Asphalt surface layer layer-to-layer mechanical friction strength test device and method

A technology for testing the strength of asphalt pavement, which is applied in the direction of measuring devices, strength characteristics, and using stable shear force to test the strength of materials, etc., can solve the problems such as the difficulty of measuring the mechanical friction strength between layers, and achieve a simple and easy test device The practical and theoretical prediction method is concise and clear, and the effect of ensuring the quality of service

Active Publication Date: 2019-01-01
LANZHOU UNIVERSITY OF TECHNOLOGY
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AI Technical Summary

Problems solved by technology

However, due to the complex interlayer contact conditions of asphalt pavement and the influence of adhesive layer materials, it is difficult to measure the interlayer mechanical friction strength, so it is impossible to optimize the interlayer mechanical friction performance by selecting the upper and lower layer gradation combination types in a reasonable way , therefore, it is necessary to evaluate the interlayer mechanical friction strength characteristics of asphalt pavement under two types of gradation combinations by means of a test device and method for interlayer mechanical friction strength of asphalt pavement, so as to optimize the interlayer mechanical friction strength of asphalt pavement. Shear performance, so that the completed asphalt pavement maintains a good state of use and guarantees its service quality

Method used

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  • Asphalt surface layer layer-to-layer mechanical friction strength test device and method
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  • Asphalt surface layer layer-to-layer mechanical friction strength test device and method

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Experimental program
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Effect test

preparation example Construction

[0027] (2) Preparation and installation of interlaminar shear specimens;

[0028] (3) Selection and setting of test parameters;

[0029] (4) Start the loading device and determine the peak value of the vertical load when the specimen is sheared.

[0030] In the above test method (1), the calculation method of interlayer mechanical friction strength is as follows:

[0031] (1) Determination of fractal dimension of rough surface of asphalt mixture with two gradation types;

[0032] The fractal dimensions of the rough surface of the two graded asphalt mixtures are obtained by fitting the logarithmic function curve of the mineral aggregate gradation parameters according to formula (1):

[0033]

[0034] In the formula: P(r) is the percentage of the r grade aggregate passing through the aggregate screening process; M(r) is the total mass / g not greater than the size r; M 0 is the total mass of aggregate in the system / g; r is the particle size of a certain level of aggregate / mm...

Embodiment 1

[0063] The AC-13 and AC-16 graded asphalt mixtures commonly used in asphalt pavement were selected, and the fitting parameters of the two asphalt mixture gradation curves were obtained according to the mix ratio design test. The results are shown in Table 1 and Table 2, respectively:

[0064] Table 1 AC-13 asphalt mixture gradation curve parameter fitting table:

[0065]

[0066] Table 2 AC-16 asphalt mixture gradation curve parameter fitting table:

[0067]

[0068] According to the fitting results of Table 1 and Table 2, two logarithmic curves of AC-13 and AC-16 graded asphalt mixtures are drawn, see the attached Figure 6 , attached Figure 7 , and then determine the fractal dimensions of the rough surface of the two graded asphalt mixtures according to formula (1): D 13 = 1.4919; D 16 = 1.4939.

[0069] The fractal dimension D of rough surface of AC-13 and AC-16 graded asphalt mixture 13 = 1.4919; D 16 = 1.4939 respectively substituted into formula (2), under t...

Embodiment 2

[0077] Similarly, two graded asphalt mixtures of AC-13 and AC-20 commonly used in asphalt pavement were selected, and the fitting parameters of the two asphalt mixture gradation curves were obtained according to the mix ratio design test. The results are shown in Table 1 and Table 4, respectively.

[0078] Table 4 Fitting table of AC-20 asphalt mixture gradation curve parameters:

[0079]

[0080] According to the fitting results of Table 1 and Table 4, two logarithmic curves of AC-13 and AC-20 graded asphalt mixtures are drawn, see the attached Figure 6 , attached Figure 8 , and then determine the fractal dimensions of the rough surface of the two graded asphalt mixtures according to formula (1): D 13 = 1.4919; D 20 = 1.4948.

[0081] The fractal dimension D of rough surface of AC-13 and AC-20 graded asphalt mixture 13 = 1.4919; D 20 = 1.4948 respectively substituting into formula (2), and under the condition that the dimension is 1, the effective contact area betwe...

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Abstract

The invention discloses an asphalt surface layer layer-to-layer mechanical friction strength test device and method. The test device comprises a temperature control mechanism, a loading mechanism, a shearing mechanism, an operation control mechanism and a specimen molding mold. The test method comprises the steps of (1) a calculation method of layer-to-layer mechanical friction strength; (2) preparing and installing a layer-to-layer shearing specimen; (3) selecting and setting test parameters; (4) starting a loading device and determining a vertical load peak value during a specimen shearing failure. By means of the device, a layer-to-layer mechanical friction strength value of a asphalt surface layer under two grading combination types can be effectively obtained so that a grading combination type can be reasonably designed, the asphalt surface layer layer-to-layer anti-shearing performance is optimized, a good use state of a built asphalt pavement is maintained, and the service quality of the asphalt pavement is guaranteed, so that the method has important significance in designing and construction of an asphalt pavement grading combination type.

Description

technical field [0001] The invention belongs to the field of road engineering, and relates to a device and method for testing the mechanical friction strength between layers of asphalt pavement, which is used for evaluating the mechanical friction strength of the asphalt pavement under the condition of effective contact between layers under the influence of gradation combination type. Background technique [0002] With the development of urban-rural integration, the mileage and scale of high-grade highways are increasing day by day. Asphalt pavement, as the main form of high-grade pavement in my country, occupies a dominant position in road construction in China because of its many advantages. [0003] Since the asphalt surface layer is laid on the top of the pavement structure layer, it is directly affected by the vehicle load and the external environment, so its disease is also more prominent, especially in the long longitudinal slope section and the section with a relative...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/24
CPCG01N3/24G01N2203/0025
Inventor 毛昱李萍念腾飞林梅何腾刘文科陈柯柯慕博博
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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