Browsing by Author "Lawane, Abdou"

Now showing 1 - 2 of 2
  • Thumbnail Image
    Item
    Characterization of the Lateritic Soil of Kamboinsé (Burkina Faso)
    (Proceedings of the RILEM International Symposium on Bituminous Materials (Springer), 2022) Mbengue, Marie Thérèse Marame; Messan, Adamah; Lawane, Abdou
    Laterite is a very common material in tropical countries. Good quality lateritic deposits are becoming increasingly rare. This material is used as a base course for most roads built in tropical Africa. These materials are selected on the basis of geotechnical test results in accordance with current standards. However, these materials do not perform well in situ after a short period of time, causing premature pavement degradation. This poor behavior can be ascribed to insufficient geotechnical testing to justify the choice of these materials in road construction. In this work, in addition to traditional geotechnical tests (particle size analysis, Atterberg limits, modified Proctor, CBR Index), compression tests were performed in addition to traditional geotechnical tests to determine compressive strength and elasticity modulus. Geotechnical tests carried out on the laterite of Kamboinsé according to the lithology of the quarry reveal that the characteristics decrease with depth and that the first layer can be used as a base layer. Cement improvement for small percentages (1, 2 and 3%) shows a clear improvement in mechanical characteristics. An addition of 2% cement allows the use of the second base layer, improvement of 3% allows the use of the first layer as a base layer. An addition of granite crushed granites of class 0/31.5 improved the physical properties of materials for additive percentages varying from 20, 25, 30 and 35% by weight of dry materials. This improvement allows the use of layers 1, 2 and 3 as a base layer for low traffic, layer 4 can be used as a base layer.
  • Thumbnail Image
    Item
    "Improving the thermal comfort in hot region through the design of walls made of compressed earth blocks: An experimental investigation"
    (Journal of Building Engineering, 2021) Hema, Césaire; Messan, Adamah; Lawane, Abdou
    There is growing need for new buildings to support the urbanization and demographic boom in developing countries. These buildings should be environmentally friendly, economically accessible and, most importantly, thermally efficient. The latter aspect is particularly important when dealing with naturally ventilated buildings in hot-dry regions. For this purpose, the thermal design of walls based on compressed earth blocks (CEB) need to be studied in order to achieve optimal use of this material. The present study aimed at experimentally analysing the thermal performance of a test building which has three different design (wall layers) of external wall and two scenario of ventilation. Thermal sensors was used on the test building in order to determine the indoor and outdoor air temperature as well as the surface temperature of the walls. The results show that the location of wall layers influences the indoor climate. When CEBs layer is placed inside, it leads to the highest reduction of the indoor temperature fluctuations. When CEBs layer is placed outside, it presents the best opportunity to prevent overheatingin building spaces mainly occupied at night. Regardless of the wall design, nocturnal ventilation is the most suitable strategy which leads to improving the indoor climate compared to continuous ventilation. It is highlighted that the occupancy pattern of the buildings’ spaces as well as the addition of the insulation layer to the CEBs walls are important factor to consider for the design of external walls.