Aging Behavior and Creep Characteristics of CACB

更新时间:2023-05-28

【摘要】Cement asphalt composite binder(CACB) is a type of composite binder composed of cement, asphalt, water, and various additives through curing, whose creep properties are influenced by asphalt aging. By CACB creep tests at various aging times, the creep compliance curves of the material were obtained. Curves of the test results were fitted by the creep compliance of Burgers model revised by fractional derivative, and the effects of asphalt aging and mix proportions on the CACB creep properties were analyzed. This study demonstrates that as aging time increased, the ability of the CACB to resist instant elastic deformation and viscous flow deformation was enhanced, the amount of its elastic components increased but the viscous components were reduced, and the material deformability decreased, exhibiting deforming properties similar to elastic materials. The effects of asphalt aging on the CACB viscoelastic mechanical properties were great during the initial aging stage(within 12 h) and became weaker during the later aging stage(over 12 h). During the initial aging stage, the CACB creep deformability could be enhanced by increasing asphalt application. However, during the later aging stage, asphalt application had little effect on creep deformability.

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