Abstract
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 m2/s with 3% FF and 2.24.10-7 m2/s with 3.055.10-7 m2/s with 3% - 10% shea butter residue, while the average specific heat mass is between 1.508 and 1.584 kJ/kg·K. In addition, the shea butter residue incorporated at 3% - 10% improves CSEB water repellency, with capillary coefficient values between 31 and 68 [g/m2·s]1/2 and a contact 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.
Highlights
The construction industry has always exploited natural and/or manufactured resources to meet development needs
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
It can be seen that the stabilizers used influence differently the compressed stabilized earth blocks (CSEB) mechanical behaviour and it can be noted that: ● the presence of 3% fonio straw leads to a decrease in dry density and a significant increase in results of bending strength (Rf) and relationship between compressive strength (Rc)
Summary
The construction industry has always exploited natural and/or manufactured resources to meet development needs. Ouedraogo et al (2019) [1] point out that the construction of concrete habitats is costly in developing countries and has a high level of environmental impact Materials such as cement block are usually used in Sub-Saharan African countries, such as Burkina Faso in the context of socio-economic housing construction projects. At this level, the use of stabilized or unstabilized compressed earth blocks (CEBs) is not yet explored, while the development of local secondary natural resources, often considered as waste, is a more explored research area for construction ecomaterials development. Whereas according to Fetra Venny Riza et al (2010) [2] Compressed Stabilized Earth Brick (CSEB) gives the view of energy-efficient, cost reduction and environmentally-friendly building materials, overall contribution on the sustainable development
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Journal of Minerals and Materials Characterization and Engineering
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
