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Typology of Local Construction Materials from the Adamawa and North-West Regions of Cameroon

Geomaterials 2016年第2期6卷 50-59页

作者： Zo’o Zame Philémon nzeukou nzeugang aubin Uphie Chinje Melo Mache Jacques Richard Ndifor Divine Azigui Nni Jean Department of Earth Sciences University of Yaoundé Yaoundé Cameroon Local Materials Promotion Authority (MIPROMALO) Yaoundé Cameroon National Civil Engineering Laboratory (LABOGENIE) Yaoundé Cameroon

This article summarizes the different local construction materials observed in two regions of Cameroon (Adamawa and North-West). These raw materials were mapped and evaluated using various methods of investigation (spatial distribution, estimation of reserves, development of a database compatible with geo-referenced maps). The results obtained show three types of local construction materials (vegetal, pedological and geological) with quantitative estimation or distribution. Vegetal local materials include herbaceous savanna with strong dominance of straw in Adamawa region than the North West region. Pedological local construction materials include lateritic soils (ferruginous or clayey), harplan, sandy clay and sandy clay soil while geological local construction materials include volcanic, plutonic and metamorphic rocks. Many sites of these geological materials are suitable for the rock quarry plant. Adamawa region also contains sedimentary rocks constituted by metamorphic conglomerate and sandstones. Two main types of residential homes are constructed with these local construction materials in these regions of Cameroon. These include huts and houses.

关键词： Local Construction Materials Typology Adamawa and North-West Regions Cameroon

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Identification of major sources controlling groundwater geochemistry in Mount Makabaï in the Far-North of Cameroon(the northernmost part of the Pan-African Belt)

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Acta Geochimica 2023年第2期42卷 266-289页

作者： Merlin GountiéDedzo DésiréTsozué Amidou Kpoumié aubin nzeugang nzeukou Department of Life and Earth Sciences Higher Teachers’Training CollegeUniversity of MarouaP.O.Box.55MarouaCameroon Department of Earth Sciences Faculty of ScienceUniversity of MarouaP.O.Box.814MarouaCameroon

The present work focuses on the volcanic basement rock geochemistry of Mount Makabaï(MarouaCameroon city)in relation to groundwater *** were centered on an approach involving an association of several methods such as geological cartography,hydrogeology,and *** rock samples,four disturbed soil samples,three undisturbed soil samples,and 20 samples of groundwater in 10 wells were collected during fieldwork and prepared for laboratory *** exhibit porphyritic,aphyric,and subaphiric *** phenocryst phases are mainly olivine,clinopyroxene,and *** on whole rock major element chemical compositions,the Makabaï samples,plotted on Na_(2)O+K_(2)O versus SiO_(2)diagram,are mugearite,hawaiite,and *** ratio of(MgO+CaO)/(Na_(2)O+K_(2)O)exceeds unity and shows dominance of alkaline Earth metals(MgO:2.99-4.48%;CaO:6.19-9.80%)relatively to alkali metals(Na_(2)O:2.27-4.46%;K_(2)O:2.09-2.51%).Exchangeable base contents are high,mostly represented by Ca and Mg,whose contents vary from 14.6 to 35.28 cmol(+)kg^(-1)and from 3.28 to9.48 cmol(+)kg^(-1)*** CECclayis likewise high,fluctuating between 116.80 and181.38 cmol(+)kg^(-1),values in line with the presence of 2:1 clay minerals represented in the study area by *** the water samples,the Ca2+and Na+contents are generally higher than K^(+)and Mg^(2+),reflecting the relative abundance of Na_(2)O and CaO oxides to K_(2)O and MgO oxides in rocks where different waters were *** waters of Makabaï are acidic to neutral(6.3≤pH≤7.4)and weakly to highly mineralized(110.0≤EC≤1190.0μS/cm).Hydro-geochemical classification by using the Piper diagram revealed two water types:(1)CaMg-HCO_(3)(40%)and(2)CaMg-Cl or CaMg-SO4(60%).The average content of ions in all the analyzed samples was HCO_(3)^(-)>>NO_(3)^(-)>SO_(4)^(2-)>Cl-for anions and Ca^(2+)>>Mg^(2+)>Na^(+)>K^(+)for *** mechanisms governing ionic constituents of groundwater in

关键词： Mount Makabaï-Maroua city Far-North Cameroon Bedrock minerals Groundwater-rock-soil interaction Crystalline basement

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Industrial Potentiality of Alluvial Clays Deposits from Cameroon: Influence of Lateritic Clayey Admixture for Fired Bricks Production

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Journal of Minerals and Materials Characterization and Engineering 2013年第5期1卷 236-244页

作者： aubin nzeugang nzeukou Véronique Kabeyene Kamgang Robert Eko Medjo Uphie Chinje Melo André Njoya Patrick Ninla Lemougna Nathalie Fagel Laboratory of Alterology and Engineering Geology Yaounde Cameroun Laboratory of Clays Geochemistry and Sedimentary Environments (AGEs) Boulevard du Rectorat 17 (Bat. B18) Sart Tilman University of Liege Liège Belgium Local Materials Promotion Authority (Mipromalo) Yaounde Cameroun

The cartography and characterization of an alluvial clay deposit from Ebebda (Central region of Cameroon) were carried out in order to assess its suitability for the production of fired clay bricks. The clayey area investigated is ~ 50,000 m2 with an average thickness of the exploitable layer of 2.2 m, suggesting a deposit of about ~2.2 × 105 tonnes of clay. Mineralogy, physico-chemical and thermal analyses as well as firing properties were performed on representative clay samples. Kaolinite and quartz are the major minerals associated to illite. Upon heating to 900℃ - 1200℃, the linear shrinkage varies from 1.5% to 15%, the water absorption from 1.5% to 24% and the bending strength from 2 to 12 MPa. The admixture of lateritic clays (widely available) at 50%, 60%, 70% and 80% allow to decrease the shrinkage and bending strength, and to increase the water absorption. Overall, properties were satisfying the requirement for fired brick with 70% of laterite in the mixture.

关键词： Alluvial Clay Deposit Characterization Lateritic Clay Admixture Brick Cameroon

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