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Fixture and test method for two-way alternating split test of road material cylinder specimen

A technology for road materials and cylinders, which is used in the analysis of materials, the use of repetitive force/pulse force to test the strength of materials, and measurement devices, etc. Fatigue resistance of pavement materials

Inactive Publication Date: 2012-05-02
广东大象交通科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that the existing split test fixtures and methods cannot reflect the stress characteristics of the actual pavement, the test results cannot reveal the fatigue resistance of the actual pavement material, and it is difficult to predict the service life of the pavement

Method used

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  • Fixture and test method for two-way alternating split test of road material cylinder specimen
  • Fixture and test method for two-way alternating split test of road material cylinder specimen
  • Fixture and test method for two-way alternating split test of road material cylinder specimen

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Both the embodiment 1 and the embodiment 2 use the above-mentioned fixture to carry out the bidirectional alternate splitting fatigue test of the specimen.

[0035] Example 1 Bidirectional Alternate Splitting Fatigue Test of Asphalt Mixture Cylindrical Specimen with a Diameter of 100mm

[0036] (1) The size and material of the main components of the test fixture

[0037] The cylindrical specimen used for the test has a diameter of 100 mm and a height of 40 mm. The dimensions of the main components of the corresponding fixture are shown in Table 1.

[0038]

[0039] The length of each bead is 60mm, so that when the specimen is placed in the middle of the fixture, 10mm is left at both ends of the specimen.

[0040] The guide rod is a cylinder with a diameter of 4mm and a length of 150mm.

[0041] The material of each component of the fixture is alloy high carbon steel with a tensile strength of 600MPa. The friction force of the hinge is less than 0.1N. After c...

Embodiment 2

[0057] Example 2 Two-way Alternate Splitting Fatigue Test of Asphalt Mixture Cylindrical Specimen with a Diameter of 150mm

[0058] (1) The size and material of the main components of the test fixture

[0059] The cylindrical specimen used for the test has a diameter of 150 mm and a height of 60 mm. The dimensions of the main components of the corresponding fixture are shown in Table 2.

[0060]

[0061] The length of each bead is 80mm, so that when the specimen is placed in the middle of the fixture, 10mm is left at both ends of the specimen.

[0062] The guide rod is a cylinder with a diameter of 4mm and a length of 200mm.

[0063] The material of each component of the fixture is alloy high carbon steel with a tensile strength of 800MPa. The friction force of the hinge is less than 0.1N. After calibration, when a tensile force of 10kN is applied on the top plate of the fixture, the pressure transmitted to the side pressure bar on the specimen is 9.99kN.

[0064] ...

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Abstract

The invention provides a fixture and test method for a two-way alternating split test of a road material cylinder specimen. The fixture comprises a front end surface unit and a back end surface unit which have the same structure and are arranged at an interval, and a connecting piece arranged between the front end surface unit and the back end surface unit, wherein both the front end surface unitand the back end surface unit comprise an upper wing plate, a lower wing plate and eight connecting plates, and the connecting piece comprises an upper pressure strip, a lower pressure strip, side pressure strips, a top plate and a bottom plate. After the fixture is fixed, the fixture is connected with a loading device; the cylinder specimen is placed in the fixture, so that an equal distance respectively is reserved at the two ends of the specimen; a compression and tensile load is exerted on the top plate of the fixture in the vertical direction in a circulating way, and the specimen generates tensile and compression deformation, accordingly, the results of the tensile-compression alternating two-way split fatigue test are obtained. The fixture realizes the alternating compression-tensile loading of the specimen in the vertical and horizontal directions, the actual anti-fatigue performance of a road surface material under the loading condition is obtained, and the fixture and the test method can be used for studying the propagation and healing rule of internal material cracks.

Description

technical field [0001] The invention relates to a performance test method of road materials, in particular to a fixture and a test method for a bidirectional alternate splitting test of a cylindrical specimen of road materials. Background technique [0002] The fixture and method used in T0716-2011 "Splitting Test of Asphalt Mixture" in "Test Regulations for Asphalt and Asphalt Mixtures in Highway Engineering" (JTG E20-2011) is a splitting test mode with unidirectional loading. It is to symmetrically apply pressure uniformly distributed along the longitudinal axis in the diameter direction of the cylindrical specimen of asphalt mixture, and measure the splitting strength and deformation of the specimen. The existing splitting fatigue test uses the same fixture as T0716-2011 "Splitting Test of Asphalt Mixture", and applies a cyclic compressive load that varies with time in the vertical direction of the specimen, causing the specimen to split in the horizontal direction Defor...

Claims

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Application Information

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IPC IPC(8): G01N3/04G01N3/32
Inventor 葛折圣张肖宁黄明波胡晓倩张狄
Owner 广东大象交通科技有限公司
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