Aging Characterizations of Modified Asphalt Binders Based on Low Field Nuclear Magnetic Resonance (LF-NMR)
Styrene-butadiene-styrene block copolymer (SBS) and crumb rubber modifier (CRM) are commonly used modifiers to modify asphalt binders. The aging of modified asphalt binders is an important factor affecting their performance. In this paper, the effects of the two modifiers (i.e., SBS, CRM) on the agi...
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MDPI AG
2022-11-01
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| Online Access: | https://www.mdpi.com/1996-1944/15/22/8224 |
| _version_ | 1797464726812229632 |
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| author | Lili Wang Xinsheng Li Junan Shen Jing Li Wei Wang |
| author_facet | Lili Wang Xinsheng Li Junan Shen Jing Li Wei Wang |
| author_sort | Lili Wang |
| collection | DOAJ |
| description | Styrene-butadiene-styrene block copolymer (SBS) and crumb rubber modifier (CRM) are commonly used modifiers to modify asphalt binders. The aging of modified asphalt binders is an important factor affecting their performance. In this paper, the effects of the two modifiers (i.e., SBS, CRM) on the aging of modified asphalt binders were studied by using low field nuclear magnetic resonance (LF-NMR) technology and dynamic shear rheological (DSR) tests. Test results showed that when T2, a parameter of relaxation time from NMR test, was within 2.2 milliseconds, the relaxation peak of both modified and unmodified asphalt binders tested showed two peaks (i.e., “M” shape), and when it was greater than 2 milliseconds, extra peaks appeared only in the modified asphalts. These extra peaks gradually disappeared with increased aging; the modifiers carried signal intensities of their own. The addition of a modifier changes the law of “the greater the viscosity of asphalt, the shorter the T2 relaxation time”. With the aging process, the normalized peak area (NPA) from NMR decreased, and rutting resistance factor from DSR increased. However, the NPA of modified asphalt increased after the PAV test, which may be related to the change of H semaphore. The rheological properties of the asphalt binders before and after aging were well-correlated with the NPA of T2. |
| first_indexed | 2024-03-09T18:12:15Z |
| format | Article |
| id | doaj.art-df84caee646149f296c0a761be848838 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-09T18:12:15Z |
| publishDate | 2022-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-df84caee646149f296c0a761be8488382023-11-24T09:06:12ZengMDPI AGMaterials1996-19442022-11-011522822410.3390/ma15228224Aging Characterizations of Modified Asphalt Binders Based on Low Field Nuclear Magnetic Resonance (LF-NMR)Lili Wang0Xinsheng Li1Junan Shen2Jing Li3Wei Wang4Suzhou Sanchuang Pavement Engineering Co., Ltd., Suzhou 215011, ChinaJiangsu Provincial Center of Ecological Road Technology Industrialization and Research, Suzhou University of Science and Technology, Suzhou 215011, ChinaDepartment of Civil Engineering and Construction, Georgia Southern University, Statesboro, GA 30458, USAJiangsu Provincial Center of Ecological Road Technology Industrialization and Research, Suzhou University of Science and Technology, Suzhou 215011, ChinaSchool of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, ChinaStyrene-butadiene-styrene block copolymer (SBS) and crumb rubber modifier (CRM) are commonly used modifiers to modify asphalt binders. The aging of modified asphalt binders is an important factor affecting their performance. In this paper, the effects of the two modifiers (i.e., SBS, CRM) on the aging of modified asphalt binders were studied by using low field nuclear magnetic resonance (LF-NMR) technology and dynamic shear rheological (DSR) tests. Test results showed that when T2, a parameter of relaxation time from NMR test, was within 2.2 milliseconds, the relaxation peak of both modified and unmodified asphalt binders tested showed two peaks (i.e., “M” shape), and when it was greater than 2 milliseconds, extra peaks appeared only in the modified asphalts. These extra peaks gradually disappeared with increased aging; the modifiers carried signal intensities of their own. The addition of a modifier changes the law of “the greater the viscosity of asphalt, the shorter the T2 relaxation time”. With the aging process, the normalized peak area (NPA) from NMR decreased, and rutting resistance factor from DSR increased. However, the NPA of modified asphalt increased after the PAV test, which may be related to the change of H semaphore. The rheological properties of the asphalt binders before and after aging were well-correlated with the NPA of T2.https://www.mdpi.com/1996-1944/15/22/8224low field nuclear magnetic resonance (LF-NMR)SBSCRMmodified asphaltaging |
| spellingShingle | Lili Wang Xinsheng Li Junan Shen Jing Li Wei Wang Aging Characterizations of Modified Asphalt Binders Based on Low Field Nuclear Magnetic Resonance (LF-NMR) Materials low field nuclear magnetic resonance (LF-NMR) SBS CRM modified asphalt aging |
| title | Aging Characterizations of Modified Asphalt Binders Based on Low Field Nuclear Magnetic Resonance (LF-NMR) |
| title_full | Aging Characterizations of Modified Asphalt Binders Based on Low Field Nuclear Magnetic Resonance (LF-NMR) |
| title_fullStr | Aging Characterizations of Modified Asphalt Binders Based on Low Field Nuclear Magnetic Resonance (LF-NMR) |
| title_full_unstemmed | Aging Characterizations of Modified Asphalt Binders Based on Low Field Nuclear Magnetic Resonance (LF-NMR) |
| title_short | Aging Characterizations of Modified Asphalt Binders Based on Low Field Nuclear Magnetic Resonance (LF-NMR) |
| title_sort | aging characterizations of modified asphalt binders based on low field nuclear magnetic resonance lf nmr |
| topic | low field nuclear magnetic resonance (LF-NMR) SBS CRM modified asphalt aging |
| url | https://www.mdpi.com/1996-1944/15/22/8224 |
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