基于红外光谱的沥青SBS 含量自动测定方法

为有效检测沥青中SBS( Styrene-Butadiene-Styrene Copolymer) 含量，提出了一种基于红外光谱法测定改性沥青SBS 含量的方法。该方法对比分析SBS 改性剂和基质沥青红外光谱，确定SBS 改性剂特征峰966 成为定量测定沥青SBS 的关键点，引入复化辛普生求积公式求吸收峰峰面积; 依据朗伯-比耳定律，通过最小二乘法拟合出峰面积比与SBS 含量之间关系的标准曲线。最后用辽河石化70#基质沥青制备不同SBS 含量的改性沥青，最终校正样本和测试样本测定的SBS 含量平均误差分别是0． 14%、0． 02%。实验结果表明，该方法相比原有凝胶渗透色谱等试验测定方法具有速度快、精度高、易操做等特点，为今后道路建设工程中及时检测沥青 SBS 含量提供一种科学有效的方法。

Determination of SBS Content in Modified Asphalt Based on Infrared Spectroscopy

In order to effectively detect the SBS ( Styrene-Butadiene-Styrene Copolymer) content in modified asphalt，an improved method based onInfrared spectroscopy is presented． By comparing the SBS modifier’ sspectroscopyandmatrix asphalt's spectroscopy，the characteristic absorbance peak at 966 of SBS modifier is used to detect the SBS content． Compound Simpson formula is introduced to calculate the peak area． Then，according to Lambert-Beer's law，the standard curve of the relationship between peak area ratio and SBS content are obtained by least square method． Finally，modified asphalt with different SBS contents are prepared from 70# matrix asphalt of Liao He Petrochemical Company． The average error of calibration samples and test samples is 0． 14% and 0． 02% respectively． The results show that the proposed method has the advantages of fast speed，high precision and easy operation compared with the original methods such as GPC． It provides a scientific and effective method for timely detection of asphalt SBS content in road construction projects in the future．