Physical,Hydric, Thermal and Mechanical Properties of Earth Renders Amended with Dolomitic Lime |
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Authors: | Halidou Bamogo Moussa Ouedraogo Issiaka Sanou Jean-Emmanuel Aubert Younoussa Millogo |
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Affiliation: | 1.Laboratoire de Chimie et Energies Renouvelables (LaCER), UFR/Sciences Exactes et Appliquées, Département de Chimie, Université Nazi BONI (UNB), Bobo-Dioulasso 01 BP 1091, Burkina Faso;2.Laboratoire Matériaux et Durabilité de Constructions (LMDC), INSA-Génie Civil, Université de Toulouse, 135 Avenue de Rangueil, CEDEX 4, F-31 077 Toulouse, France; |
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Abstract: | The global objective of this work was to manufacture resistant and durable (water resistant) earth renders with good thermal insulation. For this purpose, a medium plastic clayey soil from Kôdéni (Burkina Faso), constituted by kaolinite (62 wt.%), quartz (31 wt.%), and goethite (2 wt.%), was mixed with dolomitic lime (up to 6 wt.%) to manufacture earth renders. The mineralogical, microstructural, and chemical characteristics of dolomitic lime, as well as the physical (linear shrinkage, apparent density, and accessible porosity), hydric (water absorption test by capillarity and spray test), thermal (thermal conductivity), and mechanical (abrasion resistance, flexural, and compressive strengths) properties of the earth renders were evaluated. From these studies, it appears that the addition of dolomitic lime induces the formation of calcium silicate (CSH) and magnesium silicate (MSH) hydrates. These CSH and MSH are mainly formed from the pozzolanic reaction between finely ground quartz and the weak silica of kaolinite in basic media. These formed hydrates improve the physical, hydric, thermal, and mechanical properties of earth renders. This improvement is due to the fact that the formed CSH and MSH stick to the isolated particles of the soil, making them more compact. In view of the good mechanical strength and water resistance, as well as the low thermal conductivity, the elaborated earth renders are suitable for habitats with dry climates, such as the Sahel. |
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Keywords: | earth renders dolomitic lime calcium silicate hydrate magnesium silicates hydrates physical hydric and mechanical properties thermal comfort |
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