Abstract
In order to study the high temperature performance of LM-S modified asphalt mixture and SBS modified asphalt mixture, repeated loading creep test was used to study the influence of temperature and deviatoric stress on the axial permanent deformation of the two kinds of asphalt mixture. At the same time, Permanent deformation, ε@5000, flow number FN and creep rate were select to evaluation of high temperature performance from different directions. The results show that the ε@5000 and creep rate are failed in the condition of high temperature and large deviatoric stress, so it hast widely practicable. The flow number FN is also limited by the conditions, which leads to the distortion of the flow number at lower temperature and smaller deviatoric stress so it is not easy to direct used as the evaluation index. Axial permanent deformation can reflect the permanent deformation in different cycles which is an excellent index to evaluate the high temperature performance of the two kinds of asphalt mixture, it is recommended to use axial permanent deformation to compare the LM-S modified asphalt mixture and SBS modified asphalt mixture The experimental results show that the axial permanent deformation of the LM-S modified asphalt mixture is always less than that of SBS modified asphalt mixture,it indicating that the high temperature rutting resistance of the LM-S modified asphalt mixture is better than that of SBS modified asphalt mixture.
Highlights
As one excellent modified asphalt mixture, SBS modified asphalt mixture, has always been favored by road workers
In order to solve the problems of SBS modified asphalt, such as easy segregation, high requirements in transportation and storage etc, the LM-S modified asphalt mixture which studied by road workers is the obtained corresponding asphalt mixture by dry-mixed
The results showed that the high-temperature performance of asphalt mixture produced by dry mixing method is better than that of asphalt mixture produced by wet mixing method
Summary
As one excellent modified asphalt mixture, SBS modified asphalt mixture, has always been favored by road workers. In order to solve the problems of SBS modified asphalt, such as easy segregation, high requirements in transportation and storage etc, the LM-S modified asphalt mixture which studied by road workers is the obtained corresponding asphalt mixture by dry-mixed. It could save investment cost greatly for no requirement of modified asphalt production equipment addition[5]. In order to compare the high-temperature performance of LM-S modified asphalt mixture and SBS modified asphalt mixture, and to find suitable hightemperature performance evaluation indicators, the following research is carried out. Technical indicators Apparent density/ (g/cm3) Water content/% Particle size range/%
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