Structural Mechanics Analysis of AC-13 Cold Mix Asphalt Surface Based on ABAQUS
[Purposes]Based on the road performance test of cold-mixed cold-laid asphalt mixture,the structural mechanics of the existing pavement surface is analyzed,which provides a reference for the se-lection of pavement structure types under the action of light traffic in rural roads.[Methods]ABAQUS fi-nite element software was used to select the surface materials as cold-mixed cold-spread asphalt mix-ture,cold-mixed cold-spread asphalt mixture(70%RAP)and hot-mixed asphalt mixture.The finite ele-ment model of typical pavement structure was established.Under the action of standard load,the me-chanical parameters of different surface materials on typical pavement structure were calculated.Check the fatigue cracking life of the inorganic binder stability layer,the permanent deformation of the asphalt mixture layer,and the vertical compressive strain of the top surface of the subgrade to check the pave-ment structure.Check the low temperature cracking of the asphalt surface in the seasonal frozen soil area.[Findings]The results show:structure 3<structure 1<structure 2 in the bending value analysis,struc-ture 3<structure 1<structure 2 in the base layer tensile stress analysis,the permanent deformation of AC-13 cold mix and cold laying mixture was less than 15.7 mm in light traffic and less than 19.26 mm in medium traffic,and the cracking index of asphalt surface was 3.37.[Conclusions]Under the action of light traffic in rural highway,5 cm cold mix cold spread(RAP)asphalt mixture was selected.Under me-dium traffic,choose 5 cm cold mix cold spread asphalt mixture.Considering overload and heavy load,cold mix asphalt mixture can not meet the requirements of road use.
ABAQUSRAPpermanent deformationfatigue cracking life
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