Evaluation of emulsified asphalt demulsification process by UV spectrum method(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2017年06期
- Page:
- 17-23
- Research Field:
- 道路工程
- Publishing date:
Info
- Title:
- Evaluation of emulsified asphalt demulsification process by UV spectrum method
- Author(s):
- KONG Ling-yun; TANG Fan-long; XU Yan; ZHAO Pin-hui; ZHANG Yu-zhen
- 1. College of Chemical Engineering, China University of Petroleum (East China), Qingdao 266580, Shandong, China; 2. National & Local Joint Engineering Laboratory of Transportation and Civil Engineering Materials, Chongqing Jiaotong University, Chongqing 400074, China; 3. Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266555, Shandong, China; 4. Neijiang Transportation Bureau, Neijiang 641000, Sichuan, China
- Keywords:
- road engineering; emulsified asphalt; Lambert-Beer law; UV spectrum; demulsification speed
- PACS:
- U414
- DOI:
- -
- Abstract:
- In order to research and evaluate the demulsification process of emulsified asphalt, modern analysis instruments and chemical measurement algorithm were applied to the field of road materials by omics technology. With UV spectrum and Lambert Beer law as the basic principle, CR22G Ⅱ high-speed centrifuge was adopted to accelerate the demulsification by adding centrifugal field to emulsified asphalt, two parameters, involving UV absorbance and the concentration of emulsifier, were introduced to character the demulsification process of emulsified asphalt. And under different test conditions, the demulsification process of emulsified asphalt and emulsified asphalt after aggregate mixing was verified. The results show that emulsified asphalt demulsification simulation method significantly affects the accuracy of demulsification test results. Untreated emulsified asphalt supernatant is cloudy. The solution containing a large amount of suspension asphalt particles has great influence on the test results, leading to the disorder of the UV spectrum measurement, which can not characterize the emulsification process of emulsified asphalt. And after processing, the supernatant liquid has few slurry asphalt particles, the solution is clear and transparent, and the UV spectra obtains good linear in accordance with the practicality. Emulsified asphalt in high speed centrifugal field can accelerate the demulsification. As time goes on, the concentration of emulsifier in the system continues to rise to a constant value, which is manifested in UV spectrum as the absorbance value continues to rise until it reaches a steady state, that is, reaches the demulsification equilibrium state. For emulsifier with UV absorbance, the use of appropriate emulsified asphalt can accelerate the demulsification conditions to accelerate the demulsification conditions. The concentration of emulsifier in the supernatant is controlled within a certain range by UV spectral light meter. According to the UV spectra and Lambert-Beer law, the whole process of emulsified asphalt demulsification can be accurately described. This method can effectively distinguish different aggregate/demulsification velocity of emulsified asphalt system.
Last Update: 2017-12-18