TITLE:
Influence of the Temperature on Coated Bituminous of Road Structures in Senegal (West Africa)
AUTHORS:
Birame Diouf, Adama Dione, Papa Sanou Faye, Khalil Cissé
KEYWORDS:
Asphalt Mixes, Coated, Senegal, Thermo, Susceptibility, Performance, Dimensioning
JOURNAL NAME:
Open Journal of Civil Engineering,
Vol.10 No.4,
December
10,
2020
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.