Analysis of the chemical properties and high-temperature rheological properties of MDI modified bio-asphalt
- Title
- Analysis of the chemical properties and high-temperature rheological properties of MDI modified bio-asphalt
- Creator
- Shao L.; Wang H.; Zhang R.; Zheng W.; Hossiney N.; Wu C.
- Description
- As an environmentally friendly material, bio-oil is employed to partially replace non-renewable petroleum asphalt, but its addition weakens the high-temperature non-deformability of petroleum asphalt. Therefore, the 4,4?-diphenylmethane diisocyanate (MDI) was employed as a chemical modifier of bio-asphalt to improve its high temperature rheological properties. The MDI with addition of 0.5%, 1%, 2%, 4% by weight, and the bio-oil with addition of 12% were used to obtain the MDI modified bio-asphalts. The chemical reaction mechanism between the MDI and bio-asphalt was analyzed by employing the Fourier-transform infrared spectroscopy (FTIR) and gel permeation chromatography (GPC) tests. Meanwhile, the rotational plate viscosity (RPV) test, the temperature sweep test, and the multiple stress creep and recovery (MSCR) test were employed to evaluate the high-temperature rheological properties of the MDI modified bio-asphalts. Moreover, the relationships between the chemical reaction mechanism and high-temperature rheological parameters of MDI modified bio-asphalt were established. Test results show that a nucleophilic addition reaction occurred between the MDI and the active hydrogen of bio-asphalt to form urethane chains, which increased the content of macromolecular polymers in the bio-asphalt. The MDI increased the G*/sin? (rutting factor) and the E(?) (visco-flow activation energy) of the bio-asphalt, but decreased its permanent strain and Jnr (non-recoverable creep compliance). Therefore, the MDI modifier effectively enhanced the permanent non-deformability of the bio-asphalt. Both IUrethane and LMS were positively correlated with the rutting factor, viscosity and 1/Jnr, and had significant correlations at a significance level of 0.05. Furthermore, the optimal ratio of MDI to bio-oil was determined to be 1:6 by mass. 2020 Elsevier Ltd
- Source
- Construction and Building Materials, Vol-267
- Date
- 2021-01-01
- Publisher
- Elsevier Ltd
- Subject
- Bio-asphalt; Chemical characteristics; MDI; MDI modified bio-asphalt; Rheological properties
- Coverage
- Shao L., Key Laboratory of Transport Industry of Road Structure and Materials (Xi'an), Chang'an University, South Erhuan Middle Section, Xi'an City, 710064, Shaanxi Province, China; Wang H., Key Laboratory of Transport Industry of Road Structure and Materials (Xi'an), Chang'an University, South Erhuan Middle Section, Xi'an City, 710064, Shaanxi Province, China; Zhang R., School of Civil and Transportation Engineering, Beijing University of Civil Engineering and Architecture, Beijing, 100044, China; Zheng W., Key Laboratory of Transport Industry of Road Structure and Materials (Xi'an), Chang'an University, South Erhuan Middle Section, Xi'an City, 710064, Shaanxi Province, China; Hossiney N., Faculty of Engineering, CHRIST (Deemed to be University), Bangalore, 560074, India; Wu C., Jiangsu Transportation Institute (JSTI) Group, Jiangsu, 210017, China
- Rights
- Restricted Access
- Relation
- ISSN: 9500618; CODEN: CBUME
- Format
- Online
- Language
- English
- Type
- Article
Collection
Citation
Shao L.; Wang H.; Zhang R.; Zheng W.; Hossiney N.; Wu C., “Analysis of the chemical properties and high-temperature rheological properties of MDI modified bio-asphalt,” CHRIST (Deemed To Be University) Institutional Repository, accessed April 21, 2025, https://archives.christuniversity.in/items/show/15912.