Elaboration of a Road Material Based on Clayey Soil and Crushed Sand

• Published in: Fluid dynamics & materials processing Vol. 18; no. 6; pp. 1595 - 1605
• Main Authors: G. R. Sekloka, H., P. Yabi, C., Cloots, R., Gibigaye, M.
• Format: Journal Article
• Language: English
• Published: Duluth Tech Science Press 2022
• Subjects: Clay soils; Crushing; Dosage; Hydraulics; Mechanical properties; Moisture content; Road construction; Sand; Soil compaction; Soil stabilization
• ISSN: 1555-2578; 1555-256X; 1555-2578
• DOI: 10.32604/fdmp.2022.022434

To contribute to the enhancement of unconventional local materials used for road construction, this study characterizes a crushed sand 0/5, a clayey soil and the litho-stabilized material without and with hydraulic binder and determines their use in accordance with some reference specifications (CEBTP 1984). It is shown that the different components are not usable alone in pavement base. Indeed, the plasticity index obtained for the clayey soil is 21%, a value higher than the imposed standards. In addition, the grading of the 0/5 crushed sand does not fit into the range proposed by CEBTP. A combination of these two (02) components is therefore considered to obtain a suitable material usable for the sub-base. This new material does not enter any class of the CEBTP lateritic soils. In order to be used in base layer, a treatment with hydraulic binder is carried out with the intention to improve its mechanical performances. The optimal dosage of hydraulic binder to achieve the desired mechanical performance is obtained by studying the evolution of the mechanical characteristics of the mixture. After this treatment, the Bearing Ratio index of the mix increases from 37 to 223 for the optimal dosage and the dry compaction density decreases from 2.11 to 2.06 g/cm3 while the optimal water content increases from 9% to 10.1%.