ST
Chargé de Cours
Activité scientifique
Profil chercheur
Enseignant-chercheur à l’Université de Yaoundé I. Grade : Chargé de Cours.
Publications scientifiques
John Takem Eyong, Alphonse Mbeng Wabi, Tehna Nathanael, Ariane Georgina Djampuop Njomou, Cédric Belinga Belinga
Journal of African Earth Sciences
Michel Bertrand Mbog, Gilbert François Ngôn Ngôn, Bernard Tassongwa, Tehna Nathanael, Vivien Percy Lotse Tedontsah, Jacques Étamé
Arabian Journal of Geosciences
Kankao Oumla Oumar, Ngon Ngon Gilbert François, Mbog Michel Bertrand, Tehna Nathanael, Bayiga Elie Constantin, Mbaï Joel Simon et 1 autre(s)
Applied Sciences
The sedimentary clays of the Douala sub-basin (Cameroon) were studied to determine their mineralogical composition and physicochemical properties to boost their potential suitability as materials for traditional ceramics and eventually modern ceramics. These clayey materials are not widely used locally as building materials and little data are available on these materials in the field of ceramics and they are relatively unknown. Three profiles from 3.9 to 7.4 m thickness were studied on the field in order to determine their mineralogical (X-ray diffraction, infrared), chemical (X-ray fluorescence) and physicochemical (particle size, Atterberg limits, organic matter, cation exchange capacity and hydrogen potential) properties. Globally, ten (10) clay samples were analyzed to highlight the nature and technological properties of these clays. Mineralogically, kaolinite (48.3–69.2 wt.%) and quartz (20.5–41.2 wt.%) were the most abundant minerals in these raw clay materials. They were associated with a very small or moderate quantity of illite, hematite, goethite, feldspar, gibbsite and micas. Geochemically, the clayey materials had high silica (SiO2, 22.21–58.03%) and alumina (Al2O3, 12.84–22.94%) contents, with a significant amount of iron oxides (Fe2O3, 1.07–17.92%). Other oxides (K2O, MgO, TiO2, Na2O, MnO, CaO and P2O5) were in a relatively lower proportion. A high level of alumina content explains the kaolinitic nature of these clayey materials. The results of the granulometric analysis of the clayey materials showed the following distribution: clay (26–99%) followed by silt (1–70%) and sand (0–4%). This corresponds to silty clay soils according to the Belgian textural classification diagram, with high plastic index (63.9%) characteristics. The studied clay materials are good candidates for the production of ceramics and terracotta building. This study is therefore important for any application of this type of clay in various industrial fields.
Jean Pierre Temga, Elisé Sababa, Lionelle Estelle Mamdem, Marie Louise Ngo Bijeck, Primus Tamfuh Azinwi, Tehna Nathanael et 5 autre(s)
Geoderma Regional
Kankao Oumar Oumla, Ngon Ngon Gilbert François, Tehna Nathanael, Bayiga Elie Constantin, Mbog Michel Bertrand, Mbaï Joel Simon et 1 autre(s)
Journal of Geosciences and Geomatics
This study is focused on the physicochemical and mineralogical characterization of five different clay materials of Eastern part of Douala sub-basin. It aims to know the nature and geotechnological properties of the clay raw materials in order to raise the idea of their potentialities in industrial applications. The samples were subjected to several analyses such as geotechnical tests notably the particle size distribution, the Atterberg limits, the swelling index, the chemical (cation exchange capacity, pH-H2O and pH-KCl, X-ray fluorescence) and mineralogical (X-ray diffraction) analyses. These clay materials showed high fine fractions (up to 99%) and high plasticity index (15 to 63%). The swelling index is medium (16 to 20) and the CEC moderate (30 - 40), indicating the presence of a small proportion of swelling 2:1 type clays. The clay materials are predominantly constituted by kaolinite (32 â 72%), quartz (20.2 - 50.7%) and illite (4.6 â 10%), which are characteristic of the sedimentary environment and morphoclimatic conditions of the Douala coastal sedimentary sub-basin. The predominant oxides in clay materials are SiO2 (34.05 - 51.18%) and Al2O3 (16.05 - 23.98%). Iron oxide Fe2O3 is moderate (1.55 - 11.22%) and alkali and alkaline earth oxides are weak less than 2%. The physicochemical parameters associated with mineralogical and geochemical data make them suitable for ceramic applications and also serve as backfilling materials in building constructions when improved by adding sand.
Profil chercheur
Publications scientifiques
1 publication
3 publications
1 publication
Collaborations
