Effects of PU soft segment structure type on properties of PU modified asphalt(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2021年6期
- Page:
- 1-10
- Research Field:
- 道路工程
- Publishing date:
Info
- Title:
- Effects of PU soft segment structure type on properties of PU modified asphalt
- Author(s):
- ZHANG Zengping1; HUANG Ting1; ZHU Youxin2; LYU Wenjiang3; SUN Jia1
- （1. Key Laboratory of Highway Engineering in Special Region of Ministry of Education, Chang’an University,Xi’an 710064, Shaanxi, China； 2. Zhaotong Duxiang Expressway Investment Development Co. Ltd,Zhaotong 657000, Yunnan, China； 3. Shaanxi Province Communication ConstructionGroup Co. Ltd, Xi’an 710075, Shaanxi, China）
- Keywords:
- road engineering; PU modified asphalt; soft segment; modification mechanism; theological property
- PACS:
- -
- DOI:
- -
- Abstract:
- To study the relationship between soft segments of polyurethane (PU) and the properties of PU modified asphalt, and in order to promote the application of polyurethane modified asphalt in practical road engineering, two different types of polyols (poly ethyleneglycoladipate (PEA), polytetrahydrofuran ether glycol (PTMEG)) were used as soft segments，diphenylmethane diisocyanate (MDI) and P(biOchloroaniline) methane (MOCA) were used as hard segment to synthsis PU prepolymer and PU modified asphalt. The penetration, softening point and ductility were used to reflect the improvement effect of different soft segment structure types on the physical properties of PU modified asphalt. Dynamic shear rheological (DSR) test and bending beam rheometer (BBR) test were used to test the theological properties of PU modified asphalt. Meanwhile, Fourier transform infrared spectrometer (FTIR) test and differential scanning calorimetry (DSC) test were used to analyzed different soft segments effect on the modification mechanism of PU modified asphalt. The results show that different soft segments have different effects on the properties of PU modified asphalt. Polyester polyol PEA as soft segment of PU can effectively improve the high temperature performance of PU modified asphalt. Meanwhile, polyether polyol PTMEG as soft segment of PU can improve the low temperature performance of PU modified asphalt. By comparing the FTIR curves of two kinds of PU modified asphalt, it is found that the FTIR curve of polyester PU modified asphalt has a higher (—CO) peak value, while the (C—O—C) peak value of polyether PU modified asphalt is more significant, the difference of functional groups leads to the difference effect of soft segment structure types in improving performance of PUmodified asphalt. In addition, when the low temperature performance of PU modified asphalt is measured by the glass transition temperature Tg, it can be seen that the low temperature performance of the polyether type PU modified asphalt is better than that of the polyester type PU modified asphalt. So, in the practical application of PU modified asphalt, the corresponding polyols can be selected as soft segment structure to prepare PU prepolymers according to the performance requirements. 2 tabs, 11 figs, 28 refs.
Last Update: 2021-12-14