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为评价高温和重载对沥青混合料变形特性的影响,对AC-20级配的沥青混合料进行三轴重复荷载蠕变试验研究。结果表明:沥青混合料的变形随温度或应力水平的增大而迅速增大,且高温和重载同时作用会相互促进变形的发展;指标流变次数FN和斜率b均可以较好地反映沥青混合料的高温性能,但是对于高温重载同时作用情况,斜率b或许更合适;指标截距a和永久应变pε不适于评价沥青混合料的高温性能。
In order to evaluate the influence of high temperature and heavy load on the deformation characteristics of asphalt mixture, three-axis repeated loading creep test on asphalt mixture with AC-20 grade was carried out. The results show that the deformation of asphalt mixture rapidly increases with the increase of temperature or stress level, and the simultaneous action of high temperature and heavy load will promote the development of deformation. The index rheological times FN and slope b can all reflect the asphalt The high temperature performance of the mixture, but for high temperature and heavy load simultaneously, the slope b may be more appropriate; index intercept a and permanent strain pε is not suitable for evaluating the high temperature performance of asphalt mixture.