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荷耦合作用下沥青混凝土疲劳寿命
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Fatigue Life of Asphalt Concrete under Moisturetemperature loading Coupling Action
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    摘要:

    对粗、中、细3种不同级配类型的AC25沥青混凝土进行冻融和未冻融条件下劈裂疲劳试验,得到应力疲劳方程和应变疲劳方程,分析了水、温、荷耦合对沥青混凝土疲劳寿命的影响研究结果表明:沥青混凝土疲劳寿命与其劈裂强度呈现明显的相关性,劈裂强度越低,相应疲劳寿命越小;不同级配类型的沥青混凝土疲劳性能优劣顺序依次为粗>细>中;在应变模式下,温度对沥青混凝土疲劳寿命的影响不明显,且可将不同温度下应变疲劳方程采用统一的表达式进行拟合,揭示了沥青混凝土应变疲劳过程与温度无关的规律;对于未冻融的粗级配沥青混凝土,其疲劳寿命随温度提高而明显缩短;经一次冻融循环后,在同一应力比下疲劳寿命降低约10%~35%,而在同一应力水平下疲劳寿命降低约75%~80%.

    Abstract:

    The splitting fatigue tests of three types of AC25 asphalt concretes under freeze-thaw and without frozenthaw condition were carried out. The gradations of aggregate in asphalt concretes were coarse, medium and fine. The stress and strain fatigue equations were obtained with the result of the tests. The effect of water, temperature, load and their coupling action on the fatigue life were studied. The results are as the following: the fatigue life of asphalt concrete is in good relation to its split strength, the lower split strength of the asphalt concrete, the lower fatigue life. According to fatigue life, the gradations of different asphalt concretes from best to worst is as follows: rough, fine and medium. The effect of temperature on the fatigue life of asphalt concrete is not obvious in strain control mode test, and the strain fatigue equations at different temperatures can be given with a single equation, which interprets that the process of strain fatigue for asphalt concrete has nothing with temperature. The fatigue life of unfrozenthaw coarse asphalt concrete reduced in a large scope as the increases of temperature. When subjected to a freezethaw cycle, the fatigue life for different types of asphalt concretes reduce about 10% to 35% in the same stress ratio, while it reduce about 75%~80% in the same stress level.

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梅迎军,李志勇,梁乃兴,曹源文.荷耦合作用下沥青混凝土疲劳寿命[J].湖南大学学报:自然科学版,2011,38(2):13~17

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