The efficient use of building materials is one of the responses to increasing urbanization and building energy consumption. Soil as a building material has been used for several thousand years due to its availability and its usual properties improving and stabilization techniques used. Thus, fonio straws and shea butter residues are incorporated into tow soil matrix. The objective of this study is to develop a construction eco-material by recycling agricultural and biopolymer by-products in compressed earth blocks (CEB) stabilization and analyze these by-products' influence on CEB usual properties. To do this, compressed stabilized earth blocks (CSEB) composed of clay and varying proportion (3% to 10%) of fonio straw and shea butter residue incorporated were subjected to thermophysical, flexural, compressive, and durability tests. The results obtained show that the addition of fonio straw and shea butter residues as stabilizers improves compressed stabilized earth blocks thermophysical and mechanical performance and durability. Two different clay materials were studied. Indeed, for these CEB incorporating 3% fonio straw and 3%-10% shea butter residue, the average compressive strength and three-point bending strength values after 28 days old are respectively 3.478 MPa and 1.062 MPa. In terms of CSEB thermal properties, the average thermal conductivity is 0.549 W/m•K with 3% fonio straw and from 0.667 to 0.798 W/m. K is with 3%-10% shea butter residue and the average thermal diffusivity is 1.665.10 −7 m 2 /s with 3% FF and 2.24.10 −7 m 2 /s with 3.055.10 −7 m 2 /s with 3%-10% shea butter residue, while the average specific heat mass is between 1.

Buildings should be assessed in their energy behaviour to identify the most suitable construction material for the climatic context. This paper studies the influence of construction materials for the wall in housing hygrothermal behavior and energy efficiency. Three types of construction material for the wall, which are CSEB of fonio straw and Shea butter cakes, cement blocks, and cut laterite blocks were selected and the building design was modeled in the DesignBuilder interface. The thermal comfort and total amount of energy required for building cooling were calculated using dynamic modelling using EnergyPlus software. The simulation was run according to the meteorological parameters of Ouagadougou city and we noted that the housing thermal behaviour is impacted by the wall in earth-based. The results show that the number of warm thermal discomfort hours and the cooling energy loads are respectively reduced by an average rate of 10.60% and 93.86% in housing with the wall in CSEB of fonio straw and Shea butter residue masonry, in comparison with the wall in cement or cut laterite blocks masonry. In terms of the indoor environment, the effect of this wall in earth-based makes it possible to maintain an average internal temperature and indoor operating temperature respectively at 28.64°C and 25.82°C. The average indoor temperature peaks damping is achieved to 6.54°C (i.e. 22.83%). It is thus noted that these CSEB walls are an efficient contribution to sustainable dwelling construction in a hot region.

<p>The present work is a contribution to the energy efficiency in the habitats by the valorization of the local building materials in Burkina Faso. A comparative numerical study on the thermal behavior and energy consumption of some habitats in local and modern building materials is carried out. The simulations were carried out using computer code written in FORTRAN language over a period of one year. Analysis of the results shows that habitats in local construction materials (BTC, BLT, adobe) have a better thermal response compared to modern building materials (hollow cinder block). Generally speaking, the temperature and humidity profiles obtained do not make it possible to ensure the summer comfort in these buildings throughout the year. The evaluation of air-conditioning loads to ensure thermal comfort in these habitats shows that they are higher respectively in the blocks, BLT, BTC, adobe constructions. We therefore consider that local building materials represent a good alternative for the search for energy efficiency in buildings.</p>

The main objective of this study is to characterize a material, non-autoclaved aerated concrete, referred to as "foamed concrete", newly produced in Burkina Faso. This study made it possible to determine some thermo-physical, mechanical and hygro-thermal properties of foamed concrete. The material was obtained by making a mixture of cement, sand, water and a foaming agent.The tests were carried out with five types of samples having densities between 600 and 930 kg/m 3 and a water content ranging from 22 to 35%. The experimental results obtained show that the studied foamed concrete has a thermal conductivity ranging from 0.05 to 0.2 W/m.K and compressive strength is between 1.2 to 3.4 MPa. The dynamic Young's modulus is between 1.18and 3.1 GPa and the porosity is varying from 55.60 to 72.36%. Analysis of the results show that the incorporation of the foam in the mortar made it possible to have a more insulating material and acceptable mechanical properties for sustainable construction.

No abstract