Sustainable approach to road construction: Utilizing sand asphalt and lateritic gravel for the base course of the Daloa–Issia Road (Cote D'ivoire)
Year: 2025
Type: article
Abstract: The scarcity of natural aggregates necessitates new solutions for sustainable road construction. This work evaluates the feasibility of reusing a blend of degraded sand asphalt and lateritic gravel (MESAGLA), sourced from the Daloa–Issia road (Côte d’Ivoire), as a base course material. Geotechnical tests (grading curve, Atterberg limits, Modified Proctor, CBR) were conducted to characterize this material. The results show that MESAGLA has a particle size distribution well-suited to road specifications and a satisfactory plasticity index (PI = 18.88). The optimum water content (6.21 %) and the maximum dry density (2.30 t/m³) indicate good compaction conditions. However, the measured CBR value (59 at 99 % compaction) remains insufficient for direct use in a base course, in accordance with current standards (CBR $\geq 80$). It is therefore necessary to resort to hydraulic binder stabilization or the addition of crushed aggregates to improve its mechanical performance. This approach illustrates the potential for utilizing recycled materials within a perspective of the circular economy and sustainability in highway engineering.
Institution: Université Jean Lorougnon Guédé
Language: English
Subfield: Civil and Structural Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7125972138
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