A comparative study of the compressive strengths and microstructural properties of geopolymer cements from metakaolin an
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ORIGINAL ARTICLE
A comparative study of the compressive strengths and microstructural properties of geopolymer cements from metakaolin and waste fired brick as aluminosilicate sources Hamed I. Riyap1 · Charles Banenzoué3 · Hervé Kouamo Tchakouté1,2 · Charles N. P. Nanseu1 · Claus H. Rüscher2 Received: 1 July 2020 / Revised: 2 October 2020 / Accepted: 28 October 2020 © The Korean Ceramic Society 2020
Abstract The main target of this work is to compare the compressive strengths and the microstructural properties geopolymer cements from waste fired brick as low-value aluminosilicate-rich waste and metakaolin. The chemical reagent used in this investigation is a sodium waterglass from rice husk ash. The obtained results show that waste fired brick contains a higher amount of SiO2 (60.98 wt%). The quartz content in the waste fired brick, standard and local metakaolins was estimated at approximately 8, 2 and 8 wt%, respectively. The X-ray patterns of these aluminosilicates indicate the broad hump structure between 15 and 35° (2θ) corresponding to the amorphous aluminosilicate phase. Besides this amorphous phase, waste fired brick shows the broad bands of hematite at 33.29 and 35.87° (2θ) indicating that some Al is replaced by Fe in IV-fold coordination. The micrographs of metakaolins show the platy-shaped with coarse-grain particles and the one of waste fired bricks indicates the platy- and spherical-shaped with smaller particle sizes. The compressive strength values of geopolymer cements from local and standard metakaolins are 40.32 and 44.46 MPa, respectively. Whereas the one from waste fired brick is 47.82 MPa. It was found that waste fired brick could be used as an alternative low-value aluminosilicate-rich waste for producing geopolymer cements with high compressive strength. Keywords Waste fired brick · Metakaolin · Rice husk ash · Chemical reagent · Geopolymer cements · Compressive strength
1 Introduction Geopolymer cement is an inorganic polymer network of mineral molecules linked by covalent bonds. A large number of studies have been carried out in the field of geopolymers. Several researchers prepared geopolymers using metakaolin, volcanic ash, fly ash, ground blast furnace slag, and so on. Some authors used waste fired brick as raw material for producing geopolymer cement. For example, Reig et al. [1] investigated the properties and the microstructure of * Hervé Kouamo Tchakouté [email protected]; [email protected] 1
Department of Inorganic Chemistry, Laboratory of Analytical Chemistry, Faculty of Science, University of Yaounde I, P.O. Box 812, Yaounde, Cameroon
2
Institut Für Mineralogie, Leibniz Universität Hannover, Callinstrasse 3, 30167 Hannover, Germany
3
The University of Douala, Faculty of Science, P.O. Box 24157, Douala, Cameroon
alkali-activated red clay brick waste. These authors study the influence of type and concentration of hardener (commercial sodium waterglass) on the mechanical strength and microstructure of the final products. They reported that the the type and co
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