Properties of low temperature belite cements made from aluminosilicate wastes by hydrothermal method - INSA Toulouse - Institut National des Sciences Appliquées de Toulouse Access content directly
Journal Articles Cement and Concrete Composites Year : 2014

Properties of low temperature belite cements made from aluminosilicate wastes by hydrothermal method

Abstract

The aim of this study is the synthesis at low temperature (1000 degrees C) of reactive belite cement, rich in reactive C2S phases (alpha'(L) and/or beta-C2S), starting from aluminosilicate wastes (oil well drilling mud and hydraulic dam sludge) and hydraulic lime dust recovered from bagging workshops. A hydrothermal treatment of the raw cement mixture was performed in an alkaline solution of KOH (0.6 M), with heating at 100 degrees C for 4 h under atmospheric pressure and continuous agitation. The burning of the hydrothermal mixture at 1000 degrees C produced reactive belite cements containing between 79% and 86% of C2S (alpha'L and/or beta polymorphs), the rest being C(12)A(7) (5-8%), C(4)AF (7-11%) and free lime (2%). The cements were characterized by X-ray Fluorescence (XRF), X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), microprobe, and laser granulometry. The hardening evolution of belite cement pastes and mortars was followed by thermo-gravimetric analysis (TGA), setting time and compressive strength. The results showed a rapid production of hydrates (C-S-H/C-A-S-H, calcium aluminate hydrates and portlandite), with a fast setting time (reaction of C(12)A(7)) and compressive strength evolution that led to these cements being classified in the 32.5 category according to EN 197-1. (c) 2014 Elsevier Ltd. All rights reserved.
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hal-01850771 , version 1 (27-07-2018)

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W. Mazouzi, L. Kacimi, Martin Cyr, Pierre Clastres. Properties of low temperature belite cements made from aluminosilicate wastes by hydrothermal method. Cement and Concrete Composites, 2014, 53, pp.170--177. ⟨10.1016/j.cemconcomp.2014.07.001⟩. ⟨hal-01850771⟩
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