Abstract
Permeable pavement is often known as “cool road”. However, the cooling performance will be weakened due to clogging. In this paper, the temperature field distribution model of asphalt pavement was obtained by Green’s function. Gradations of porous asphalt mixture were designed to obtain different porosities, and the thermal properties of specimens with different porosities were tested and calculated. The simulation test was carried out to obtain the heating curves, which were used to verify the accuracy of the temperature model by comparing the results of the theoretical calculation to results of the test. The daily solar radiation intensity and air temperature changing functions were plugged into the model to calculate the temperature at the bottom of the middle surface. In this way, the simplified model of void fraction and cooling performance of the porous asphalt pavement was obtained. The results showed that the temperature at the bottom of the middle surface for permeable pavement was lower than that for traditional asphalt pavements. The gap was between 0.29 to 2.75 °C and it increased as the porosity of permeable pavement increased.
Highlights
As an important part of a “sponge city”, permeable pavement plays a significant role in regulating local climate, accelerating groundwater recycling and reducing runoff on road surface.Permeable pavement is known as “cool road”
The difference between the maximum temperatures of the permeable asphalt pavement and traditional asphalt pavement is defined as the cooling performance of permeable asphalt pavement
The results showed that the cooling effect of drainage asphalt increased with the temperature of permeable asphalt pavement at thelayer depth of 4 cm from and 1016.68%
Summary
As an important part of a “sponge city”, permeable pavement plays a significant role in regulating local climate, accelerating groundwater recycling and reducing runoff on road surface. The maximum temperature of asphalt pavement affects the service and safety performance. The numerical analysis method is often used to predict the temperature distribution internal to the pavement [9,10,11,12]. This method is based on finite element or finite difference method. Different from the numerical analysis method, the analytical method can be used to obtain the rigorous solutions of pavement temperature fields with appropriate assumptions. According to the analytical method, the changing rule between thermal properties and porosity of of the asphalt mixture should be studied first.
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