Abstract
The Senegalese road network is strongly influenced in the long term by seasonal variations in climate and weather conditions. Indeed, much of the damage is due to these environmental factors. The objective of this paper is to study the behaviour of bituminous structures under the effect of high temperatures. Material samples were taken for a physico-mechanical characterization of the coated components. The results show that Marshall creep (2.87, 3.39, 5, 5.5 mm) and the bitumen penetrability increase with the increasing of temperatures respectively from 34°C to 45°C and from 20°C to 50°C. Marshall Stability drops from 15.81 kN to 11.31 kN for temperatures between 34°C and 45°C. The simulation carried out on Alize-LCPC shows an increase in distortions of traction at the basis of the rolling layer and at the top of the platform if temperatures vary between 34°C and 45°C. This work makes it possible to conform that the bituminous concrete is thermally sensitive and the hypothesis of fixing the constant modulus of the bituminous layers in Senegal for all projects remains unsuitable for a good dimensioning of sustainable road structures. The knowledge of the equivalent regional temperature will make it possible to produce quality pavements with a long lifespan.
Highlights
This work makes it possible to conform that the bituminous concrete is thermally sensitive and the hypothesis of fixing the constant modulus of the bituminous layers in Senegal for all projects remains unsuitable for a good dimensioning of sustainable road structures
We conclude that the granules through physical and mechanical identification tests are of good quality to be used as input for the bearing layer of the project
The bitumen delivered confirms the class but remains susceptible to temperature. These results combined with a good choice of mix design curve allowed the formulation of an asphalt mix that, through the Marshall and Duriez test meets the requirements of the Airport Blaise Diagne (AIBD)-MBOUR-THIES project
Summary
The advent of the turnpike highway, due to its immensity and importance, is a rare exception and enriches the picture a little by adding the test of gyratory shear press for the International Airport Blaise Diagne (AIBD) project and on IlaTouba, we take into account the rutting. This is far away from coverage of the technical exigency required for a sustainable road project. The objective of this article is to propose a formula for BBSG and to monitor the evolution of its performances according to climatic zones
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