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Collaborative Effect of Fines on Changes in Grain Distribution in the Process of Improving the Geotechnical Properties of an Alluvial Gravel 0/14

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Geomaterials 2024年第3期14卷 29-48页

作者： Adolphe Ekouya Louis Ahouet sylvain ndinga okina Higher National Polytechnic School (ENSP) Marien Ngouabi University Brazzaville Congo Higher Institute of Architecture Urbanism Building and Public Works Denis Sassou Nguesso University Brazzaville Congo Control Office for Building and Public Works (BCBTP) Brazzaville Congo

The technical and economic optimization of road projects has led to research into the use of materials obtained by mechanical stabilization for pavement construction. This research has enabled us to outline a solution capable of giving the sub-base layer the necessary and sufficient capacity to support the induced loads forecast for the traffic. This work evaluates the effect of adding fine silty clay (Cl) and clayey silt (Csp), two corrective materials to alluvial gravel (0/14), the main material, in the process of improving its cohesion and geotechnical properties. The results obtained show that the optimum mix is obtained with 10% by weight of Cl and 15% Csp. The granulometry of the mixes is spread out, but poorly calibrated. The Ag-Cl mixtures made at 10%, 15%, 20%, 25% 30% and Ag-Csp at 15%, 20%, 25%, 30%, and 35%, do not obey the law of mixtures. Mixing with 10% Cl reduces the sand equivalent of alluvial gravel by 60.23%, while mixing with 15% Cl reduces the sand equivalent by 6.82%. The addition of correctors increases the optimum water content and fine sand content of the mixes. Increasing the fine sand content reduces the optimum dry density, CBR index and static modulus. Mixes containing 10% Cl and 15% Csp have CBR values of CBRCl (96%) and CBRCsp (84%) and are not suitable for pavement base layers. In fact, the hardness of the grains has a Los Anges value of 41%, higher than the maximum permitted by the standard of 35%. The mixes obtained can be used as pavement base layers for traffic levels in a cumulative number of heavy goods vehicles 5 × 105 6 for an approximate life of 15 years.

关键词： Alluvial Gravel Cubitermes Sp Termite Fines Mechanical Treatment Corrector

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Geotechnical Characterization of Termite Mound Soils of Congo

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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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Improvement of the Geotechnical Properties of the Soil of Lime-Treated Cubitermes Mound Soil

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Open Journal of Civil Engineering 2020年第1期10卷 22-31页

作者： Séverin Jean Maixent Loubouth Louis Ahouet Raymond Gentil Elenga sylvain ndinga okina Paul Louzolo Kimbembe Laboratoire des Matériaux et Energies Faculté des Sciences et Techniques Université Marien Ngouabi Brazzaville Congo Ecole Nationale Supérieure Polytechnique Université Marien Ngouabi Brazzaville Congo Bureau de Contr?le du Batiment et Travaux Publics Brazzaville Congo Ecole Normale Supérieure Université Marien Ngouabi Brazzaville Congo

This work consisted in determining the geotechnical properties of the soil of the Cubitermes termite mound soil treated with lime for use in road construction in accordance with the relevant standards. The raw soil is composed of 29.45% clay, 45.12% silt and 25.43% sand, and its granulometric curve is above the relevant standard curve. The addition of lime up to 9% decreases the fine fraction content from 75% to 60%, and the maximum dry density from 1.62 t/m3 to 1.36 t/m3. The reduction of the fine fraction should reduce the soil sensitivity to water, and the emission of dust from the road. The compressive strength of the raw soil (3.89 MPa) is higher than that of most cohesive soil, and is probably one the causes of the longevity of the rural road paved with this soil. Treated soil with 6% in lime content has the highest compressive strength (5.95 MPa), and the lowest deformation at failure. Until 28 days, the improvement of the compressive upon the curing time is almost the same for untreated and treated termite mound soils. Thus, this improvement could be mostly attributed to the drying of the samples instead to the pozzolanic reactions. Besides, adding lime also enhances the shear strength of soil. Therefore, adding lime up to 6% in content to the termite mound soil should improve its behavior as surface roads.

关键词： Cubitermes Mound Soil CEBTP 1980 Unpaved Roads Geotechnical Properties

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