Design method of framework compact type asphalt mixture volume

Abstract

The invention provides a volume design method for asphalt mixture with skeleton dense structure, which is a method for mixture proportion design. The method comprises: step 1, according to the regulation of the current specifications, the densities of asphalt material and aggregates of various grades are determined; step 2, the void-filling rate V0, when the mixture is solely composed by the aggregate of the coarsest grade with the diameter of D0 in the asphalt material, is tested, and the theoretical gradation of the coarse aggregate is calculated; step 3, the theoretical densities and the integral density of the coarse aggregates and fine aggregates in the asphalt material are respectively confirmed; step 4, compact stacking density of the coarse aggregate and the void ratio VCA when the coarse aggregates are in a state of compact stacking are confirmed; step 5, the proper volume parameters and value of VMA and VV are chosen according to the maximum particle diameter of the asphalt material; step 6, the usage amount of the coarse aggregates, fine aggregates and asphalt in the asphalt material is determined according to the theoretical formula for asphalt mixture volume design so as to determine the mixture gradation. The completion of the volume design of the mixture is a key technical measure to improve the high-temperature property of the asphalt pavement.

Description

technical field [0001] The invention relates to a method for establishing an intuitive and clear mix ratio design of skeleton-type asphalt mixture, which belongs to the field of mix ratio design of asphalt mixture. Background technique [0002] In the past 15 years, my country's highway construction, especially the expressway construction, has entered an unprecedented era. China's expressway construction has only taken more than 10 years, and it has gone through a distance that usually takes 40 years for developed countries. In October 1988, the Shanghai-Jiajia Expressway was completed and opened to traffic, realizing the zero breakthrough of expressways in mainland my country. By the end of 1995, the expressway completed and opened to traffic had exceeded 2,000km. By the end of 1998, the expressway completed and opened to traffic reached 6,258km, ranking eighth in the world. In October 1999, the total mileage of my country's expressways opened to traffic exceeded 10,000 kil...

AI Technical Summary

Problems solved by technology

[0006] (1) The gradation composition of mineral mixtures depends on experience. Even in the Superpave design method, control points and restricted areas are only a judgment condition and cannot be a design method;

[0007] (2) There is no necessary connection between the choice of mineral mixture gradation and the determination of asphalt dosage;

[0008] (3) There is no necessary explanation on how to give full play to the intercalation ability of coarse aggregate

Images