Rapid detection of SBS content in modified asphalt based on infrared spectrum analysis(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2019年03期
- Page:
- 10-18
- Research Field:
- 道路工程
- Publishing date:
Info
- Title:
- Rapid detection of SBS content in modified asphalt based on infrared spectrum analysis
- Author(s):
- LUO Sang; LI Xiang; TIAN JIAhao; YIN Jun
- （1. Intelligent Transportation System Research Center, Southeast University, Nanjing 210096, Jiangsu, China; 2. School of Transportation, Southeast University, Nanjing 210096, Jiangsu, China）
- Keywords:
- road engineering; SBS modifier content; infrared spectrum; tabletting method; rapid detection
- PACS:
- -
- DOI:
- -
- Abstract:
- In order to study the rapid detection method of styrenebutadienestyrene (SBS) modifier content in modified asphalt, infrared spectrograms of SBS modified asphalt with different modifier contents were obtained based on infrared spectrum analysis, using a Bruker Alpha infrared spectrometer. The peak areas and peak heights at 966, 1 456, 1 602, 2 852, 2 921 cm-1 were measured by OPUS software, and a regression model of the above characteristic parameters and SBS modifier content was also established, and the accuracy of the regression model was verified. In order to eliminate the influence of potassium bromide tablet thickness, two characteristic absorption peaks of matrix asphalt, i.e., 813 and 1 377 cm-1, were selected using the absorbance ratio (the ratio of the characteristic absorption peak parameters of the SBS modifier to the sum of the characteristic absorption peak parameters of matrix bitumen and SBS modifier) as regression variables. The results show that the characteristic peak of 966 cm-1 is the specific flexural vibration peak of the SBS modifier, and has a highly linear correlation with SBS content. For both 1 377 or 813 cm-1, the regression precision of the peak area is higher than that of the peak height. The characteristic absorption peak of 813 cm-1 as the matrix bitumen is better than that of the 1 377 cm-1 characteristic peak. Therefore, the ratio of the peak area of 966 cm-1 to the sum of peak area between 813 and 966 cm-1 is chosen as a regression parameter. The regression accuracy between the peak area and SBS modifier content is up to 0.992 5, and the error of the test results is approximately 0.1%. The applicability of this detection method is also verified by changing the types of SBSmodified asphalt, modifier, and stabilizer. The resulting relative error can also be controlled below 5%. The research results can provide a reference for the rapid and accurate determination of SBS content in SBSmodified asphalt in actual engineering practice. 12 tabs, 12 figs, 24 refs.
Last Update: 2019-05-23