摘要
高原地区沥青路面易受紫外光影响,沥青胶浆是决定抗老化性能关键因素.利用室内紫外光环境箱开展沥青胶浆老化试验,运用动态剪切流变仪进行不同辐照时间下沥青胶浆温度(频率)扫描试验,结合CAM模型建立老化后沥青胶浆复数剪切模量主曲线,分析辐照时间对其黏弹性参数影响.研究表明:随辐照时间延长,胶浆复数剪切模量逐渐增大,相位角逐渐减小,两者趋于稳定;CAM模型可拟合不同辐照时间下沥青胶浆复数剪切模量数据,相关系数达0.99以上;当频率f逐渐减小时,平衡剪切模量G_(e)^(*)逐渐增大,胶浆抗高温变形性能增强;当频率f逐渐增大时,玻璃态复数剪切模量G_(g)^(*)逐渐减小,低温抗变形性能降低,敏感性参数R_(G)^(*)逐渐降低,紫外光老化提升胶浆频率敏感性.
In plateau area,asphalt pavement is easily affected by ultraviolet radiation in the actual service process,and asphalt mortar is the key factor to determine the anti-aging properties of asphalt mixture.In the laboratory,the self-made ultraviolet aging environment box is used to simulate the UV aging of the asphalt mortar.The evolution law of viscoelastic parameters of asphalt mortar under different ultraviolet irradiation times is studied by using a dynamic shear rheometer(DSR),combined with a temperature scanning test and frequency sweep test.With the help of the CAM model,the complex shear modulus master curve of asphalt mortar after UV aging is established,and the effects of different UV irradiation time on the viscoelastic parameters of asphalt mortar are analyzed.The results show that the complex shear modulus of asphalt mortar gradually increases,the phase angle gradually decreases,and they finally tend to be stable with the extension of UV irradiation time.The CAM model can better fit the complex shear modulus data of asphalt mortar under different UV aging times,and the correlation coefficient is above 0.99;When the frequency f gradually decreases,the equilibrium shear modulus G_(e)^(*) gradually increases,and the high-temperature deformation resistance of asphalt mortar increases.When the frequency f gradually increases,the glassy complex shear modulus G_(g)^(*) gradually decreases,the low-temperature anti-deformation decreases,the sensitivity parameter R_(G)^(*) gradually decreases.Ultraviolet aging increases the frequency sensitivity of asphalt mortar.
作者
李子云
王辉
谢祥兵
王明伟
LI Ziyun;WANG Hui;XIE Xiangbing;WANG Mingwei(Zhengzhou Lutong Construction Group Co.Ltd.,Zhengzhou 450007,China;Zhengzhou University of Aeronautics,Zhengzhou 450046,China)
出处
《河南科学》
2022年第8期1292-1300,共9页
Henan Science
基金
国家自然科学基金(51708514)
河南省科技攻关项目(192102310012)
河南省高等学校重点科研项目(19A560024)
郑州路桥建设投资集团有限公司2022年度研发项目(2022JY-01)。
关键词
紫外光老化
沥青胶浆
流变性能
黏弹性参数
CAM模型
ultraviolet aging
asphalt mortar
rheological properties
viscoelastic component
CAM model
