摘要
Abstract
For the rapid proliferation of rubber asphalt,in this paper,the dynamic modulus of three different kinds of rubber asphalt mixtures were tested by AMPT asphalt mixture performance tester.The dynamic modulus |E*| and phase angle φof each mixture were measured by experiments.According to Ramberg-Osgood model,the main dynamic modulus curves of three groups of rubber asphalt mixtures were established.In addition,the dynamic modulus of the drill core sample in the field test section was tested.The test results show that:For the dynamic modulus of rubber asphalt mixture,temperature is an important factor,the lower the temperature,the higher the dynamic modulus;The dynamic modulus of three different kinds of rubber asphalt are positively correlated with the loading frequency;The increase rate is rapid in the early stage,and the increase trend is slow in the late stage.When the temperature is lower than 35℃,the phase angle of the three kinds of rubber asphalt mixture specimens decreases with the increase of frequency.When the test temperature is not less than 35℃,the phase angle of the three kinds of rubber asphalt mixture specimens increases with the increase of frequency.When the temperature is uniform,the rutting resistance factor |E*|/sinφ is ARHM-25,ARHM-20,ARHM-13 in order.The fatigue dissipation factor |E*|·sinφ is positively correlated with loading frequency;The greater the loading frequency,the more serious the fatigue failure of rubber asphalt mixture.The main curve of dynamic modulus of the mixture based on Ramberg-Osgood model has good fitting performance and high reliability.It can accurately describe the relationship between dynamic modulus,temperature and frequency of the three kinds of rubber asphalt mixtures.Concrete engineering practice can prove the accuracy of the main curve.关键词
橡胶沥青混合料/动态模量/Ramberg-Osgood模型/抗车辙因子/疲劳耗散因子Key words
rubber asphalt mixture/dynamic modulus/Ramberg-Osgood model/anti rutting factor/fatigue dissipation factor分类
交通工程
