In Côte d’Ivoire, the development of the road network represents a major challenge for the national economy, with more than 80% of interurban transport carried out by road. However, bituminous pavements are subjected to mechanical and climatic stresses that accelerate their degradation. Among the factors influencing their durability, temperature plays a decisive role in the mechanical properties of asphalt mixtures, particularly the stiffness modulus. This study addresses this issue by evaluating the evolution of the stiffness modulus of a 0/14 bituminous concrete as a function of temperature.The study was conducted at the Laboratory of Building and Public Works (LBTP) using aggregates from massive rocks and a 60/70 grade bitumen. Experimental methods included aggregate characterization tests (particle size distribution, sand equivalent, Los Angeles, Micro-Deval), bitumen tests (penetration, softening point), as well as mechanical tests (Marshall, Duriez, rutting, stiffness modulus according to NF EN 12697-26).The results show that the stiffness modulus decreases significantly with increasing temperature: above 5000 MPa at 10°C, it drops to less than 1000 MPa at 40°C. This variation reflects a loss of rigidity and mechanical performance, making the asphalt more vulnerable to deformation. These findings highlight the need to adapt asphalt formulations to local climatic conditions to ensure pavement durability.
Ohouo et al. (Wed,) studied this question.