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借助于四点弯曲小梁疲劳试验装置,采用对称循环加载方式,通过加载次数来设置循环,并且在不同的循环次数之间设定相应的恢复时间,研究了多个循环作用下不同的恢复方式、应变大小以及温度的大小与沥青混合料的劲度残留率之间的关系。研究结果表明:小梁在无约束情况时的劲度残留率要大于有约束时的劲度残留率,并且随着循环次数的增加,这两者之间的差值会越来越小。应变越小,则劲度残留率会越大,200με作用下劲度的残留率较大,400με和600με作用下对应的劲度残留率在循环次数少的时候比较接近,随着循环次数的增加,二者之间的差异会明显。温度为5℃和15℃时的劲度残留率比较接近,25℃时的劲度残留率要大于5℃和15℃时的对应的劲度残留率。
By means of the four-point bending fatigue testing device, the symmetrical cyclic loading method is adopted, the cycle is set by the loading times, and the corresponding recovery time is set between the different cycles, and the different recovery modes under multiple cycles are studied , The size of the strain and the relationship between the temperature and the residual stiffness of asphalt mixture. The results show that the stiffness residual ratio of the trabeculae under unconstrained conditions is greater than that of the restrained stiffness residuals, and the difference between the two will be smaller and smaller as the number of cycles increases. The smaller the strain is, the greater the residual rate of stiffness is. The residual rate of stiffness under 200με is larger. The corresponding residual stiffness under 400με and 600με is close to the number of cycles. As the number of cycles increases , The difference between the two will be obvious. When the temperature is 5 ℃ and 15 ℃, the residual rate of stiffness is relatively close, and the residual rate of stiffness at 25 ℃ is greater than the corresponding residual rate of stiffness at 5 ℃ and 15 ℃.