Method for evaluating crack resistance of graphene modified asphalt

Abstract

The invention discloses a method for evaluating the crack resistance of graphene modified asphalt, and belongs to the technical field of mechanical property evaluation of modified asphalt. The method comprises the following steps: 1, dividing matrix asphalt into four components, and calculating the weight ratio of each component; 2, calculating to obtain the number of each component molecular model in the asphalt molecular model; 3, constructing a graphene modified asphalt blending system molecular model; 4, enabling each graphene modified asphalt blending system molecular model to reach a balanced and stable state; 5, obtaining the shear modulus G of the model; 6, obtaining the adhesion work Wcohesion of the model; 7, obtaining a self-diffusion coefficient delta of the model; and 8, determining a judgment matrix, constructing a model about evaluation of the anti-cracking performance of the graphene modified asphalt, and calculating the anti-cracking performance of the graphene modified asphalt with the corresponding mixing amount by combining the shear modulus, the adhesion work and the self-diffusion coefficient. Through molecular dynamics simulation, the influence of the graphene doping amount on the anti-cracking performance of the graphene modified asphalt is more scientifically and intuitively represented.

Description

technical field [0001] The invention belongs to the technical field of evaluating the mechanical properties of modified asphalt, and more specifically relates to a method for evaluating the crack resistance of graphene-modified asphalt. Background technique [0002] With the prosperity and development of transportation and the increase of traffic volume, asphalt pavement is facing more and more challenges, including continuous high temperature caused by global warming, heavy traffic, etc., causing a large number of ruts, wrapping, cracks, Loosing and other diseases, among which rutting is particularly serious in expressway diseases, in order to solve the above problems, modifying asphalt materials to improve their performance is a common method at present. The study of modifiers has also become a research hotspot. The current research results mainly include rubber and thermoplastic elastomer modified asphalt, plastics and synthetic resin modified asphalt, blended polymer mod...

AI Technical Summary

Problems solved by technology

[0004] At present, domestic and foreign research on graphene in the field of roads mainly includes macroscopic tests such as three major indicators, dynamic shear rheological tests, and microscopic tests such as infrared spectroscopy and atomic force microscopy. There are few studies, and the quality and parameters of graphene are not the same, and the research conclusions obtained are not completely consistent

The microscopic test is more about the static research of asphalt, and lacks the observation of dynamic changes. Therefore, the current methods for evaluating the crack resistance of graphene-modified asphalt have certain limitations.

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