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Adding Hydrated Lime in a Material Made of Clayey Soil and Fibres: Formulation and Effects on Thermo-Mechanical Properties

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Document pages: 13 pages

Abstract: In thisstudy, we have focused our investigations on effect of adding hydrated lime ona locally made composite material, based on clayey earth (soil) and Hibiscus sabdariffa fibres, for envelope(walls) in the building. Prior to sample’s formulation, we selected anappropriate mineral (soil) material based on criteria as: plasticizer power forgood workability, dense coarse particles to withstand loads and finally porousstructure to take advantage of air insulating character. We then formulated,following a mixing process by shearing and compaction by vibration that werecommend, two composite materials (A), (B) which contain respectively 1 Fibres plus 1 lime, 1 Fibres plus 3 lime. We determined thermal propertiesby the mean of KD2 Pro thermal analyzer, compression strength accordingly tothe standard NF P 18-406, porosity following volumetric and gravimetric methods and pH ofsoil-hydrated lime solution. Asresults, up to 5 of hydrated lime, the measured pH is inferior to 12:mineralization of vegetal fibres is highly unlikely. Moreover, we observe thatthe addition of hydrated lime resulted in a reduction in the number of cracksand their depths; Samples (A) and (B) have a rather compact appearance than thecase 1 Fibres without lime (material (C)). Furthermore, with limestabilization, the insulating potential is improved while the thermal inertiahas been deteriorated compared to material (C). However,compressive strength decreases with lime, which could be due to the presence offibres that would inhibit the hardening of the lime. At last, with 3.39 ±3.07 MPa, 2.27 ± 11.30 MPa for samples (A), (B) respectively, the minimum required byCRATerre-EAG (guide of CDI, 1996) for construction of envelope (walls) ofsingle storey (ground floor) buildings is met.

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