Asphalt mixture self-healing capability evaluating method

An asphalt mixture and evaluation method technology, which is applied in the direction of using a stable bending force to test the strength of the material, can solve the problems such as the failure to reflect the recovery degree of the asphalt mixture's resistance to load action, the lack of accuracy, etc., and the test method is simple and feasible. , easy to popularize, accurate and reliable test data

Inactive Publication Date: 2014-01-01
SOUTHEAST UNIV
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Problems solved by technology

Among them, steric softening and cooling lead to an increase in the stiffness modulus, but the increase in the stiffness modulus has no physical meaning from the damage po

Method used

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  • Asphalt mixture self-healing capability evaluating method
  • Asphalt mixture self-healing capability evaluating method
  • Asphalt mixture self-healing capability evaluating method

Examples

Experimental program
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Effect test

Embodiment 1

[0041] Such as figure 2 , Under the test conditions of 500 microstrain at 15℃, firstly perform fatigue test on AC-13 matrix asphalt mixture, and stop the fatigue test immediately when its stiffness modulus decays to 50% of the initial value, and introduce intermittent period That is healing time. After reaching the set time (2h in this example), the fatigue test starts immediately, that is, the fatigue test after the healing period. The black solid line in the figure indicates the damage rate when the stiffness modulus of the AC-13 matrix asphalt mixture sample decays to 50% of the initial modulus value before the introduction of the healing time; the arrow indicates the healing time after 2h (15℃ Bottom), the recovered stiffness modulus value of the specimen; the black dotted line indicates the damage rate when the stiffness modulus of the matrix asphalt mixture specimen decays to 50% of the initial modulus value after the healing time is introduced. The ratio of the two sl...

Embodiment 2

[0043] The overview of this embodiment is: comparing the self-healing ability of AC-13 SBS modified asphalt mixture and PA-13 SBS modified asphalt mixture, the best oil-stone ratio is 5.3% and 4.8%, respectively.

[0044] (1) In accordance with the four-point bending fatigue test procedure for asphalt mixture in the "Highway Engineering Asphalt and Mixture Test Regulations" JTG E20-2011, the AC-13 SBS modified asphalt mixture (sample code 1) and PA- Four-point bending fatigue test of 13-type SBS modified asphalt mixture (sample code 2). The test parameters are: test temperature is 15℃, loading frequency is 10Hz, loading waveform is partial sine wave, using controlled strain mode, strain level is 500 microstrain.

[0045] (2) Place test piece 1 and test piece 2 in a temperature control box with a temperature of 15℃ for 2 hours. The test piece should be placed horizontally on a hard glass plate or ceramic tile with a flat surface and a certain rigidity to prevent the occurrence of th...

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Abstract

The invention discloses an asphalt mixture self-healing capability evaluating method. An intermission is introduced after a traditional fatigue test step based on an asphalt mixture four-point bending fatigue test, and a testpiece is maintained in certain environment and then undergoes the fatigue test to form a fatigue-healing-fatigue test mode. A healing index function can be established by comparing stiffness modulus change curves of the two-time fatigue test, and a healing index HI is selected as a key index for evaluating the self-healing capability of an asphalt mixture, so the self-healing capabilities of asphalt mixtures of different types can be effectively evaluated, and the influences of factors comprising different self-healing times, self-healing temperature, mixed material damage degrees before self-healing and the like on the asphalt mixture self-healing effect can also be tested. The method has the advantages of simplicity, feasibility, easy operation and accurate and reliable data, and provides a technological index basis for performance based asphalt pavement long-life designing and a full life period asphalt pavement maintenance program making.

Description

Technical field [0001] The invention belongs to the technical field of highway asphalt pavement material performance detection, and relates to a method for evaluating the fatigue self-healing characteristics of asphalt mixtures. Background technique [0002] The self-healing of asphalt mixture can be simply defined as the process of partial or full healing of cracks caused by asphalt mixture due to repeated traffic loads. When the asphalt mixture is fatigued, its hardness and strength will decrease. Many researchers have observed that during the cyclic loading process, the asphalt mixture will experience the three stages of micro-cracks, growth, and finally macro-cracks. Regarding the internal causes of healing behavior, there are currently two theories: physical chemistry theory and mechanical properties theory. The former means that with the repair of the chemical structure, the microscopic fatigue damage is also slowed down. It is related to the chemical composition and phy...

Claims

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Application Information

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IPC IPC(8): G01N3/20
Inventor 杨军王昊鹏王征龚明辉王晓陈先华王建伟陈小兵
Owner SOUTHEAST UNIV
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