Li X.,Chongqing Jiaotong University |
Li X.,Meteorological Disaster Prevention of Land Transportation National Engineering Laboratory |
Liang N.-X.,Chongqing Jiaotong University |
Chen L.,Meteorological Disaster Prevention of Land Transportation National Engineering Laboratory
Chang'an Daxue Xuebao (Ziran Kexue Ban)/Journal of Chang'an University (Natural Science Edition) | Year: 2014
Through dynamic modulus test at different temperatures and different frequencies of two asphalt concretes using simple performance tester, dynamic modulus master curves and parameters of shift factor at different reference temperatures were obtained according to time-temperature equivalence principle and WLF empirical formula. Based on the Arrhenius viscosity equation, a new time-temperature equivalence equation was deduced. The expressions of empirical parameter C1 and C2 were in WLF empirical formula proposed and proved by dynamic modulus test results of asphalt concretes. The results show that temperature and frequency have the same influence on the dynamic modulus, but the variation of the phase angle depends on the temperature status. The empirical parameter C1 and C2 are related to glass transition temperature T8 and activation energy ΔE0 in WLF formula C1 decreases and C2 increases while the reference temperature rises, which can be explained by the deduced time-temperature equivalence equation. The study can provide reference for dynamic characteristics tests on other asphalt mixtures.