Framework type asphalt mixture gradation design method

A technology of asphalt mixture and design method, which is applied in the field of gradation design of asphalt mixture, can solve the problems of cumbersome design process, lack of skeleton judgment, etc., and achieve the effect of good high temperature stability and strong anti-rutting ability

Inactive Publication Date: 2009-07-29
SOUTHEAST UNIV
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Problems solved by technology

In the existing gradation design theory, the maximum compactness is usually taken as the gradation design goal, and the judgment of the skeleton composition is lacking; the Bailey method is a gradation design method that takes the skeleton com

Method used

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  • Framework type asphalt mixture gradation design method
  • Framework type asphalt mixture gradation design method
  • Framework type asphalt mixture gradation design method

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Embodiment Construction

[0021] 1. Skeleton support model of asphalt mixture

[0022] When particles of different particle sizes are mixed, the contact state between particles can be adopted as figure 1 The three-dimensional model shown is described. Assuming that the shape of the mineral material particle is a sphere, when the coarse particle with the particle size D is wrapped by the fine particle with the particle size d, the number of contact points between the coarse particle and the fine particle depends on the The number of fine particles that can be arranged on the surface. The fine particles distributed on the surface of the coarse aggregate contact each other and cover the surface of the coarse aggregate; connect the centers of the three contacting fine particle spheres to form an equilateral triangle, and the side length of the triangle is approximately equal to the particle diameter d of the fine particles . It can be seen that the spherical surface of a virtual sphere whose diameter is...

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Abstract

The invention relates to a method for designing graduation of a dense-framework type asphalt mixture, and belongs to a method for designing the graduation of a mixture. The method comprises the following: step one, determining the volume filling rate V0 of coarsest aggregate of which the diameter is D0 in the asphalt mixture when the coarsest aggregate solely forms the mixture; step two, after the sole filling rate of the coarsest aggregate is determined, according to V1=V0/((1+d1/D0)), calculating the volume filling rate of the coarsest aggregate in a system of coarse and fine aggregates of which the diameters are D0 and d1; step three, according to the formula, after the V1 of the D0 is deducted, calculating the volume filling rate of the coarsest aggregate in the system of the coarse and fine aggregates of which the diameters are d1 and d2; and step four, repeating the step two and the step three till the last grade of the fine aggregate of the asphalt mixture. The method provides reasonable design steps for the graduation of the dense-framework type asphalt mixture, and is an important technical measure for improving the high-temperature property of asphalt pavement.

Description

technical field [0001] The invention belongs to the field of gradation 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 kilometers. By the end of 2000, the total mileage of expressways opened to traffic reached 16,000 kilometers, ranking th...

Claims

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Application Information

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IPC IPC(8): C04B26/16C04B14/02
Inventor 赵永利黄晓明
Owner SOUTHEAST UNIV
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