eng Science and Education Publishing American Journal of Civil Engineering and Architecture 2328-3998 2025-09-07 13 4 89 95 10.12691/ajcea-13-4-1 AJCEA20251341 article Coovi rocambols Th¨¨de AGBELELE agbelelerocambols@gamil.com 1 Val¨¦ry k. DOKO 1 Edem CHABI 2 Boris GANMAVO 2 Mohamed GIBIGAYE 2 Civil Engineering Department, University of Abomey-Calavi, Abomey-calavi, Benin Civil Engineering Department, National University of Agriculture, K¨¦tou, Benin In Benin, the expansion of road infrastructure projects has led to a growing demand for quality construction materials, while conventional resources are becoming increasingly scarce. In this context, the valorization of local materials such as bar soil¡ªwhich is abundant but mechanically weak¡ªhas become essential. This study investigates the geotechnical enhancement of Tori-Dokanmey bar soil through lithostabilization using crushed granite aggregates sourced from Dan. Bar soil and granite aggregate samples were collected and characterized in accordance with applicable geotechnical standards. Five mixtures were formulated with granite contents of 30%, 40%, 50%, 60%, and 70%. The results indicate that the addition of granite aggregates improves particle size distribution, lowers the liquid limit and plasticity index, increases maximum dry density, and reduces optimum moisture content. The California Bearing Ratio (CBR) shows a significant increase with higher granite contents, reaching values that meet the requirements for sub-base layers in all mixtures, and for base layers in mixtures with 60% or more granite. These findings confirm that lithostabilization of bar soil with crushed granite is an effective, economical, and sustainable solution for road construction in Benin. https://pubs.sciepub.com/ajcea/13/4/1/ajcea-13-4-1.pdf Bar soil Lithostabilization CBR index Granite aggregate Plasticity