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Influence of Shea Butter Residues on the Physico-Mechanical Properties of Earth Renders

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Abstract

This paper studies the influence of shea butter residues on the physical and mechanical performance of earth renders. Mineralogical and microstructural characteristics of shea butter residues as well as the physical and mechanical parameters of earth renders were evaluated. The results showed that shea butter residues are mainly composed of fatty substances. To enhance physical and mechanical performance of earth renders, contents varying from 0 to 6 wt% of shea butter residues were added to a local clayey soil, predominately composed of kaolinite (60 wt%), quartz (31 wt%) and feeble amount of goethite (2 wt%). This study showed that the incorporation of shea butter residues to earth renders improved meaningfully their physico-mechanical properties such as water and erosion resistance. This is particularly attributable to the hydrophobic properties of fatty substances contained in shea butters. Furthermore, shea butter residues incorporation increases earth renders porosity which contributes to reduce mechanical resistance and thermal conductivity and making the renders more insulating. Taking into account construction standards based on the protection of earth buildings and also their advantageous hydric properties and insulating power, earth renders amended with shea butter could be an adequate and affordable habitat building material throughout tropical regions of the world.

Highlights

Shea butter residues addition to earth renders decreases their linear shrinkage.

Earth renders amended by shea butter residues have good water resistance.

Shea butter residues addition to earth renders decreases their thermal conductivity.

Lipidic molecules in shea butter residues explain these observed improvements.

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Acknowledgements

The authors are grateful to all laboratory technicians of “Laboratoire Materiaux et Durabilité des Constructions” of the Université Paul Sabatier, Toulouse III (France) for their constant help in the realization of microstructural characterization.

Funding

This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.

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Authors and Affiliations

  1. Laboratoire de Chimie et Energies Renouvelables (LaCER), UFR/Sciences et Techniques, Université Nazi BONI, 01 BP 1091 Bobo 01, Dindéresso, Burkina Faso

    Halidou Bamogo, Lohami Valentin Landry Gnoumou & Younoussa Millogo

  2. INSA/UPS Génie Civil, LMDC, Université de Toulouse, 135 Avenue de Rangueil, 31077, Toulouse cedex 04, France

    Jean-Emmanuel Aubert

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  1. Halidou Bamogo
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  2. Lohami Valentin Landry Gnoumou
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  3. Jean-Emmanuel Aubert
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  4. Younoussa Millogo
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Contributions

Bamogo Halidou and Lohami Valentin Landry Gnoumou carried out the experiments and wrote the paper. Aubert Jean-Emmanuel and Millogo Younoussa also contributed to write the paper and have validated the experiments. All of the four authors participated in the final corrections of the paper and have contributed to the manuscript reviews. All authors have read and agreed to the publishing of this manuscript version.

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Correspondence to Younoussa Millogo.

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The four authors declare no conflict of interest during the paper writing. Younoussa Millogo is Associate Editor of Chemistry Africa.

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Bamogo, H., Gnoumou, L.V.L., Aubert, JE. et al. Influence of Shea Butter Residues on the Physico-Mechanical Properties of Earth Renders. Chemistry Africa 7, 1337–1352 (2024). https://doi.org/10.1007/s42250-023-00847-5

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