Research On Temperature Field Of Asphalt Pavement Structure In Yunnan Province

The road which is affected by the natural environment, experience on going change's environmental combined effect.The asphalt pavement,has such features such as fast, easy maintenance and driving comfort, and has become the main road surface material. However,the asphalt material is a temperature-sensitive material, when the summer temperature is higher, the bond strength between aggregates decreases, resulting in the rut under repeated loading; when the winter temperatures plunged, the road produces the temperature cracks because of the temperature stress inside the road structure exceeding the tensile strength of materials.For these reasons, we should research the temperature distribution in asphalt pavement, thereby to enhance the high and low temperature performance of road, to increase the service life of the road.This paper, according to analysis asphalt pavement on the impact of environmental factors,conclude that the impact of temperature and solar radiation is the major factor on asphalt pavement temperature distribution.By measuring air temperature, solar radiation in order to-day variation of a cycle of analysis, temperature and solar radiation were fitted.To the basic theory of heat conduction theory,to the boundary conditions of temperature and solar radiation effect on the road,soving the basic equation of heat conduction, arrive at analytical solution of asphalt pavement temperature field model.Through the air temperature and solar radiation measurement, and reasonable values of the road surface material thermal physical parameters, using the finite element structure, research temperature distribution on the asphalt pavementTo Dali region of Yunnan in winter typical weather of two-dimensional plane strain condition, the steady-state temperature field and transient temperature field distribution and diurnal variation of the road structure are analyzed in the major moment of one day in detail.As asphalt pavement temperature field model in practical engineering application, this paper zones the temperature districts of Yunnan Province, calculates the changes of road pavement structure inside 4cm?6cm?8cm?10cm change each month within a year through the road temperature field model,through statistical analysis derives the Changes of asphalt pavement along the depth in each temperature of area in Yunnan Province.