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An Experimental Study on the Use of Fonio Straw and Shea Butter Residue for Improving the Thermophysical and Mechanical Properties of Compressed Earth Blocks

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Document pages: 26 pages

Abstract: The efficient use of building materials is one of the responses toincreasing urbanization and building energy consumption. Soil as a buildingmaterial has been used for several thousand years due to its availability andits usual properties improving and stabilization techniques used. Thus, foniostraws and shea butter residues are incorporated into tow soil matrix. Theobjective of this study is to develop a construction eco-material by recyclingagricultural 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 earthblocks (CSEB) composed of clay and varying proportion (3 to 10 ) of foniostraw and shea butter residue incorporated were subjected to thermophysical,flexural, compressive, and durability tests. The results obtained show that theaddition of fonio straw and shea butter residues as stabilizers improvescompressed stabilized earth blocks thermophysical and mechanical performanceand durability. Two different clay materials were studied. Indeed, for theseCEB incorporating 3 fonio straw and 3 - 10 shea butter residue, the average compressive strength and three-point bending strength values after 28 days old arerespectively 3.478 MPa and 1.062 MPa. In terms of CSEB thermal properties, the averagethermal conductivity is 0.549 W m·K with 3 fonio straw and from 0.667 to 0.798W m. K is with 3 - 10 shea butter residue and the average thermal diffusivity is 1.665.10-7 m2 swith 3 FF and 2.24.10-7 m2 swith 3.055.10-7 m2 s with 3 - 10 shea butter residue, while the average specific heat mass is between 1.508 and1.584 kJ kg·K. In addition, the shea butter residue incorporated at 3 - 10 improves CSEB water repellency, with capillary coefficient values between 31and 68 [g m2·s]1 2 and acontact angle between 43.63°C and 86.4°C. Analysis of the results shows that,it is possible to use these CSEB for single-storey housing construction.

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