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 materials, etc., can solve the problems of insufficient accuracy and can not reflect the recovery degree of the asphalt mixture's resistance to load action, and is easy to popularize and test. The method is simple and feasible, and the experimental data is accurate and reliable.

Inactive Publication Date: 2015-06-17
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 point of view
Therefore, the accuracy of this evaluation index is insufficient, and this index cannot reflect the recovery degree of asphalt mixture's ability to resist load

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 15°C and 500 microstrain, the fatigue test was first carried out on the AC-13 matrix asphalt mixture, and the fatigue test was stopped immediately when the stiffness modulus decayed to 50% of the initial value, and the intermittent period was introduced 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 corresponding to the stiffness modulus of the AC-13 matrix asphalt mixture specimen decaying to 50% of the initial modulus value before the introduction of the healing time; the arrow indicates the healing time after 2 h (15 °C Bottom), the restored stiffness modulus value of the specimen; the black dotted line indicates the corresponding damage rate when the stiffness modulus of the matrix asphalt mixture specimen decays to 50% of the initial modulus va...

Embodiment 2

[0043] The summary of this example is: comparing the self-healing ability of AC-13 SBS modified asphalt mixture and PA-13 SBS modified asphalt mixture, the optimal asphalt ratio is 5.3% and 4.8% respectively.

[0044](1) According to the "Test Regulations for Asphalt and Mixtures in Highway Engineering" JTG E20-2011, the four-point bending fatigue test procedures for asphalt mixtures were carried out respectively for AC-13 SBS modified asphalt mixtures (specimen code 1) and PA- Four-point bending fatigue test of Type 13 SBS modified asphalt mixture (specimen code 2). The test parameters are: the test temperature is 15°C, the loading frequency is 10 Hz, the loading waveform is partial sine wave, the control strain mode is adopted, and the strain level is 500 microstrain.

[0045] (2) Place specimen 1 and specimen 2 in a temperature-controlled box with a temperature of 15°C and cure for 2 hours. The specimens should be placed horizontally on a hard glass plate or ceramic tile wi...

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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 performance detection of highway asphalt pavement materials, and relates to an evaluation method for fatigue self-healing characteristics of asphalt mixture. Background technique [0002] The self-healing of asphalt mixture can be simply defined as the process of partial or complete healing of cracks in asphalt mixture due to repeated traffic loads. When an asphalt mixture fatigues, its hardness and strength decline. Many researchers have observed that during cyclic loading, asphalt mixtures go through three stages: microcrack initiation, growth, and finally macrocrack formation. Regarding the inner reason of healing behavior, there are currently two theories: physical theory and mechanical performance theory. The former refers to the slowing down of microscopic fatigue damage along with the repair of the chemical structure. It is related to the chemical composition and physicochemical properties of as...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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