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 th... 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<span style="white-space:normal;">°</span>C and from 20<span style="white-space:normal;">°</span>C to 50<span style="white-space:normal;">°</span>C. Marshall Stability drops from 15.81 kN to 11.31 kN for temperatures between 34<span style="white-space:normal;">°</span>C and 45<span style="white-space:normal;">°</span>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<span style="white-space:normal;">°</span>C and 45<span style="white-space:normal;">°</span>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.展开更多
文摘 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<span style="white-space:normal;">°</span>C and from 20<span style="white-space:normal;">°</span>C to 50<span style="white-space:normal;">°</span>C. Marshall Stability drops from 15.81 kN to 11.31 kN for temperatures between 34<span style="white-space:normal;">°</span>C and 45<span style="white-space:normal;">°</span>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<span style="white-space:normal;">°</span>C and 45<span style="white-space:normal;">°</span>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.
