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Study of the Influence of a Young Synthetic Leachate on the Hydromechanical Properties of a Swelling Clay

Journal of Environmental Science and Engineering(B) 2017年第11期6卷 569-581页

作者： Hamma Fabien Yonli David Yemboini Kader Toguyeni moussa sougoti Department of Physics the University Ouaga I Pr Joseph KI-ZERBO BP 7021 Ouagadougou 03 Burkina Faso Department of Civil Engineering the University of Fada N'Gourma BP 46 Fada N'Gourma Burkina Faso

Despite the developments of sectors which aim at valorizing recyclable materials, landfills remain essential in integrated waste management. The construction of such infrastructures is an engineering challenge that must be proven over the long term. The purpose of this study is to understand the modification of the hydromechanical properties of bottom liners of landfills that may occur during their exploitation under leachate action. To do so, on the basis of its parameters of nature, a swelling clay from Burkina Faso is selected from soils of seven localities in Burkina Faso （West Africa）. Laboratory tests carried out with distilled water and then with a young synthetic leachate show a degradation of the permeability of this clay from 2.42 × 10^-10 m/s to 1.01 × 10^-9 m/s. In addition, leachate leads to an inhibition of the swelling and a remarkable increase of its compressibility, inducing significant settlement. With the increase in permeability, the primary consolidation settlement is increasing faster. Changes in the hydromechanical behavior can be attributed to the clays mineralogy, mainly cation exchange and the development of the diffuse double layer.

关键词： Bottom liner leachate hydraulic conductivity compressibility consolidation.

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Thermal Effect of Braking on Pavements during Heat Waves in Ouagadougou

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Materials Sciences and Applications 2023年第7期14卷 382-396页

作者： Sidpouita Mathilde Koudougou Hamma Fabien Yonli moussa sougoti David Yemboini Kader Toguyeni Institut du Génie des Systèmes Industriels de Textiles Ecole Polytechnique de Ouagadougou Ouagadougou Burkina Faso Laboratoire de Physique et de Chimie de l’Environnement Ouagadougou Burkina Faso Université de Fada N’Gourma Fada N’Gourma Burkina Faso Université Joseph Ki-Zerbo Ouagadougou Burkina Faso

Flexible pavements, whose surface layers are made from hot mix asphalt, may show rutting in some of these infrastructures during the first months of life. In the city of Ouagadougou, this rutting phenomenon is sometimes observed. The objective of this article is to quantify the thermal response of the wearing course of national roads 1 and 2, when they are subjected to the braking of heavy trucks of 13 tons and 20 tons per axle. The meteorological conditions retained are those of the Burkinabe climate. The evaluation of the temperature was carried out by numerical simulation using the Comsol Multiphysics 5.2 software. This study showed that the thermal response of the pavement to the combined effects of surface temperature, overloading by a 20 tons heavy truck and braking during a heat wave increase in pavement surface temperature ranging from 1.09% for National Road 1 to 0.91% for National Road 2, particularly in the braking zone. This made it possible to establish the diagnosis according to which the nature of the bitumen used on the wearing course can reduce rigidity modulus. In predictive terms, they allowed us to deduce that an under-dimensioning of the wearing course, even if the bitumen was used is adequate.

关键词： Road Modeling Finite Elements Thermomechanical Tropical Climate

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Thermal Effect of Braking on Pavements during Heat Waves in Ouagadougou

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Materials Sciences and Applications（材料科学与应用期刊） 2023年第7期

作者： Sidpouita Mathilde Koudougou Hamma Fabien Yonli moussa sougoti David Yemboini Kader Toguyeni

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