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Testing method and testing device for low-temperature cracking resistance performance of asphalt beam

A technology of test device and test method, which is applied in the direction of applying stable tension/pressure to test the strength of materials, etc., can solve the problems of unsuitability for popularization and high construction cost, and can make up for the insufficient evaluation of low temperature performance of asphalt, simple structure, rich low temperature The effect of performance evaluation indicators

Inactive Publication Date: 2014-10-08
CHANGAN UNIV
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Problems solved by technology

However, the SHRP low temperature bending beam rheometer in the United States is very expensive, and it is not suitable for widespread use in my country at present.

Method used

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  • Testing method and testing device for low-temperature cracking resistance performance of asphalt beam
  • Testing method and testing device for low-temperature cracking resistance performance of asphalt beam
  • Testing method and testing device for low-temperature cracking resistance performance of asphalt beam

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Embodiment Construction

[0038] Such as figure 1 and figure 2 The shown test device for the low-temperature cracking resistance of asphalt beams includes a test tank 3 filled with cooling liquid, and a bracket 8 for carrying an asphalt beam test piece 5 is arranged in the test tank 3, and the bracket 8 and the asphalt The beam specimen 5 forms a two-point support, and the top of the test tank 3 is provided with a loading device for applying a constant vertical load to the asphalt beam specimen 5. The loading head 4 that the parts abut against. Specifically, a support 9 is provided on the inner bottom wall of the test tank 3 , and the support 8 is installed on the support 9 .

[0039] The test device lowers the asphalt beam specimen 5 to the test temperature through the cooling liquid, and uses three-point loading to bend the asphalt beam specimen 5 to start the low-temperature cracking performance test of the asphalt beam. The mechanical principle is simple, and the processing of the bracket 8 Sim...

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Abstract

The invention discloses a testing method for the low-temperature cracking resistance performance of an asphalt beam. The testing method comprises the following steps: cooling an asphalt beam test piece to a test temperature; putting the asphalt beam test piece onto a bracket which can provide two-point supporting for the asphalt beam test piece; continuously applying a constant vertical load P to the middle crossing-over part of the middle asphalt beam test piece; recording deflection delta of the middle crossing-over part when the asphalt beam test piece is yielded; calculating the stiffness modulus S of asphalt; calculating the strain rate m of the asphalt; and comprehensively evaluating the low-temperature cracking resistance performance of the asphalt through the stiffness modulus S and strain rate m of the asphalt. The testing method can make up for the defect that the low-temperature cracking resistance performance of the asphalt cannot be sufficiently evaluated according to existing regulations through measuring the key indexes representing the low-temperature cracking resistance performance of the asphalt. The invention further discloses a testing device for the low-temperature cracking resistance performance of the asphalt beam. The testing device comprises a testing tank, wherein the bracket which can provide two-point supporting for the asphalt beam test piece is arranged in the testing tank, and a loading device is arranged above the testing tank. Through the testing device, the key indexes representing the low-temperature cracking resistance performance of the asphalt can be effectively tested.

Description

technical field [0001] The invention belongs to the technical field of asphalt performance tests, and in particular relates to a test method and a test device for the low-temperature cracking resistance of asphalt beams. Background technique [0002] In my country's "Test Regulations for Asphalt and Asphalt Mixtures in Highway Engineering JTGE-20-2011", the evaluation index for asphalt's low-temperature cracking resistance is mainly low-temperature ductility, and the temperature sensitivity index of asphalt in the low-temperature range is not given. The penetration index PI is used to predict the temperature sensitivity of asphalt. However, actual engineering experience shows that the penetration index PI cannot scientifically evaluate the temperature sensitivity of asphalt in the low temperature range. The low-temperature bending beam rheometer developed by the US SHRP program can test the low-temperature performance of asphalt (that is, the low-temperature cracking resista...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/18
Inventor 马骉李宁任君平司伟
Owner CHANGAN UNIV
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