Asphalt pavement structure for alleviating urban heat island effect based on one-way heat conduction

Abstract

The invention relates to an asphalt pavement structure for alleviating urban heat island effect based on one-way heat conduction, in particular to the asphalt pavement structure which alleviates urban heat island effect by reducing the temperature of urban asphalt pavement. The pavement structure comprises two to multiple layers of structures, and is the pavement layer with a gradient thermal conductivity structure, wherein the thermal conductivity of the external layer is lower than that of the internal layer. The pavement layer has the gradient thermal conductivity structure, comprising an upper layer (4) modified by first micro-nanometer powder (1) with the thermal conductivity of 10 to 30 W / m*k, a middle layer (5) modified by second micro-nanometer powder (2) with the thermal conductivity of 50 to 90 W / m*k, and a lower layer (6) modified by third micro-nanometer powder (3) with the thermal conductivity of 100 to 140 W / m*k. The invention has the advantages of simple structure, convenient construction and low cost, and can be applied to the maintenance and the construction process of urban asphalt pavement to alleviate the urban heat island effect.

Description

technical field [0001] The invention relates to an asphalt pavement structure for alleviating the urban "heat island effect", which can effectively reduce the temperature of the asphalt pavement, reduce the power consumption of urban air conditioners in summer, alleviate the pressure of urban power supply, and is suitable for the "cool pavement" construction demand of urban roads. Background technique [0002] Because the asphalt pavement has a small albedo (0.05-0.15) and a large heat capacity (0.85-1.09J / Kg K), it is very easy to accumulate heat during the day in summer, resulting in a higher road surface temperature; and At night, the asphalt pavement releases a large amount of accumulated heat into the air near the surface in the form of infrared radiation, which is one of the main reasons for the formation of the urban "heat island effect". With the warming of the global climate and the acceleration of urbanization, the urban "heat island effect" will become more promin...

AI Technical Summary

Problems solved by technology

However, the new coating of Ripu Company still has the following problems: due to the existence of a large number of aerosol particles in the air environment of urban roads, it can absorb long-wave radiation reflected from the road surface; at the same time, objects around the road such as buildings and pedestrians will also absorb A lot of heat radiation, therefore, the heat reflected by the pavement coating is not returned to the urban outer space and still radiates out at night

[0006] There have been a lot of researches at home and abroad on the use of powder modified asphalt materials to obtain new physical functions; The thermal function, which guides the solar radiation heat of the asphalt pavement into the underground with a huge heat capacity, is still blank at home and abroad, that is, there is no corresponding patent at home and abroad for the technical method of applying the principle of "one-way heat conduction" to asphalt pavement

Images