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Arlin Bruno Tchamba
Institut für keramik, glas und Baustofftechnik, Technical University of Freiberg (Germany), Freiberg, Germany

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Original research paper
Published: 15 June 2021 in International Journal of Pavement Research and Technology
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In this study, the engineering characteristics of Portland cement samples (CM1, CM2, CM3 and CM4) from four manufacturers in Cameroon were evaluated to know their physical and mineralogical properties to be used in different environments. For this purpose, many analyses such as physical properties (setting time, consistency, compressive strength, flexural strength, water absorption and apparent density) and mineralogical properties (XRF and XRD) have been analysed. The results from XRF, XRD and with Bogu’s calculation revealed the predominance of alite (C3S) for CM1, alite–belite for CM2 and belite for CM3 and CM4. The initial setting time observed was 193 min for CM2 higher than CM1, CM4 and CM3 with respective initial setting time as 188 min, 178 min and 173 min. The normal consistency obtained was 0.34, 0.33, 0.31 and 0.30 W/C ratio, respectively, for CM2, CM1, CM4 and CM3. The compressive and flexural strength after 28 days for mortars were, respectively, 43.8 MPa and 4.8 MPa for CM4, 41.8 MPa and 4.8 MPa for CM3, 43.9 and 4.2 MPa for CM1, 41.4 MPa and 4.1 MPa for CM2. The water absorption and apparent density of mortars were, respectively, 2.35 wt% and 2.16 g/cm3 for CM1, 1.74 wt% and 2.18 g/cm3 for CM2, 1.8 wt% and 2.17 g/cm3 for CM3, 1.55 wt% and 2.19 g/cm3 for CM4. Results from the chemical composition show that, CM2 has a higher value of alumina which contributes to the reduction of humidity in the building and the high value of iron oxide might cause the corrosion of the armature in humid building environments. The alite cement CM1 and belite cement CM4 gives better mechanical strength in tropical region.

ACS Style

Linda Lekuna Duna; Nguimeya Nguepi Gide Audrey; Arlin Bruno Tchamba; Ndigui Billong; Elie Kamseu; Elsa Qoku; Thamer Salman Alomayri; Thomas A. Bier. Engineering and Mineralogical Properties of Portland Cement Used for Building and Road Construction in Cameroon. International Journal of Pavement Research and Technology 2021, 1 -14.

AMA Style

Linda Lekuna Duna, Nguimeya Nguepi Gide Audrey, Arlin Bruno Tchamba, Ndigui Billong, Elie Kamseu, Elsa Qoku, Thamer Salman Alomayri, Thomas A. Bier. Engineering and Mineralogical Properties of Portland Cement Used for Building and Road Construction in Cameroon. International Journal of Pavement Research and Technology. 2021; ():1-14.

Chicago/Turabian Style

Linda Lekuna Duna; Nguimeya Nguepi Gide Audrey; Arlin Bruno Tchamba; Ndigui Billong; Elie Kamseu; Elsa Qoku; Thamer Salman Alomayri; Thomas A. Bier. 2021. "Engineering and Mineralogical Properties of Portland Cement Used for Building and Road Construction in Cameroon." International Journal of Pavement Research and Technology , no. : 1-14.

Full length article
Published: 02 January 2021 in Journal of Asian Ceramic Societies
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The purpose of this study was to investigate the hot properties of low calcium dialuminate cement castable as binder with varying amount of Li2CO3 and castament FS20 superplasticizer as admixtures. Thermal damage test was carried out through quenching in air for five cycles ΔT = 1175°C. The samples were preheated at 1500°C for 2 h. The results gave a retained Young’s modulus of low-cement castable with 0.3 wt.% Li2CO3 and 0.5 wt.% castament down to 10.36% while 0.1 wt.% Li2CO3 and 0.5 wt.% castament showed a retained modulus down to 13.47%. For the samples without admixture, the loss of Young modulus was 92.4% and 93.7% with 0.3 wt.% of Li2CO3 admixture. The superplasticizer has a great effect on thermal shock resistance of low calcium dialuminate cement castable. The results confirmed that 0.1 wt%Li2CO3 and 0.5 wt% castament have better thermal shock resistance and longer service life for applications in refractories. The increase of mass of the refractory materials during five thermal shock cycles in air is the main factor affecting the degradation of this refractory material due to the oxidation of SiC to SiO2.

ACS Style

Arlin Bruno Tchamba; George Elambo Nkeng; Nangah Che Randy; Marcel Guidana; Ngouloure N M Zenabou; Yannick Tchedele Langollo; Daniel Ducho; Thomas A. Bier. Influence of lithium carbonate and superplasticizer as admixtures on low calcium dialuminate cement castable submitted to thermal shock. Journal of Asian Ceramic Societies 2021, 9, 404 -411.

AMA Style

Arlin Bruno Tchamba, George Elambo Nkeng, Nangah Che Randy, Marcel Guidana, Ngouloure N M Zenabou, Yannick Tchedele Langollo, Daniel Ducho, Thomas A. Bier. Influence of lithium carbonate and superplasticizer as admixtures on low calcium dialuminate cement castable submitted to thermal shock. Journal of Asian Ceramic Societies. 2021; 9 (1):404-411.

Chicago/Turabian Style

Arlin Bruno Tchamba; George Elambo Nkeng; Nangah Che Randy; Marcel Guidana; Ngouloure N M Zenabou; Yannick Tchedele Langollo; Daniel Ducho; Thomas A. Bier. 2021. "Influence of lithium carbonate and superplasticizer as admixtures on low calcium dialuminate cement castable submitted to thermal shock." Journal of Asian Ceramic Societies 9, no. 1: 404-411.

Research
Published: 28 May 2020 in Journal of the Australian Ceramic Society
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Processing of high calcined grade bauxite and metakaolin-based ceramic by unidirectional humid pressing using five formulation approaches have been studied. They include bauxite with high content of alumina Al2O3 > 86 wt% and metakaolin with silica content SiO2 > 56 wt%; the ceramic products obtained at 1500 °C present 65.9 to 26.8 MPa biaxial bending four points strength, respectively, for 0 wt% and 20 wt% of substitution of bauxite by metakaolin. The increase of metakaolin in bauxite favored the formation of cumulative pore volume from 63 to 145 ml/g for 0 wt% and 20 wt%, respectively. The decrease of linear shrinkage has been observed for 21.9 to 13.3%, respectively, for 0 wt% and 20 wt% of metakaolin. The SEM and EDS investigations show round grains of corundum and 3:2 mullite particles of about 10 μm; with 20 wt% of metakaolin in bauxite, grain of corundum and 3:2 mullite are corroded by the impurities like Ti, Fe, and K. The ceramic product obtained for 0 wt% has properties for high rigidity materials for structural application and the substituted one up to 20 wt% by metakaolin is favored for microfiltration.

ACS Style

Arlin Bruno Tchamba; Jeanne Solange Tankeu Ntchayi; Juvenal Giogetti Nemaleu Deutou; Marcel Guidana; Boubakar Likiby; Michel Mbessa. Influence of metakaolin from Mayouom, Cameroon, on the properties of high grade calcined bauxite sintered at 1500 °C. Journal of the Australian Ceramic Society 2020, 56, 1323 -1331.

AMA Style

Arlin Bruno Tchamba, Jeanne Solange Tankeu Ntchayi, Juvenal Giogetti Nemaleu Deutou, Marcel Guidana, Boubakar Likiby, Michel Mbessa. Influence of metakaolin from Mayouom, Cameroon, on the properties of high grade calcined bauxite sintered at 1500 °C. Journal of the Australian Ceramic Society. 2020; 56 (4):1323-1331.

Chicago/Turabian Style

Arlin Bruno Tchamba; Jeanne Solange Tankeu Ntchayi; Juvenal Giogetti Nemaleu Deutou; Marcel Guidana; Boubakar Likiby; Michel Mbessa. 2020. "Influence of metakaolin from Mayouom, Cameroon, on the properties of high grade calcined bauxite sintered at 1500 °C." Journal of the Australian Ceramic Society 56, no. 4: 1323-1331.

Articles
Published: 12 February 2020 in Journal of Asian Ceramic Societies
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The reactivity of calcium dialuminate CaAl4O7 refractory cement containing little amount of gehlenite Ca2Al2SiO7, belite Ca2SiO4, calcium aluminum iron oxide Ca3(Al,Fe)2O6 and calcium iron aluminum oxide Ca3.18Fe15.48Al1.34O28 was studied with and without Li2CO3. The granularity of the cement is d97 = 112.58 µm, d50 = 9.72 µm and d10 = 1.41 µm with water cement ratio W/C = 0.375. Little amount of Li2CO3 from 0.1wt.% to 0.6wt.% was added to the cement paste, and the result from calorimetry showed hydration mean peak time reduced from 17 h to 32 min and showed that the hydration heat of CA2 cement paste with Li2CO3 was 123 J/g lower than the one without Li2CO3 of 168 J/g. XRD of stabilized hydrates show that CaAl4O7 and Ca3(Al,Fe)2O6 participate in the hydration reaction to form C3AH6, AH3 and Ca3Al1.54Fe0.46(OH)12. The results from SEM images show nucleation site with plate-like crystal of CAH10 and small particles of AH3 forming a membrane on the cement surface.

ACS Style

Arlin Bruno Tchamba; Michel Mbessa; Tchedele Langollo Yannick; Sandra Waida; Antoine Elimbi; Uphie Chinje Melo; Thomas A. Bier. Reactivity of calcium dialuminate (CaAl4O7) refractory cement with lithium carbonate (Li2CO3) admixture. Journal of Asian Ceramic Societies 2020, 8, 223 -233.

AMA Style

Arlin Bruno Tchamba, Michel Mbessa, Tchedele Langollo Yannick, Sandra Waida, Antoine Elimbi, Uphie Chinje Melo, Thomas A. Bier. Reactivity of calcium dialuminate (CaAl4O7) refractory cement with lithium carbonate (Li2CO3) admixture. Journal of Asian Ceramic Societies. 2020; 8 (2):223-233.

Chicago/Turabian Style

Arlin Bruno Tchamba; Michel Mbessa; Tchedele Langollo Yannick; Sandra Waida; Antoine Elimbi; Uphie Chinje Melo; Thomas A. Bier. 2020. "Reactivity of calcium dialuminate (CaAl4O7) refractory cement with lithium carbonate (Li2CO3) admixture." Journal of Asian Ceramic Societies 8, no. 2: 223-233.

Original article
Published: 10 September 2019 in International Journal of Applied Ceramic Technology
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Thermal reactions of bauxite, kaolin, and talc compound were investigated at 1550°C to obtain high rigidity ceramic for ballistic applications. The compressed strength and density of the bauxite ceramics with kaolin and talc substitutions varied from 195 to 455 MPa and density from 2.85 to 4.05 g/cm3. The Young’s modulus varied from 107 GPa to 222 GPa with water absorption varying from 1.4 wt% to 5.9 wt% for 0 wt% and 15 wt% substitution of kaolin. The substitution of bauxite‐kaolin by talc up to 7.5 wt% contributes to the resorption of microporosity and increase the Young's modulus from 107 to 195 GPa. The XRD of bauxite ceramic with kaolin substitution showed the presence of corundum and mullite; whereas the XRD of bauxite ceramic with kaolin and talc substitution showed the presence of corundum, mullite, and spinel. The ballistic simulation with abaqus dassult SIMULA using the JH‐2 model predict that an impact with velocity of 525 to 810 m/s on the 10 mm thick bauxite ceramic does not erode or damage for a projectile consisting of tungsten alloy with dimensions: 12 mm in diameter, 61.5 mm length, and 72 g of mass. The bauxite ceramics can be used for ballistic applications.

ACS Style

Arlin Bruno Tchamba; Michel Mbessa; Jordan V. Sontia Metekong; Liuhua Yang; Solange Ntchayi Tankeu; George Elambo Nkeng; Daniele Njopwouo; Thomas A. Bier. Mechanical and microstructural properties of cameroonian bauxite ceramics for ballistic applications. International Journal of Applied Ceramic Technology 2019, 17, 949 -962.

AMA Style

Arlin Bruno Tchamba, Michel Mbessa, Jordan V. Sontia Metekong, Liuhua Yang, Solange Ntchayi Tankeu, George Elambo Nkeng, Daniele Njopwouo, Thomas A. Bier. Mechanical and microstructural properties of cameroonian bauxite ceramics for ballistic applications. International Journal of Applied Ceramic Technology. 2019; 17 (3):949-962.

Chicago/Turabian Style

Arlin Bruno Tchamba; Michel Mbessa; Jordan V. Sontia Metekong; Liuhua Yang; Solange Ntchayi Tankeu; George Elambo Nkeng; Daniele Njopwouo; Thomas A. Bier. 2019. "Mechanical and microstructural properties of cameroonian bauxite ceramics for ballistic applications." International Journal of Applied Ceramic Technology 17, no. 3: 949-962.

Journal article
Published: 25 August 2014 in Sustainability
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Two iron-rich clayey materials (L1 and L2, with the main difference being the level of iron accumulation) have been studied for their suitability as solid precursors for inorganic polymer composites. L1, with the lower iron content, was calcined at 700°C for 4 h and used as replacement, in the range of 15–35 wt%, for both raw laterites in the formulations of geopolymeric composites. The different mixtures were activated with a highly concentrated alkaline solution containing sodium hydroxide and sodium silicate. River sand with semi-crystalline structure was added to form semi-dry pastes which were pressed to appropriate shape. X-ray diffraction, Infrared spectroscopy, Scanning Electron Microscopy and Mercury Intrusion Porosimetry results demonstrated the effectiveness of the calcined fraction of L1 to act as nucleation sites and extend the geopolymerization to the matrix composites. A highly compact matrix with low porosity and good stability in water, together with a strength comparable to that of standard concretes was obtained allowing for conclusions to be made on the quality of laterites as promising solid precursor for sustainable, environmentally-friendly, and cost-efficient structural materials.

ACS Style

Esther A. Obonyo; Elie Kamseu; Patrick N. Lemougna; Arlin B. Tchamba; Uphie C. Melo; Cristina Leonelli. A Sustainable Approach for the Geopolymerization of Natural Iron-Rich Aluminosilicate Materials. Sustainability 2014, 6, 5535 -5553.

AMA Style

Esther A. Obonyo, Elie Kamseu, Patrick N. Lemougna, Arlin B. Tchamba, Uphie C. Melo, Cristina Leonelli. A Sustainable Approach for the Geopolymerization of Natural Iron-Rich Aluminosilicate Materials. Sustainability. 2014; 6 (9):5535-5553.

Chicago/Turabian Style

Esther A. Obonyo; Elie Kamseu; Patrick N. Lemougna; Arlin B. Tchamba; Uphie C. Melo; Cristina Leonelli. 2014. "A Sustainable Approach for the Geopolymerization of Natural Iron-Rich Aluminosilicate Materials." Sustainability 6, no. 9: 5535-5553.

Review
Published: 19 January 2011 in Sustainability
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Lateritic soils are formed in the tropics through weathering processes that favor the formation of iron, aluminum, manganese and titanium oxides. These processes break down silicate minerals into clay minerals such as kaolinite and illite. Iron and aluminum oxides are prominent in lateritic soils, and with the seasonal fluctuation of the water table, these oxides result in the reddish-brown color that is seen in lateritic soils. These soils have served for a long time as major and sub-base materials for the construction of most highways and walls of residential houses in tropical and sub-tropical countries of the world. Civil engineering applications of these lateritic soils are continually being developed with the use of different types of stabilizers. The stabilized soil-based products are as such viewed as environmentally-friendly and low-cost energy materials for sustainable building applications. This work aims at presenting a global view of what has been done in the field of lateritic soil improvement for construction purposes in tropical countries such as Cameroon. This shall be discussed through the presentation of the structure, composition and properties of lateritic soils, the various ways of improving their properties for construction purposes, the properties of products obtained and other prospects.

ACS Style

Patrick N. Lemougna; Uphie F. Chinje Melo; Elie Kamseu; Arlin B. Tchamba. Laterite Based Stabilized Products for Sustainable Building Applications in Tropical Countries: Review and Prospects for the Case of Cameroon. Sustainability 2011, 3, 293 -305.

AMA Style

Patrick N. Lemougna, Uphie F. Chinje Melo, Elie Kamseu, Arlin B. Tchamba. Laterite Based Stabilized Products for Sustainable Building Applications in Tropical Countries: Review and Prospects for the Case of Cameroon. Sustainability. 2011; 3 (1):293-305.

Chicago/Turabian Style

Patrick N. Lemougna; Uphie F. Chinje Melo; Elie Kamseu; Arlin B. Tchamba. 2011. "Laterite Based Stabilized Products for Sustainable Building Applications in Tropical Countries: Review and Prospects for the Case of Cameroon." Sustainability 3, no. 1: 293-305.