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选择AS-16沥青砂的3种不同级配为S0、S1和S2型,3种不同沥青用量为10.53%(Ⅰ型)、11.41%(Ⅱ型)和12.33%(Ⅲ型),不同老化时间为室内紫外光照时间0,97,194,292,388 h和583 h,制作沥青砂试件进行光老化。对老化前后的试件进行单轴压缩蠕变试验确定其蠕变曲线并经拟合得到黏弹性参数,根据该参数得到反映沥青砂黏弹性能的柔量值及黏弹比值(RV),并分析其变化规律。结果表明:不同级配沥青砂黏弹性能不同,在合理级配下受紫外光影响最小;不同沥青用量黏弹性不同,但不会随着沥青用量的增减而增减,而是在最佳沥青用量时黏弹性受紫外光老化影响最小;瞬时弹性柔量的比例在随着老化时间的增加而增大,黏性流动柔量和延迟弹性柔量则随之减小;黏弹比随紫外光老化时间的增加而减小。
Three different grades of AS-16 asphaltic sand were selected as S0, S1 and S2. The three kinds of asphalt used were 10.53% (type I), 11.41% (type Ⅱ) and 12.33% (type Ⅲ), with different aging time For the indoor UV light time 0,97,194,292,388 h and 583 h, the production of tar sand specimens for photo-aging. The uniaxial compressive creep test before and after the aging test specimen to determine its creep curve and obtained by fitting the viscoelastic parameters, according to the parameters obtained viscous elastic properties of asphalt sand viscoelastic value and viscoelastic ratio (RV), and Analyze its changing rules. The results show that the viscoelastic properties of asphalt sand with different gradations are different, and the influence of ultraviolet light is the least under reasonable gradation. The viscoelasticity of different asphalt content is different, but it will not increase or decrease with the increase or decrease of asphalt content, The asphalt viscoelasticity is the least affected by ultraviolet light aging. The proportion of instantaneous elastic compliance increases with the increase of aging time, while the viscous flow compliance and delayed compliance decrease. Light aging time decreases.