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Engineering（科研） 2019年第12期11卷 819-827页

作者： Timothée Thierry Odi Enyegue Didier Fokwa Eric Flavien Mbiakouo-Djomo ebenezer njeugna Doctoral Unit of Engineering Sciences Laboratory of Mechanical Engineering ENSET University of Douala Douala Cameroon Department of Civil Engineering ENSET Douala University Douala Cameroon Department of Mechanical Engineering Douala University Douala Cameroon

We explore the parameters that influence the dynamics of water erosion. The method used is an experimental laboratory simulation, which consists of the quantitative evaluation of eroded masses as a function of slope, soil cohesion and rainfall intensity. A simulator was designed to have the ability to vary the slope of the terrain, as well as the rainfall intensity. The variation of the soil cohesion is obtained by compacting the soil under different pressures using a hydraulic press associated with the whole experimental device. The results obtained show that the device is a good tool to simulate in the laboratory the behavior of different soil under the action of rain;because these results are in agreement with existing models USLE, MUSLE and RUSLE [1] [2] [3] [4].

关键词： Water Erosion Mini-Rain Simulator Cohesion of a Soil Simulation Slope

Experimental and Analytical Study of Water Diffusion in Palm Kernel Shell of Cameroon

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Materials Sciences and Applications 2020年第11期11卷 733-743页

作者： Dieunedort Ndapeu Jean Bosco Kuate Yagueka Francis Tamwo Bernard Morino Ganou Koungang Médard Fogue ebenezer njeugna Research Unit of Industrial and Systems Engineering Environment (UR-ISIE) IUT/FV Bandjoun University of Dschang Dschang Cameroon Research Unit of Mechanics and Modeling of Physical System (UR-2MSP) University of Dschang Dschang Cameroon Laboratory of Mechanics and Adapted Materials (LAMMA) ENSET University of Douala Douala Cameroon

Moisture diffusion during soaking of palm kernel shell (Elaeis guineensis) aggregate concerning DURA variety of Cameroon was studied. Parameters like percentage of water gain at the saturation point and the effective moisture diffusivity were the main purposes. The knowledge of the behavior of those shells in presence of the liquid during the realization of the composite materials is important. Gravimetric method with discontinuous control of the mass of sample after immersion at the ambient temperature was used. Palm kernel shell aggregate of two origins and two considerable sizes respectively in mm: Sizes ≥ 16 and 12.5 ≤ Sizes -8 and 7.90 × 10-9 m2/s] was also determined according to their irregular shapes by fitted soaking data in Becker’s model.

关键词： Palm Kernel Shell (PKS) Absorption Moisture Diffusivity

Contribution to the Characterization of Palm Kernel Shell from Littoral, Cameroon

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Materials Sciences and Applications 2020年第10期11卷 668-677页

作者： Dieunedort Ndapeu Jean Bosco Kuate Yagueka Efeze Dydimus Nkemaja Bernard Morino Ganou Koungang Médard Fogue ebenezer njeugna Research Unit of Industrial and Systems Engineering Environment (UR-ISIE) IUT/FV Bandjoun University of Dschang Dschang Cameroon Research Unit of Mechanics and Modeling of Physical System (UR-2MSP) University of Dschang Dschang Cameroon Laboratory of Mechanics and Adapted Materials (LAMMA) ENSET University of Douala Douala Cameroon

The experimental study carried out in this work contributes to the physico-mechanical characterization of the palm kernel shells (PKS) Elaeis guineensis of the DURA and TENERA varieties. The knowledge of these properties gives an idea of their behaviour in the realization of composites and others. The absolute density was determined by the method of pycnometer, the porosity and compactness of PKS too;respectively 1428.81 kg/m3 for Dura, 1395.81 kg/m3 for Tenera;0.041 for Dura, 0.158 for Tenera;0.958 for Dura, 0.841 for Tenera. The impact energy of PKS by the pendulum sheep method has an average value of 2.066 J/cm2 and 1.894 J/cm2 for Dura and Tenera respectively at a temperature of 26°C. The longitudinal Young’s modulus of 19 GPa and 17.9 GPa for Dura and Tenera, respectively, was determined by applying the Castigliano theorem through a three-point bending test device.

关键词： PKS Density Compactness Impact Energy Young’s Modulus

Physical, Water Diffusion and Micro-Structural Analysis of “Canarium Schweinfurthii Engl”

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Materials Sciences and Applications 2020年第9期11卷 626-643页

作者： Bernard Morino Ganou Koungang Dieunedort Ndapeu Gilbert Tchemou Paul William Huisken Mejouyo Bernard Wenga Ntcheping Josepha Tendo Foba Luc Courard ebenezer njeugna Laboratoire de Mécanique et Matériaux Adaptés (LAMMA) Université de Douala (UDo) Douala Cameroon Urban and Environmental Engineering (UEE) Laboratoire des Matériaux de Construction (LMC) Université de Liège (ULiège) Allée de la Découverte Liège Belgique

The purpose of this study is to determine the morphological, microstructural characteristics and water diffusion parameters of the Canarium schweinfurthii (CS) shellnut. This work is part of a vast project to valorize the above-mentioned cores for possible industrial use as charges in composites or abrasives materials. The study was based on the characterization of intrinsic physical characteristics of the coreshells scanning electron microscopic (SEM) observations desorption, adsorption and absorption kinetics. The water diffusion phenomenon was modeled and it appears that the Page model well predicted the kinetic of drying, absorption and adsorption. The effective diffusion coefficient and the energy of activation were calculated at three isothermal temperatures (50°C, 70°C and 90°C). There was a tendency for hysteresis in the sorption-desorption cycles. These results strongly predicted the possibility of using these products as a filler in composites, clay building materials and cement because of their high water diffusion stability on a macroscopic scale.

关键词： Bioresources Shellnut Canarium Schweinfurthii Engl Microscopy Water Absorption Moisture Adsorption Desorption

Effects of Soil Compaction in the Fight against Unpaved Roads Degradation Due to Erosion Caused by Heavy Rain: Proposition of a Specific CBR Evaluation Model

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Engineering（科研） 2021年第3期13卷 95-104页

作者： Timothée Thierry Odi Enyegue Eric Flavien Mbiakouo-Djomo Hugues Tsanga Fabien Kenmogne Blaise Ngwem Bayiha Gilbert Tchemou ebenezer njeugna Didier Fokwa Laboratory of Mechanics Doctorate Unit of Engineering Sciences Doctorate School of Fundamental and Applied Sciences University of Douala Douala Cameroon Department of Rural Engeineering FASA University of Dschang Dschang Cameroon Civil Engineering Department Higher Technical Teacher’s Training College University oh Douala Douala Cameroon Mechanics Engineering Department Higher Technical Teacher’s Training College University oh Douala Douala Cameroon

Unpailt roads are generally subject to erosion, when they need to be bitumen, civil engineers need to know the geotechnical capabilities of the soil layers to be used as support, among these capabilities, for example, soil characteristics to withstand erosion. CBR has often been used to classify these soils according to their compaction. In this article, we propose a correlation between CBR and eroded soil mass through a simulator. Indeed, in this article we show that using a simulator, soils can be classified according to their ability to withstand water erosion, whether internal or external. Indeed it is shown that the mass of eroded soil is related to the compaction capacity of the soil just as the CBR also has. We study the effects and influence of soil compaction on the ability of an unpaved road to resist erosion caused by falling raindrops. To do this, lateritic soil is submitted to different compaction pressures. The compacted soil is then submitted to CBR test and rain fall through a mini rain simulator. Correlations between eroded soil masse and compaction pressure as well as CBR are derived. The study shows that the compaction reduces the erodibility and increases the bearing capacity of soil. The formula obtained is significant because we have a new way of evaluating soils in the laboratory.

关键词： Compaction Erosion Lateritic Soil Rain Drop Unpaved Roads