云母粉改性沥青黏度及微观特性分析

Analysis of Viscosity and Micro Characteristics of Mica Powder Modified Asphalt

为了研究云母粉改性沥青黏度及微观特性,选择高速剪切法,制备掺量为0%、3%、5%、7%、9%、11%的云母粉改性沥青。采用布洛克菲尔德黏度计分别测试60℃、90℃、110℃、135℃、160℃时的黏度,分析不同温度、云母粉掺量(质量分数)、剪切速率及配制温度对云母粉改性沥青黏度的影响,并用扫描电子显微镜观测云母粉与沥青之间的微观状态变化以及傅里叶变换红外光谱仪对沥青进行透射光谱分析。实验结果表明:当云母粉掺量为11%时黏度最大,温度敏感性最小;云母粉改性沥青黏度与温度之间具有极高的相关性;在相同条件下,云母粉改性沥青的黏度随着云母粉掺量的增加而增大,且随着处理温度的升高而增大;云母粉与沥青仅仅发生物理共混过程,且云母粉掺量为7%时达到理想的物理共混体系。

In order to study the viscosity and micro characteristics of mica powder modified asphalt,the high-speed shearing method was selected to prepare mica powder modified asphalt with the content of 0%,3%,5%,7%,9%,and 11%.The Brookfield viscometer was used to test the viscosity at 60 ℃,90 ℃,110 ℃,135 ℃,160 ℃,and analyze the modification of mica powder by different temperature,mica powder content(mass fraction),shear rate and preparation temperature.The influence of asphalt viscosity,the microscopic state change between mica powder and asphalt was observed with scanning electron microscope,and the transmission spectrum analysis of asphalt with Fourier transform infrared spectrometer.The experimental results show that when the mica powder content is 11%,the viscosity is the largest and the temperature sensitivity is the smallest.There is a very high correlation between the viscosity of mica powder modified asphalt and temperature.Under the same conditions,the viscosity of mica powder modified asphalt increases with the increase of mica powder content,and it increases with the increase of processing temperature.Only the physical blending process of mica powder and asphalt takes place,and the ideal physical blending system is achieved when the content of mica powder is 7%.