Permanent deformation characteristic of asphalt mixture under coupling effect of moisture, overload and loading frequency.

• The permanent deformation of asphalt mixture under coupling effect was discussed. • Effect of moisture, overload and low loading frequency needs to be considered. • Anti-rutting agent PR with dosage of 0.45% was recommended for asphalt mixture. To evaluate the influence of vehicle load and driving speed on permanent deformation characteristic of asphalt mixture in high temperature and rainy areas, the Hamburg wheel tracking test was conducted under different test conditions by changing the wheel load, loading frequency and test environment. The permanent deformation characteristic of asphalt mixture under coupling effect of moisture, overload and loading frequency was discussed. Meanwhile, three kinds of anti-rutting agents commonly used in engineering were selected, and the influence of various anti-rutting agents on permanent deformation characteristic of asphalt mixture was also studied by rutting test and Hamburg wheel tracking test. The results show that the moisture, load and loading frequency are important factors affecting the permanent deformation characteristic of asphalt mixture. Under coupling effect of moisture, overload and low loading frequency, the ability of asphalt mixture to resist the generation and development of permanent deformation is poor. The influence of coupling effect of moisture, overload and low loading frequency needs to be considered when evaluating the anti-rutting performance of asphalt mixture. After the addition of anti-rutting agent, the dynamic stability of asphalt mixture increases significantly first, and then tends to be gentle when the dosage of anti-rutting agent exceeds 0.45%. The difference of improvement effect of various anti-rutting agents on rutting resistance of asphalt mixture is obvious, and the improvement effect is in order of PR. PLASTS (PR) > RESIN ALLOY (RA) > Duroflex (Df). The anti-rutting agent PR with dosage of 0.45% is recommended to improve the resistance of asphalt mixture to permanent deformation. The research results can provide some references for improving the rutting resistance of asphalt pavement in high temperature and rainy areas. [ABSTRACT FROM AUTHOR]