Test and Simulation Study of Characteristics of Material of Asphalt Pavement Structure Under Special Loading

Author(s):
F. Ding, L. C. Cai, S. J. Cao, Y. Qiao, & X. C. Wang

Source:
F. Ding, L. C. Cai, S. J. Cao, Y. Qiao, & X. C. Wang, Test and Simulation Study of Characteristics of Material of Asphalt Pavement Structure Under Special Loading, Journal of Mechanical Engineering Research and Developments, vol. 40, no. 1, pp. 47-56, 2017.

ABSTRACT: Taking the material of asphalt pavement structure as the study object, the present study studied the influencing rule of special loads such as static load and dynamic load on the compressive strength and resilient modulus of asphalt mixture and cement stabilized macadam, and analyzed the influencing rule of ambient temperature on the mechanical property of material. The results showed that: when the ambient temperature was below 45℃, the compressive strength and resilient modulus of asphalt mixture decreased rapidly with the increase of temperature; when the ambient temperature was above 45℃, the compressive strength and resilient modulus of asphalt mixture changed slowly. The unconfined compressive strength of cement stabilized macadam increased with the increase of cement dosage, and the compressive resilient modulus of cement stabilized macadam showed a rising trend with the increase of cement dosage, but the difference was not significant; the flexural tensile elastic modulus increased with the increase of age. The dynamic modulus of asphalt mixture increased with the increase of loading frequency, however, the increasing speed of dynamic modulus value decreased evidently with the further increase of loading frequency, and then gradually leveled off. The dynamic modulus decreased evidently with the increase of temperature. The dynamic modulus increased with the increase of load and had certain stress dependence; the dynamic modulus of cement stabilized macadam increased significantly with the increase of cement dosage.Simulation analysis was conducted for the surface deflection of asphalt pavement, stress of surface layer bottom, stress of layer bottom of cement stabilized macadam layer as well as influencing range of load by using the ABAQUS software, providing theoretical guidance for the design of asphalt pavement structure.

Keywords: Asphalt mixture; Cement stabilized macadam; Special load; Temperature; Resilient modulus; Compressive strength.