الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
The solar radiation can make the road surface temperature increased, but the impact of solar radiation on the asphalt pavement temperature will be having the greatest effect. The daily solar radiation changes with the sun’s position, in the absence of dark clouds, the solar radiation will reach the maximum in July 21st, and in December 21st reached the minimum value. The altitude of the position will also affect the amount of solar radiation. In the summer, the amount of daily solar radiation in the north and the south is the same, but the intensity of the solar radiation in the South will be even greater. The difference in the intensity of solar radiation per hour will increase the gap between the temperature and the road surface temperature. So the maximum radiation intensity and the total amount of solar radiation are equally important to the pavement temperature. The objectives of this study were to determine the effect of solar radiation on the behavior of asphaltic layers of pavement, the color of surfaces also affects surface temperatures by affecting the albedo of a material. Darker surfaces absorb more solar radiation and have low albedo, while lighter surfaces reflect more light and have higher albedo. 1. The effect of the angle of solar radiation is more effective than the temperature of it on the pavement temperature. 2. Specific heat is the energy needed to raise a unit mass of a substance by one unit of temperature, typically expressed in units of J/kg•K. The specific heat of dense-graded asphalt and concrete are very similar, being about 900 J/kg•K. 3.High air temperature requires greater overlay thickness to resist pavement deformation take place in summer conditions.