Method for designing AC-20 asphalt mixture

Abstract

The invention discloses a method for designing an AC-20 asphalt mixture, which adopts a vertical vibrating method to design and comprises the steps of selecting and testing raw materials, designing mineral aggregate gradation, determining the optimal asphalt-aggregate ratio, testing performance and the like. Experimental verification shows that the asphalt mixture designed by the method has good pavement performance and a small use quantity of asphalt and is simple and convenient to operate; and asphalt can be saved by 8 percent to 10 percent.

Description

technical field [0001] The invention belongs to the application technical field of traffic civil engineering, and relates to a VVTM design method of AC-20 asphalt mixture. The design method can reduce the amount of asphalt, improve the road performance of the asphalt mixture, is easy to operate, and is suitable for large-scale popularization and application. Background technique [0002] At present, the design methods of AC-20 asphalt mixture mainly include Marshall method, GTM method and Hveem method. The expensive equipment used by the GTM method is not conducive to popularization; the design results of the Hveem method have poor correlation with the field. At present, the Marshall method is still the main method for asphalt mixture design in most countries. [0003] my country's AC-20 asphalt mixture generally adopts the Marshall design method in "Technical Specifications for Construction of Highway Asphalt Pavement" (JTG F40-2004) (referred to as JTG F40-2004), and the ...

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Problems solved by technology

[0013] (1) The forming method of the Marshall design method cannot accurately simulate the compaction effect of the wheels on the road surface

There is no internal relationship between compaction work and traffic volume, and the density of the formed test piece cannot reflect the density of the road after it has been opened to traffic for many years, and the physical and mechanical properties of the test piece do not match the actual road surface;

[0014] (2) The Marshall design method is no longer suitable for the needs of modern transportation development

The various technical standards of the current Marshall method for designing asphalt mixtures were proposed based on the traffic volume in the early 1980s, but the current traffic conditions of arterial highways have undergone significant changes, showing the characteristics of "large flow and heavy axle load" Obviously, the various technical standards proposed by the Marshall Act can no longer meet the current traffic requirements for road performance.

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