Study of the variation in service temperature on the rn°1 roadway in the maritime region (Togo)

Togo, like many other West African countries, does not have precise data on the nature of the temperature variation cycle on pavements, even though they are subject to an aggressive tropical climate, warm in nature. The bituminous mixes used on the roads of Togo have a viscoelastic behaviour strongly influenced by the temperature cycle within the pavements with bituminous coating, thus causing premature deformations. In order to better appreciate the influence of the variation of the temperature on the roadway in accordance with that which is taken in geotechnical laboratories in Togo, our study consisted in checking the variation of the temperature on the surface of the roadway and at 2.5 cm deep during the day on the national N°1 in the Maritime Region in Togo. The measurements were carried out using the thermocouple and the hygrometer which made it possible to have the temperatures of the roadway and the air respectively. At the end of this study, it appears that the temperature at the surface of the roadway at certain times of the day reaches a peak varying between 63.60°C to 69.30°C exceeding that taken as a reference in the laboratory which is 60°C. In addition, it was found that the observation time of the values of the temperature which remains greater than or equal to 60°C vary between two (02) and four (04) hours.