Abstract
This study assesses the reactivity of four (04) different types of clayey earthen materials (Kamboinsé, Pabré, Saaba, and Kossodo) with Ca(OH)2, analytical lime (AL) versus lime residu (LR), in ambient conditions. The effect of the stabilization of the earth with the LR was also studied on the performances of compressed earth blocks (CEB). The lime content varied from 0% to 20% with respect to the mass of dry earth material. The analysis of the reactivity and physico-mechanical properties were respectively carried out on the solutions of the mixtures (earth + LR and earth + AL) and CEB (earth + LR). The mixtures were cured between 0 and 60 days at the ambient temperature of laboratory (30℃ ± 5℃). The results showed that the reactivity of the clayey earth materials with AL is comparable to that with the LR. At the same time, this reactivity improved the physical and mechanical properties of stabilized CEB depending on the type of earth material, lime content and curing time. The maximum values of the dry compressive strength, observed for each material stabilized with 20% LR, are 6 and 7 MPa (Kamboinsé), 8.8 and 9.3 MPa (Pabré), 6 and 6.5 MPa (Saaba), 8.8 and 9.7 MPa (Kossodo) respectively at curing time of 28 and 45 days. The structural efficiency of CEB was also improved which implies that, in the current conditions, the stabilization of earth materials using LR allows to produce the CEB for potential applications in wall masonry.
Highlights
In recent years, the earth material has known a fairly significant recovery for its use for the construction of habitats [1]-[7]
The present study evaluates the reactivity of different clay materials with lime and the influence of the addition of lime residue (
The decrease of the electrical conductivity (EC) is related to the reaction between earth and lime, which results in the consumption of Ca2+ and OH− initially dissolved from the lime: Ca(OH)2 [8]
Summary
The earth material has known a fairly significant recovery for its use for the construction of habitats [1]-[7]. The use of lime can allow to improve the physical, mechanical and thermal properties of CEB produced with the reactive clayey earth. It has little effect on the earth less rich in clay [9]. Another study has shown the possibility to correlate the mechanical and physical properties of CEBs, through the compressive strength and abrasion resistance [12] This correlation was established on the basis of only one type of clayey earth material and still requires the validation on other types of materials and mixtures.
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