Mineralogical, geochemical and mechanical characterization of the Ayos (East-Cameroon) lateritic and alluvial clayey mixtures: Suitability for building application

Ntouala, Roger Firmin Donald; Onana, Vincent Laurent; Kamgang, Véronique; Ekodeck, Georges Emmanuel

doi:10.1016/j.jobe.2015.11.007

Cited by 12 publications

(15 citation statements)

References 17 publications

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“…The parameters studied show the impact of the addition of alluvial clays with a low Fe 2 O 3 content on these lateritic clays. The same trends are observed with the mixtures of Yaounde [5], Ayos [6] and Monatele-Ebebda [7]. All this allows to conjecture these results to the equatorial zone.…”

Section: Physical and Mechanical Characterizationsupporting

confidence: 78%

“…WA values are most influenced by temperature than alluvial clay content of the mixture. The same pattern is observed with of Ayos clayey mixtures [6]. Low drops in water absorption values in all samples are usually due to the absence or very low development of a vitreous phase [20,25].…”

Section: Physical and Mechanical Characterizationsupporting

confidence: 65%

“…Because kaolinite and gibbsite are present, SiO 2 is followed by Al 2 O 3 (12.00-23.23%). The content of Fe 2 O 3 (3.76-11.58%) can result in poor mechanical strength of the final products [2][3][4][5][6][7]. Alkali and alkali-earth oxides persist in very low proportions (≤ 1.55%) which may result in inadequate sintering during firing due to poor formation of the vitreous phase.…”

Section: Mineralogy and Geochemistrymentioning

confidence: 99%

“…Among them, Andji et al [2] proposed the addition of calcium clay (10 wt% CaCO 3 ) to significantly improve the mechanical strength of Gounioubé clays (Ivory Coast), while Ergul et al [8] proposed the substitution of clayey materials by basaltic tuffs. The approach of lateritic and alluvial clay mixtures has also been addressed in Cameroon by Ngon Ngon et al [5] and Ntouala et al [6]; Onana et al [7]. Six lateritic clay samples have been collected and analyzed in the area of Sa'a.…”

Section: Introductionmentioning

confidence: 99%

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Mineralogy, geochemistry and physico-mechanical characterization of clay mixtures from Sa’a (Center Cameroon): possibly use as construction materials

et al. 2020

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Six lateritic clay samples and lateritic and alluvial clay mixtures were studied in order to evaluate their potential use as raw material for bricks and tiles manufacturing. Their mineralogical and geochemical compositions were determined by X-ray diffraction and X-ray spectrometry, respectively, together with some physico-mechanical characteristics. The main minerals for the raw materials are kaolinite, quartz, goethite, hematite, and muscovite. Fluxing oxides are in low proportion (≤ 1.55 wt%) and causes insufficient sintering during firing. The flexural strength (FS) values are lower than 2 MPa for lateritic clay bricks, due to the Fe 2 O 3 content. This justifies their amendment with alluvial clays from the near Sanaga River. The lateritic and alluvial clay mixtures were done with respectively 100, 80, 60, 40, and 0 wt% of lateritic clay and fired at 900, 950, 1000, 1050, and 1100 °C. Linear shrinkage values increase with temperature and globally with alluvial clay content. Except for one sample-based product at 900 and 950 °C, water absorption values overall remain lower than 20% which is adequate for dense bricks and roofing tiles. For the mixtures, FS values globally increase with alluvial clay content except for a few samples at some temperatures. The studied clay mixtures can be used for bricks manufacture at the five tested temperatures. Some compositions with 40, 60, and 100 wt% of alluvial clays may be used for the production of roofing tiles above 1000 °C. Fluxes amendment is needed at 1050 and 1100 °C for other mixtures to increase their FS.

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Section: Physical and Mechanical Characterizationsupporting

confidence: 78%

Section: Physical and Mechanical Characterizationsupporting

confidence: 65%

Section: Mineralogy and Geochemistrymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Mineralogy, geochemistry and physico-mechanical characterization of clay mixtures from Sa’a (Center Cameroon): possibly use as construction materials

et al. 2020

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“…Clayey materials rich in iron content and lack of fluxing oxides have been suggested to exhibit poor mechanical resistance to compressive test thus not suitable as masonry units (Mahmoudi et al, 2008). Mechanical resistance and durability of burnt brick are considered to improve as thermal conductivity, strength and fluxing materials increases while the water absorption rate remains minimal (Ntouala et al, 2016;Fadil-Djenabou et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Geotechnical evaluation of clayey materials for quality burnt bricks

Akintola

Amponsah-Dacosta

Mhlongo

2020

Heliyon

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Understanding of clayey materials properties continues to elude brick manufacturers, hence unsure of their application for brick making purposes. The raw materials were assessed geochemically, mineralogically, physically and technologically. The geochemical result showed that the fluxing oxides K 2 O, N 2 O, CaO, MgO and MnO are generally low in content with average abundance ranging from 0.06% to 1.78%. The Fe 2 O 3 content varies (4.8-25.5%) thus reflects heterogenous stability in tonality. Most of the studied samples have relatively high Al 2 O 3 content which suggest the bauxitic composition from which kaolinite minerals might have resulted from. The XRD analysis revealed the presence of kaolinite and chlorite as the major clay minerals while quartz, feldspar, talc and hornblende were present as non-clay minerals. For DTA, the threshold of new crystallization processes were attained at 1000 C. The SEM analysis revealed the presence of some stroma in all samples although with sizes >50 nm. These pores were suggested to constitute a capillary system where molten mineral occupy as temperature increases. The Atterberg's limit indicated that the studied materials are inorganic silts with high compressibility and organic clays properties since it plotted below the A-line of plasticity chart. The compressive strength (CS) for brick specimens made from kaolinite-rich material are relatively higher than chlorite-rich specimens. This was attributed to the ineffective pore connection within the kaolinite interstitial particles compared to the chlorite-rich specimen, hence increasing the density. The water absorption (WA) test on twenty brick specimens showed that the pore volume and capillarity for bricks which are chlorite-dominated were comparatively higher, thus absorbing more water molecules. These results revealed that majority of the studied clayey material are not suitable for double storey construction bricks but meet the requirements for single-storey construction when compared with SANS standards.

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Characterization and potential application of gleysols and ferralsols for ceramic industry: a case study from Dimako (Eastern Cameroon)

et al. 2020

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Mineralogical, geochemical and mechanical characterization of the Ayos (East-Cameroon) lateritic and alluvial clayey mixtures: Suitability for building application

Cited by 12 publications

References 17 publications

Mineralogy, geochemistry and physico-mechanical characterization of clay mixtures from Sa’a (Center Cameroon): possibly use as construction materials

Mineralogy, geochemistry and physico-mechanical characterization of clay mixtures from Sa’a (Center Cameroon): possibly use as construction materials

Geotechnical evaluation of clayey materials for quality burnt bricks

Characterization and potential application of gleysols and ferralsols for ceramic industry: a case study from Dimako (Eastern Cameroon)

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