Current pavement design methods do not allow for the reduction of early
deformation of the surface layers of bituminous pavements in the city of
Ouagadougou. Weather conditions combined with traffic, particularly during
heat waves, are factors. The temperature at the surface of the bituminous
pavement can reach 62˚C but the complex modulus associated with this temperature is not taken into account in the design, hence the interest in proposing laws of dependence of the complex moduli is taken into account in the
maximum temperatures of the pavement surface. The objective of this paper
is to propose an experimental method to determine the temperature dependence of the complex moduli of asphalt mixes for temperatures between 40˚C
and 70˚C. This experimental method consists of performing axial compression tests on cylindrical asphalt specimens. It was applied to three different
formulas of bituminous mixes, intended for the wearing course, obtained
from mixes of crushed granites, granular classes 6/10, 4/6 and 0/4, pure bitumens of grade 50/70, 35/50 and modified bitumen of grade 10/65. The comparative study of the experimental results obtained with the results of a semiempirical methodology revealed a root mean square deviation from the mean
of between 6.58% and 14.8% of the norms of the complex moduli (modulus
of rigidity) of the asphalt mixes for a fixed frequency of solicitations of 10 Hz.
The consistency of these results with data from the literature led to the initial
conclusion that asphalt mixes formulated with 35/50 and 10/65 bitumen
would have better compressive strength than those formulated with 50/70 bitumen, for exposure temperatures between 40˚C and 70˚C. This experimental
approach could be an alternative to the complex modulus test for determining the modulus of rigidity for design purposes under real pavement exposure
conditions in the city of Ouagadougou during heat waves

Asphalt Mix Complex Modulus Axial Compression