紫外光老化沥青砂黏弹性的影响因素研究  

Research on Influencing Factors of Viscoelasticity of Ultraviolet Aged Asphalt Sand

作　　者：李惠霞[1] 尹振羽[1] 童申家[2] 

机构地区：[1]河南城建学院交通工程学院,河南平顶山467000 [2]西安建筑科技大学土木工程学院,陕西西安750000

出　　处：《公路交通科技》2015年第4期11-15,共5页Journal of Highway and Transportation Research and Development

基　　金：交通运输部西部交通科技项目(20113187721260)

摘　　要：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。The AS- 16 asphalt sand with gradations of SO, S1 and $2, asphalt contents of 10.53% （type Ⅰ ）, 11.41% （type Ⅱ ） and 12.33% （type Ⅲ ）, aging time as indoor ultraviolet illumination time of 0, 97, 194, 292, 388 and 583 h are chosen to make asphalt sand specimens for ultraviolet aging test. The uniaxial compression creep test on the specimens before and after aging is conducted to determine the creep curves and to obtain the fitted viscoelastic parameters. The compliance and viscoelastic ratio which can reflect the viscoelasticity of the asphalt sand are obtained accordingly, and then its change rule is analyzed. The result shows that （1） the asphalt sand with different gradations has different viscoelasticity, and the least influence of UV aging with reasonable gradation is the least; （2） the viscoelasticity of asphalt sand with different asphalt contents changes, but it will not change with the change of asphalt content, the viscoelasticity affected by ultraviolet aging is minimal with the optimum asphalt content ; （3） the proportion of instantaneous elastic compliance increases with the increasing of aging time, while the viscous flow compliance and the delayed elastic compliance decrease; （4） the viscoelastic ratio decreases with the increasing of ultraviolet aging time.

关 键 词：道路工程 沥青砂 紫外光老化 黏弹性 老化时间 

分 类 号：U414[交通运输工程—道路与铁道工程]