Properties and mechanism of composite asphalt modified by nano-CaCO3/SBR(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2017年05期
- Page:
- 15-22
- Research Field:
- 道路工程
- Publishing date:
Info
- Title:
- Properties and mechanism of composite asphalt modified by nano-CaCO3/SBR
- Author(s):
- ZHAO Bao-jun; ZHAO Shi-feng; ZHANG Hong-liang; SU Man-man
- 1. Key Laboratory for Highway Engineering in Special Region of Ministry of Education, Chang’an University, Xi’an 710064, Shaanxi, China; 2. Shaanxi Provincial Communication Construction Group, Xi’an 710075, Shaanxi, China; 3. Changchun Municipal Engineering Design and Research Institute, Changchun 130033, Jilin, China
- Keywords:
- road engineering; nano-CaCO3; SBR; composite modified asphalt; property; modification mechanism
- PACS:
- U411
- DOI:
- -
- Abstract:
- In order to improve properties of asphalt under high and low temperature, retard road distress caused by hot and cold weather, and prolong service life of asphalt pavement, the perspective of nano-particles and polymer composite modifier was considered, and the nano-particles/polymer modification system that could improve properties of asphalt under high and low temperature was studied. In order to wake the agglomeration among nano-particles and improve the compatibility between organic material and inorganic material, nano-CaCO3 was modified with silence coupling agent KH560. Nano-CaCO3/SBR composite modified asphalt was prepared by high-speed shear and mixing machine. The softening point, penetration and ductility of nano-CaCO3/SBR composite modified asphalt were measured, and the aging test, dynamic shear rheometer test and beam bending rheometer test were conducted to study the improvement of nano-CaCO3 and SBR on physical property of base asphalt. Scanning electron microscope (SEM), fluorescence microscope and Flourier transform infrared spectroscopy (FTIR) were conducted to study the micromorphology and modification mechanism of composite modified asphalt. The results show that when the amounts of nano-CaCO3 and SBR are 5% and 4% of asphalt by weight, respectively, the softening point of nano-CaCO3/SBR composite modified asphalt increases by 22.3 ℃ compared to SK-70# base asphalt, the penetration decreases by 1.25 mm, and the ductility value increases to above 100 cm. The results of aging test, DSR test and BBR test also show that the properties of nano-CaCO3/SBR composite modified asphalt under high and low temperature are excellent, and this asphalt can be used in the area in which the temperature is very high in summer and very low in winter. Nano-CaCO3 particles can promote the dispersion of SBR in base asphalt and improve the interface binding ability between SBR and base asphalt. Modification process of nano-CaCO3/SBR composite modified asphalt is very complicated, and physical reaction plays a key role between SBR and asphalt. Both physical and chemical reactions occur between nano-particles and asphalt.
Last Update: 2017-10-16