Effect of external additives on determination of SBScontent in modified asphalt by FTIR(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2020年3期
- Page:
- 1-10
- Research Field:
- 道路工程
- Publishing date:
Info
- Title:
- Effect of external additives on determination of SBScontent in modified asphalt by FTIR
- Author(s):
- YANG Jun; TANG Zhiyun; XU Gang; CHEN Xianhua; GONG Xiaojing; LU Guilin
- （School of Transportation, Southeast University, Nanjing 211189, Jiangsu, China）
- Keywords:
- road engineering; SBS modified asphalt; infrared spectra; additives; orthogonal test
- PACS:
- -
- DOI:
- -
- Abstract:
- In order to investigate the effect of additives on the accuracy of polymer content determination by Fourier transform infrared spectroscopy (FTIR), Nicolet iS10 infrared spectrometer was used to obtain the infrared spectra of matrix asphalt, SBS modifier, additives such as rubber oil and sulfur.Then, OMNIC software was used to measure the characteristic peak area of infrared spectra of each material, including the characteristic peak area of SBS at 699 and 966 cm-1 and the matrix asphalt at 1 377 cm-1. A standard curve of the relationship between the characteristic peak area ratios A (respectively labeled A699 and A966) and the SBS content was established. Orthogonal experiments were designed to consider the effects of three levels of SBS content, sulfur content and rubber oil content on the detection of SBS content. Variance analysis of orthogonal test results was carried out by Ftest, and the SBS prediction content was obtained by inverse calculation of the orthogonal test results based on the standard curve. The results show that A value has a good positive correlation with SBS content. Additives had a great influence on the accuracy of SBS content detection, and the influence of three factors on SBS content was different. It could be inferred that the main and secondary factors were SBS content, sulfur content and rubber oil content. Besides the factors of rubber oil content at 966 cm-1, other factors had significant influence on the test results. The addition of sulfur reduced the A value and the addition of rubber oil reduced the increase in A value. Furthermore, the relative error between actual SBS contents and predicted contents which could be obtained by inverse calculation of the orthogonal test results according to the standard curve were generally more than 10%, and the maximum values were even more than 15%. The research suggests that the effect of additives on the FTIR detection of modified asphalt SBS content cannot be ignored. In actual engineering, the influence of additives should be considered when we use the FTIR method to detect SBS content. 8 tabs, 9 figs, 25 refs.
Last Update: 2020-06-03