Research On Thermal Physical Parameters Of Asphalt Mixture

Thermal physical parameters of materials are usually regarded as constant in analysing temperature field and temperature stress.But they changed with temperature and material type,so the measurement of thermal physical parameters in different temperature condition is needed.In this paper, the research of the thermal physical parameters include:specific heat capacity, coefficient of thermal conductivity, the linear contractive modulus.The main research contents and research conclusions are as follows:Development and calibration of the test system of asphalt mixture specific heat capacity. Through testing the specific heat capacity of asphalt, aggregate, asphalt mixture find the influence of asphalt and aggregate in asphalt mixture specific heat capacity. Parallel model is better to simulate specific heat capacity of asphalt mixture through comparing with others.Test the coefficient of thermal conductivity of asphalt, aggregate,and asphalt mixture find the influence of aggregate, the influence of air void. Analyzed the temperature variation to the influence of the coefficient of thermal conductivity. Parallel model is better to simulate specific heat capacity of asphalt mixture through comparing with others. linear contractive modulus of asphalt mixture are measured with strain gage methord and find that influence of asphalt type is greater than air void and aggregate. Temperature changes on linear contractive modulus is great.Temperature field is estimated through finite element model. So the measurement of thermal physical parameters in different temperature condition is importent.