Method for evaluating self-repairing performance of nano graphene oxide modified asphalt mixture

Abstract

The invention provides a method for evaluating self-repairing performance of a nano graphene oxide modified asphalt mixture, belongs to the technical field of asphalt pavement self-repairing, and solves problems that self-repairing efficiency of the conventional asphalt mixture is low; and a heating self-repairing evaluation system is difficult to reveal a change rule of a self-repairing behaviorof the asphalt mixture along with chemical components and temperature gradient distribution. The method comprises the following steps: firstly, preparing a semi-cylindrical test piece from an asphaltmixture modified by nano graphene oxide; then, based on a temperature gradient distribution characteristic, carrying out heating self-repairing on the test piece subjected to semicircular bending damage in a microwave and induction heating mode; and finally, evaluating the self-repairing performance of the asphalt mixture by adopting different self-repairing indexes on the basis of macrocosmic andmicrocosmic layers, and determining the optimal mixing amount and the optimal self-repairing heating mode of the nano graphene oxide. According to the method, the self-repairing performance of the asphalt pavement can be improved, manpower and material resources for pavement maintenance are saved, the service life of the asphalt pavement is prolonged, and sustainable development and constructionof the asphalt pavement are promoted.

Description

technical field [0001] The invention relates to a method for evaluating the self-repair performance of a nano-graphene oxide modified asphalt mixture, which belongs to the technical field of asphalt pavement self-repair. Background technique [0002] Most roads in my country use asphalt pavement. Asphalt pavement has many advantages, such as: sufficient mechanical properties, can withstand heavy traffic; smooth surface without joints, comfortable and safe driving, stable and noise reduction; certain elastic-plastic deformation ability , strong adaptability; no dust on the surface, easy to clean and clean. However, during use, due to repeated loads and the comprehensive influence of environmental factors, asphalt pavement will gradually produce fatigue cracks. These damages often exist inside the asphalt pavement material. If they cannot be found and repaired in time, the pavement will be damaged The discontinuity and uneven stress distribution of materials and structures wil...

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a method for evaluating the self-repair performance of nano-graphene oxide modified asphalt mixture, which solves the problem of low self-repair efficiency of traditional asphalt mixture and the The self-repair evaluation system is only based on the overall strength and average temperature level, and it is difficult to reveal the change law of the self-repair behavior of asphalt mixture with the distribution of chemical composition and temperature gradient.

[0011] In view of the current high cost of asphalt pavement maintenance and the low self-repair efficiency of traditional asphalt mixtures, the present invention adopts Induction heating and microwave heating are used to evaluate the self-repair performance of nano-graphene oxide-modified asphalt mixture, and a method for evaluating the self-repair performance of nano-graphene oxide-modified asphalt mixture is provided, thereby reducing the generation of asphalt pavement cracks and improving The service life of asphalt pavement saves human and material resources for pavement maintenance