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Design method of a high-toughness ultra-thin asphalt wear layer mixture

A technology of asphalt mixture and design method, which is applied in design optimization/simulation, computer-aided design, calculation, etc., and can solve problems such as inability to match the design concept of high-toughness and ultra-thin asphalt wearing layers

Active Publication Date: 2020-09-08
SOUTH CHINA UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a design method of high-toughness ultra-thin asphalt wear layer mixture to solve the problem that the existing conventional asphalt mixture design method cannot match the design concept of high-toughness ultra-thin asphalt wear layer

Method used

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  • Design method of a high-toughness ultra-thin asphalt wear layer mixture
  • Design method of a high-toughness ultra-thin asphalt wear layer mixture
  • Design method of a high-toughness ultra-thin asphalt wear layer mixture

Examples

Experimental program
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Effect test

Embodiment 1

[0098] The flow chart of GT-8 gradation design process of high toughness ultra-thin asphalt wear layer is as follows: figure 1 As shown, the steps are as follows:

[0099] 1. Conduct conventional asphalt performance testing and rheological performance testing on high-viscosity and high-elasticity modified asphalt. The test results are shown in Table 2:

[0100] Table 2 Performance test results and technical requirements of high-viscosity and high-elasticity modified asphalt

[0101]

[0102] The screening results of the diabase used in this gradation design are shown in Table 3:

[0103] Table 3 Screening results of mineral materials of various specifications

[0104]

[0105]

[0106] 2. Coarse aggregate specifications are divided into 3-5mm specification materials and 5-8mm specification materials. Adjust the admixture ratio between the two grades of coarse aggregate to 3~5:5~8=1:3, and use the dry pounding method to test that the compact density of the coarse ag...

Embodiment 2

[0125] The GT-5 gradation design process of high-toughness ultra-thin asphalt wear layer, the steps are as follows:

[0126] 1. Conduct conventional asphalt performance testing and rheological performance testing on high-viscosity and high-elasticity modified asphalt. The test results are shown in Table 5:

[0127] Table 5 Performance test results and technical requirements of high-viscosity and high-elasticity modified asphalt

[0128]

[0129] The screening results of the diabase used in this gradation design are shown in Table 6:

[0130] Table 6 Screening results of mineral materials of various specifications

[0131]

[0132] 2. The tight packing density of coarse aggregate is 1.81g / cm2 by dry pounding test 3 , combined with the aggregate density to calculate the coarse aggregate void ratio VCA DRC . The result of the calculation is VCA DRC = 38.5%.

[0133] 3. Preliminarily set the amount of asphalt to 6.98% (that is, the asphalt ratio is 7.5%), the amount of m...

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Abstract

The invention provides a design method of a high-toughness ultrathin asphalt wearing layer mixture, and belongs to the technical field of road engineering. The invention provides a brand new dual design principle that VCAmix is less than or equal to VCADRC and the thickness of the asphalt film is more than or equal to 15m; a coarse skeleton volume distribution method is combined; road performanceverification is combined and design correction is guided; the mixed material design of the high-toughness ultrathin asphalt wearing layer is more purposeful; Standardization and flexibility, VCAmix <= VCADRC and the thickness of the asphalt film are controlled to be greater than or equal to 15m; and the framework embedding and extruding stabilizing effect and the strong anti-cracking effect of ahigh-asphalt oil film are emphasized, it is ensured that the mixture has the good structural performance of track deformation resistance, fatigue cracking resistance and shear deformation resistance,and the functional attributes of the pavement such as the anti-sliding performance, the noise reduction performance, the dense water performance and the flatness can be remarkably improved.

Description

technical field [0001] The invention relates to the technical field of road engineering, in particular to a design method of a high-toughness ultra-thin asphalt wear layer mixture. Background technique [0002] As a structural layer directly in contact with passing vehicles and the natural environment, the wear layer on the surface cannot be guaranteed under the influence of load, sunshine, precipitation and temperature changes. Usually, it needs to be replaced regularly every 5 to 10 years. Moreover, for asphalt wear layers with a thickness of 4-5 cm, such as AC-13, AC-16, SMA-13, etc., the end-of-life wear rate (1-2 mm) will be much smaller than the thickness of the structural layer itself, which is regarded as After milling, it will cause a huge waste of high-quality stone and asphalt binder resources. At the same time, due to its thick construction structure, it often cannot meet the application requirements in the road maintenance process. For example, there are applic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/20G06F119/04
CPCG06F30/20G06F2119/04
Inventor 虞将苗陈富达
Owner SOUTH CHINA UNIV OF TECH
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