采用动态剪切流变仪、红外光谱仪、荧光显微镜等设备,进行SBS改性沥青储存稳定性试验方法的对比与分析.试验结果表明:动态剪切流变法、红外图谱法及荧光图谱法等3种方法,均能很好地表征SBS改性沥青的储存稳定性,但动态剪切流变法和红外图谱法的适用性及实用性不足;荧光图谱法快速便捷,适用于工地现场对于SBS改性沥青的储存稳定性监控,但仍需大量工程实际试验数据验证有效性;基于数据统计、荧光图谱法及图像处理技术,将SBS改性沥青的储存稳定性状态划分为稳定、亚稳定及不稳定等3种状态,提出了基于荧光显微相态粒径的SBS改性沥青储存稳定性状态判断方法;当SBS相粒径大于1.9 μm时,SBS改性沥青处于不稳定状态,当SBS相粒径处于1.6~1.9μm时,SBS改性沥青处于亚稳定状态,当SBS相粒径小于1.6 μm时,SBS改性沥青处于稳定状态.
Dynamic shear rheometer,infrared spectrometer,fluorescence microscope and other equipment were used to compare and analyze the storage stability test methods of SBS modified asphalt.The test results show that dynamic shear rheological method,infrared spectrum method and fluorescence spectrum method can well characterize the storage stability of SBS modified asphalt,but the applicability and practicability of dynamic shear rheological method and infrared spectrum method are insufficient.The fluorescence spectrum method is fast and convenient,which is suitable for monitoring the storage stability of SBS modified asphalt on the construction site,but it still needs a large number of actual engineering test data to verify its effectiveness.Based on data statistics,fluorescence spectrum method and image processing technology,the storage stability state of SBS modified asphalt is divided into three states:stable,metastable and unstable,and a judgment method of storage stability state of SBS modified asphalt based on fluorescence microscopic phase particle size is proposed.When the particle size of SBS phase is greater than 1.9 pm,SBS modified asphalt is in an unstable state,and when the particle size of SBS phase is 1.6~1.9 μm,SBS modified asphalt is in a metastable state,when the particle size of SBS phase is less than 1.6 μm,SBS modified asphalt is in a stable state.