Research On Thermophysical Characteristic Of Asphalt Mixture

Asphalt mixture is a kind of viscoelastic material, its stress and characteristic change with temperature, so that bearing capacity of pavement structure changes. In different temperature conditions, asphalt pavement will have many diseases, such as rutting, cracking and so on. The traditional ways that are used to enhance stress, if we can control temperature, we will strengthen pavement performance and service life, and reduce"urban heat island". In this paper, based on thermophysical characteristic of asphalt mixture I have research form four subjects:Firstly, the article analyzes that thermal conductivity of aggregate has effect on thermal conductivity of asphalt mixture by tow formulas. The article adopts Williamson formula and thermology formula, the result shows that thermal conductivity of aggregate has relation to linear with thermal conductivity of asphalt mixture.Secondly, the article analyzes that thermal conductivity of asphalt mixture has effect in asphalt pavement temperature field. By analyzing facts of asphalt pavement temperature field, the article brings up that only changing thermal conductivity of asphalt mixture can change asphalt pavement temperature field actively. At the same time, it shows that thermal conductivity of asphalt mixture has relations to analogous conic section with asphalt pavement temperature fieldThirdly, the article designs heat experiment. It measure thermal conductivity and specific heat by heat transfer in unstable state. The result shows thermal conductivity of aggregate has effect on thermal conductivity of asphalt mixture.At last, carry out outside experiment, in order to test and verify that thermal conductivity of asphalt mixture has effect in asphalt pavement temperature field. Analyzing insulating heat characteristic of ceramics and earthenware sand, and the article brings up thermal resistance as insulating heat index.