疏水性纳米白炭黑改性沥青及混合料的粘弹特性  

Viscoelasticity of hydrophobic nano-silica modified asphalt and asphalt mixture

作　　者：王子文 郭学东[2] 郭威 常孟元 戴文亭[2] WANG Zi-wen;GUO Xue-dong;GUO Wei;CHANG Meng-yuan;DAI Wen-ting(Changji Intercity Railway Co.Ltd.,Changchun 130021,China;College of Transportation,Jilin University,Changchun 130022,China)

机构地区：[1]长吉城际铁路有限责任公司,长春130021 [2]吉林大学交通学院,长春130022

出　　处：《吉林大学学报（工学版）》2020年第5期1709-1717,共9页Journal of Jilin University:Engineering and Technology Edition

基　　金：国家自然科学基金项目(51178204).

摘　　要：为研究疏水性纳米白炭黑改性沥青及沥青混合料的粘弹特性,选用硅烷偶联剂表面修饰后得到的疏水性纳米白炭黑作为沥青改性剂,对疏水性纳米白炭黑改性沥青及沥青混合料进行了针入度试验、旋转粘度试验、剪切流变试验和静态蠕变试验,并以针入度指数、旋转粘度、复数剪切模量、弹性剪切模量、粘性剪切模量、相位角、车辙因子、应变差以及Burgers粘弹参数为技术指标进行了粘弹性评价。结果表明:加入疏水性纳米白炭黑,可增强沥青混合料的粘弹性能和高温稳定性能,改善沥青的感温性能以及常温状态下的触变性。通过主曲线分析可知,在低频区疏水性纳米白炭黑的掺入可以提高沥青的相位角,增强沥青的弹性性能。通过分析疏水性纳米白炭黑改性沥青的Burgers模型参数,发现疏水性纳米白炭黑的掺入可提高沥青的粘滞系数。由静态蠕变试验结果分析可知,疏水性纳米白炭黑的掺入,可明显降低相同温度下沥青混合料的应变值。此外,疏水性纳米白炭黑改性剂的掺入可增强沥青混合料的弹性部分,增大沥青混合料的粘性流动变形和粘弹性延迟变形。In order to study the viscoelasticity of the hydrophobic nano-silica modified asphalt and its mixture,the hydrophobic nano-silica obtained by surface modification of silane coupling agent was used to modify the asphalt. Penetration test,rotational viscosity test,shear rheological test and static creep test were carried out on the modified asphalt and modified asphalt mixture. The penetration index,rotational viscosity,complex shear modulus,elastic shear modulus,viscoelastic modulus,phase angle,rutting factor,strain difference and Burgers viscoelastic parameters were evaluated for viscoelasticity. The results show that the incorporation of hydrophobic nano-silica can enhance the viscoelasticity and high-temperature stability of asphalt mixture,and improve the temperature sensing performance of asphalt and the thixotropy under normal temperature. According to the main curve analysis,in the low frequency region,the incorporation of hydrophobic nano-silica can improve the phase angle of the asphalt and enhance the elastic property of the asphalt. By analyzing the Burgers model parameters of hydrophobic nano-silica modified asphalt,it is found that the incorporation of hydrophobic nano-silica can improve the viscosity of asphalt.The results of static creep test show that the incorporation of hydrophobic nano-silica can significantly reduce the strain value of the asphalt mixture at the same temperature. In addition,the incorporation of the hydrophobic nano-silica modifier can enhance the elastic portion of the asphalt mixture,increasing viscous flow deformation and viscoelastic delayed deformation.

关 键 词：表面修饰 疏水性纳米白炭黑 粘弹性 剪切流变试验 BURGERS模型 

分 类 号：U416[交通运输工程—道路与铁道工程]