Inventaire des Ressources en Argiles du Gabon et leurs Utilisations Conventionnelles ou non dans les régions de Libreville et de Tchibanga

Abstract : Materials and clayey minerals abound in the Gabon. The pioneers works reveal the presence of red clays in the barrémian series of Agoula and red clays with violets in the neocomian series of Ndombo. Clays constitute a precious and plentiful resource which was widely beneficiated as well in traditional constructions of green clays as in terra-cotta in diverse places of the country. The present researches aim at inventorying the resources in various clays easily accessible in Gabon, and in the study of selection of deposits with application potential, according to the nature of clays. This work is carried on in the regions of Libreville and Tchibanga. The collected samples are the object of macroscopic, microscopic (tiny), chemical, structural and superficial analyses. Trials of formulation are the object of applications in the domains of bricks, tiles and refractories. The population growth of the Gabonese Republic generates a demand in diverse local materials satisfying the needs for the current life. The emphasis is put on the applications concerning terra-cottas: bricks, roof tiles and floor tiles. Zones of interest with economic potential are identified. Clays of the region of Libreville, rich in kaolinites and illite are interesting for applications in terra-cotta. The characterization of the mineralogical properties of the clayey rocks is realized with the aim of identifying the most interesting industrial uses. Characterizations and tests of applications, identify raw materials for the construction, the ceramic, but also in many other domains as pharmacology (galenic), paper industry, cosmetics, food-processing industry, rubber, paint, civil engineering and environment engineering. As in all the countries of Central Africa, the sustainable development passes inevitably by a control of the local resources. The fine characterization of clays of the Cretaceous of Libreville is realized by: X-ray Diffraction, Fourier transform infrared spectroscopy, scanning electronic microscopy, determination of the cation exchange capacity, particle size analysis, chemical analyses, plasticity index, ceramic tests. According to the X-ray diffraction, these clays are mixtures of kaolinite, and/or illite and montmorillonite, quartz, ± muscovite, ± microcline, ± hematite, ± rutile ± anatase. The observation in Scanning Electron Microscopy and the treatment with Ethylène Glycol or heating at 550°C in XRD confirms the dominating presence of these minerals
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Jean-Eudes Boulingui. Inventaire des Ressources en Argiles du Gabon et leurs Utilisations Conventionnelles ou non dans les régions de Libreville et de Tchibanga. Autre. Université de Lorraine, 2015. Français. ⟨NNT : 2015LORR0309⟩. ⟨tel-01752267⟩

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