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Geotechnical Characterization of Termite Mound Soils of Congo

Open Journal of Civil Engineering 2022年第3期12卷 370-389页

作者： Louis Ahouet Mondésire Odilon Ngoulou Sylvain Ndinga Okina sorel dzaba Higher Institute of Architecture Urbanism Building and Public Works Denis Sassou Nguesso University Brazzaville Congo Laboratory of Materials and Energies (LME) Faculty of Sciences and Technics Marien Ngouabi University Brazzaville Congo Higher Polytechnic National School (ENSP) Marien Ngouabi University Brazzaville Congo Building and Publics Works Control Office (BCBTP) Brazzaville Congo

This study is to determine the activities and correlations in the fundamental properties of the termite mounds soils Cubitermes spp and Macrotermes sp. The Intrinsic properties depend on the mineralogy, organic composition and texture of soil. Grain size, Atterberg limits and soil blue values are geotechnical properties that were used to characterize the two soils. On the basis of the geotechnical properties, specific surface area, cation exchange capacity, relative activity, surface activity and soil activity were determined. The correlations obtained in the intrinsic soil properties are linear and polynomial fits. Indeed, the relationship between the plasticity index and the blue value of a soil on the one hand and between the specific surface area and the cation exchange capacity on the other hand, is a linear fit for all soils in general. The relationship between plasticity index and specific surface area is a linear fit for the soils (C, M). Correlations in intrinsic soil properties that have a coefficient of determination close to 1 can be used in geotechnical engineering to predict one of the two desired parameters.

关键词： Activity Relative Activity Surface Activity Cation Exchange Capacity Specific Surface Termite Mound Soil

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Characterization of the Activity, Mineralogy and Correlations between the Properties of Clayey Soils

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Journal of Minerals and Materials Characterization and Engineering 2022年第5期10卷 410-428页

作者： Louis Ahouet sorel dzaba Brice Dublin Mbossa Elenga Sylvain Ndinga Okina Fabien T. Kimbatsa Higher Institute of Architecture Urbanism Building and Public Works Denis Sassou N’guesso University Brazzaville Congo Higher Polytechnic National School (ENSP) Marien Ngouabi University Brazzaville Congo Building and Publics Works Control Office (BCBTP) Brazzaville Congo

The activity is related to the mineralogy and geological history of clays. Soils with the same value of the liquidity limit or plasticity index can have very different characteristics depending on the amount and type of clay minerals. The methylene blue value characterizes the activity of the clays and reflects the surface activity. Ten inactive soils contain minerals (kaolinite, illite), these soils absorb little water. Two swelling soils have normal activity and are composed of minerals (kaolinite, illite, Montmorillonite). The relationships between clayey soils properties, their activities and between the activity and the liquidity limit are defined. The correlations obtained are linear fit and exponential and sigmoidal fits. The correlations obtained with a coefficient of determination of R2 (0.859 - 0.999) can be used to characterize and predict certain parameters of fine-grained soils as a function of clay content.

关键词： Activity Specific Surface Area Cation Exchange Capacity Mineralogy Atterberg Limit

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Characterization of the Activity, Mineralogy and Correlations between the Properties of Clayey Soils

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Journal of Minerals and Materials Characterization and Engineering（矿物质和材料特性和工程） 2022年第5期

作者： louis ahouet sorel dzaba brice dublin mbossa elenga sylvain ndinga okina fabien t. kimbatsa2

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