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Formulation of Geopolymer Cements from Two Clays Containing Kaolinite and Muscovite: Effect of Temperature on the Physicomechanical Properties of the Products

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Journal of Materials Science and Chemical Engineering 2023年第12期11卷 34-45页

作者： Mamadou Yaya Balde Diaka Sidibe Éric Severin Simo Bakam Chantale Djangang Njiomou philippe blanchart Laboratory of Applied Inorganic Chemistry University of Yaoundé 1 Yaoundé Cameroon Laboratory of Physical and Colloidal Chemistry Gamal Abdel Nasser University of Conakry Conakry Guinée Center for Waste Management Research (CREGED) Conakry Guinea Higher Institute of Mines and Geology of Boké (ISMGB) Boké Guinea Institute of Research for Ceramics (IRCER) Limoges France

The paper talks about the elaboration of geopolymer with two types of kaolinite clays containing muscovite. The kaolinite materials were first calcined at different temperatures, and mixed with an activator solution, called liquid precursor, at a different solid/liquid mass ratio depending on their normal consistency to produce geopolymer binders. Results show that the geopolymer products obtained from the different clays have good physichomechanical properties: their open porosity and their water absorption rate decrease while their compressive strength and their apparent density increase with the increase in calcination temperature of the clays. The density of GABD binders varies between 2.92 and 2.47 g/cm3 and that of GARD binders between 1.86 and 2.16 g/cm3. Specimens in the GABD series have the best mechanical performance, ranging from 14.43 to 31.37 MPa, while those in the GARD series oscillate between 6.18 and 11.56 MPa. These properties make kaolinite materials from this region suitable for use as construction materials for adequate waterproof structures.

关键词： Geopolymer Cements Kaolinitic Clays Muscovite Permeability Mechanical Strength

Optimization of Contents of Three Raw Clay Materials in Formulation of a Porcelain

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Journal of Materials Science and Chemical Engineering 2022年第1期10卷 41-58页

作者： Youssouf Sawadogo Moustapha Sawadogo Moussa Ouédraogo Mohamed Seynou Gisèle Lecomte-Nana philippe blanchart Moussa Gomina Lamine Zerbo Laboratory of Molecular Chemistry and Materials (LC2M) University Joseph KI-ZERBO Burkina Faso Institute of Research in Ceramic (IRCER) UMR-CNRS European Ceramic Center Limoges France Laboratory of Cristallography and Material Sciences (CRISMAT) UMR National Graduate School of Engineering of Caen (ENSICAEN) Caen France

Formulation of traditional hard porcelain generally requires 50% kaolin, 25% silica and 25% feldspar. Four porcelains formulation using the casting method, were prepared with different percentages of kaolinitic clay, sand and pegmatite referenced respectively NONG, SAB and PEG. The physico-chemical, mechanical and mineralogical characteristics were evaluated on specimens formulated and sintered at different temperatures from 1200˚C to 1300˚C. X-ray diffraction has revealed the presence of mullite and quartz as essentially crystalline phases. The specimen formulated with 55% NONG, 25% PEG and 20% SAB and sintered at 1240˚C gives better performance (water absorption: 0.17%, density: 2.42, open porosity: 0.42% and flexural strength: 53.54 MPa).

关键词： Raw Minerals Porcelain Characterization Chemical Durability and Phase Transformations

Physicochemical Characterisation for Potential Uses as Industrial Mineral of Bauxite from Débélé, Guinea

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Journal of Materials Science and Chemical Engineering 2021年第3期9卷 9-22页

作者： Mamadou Yaya Balde Chantale Njiomou Djangang Ramatoulaye Binta Diallo philippe blanchart Daniel Njopwouo Department of Inorganic Chemistry University of Yaounde I Yaounde Cameroon Department of Chemistry University Gamal Abdel Nasser of Conakry Conakry Guinea Institute of Research for Ceramics—IRCER Limoges France

Assessing the potential uses as industrial mineral, bauxite from Débélé, Guinea, has been characterised by chemical and mineralogical analyses, the determination of the amorphous content, the rate of portlandite consumption in an aqueous solution, the strength activity index, and the thermal behaviour up to 1200°C. It was evidenced that the raw sample is gibbsite-rich type bauxite with about 45.06 wt% of alumina, 23.80 wt% of iron oxide, and 1.74 wt% of silica. It meets the chemical composition required for bauxites used for refractory cement. During heating, the raw bauxite undergoes high densification with low linear shrinkage, motivating a potential use in dense ceramic compositions with high thermal stability. Also, the heating at only 600°C gives a significant pozzolanic activity in combination with Portland cement. The correlation between the pozzolanicity, the amorphous phase content, and the specific surface area indicated that the raw and the calcined materials present an interesting reactivity for using them in alternative cement formulations.

关键词： Bauxite Characteristics Industrial Mineral Guinea

Net-Shape Clay Ceramics with Glass Waste Additive

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Materials Sciences and Applications 2014年第8期5卷 592-602页

作者： Chantale Njiomou Djangang Elie Kamseu Antoine Elimbi Gisèle Laure Lecomte philippe blanchart Department of Inorganic Chemistry University of Yaounde I Yaounde Cameroon Department of Engineering “Enzo Ferrari” University of Modena and Reggio Emilia Modena Italy LAM Local Materials Promotion Authority/MIPROMALO Yaounde Cameroon GEMH ENSCI Limoges France

In this paper, a glass powder from waste containers was mixed (10 - 40 wt.%) with a kaolinitic sandy clay from Cameroon to elaborate net-shape ceramics, fired at 1100°C. The sintering behavior was from dilatometry and thermo gravimetric analyses together with the characterization of porosity and flexural strength. The increase of glass to kaolinite ratio reduces the sintering shrinkage leading to a none-densification sintering when 40 wt.% of glass is added in the mixture. The volume variation during the whole firing process is from the individual volume variations during the quartz transformation, the structural reorganization of kaolinite and during sintering. Quartz size and relative quantity have a significant role on the first processes since it leads to either cohesive or un-cohesive behavior. But the glass quantity strongly controls the second and the third thermal processes because glass additions change the recrystallization processes, leading to the formation of dense clay-glass agglomerates distributed within the three dimensional quartz network.

关键词： Clay Waste Glass Powder Sintering Composite Cameroon

Usability of a Natural Tuff as Admixture in Clinker and Its Influence on the Physico-Chemical and Mechanical Properties of Mortar

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Journal of Minerals and Materials Characterization and Engineering 2021年第5期9卷 480-498页

作者： Lamine Zerbo Moustapha Sawadogo Youssouf Sawadogo Salfo Salogo Moussa Ouedrago Mohamed Seynou Gisèle Lecomte-Nana philippe blanchart Laboratoire de Chimie Moléculaire et des Matériaux (LC2M) University Joseph Ki-Zerbo Ouagadougou Burkina Faso Centre Européen de la Céramique Limoges France

The mechanical and physical properties of TUFF from Korsimoro (Burkina Faso) were investigated for use as admixtures in clinker to make pozzolanic cement. Six different cement mortar specimens were prepared by replacing clinker with TUFF in ratios of 0%, 5%, 8%, 10%, 13% and 15% by mass. The flexural and compressive strengths of the specimens were determined at the ages of 2, 7, 28 and 60 days. The effects of the TUFF replacement ratio on workability, setting time and volume expansion were also examined. Based on the results, it was concluded that Korsimoro TUFF has pozzolanic activity and is suitable for use as an alternative adherent material in the cement industry.

关键词： Pozzolan Tuff Admixture Cement Mortar