Anti-shear fatigue asphalt mixture grading and optimizing method based on virtual repeated penetration test

Abstract

The invention discloses an anti-shear fatigue asphalt mixture grading and optimizing method based on a virtual repeated penetration test. The anti-shear fatigue asphalt mixture grading and optimizingmethod comprises the following steps: firstly fitting through a uniaxial creep compression test result of asphalt mortar, thus obtaining 30 DEG C asphalt mortar viscoelasticity parameters of a contactmodel; then carrying out virtual repeated shear fatigue test, repeating uniaxial penetration test through simulating asphalt mixture, determining the ineffective acting frequency N of the asphalt mixture under the action of repeated penetration, and evaluating the shear fatigue life of the asphalt mixture. According to the anti-shear fatigue asphalt mixture grading and optimizing method disclosedby the invention, an asphalt mixture shear fatigue test three-dimensional discrete element model according with target grading is randomly generated in three-dimensional discrete element software, and then grading and optimizing can be carried out according to a mechanical test value simulation result of the asphalt mixture, so that the anti-shear fatigue asphalt mixture grading and optimizing method has very strong operability, convenience and representativeness, and has a great significance in improving the pavement performance of an asphalt pavement and prolonging the service life of the asphalt pavement.

Description

technical field [0001] The invention belongs to the field of road engineering, and in particular relates to a gradation optimization method for anti-shear fatigue asphalt mixture based on a virtual repeated penetration test. Background technique [0002] Fatigue damage refers to the failure of the asphalt pavement after the number of repeated loads acting on the pavement exceeds a certain value during the use of the asphalt pavement. As the main failure form of heavy-duty traffic asphalt mixture pavement, shear fatigue failure has the characteristics of bottom-up failure. In the existing asphalt mixture fatigue test research, the bending fatigue is the main one, and there are few studies on the shear fatigue. However, shear fatigue failure of asphalt pavement is entirely possible, and under high temperature conditions, the pavement is more prone to fatigue failure when it is subjected to repeated shear stress. Therefore, research on shear fatigue failure is also necessary....

AI Technical Summary

Problems solved by technology

In recent years, although there are many studies based on the discrete element method or numerical image processing technology to describe and evaluate the performance of asphalt mixtures, these studies are not comprehensive, not comprehensive enough, and rely on indoor test methods. Cannot conveniently optimize asphalt mixture gradation

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