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Comparative Study on Geopolymer Binders Based on Two Alkaline Solutions (NaOH and KOH)

Journal of Minerals and Materials Characterization and Engineering 2020年第6期8卷 407-420页

作者： Seick Omar Sore Adamah Messan Elodie Prud’Homme gilles escadeillas François Tsobnang Université Nazi BONI (UNB) Bobo-Dioulasso Burkina Faso Institut International d’ingénierie de l’Eau et de l’Environnement (2iE) Laboratoire Eco-Matériaux et Habitats Durables (LEMHaD) Rue de la Science Ouagadougou Burkina Faso Université de Lyon Matériaux: Ingénierie et Science (MATEIS) INSA Lyon Villeurbanne France Université de Toulouse (UPS INSA) LMDC (Laboratoire Matériaux et Durabilité des Constructions) Toulouse France

This study specifically investigated the influence of the composition of aluminosilicate material i.e. the substitution of metakaolin by rice husk ash and the nature of alkaline activators (Na+/K+) on mineralogical, structural, physical and mechanical properties of geopolymer binders. This influence was evaluated based on X-ray diffraction (XRD), Fourier Transform InfraRed spectroscopy (FTIR) and Scanning Electron Microscope (SEM analyses, apparent density, water accessible porosity, compressive strength and thermal properties. Two types of geopolymer binder were synthesized according to the type of alkali activator used, the NaOH-based geopolymer and the KOH-based geopolymer. The results of characterization performed after 14 days of curing of geopolymer samples showed that the activation of the aluminosilicate powder using alkaline solution led to change in their microstructure. The highest compressive strength was obtained with the NaOH-based geopolymer.

关键词： Geopolymer NaOH KOH Metakaolin Rice Husk Ash Compressive Strength

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Characterization of Peanut Shells for Their Valorization in Earth Brick

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Journal of Minerals and Materials Characterization and Engineering 2020年第4期8卷 301-315页

作者： Ouanmini Bobet Sory Nassio Mohamed Seynou Bakiono Remy Lamine Zerbo Issiaka Sanou Moustapha Sawadogo Younoussa Millogo escadeillas gilles University Joseph KI-ZERBO UFR-SEA Ouagadougou Burkina Faso University Nazi BONI UFR-ST Bobo-Dioulasso Burkina Faso Laboratoire Matériaux et Durabilité des Constructions (LMDC) Université de Toulouse UPS INSA Toulouse France

Peanut shells from Burkina Faso were characterized using mineralogical, microstructural and chemical methods to perform its possibility to be used as reinforce in adobe bricks. It consists of cellulose (48 wt%), hemicellulose (3 wt%) and lignin (28 wt%). The peanut shells were characterized by high porosity and showed water absorption around 198% at 72 hours. Its chemical composition is essentially composed of silica, iron oxides, alumina and calcium oxide. Its microstructure showed that the peanut shells were a compilation of microfibers with high porous of borders. In watery solution, the peanut shells released polyphenols. Thermal conductivity of peanut at 25 °C was 0.155 ± 0.021 W/mK. The physico-chemical characteristics of peanut shells were similar to those found with agricultural by-products used in adobe reinforce.

关键词： Agricultural Wastes Peanut Shells Thermal Conductivity Adobes Durability

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