Asphalt mixture mineral aggregate gradation composition design method using internal friction angle as design index

A technology of asphalt mixture and design index, which is applied in the field of cohesive pavement, roads, buildings, etc., can solve the problem of not being able to maximize the excellent performance of the dense structure of the skeleton, at least failing to achieve a stable skeleton structure, and affecting the stability of the skeleton structure To reduce the possibility of shear flow deformation, reduce rutting and ensure stability

Inactive Publication Date: 2017-01-25
GUANGXI TRANSPORTATION SCI & TECH GRP CO LTD
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AI Technical Summary

Problems solved by technology

The design is often carried out according to the gradation range recommended by the code, but the gradation composition range given by the code is relatively wide. In order to obtain a dense skeleton structure, a gradation curve close to the lower limit of the gradation is often selected. The selection of this gradation curve is arbitrary. It is easy to cause too much particle content of the next particle size

Method used

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  • Asphalt mixture mineral aggregate gradation composition design method using internal friction angle as design index
  • Asphalt mixture mineral aggregate gradation composition design method using internal friction angle as design index
  • Asphalt mixture mineral aggregate gradation composition design method using internal friction angle as design index

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Effect test

Embodiment 1

[0036] Taking AC-20 modified asphalt mixture as an example in the surface layer of asphalt pavement, the specific implementation method is as follows:

[0037] (1) Carry out the first-level filling test of coarse aggregates, the aggregates of 19-26.5mm and 16-19mm are mixed at 0:1, 1:4, 1:3, 1:2, 1:1, 2:1, The nine ratios of 3:1, 4:1, and 1:0 are mixed evenly, and a total weight of 20kg is taken for each ratio to conduct a shear test, and the internal friction angle of the mineral material is calculated at each ratio. The test results are as follows figure 1 As shown, when the composition ratio is 1:3, the internal friction angle is the largest, and the shear resistance is the best;

[0038](2) On the basis of the skeleton formed by the optimal filling ratio of the first level, the second level filling is carried out, and the 16-26.5mm and 13.2-16mm aggregates are 4:1, 3:2, 1:1, 2:3, The five ratios of 1:4 are mixed evenly, and the shear test is carried out in the same way, a...

Embodiment 2

[0055] Taking AC-13 modified asphalt mixture for the surface layer of asphalt pavement as an example, the specific implementation method is as follows:

[0056] (1) Carry out the first-level filling test of coarse aggregates, the aggregates of 13.2-16mm and 9.5-13.2mm are mixed at 0:1, 1:4, 1:3, 1:2, 1:1, 2:1, The eight ratios of 3:1 and 4:1 are mixed evenly, and the total weight of each ratio is 20kg for shearing test, and the internal friction angle of the mineral material is calculated at each ratio. The test results are as follows Image 6 As shown, when the composition ratio is 1:3, the internal friction angle is the largest, and the shear resistance is the best;

[0057] (2) On the basis of the skeleton formed by the optimal filling ratio of the first level, the second level filling is carried out, and the 9.5-13.2mm and 4.75-9.5mm aggregates are 4:1, 3:2, 1:1, 2:3 , 1:4 and five kinds of ratios are mixed evenly, and the shear test is carried out in the same way, and th...

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Abstract

The invention belongs to the technical field of traffic civil engineering application, and particularly relates to an asphalt mixture mineral aggregate gradation composition design method using the internal friction angle as a design index. A stage-by-stage filling theory is used; materials with the lower stage of particle diameter D1 are filled into maximum-nominal-size NMAS; by measuring the internal frictional angle phi of aggregates at different proportions, the proportion corresponding to the maximum internal frictional angle is used as an optimum composition proportion for forming the mineral stable framework; by such analogy, the optimum composition proportion relationship of each grade of coarse aggregates in the asphalt mixture can be obtained, so that a stable coarse aggregate framework structure is formed. Then, a bailey method is used for designing the fine aggregate and filling material proportion; the mineral aggregate gradation designed by the method provided by the invention realizes shearing resistance and compactness. The method has the advantages that the targeted performance is good; by aiming at the physical damage features of track damages of the asphalt pavement in Guangxi high-temperature hot and humid area, i.e., the insufficient high-temperature stability, the track-resistant asphalt mixture mineral aggregate gradation is designed; the mineral aggregate gradation has a stable framework compact structure.

Description

technical field [0001] The invention belongs to the application technical field of traffic civil engineering, and specifically relates to a method for designing the gradation composition of asphalt mixture and mineral material with the internal friction angle as the design index. Background technique [0002] The inventor has investigated the use of asphalt pavements on expressways in Guangxi: Nanyou Road, Pingzhong Road, Nanbai Road, Longbai Road, etc. The common pavement disease of several expressways is that the asphalt mixture is resistant to shearing. Mobility rutting caused by insufficient strength. Judging from the core sample structure of the pavement, the mixture is basically a dense skeleton structure, but rutting still occurs. There is a very important reason for this is the migration of the mixture skeleton, that is, the dense structure of the skeleton of the mixture is unstable. A large number of scientific research results and engineering examples show that t...

Claims

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Application Information

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IPC IPC(8): E01C7/18
CPCE01C7/18
Inventor 覃润浦李美华陈杰黄泽国庞婵
Owner GUANGXI TRANSPORTATION SCI & TECH GRP CO LTD
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