 2024-077861
Categories: Sedimentary petrologyGeochemistry of rocks, soils, and sediments
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table
Secondary Affiliation: Institut de Recherche sur les Ceramiques, FRA, FranceAgence Nationale pour la Gestion des Dechets Radioactifs, FRA, France
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2024, American Geosciences Institute. Abstract, Copyright, Clay Minerals Society. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 2024

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