Mechanism and Performance of Bituminous Mixture Using 100% Content RAP with Bio-Rejuvenated Additive (BRA)
The low RAP content, hot mixing conditions, and the addition of a high ratio of new bitumen and aggregates result in low economic and environmental benefits for current regeneration technologies. A bio-rejuvenated additive (BRA) that can fully (100%) regenerate the RAP without heating is proposed in...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-01-01
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| Series: | Materials |
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| Online Access: | https://www.mdpi.com/1996-1944/15/3/723 |
| _version_ | 1797486766799716352 |
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| author | Anqi Chen Yazhen Qiu Xiangyu Wang Yuanyuan Li Shaopeng Wu Quantao Liu Fan Wu Jianlin Feng Zhuowei Lin |
| author_facet | Anqi Chen Yazhen Qiu Xiangyu Wang Yuanyuan Li Shaopeng Wu Quantao Liu Fan Wu Jianlin Feng Zhuowei Lin |
| author_sort | Anqi Chen |
| collection | DOAJ |
| description | The low RAP content, hot mixing conditions, and the addition of a high ratio of new bitumen and aggregates result in low economic and environmental benefits for current regeneration technologies. A bio-rejuvenated additive (BRA) that can fully (100%) regenerate the RAP without heating is proposed in this paper. To reveal the mechanisms of BRA-rejuvenated RAP, the effects of BRA on the chemical structure and molecular weight of the RAP were investigated using Fourier-transform infrared spectroscopy and gel permeation chromatography. The mechanical performance and water damage resistance of BRA-rejuvenated RAP were studied. Low contents of new bitumen or epoxy resin were suggested to increase the mechanical performance of 100% RAP. The results show that the 1.5% BRA-rejuvenated RAP had the best mechanical performance. The blending of BRA with recycled RAP is a completely physical process, without any chemical reactions. The molecular weight of BRA is lower than that of bitumen; it can substantially increase the content of light components in aged bitumen, and play the role of adjusting and restoring the balance of the components of aged bitumen. The mechanical performance of BRA-rejuvenated RAP is enhanced significantly by adding low dosages of new bitumen or epoxy resin. |
| first_indexed | 2024-03-09T23:37:57Z |
| format | Article |
| id | doaj.art-6a2bae7aa127449ab782aea3eb96e726 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-09T23:37:57Z |
| publishDate | 2022-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-6a2bae7aa127449ab782aea3eb96e7262023-11-23T16:56:08ZengMDPI AGMaterials1996-19442022-01-0115372310.3390/ma15030723Mechanism and Performance of Bituminous Mixture Using 100% Content RAP with Bio-Rejuvenated Additive (BRA)Anqi Chen0Yazhen Qiu1Xiangyu Wang2Yuanyuan Li3Shaopeng Wu4Quantao Liu5Fan Wu6Jianlin Feng7Zhuowei Lin8Wuhan Institute of Technology, School of Civil Engineering and Architecture, Wuhan 430205, ChinaWuhan Institute of Technology, School of Civil Engineering and Architecture, Wuhan 430205, ChinaWuhan Institute of Technology, School of Civil Engineering and Architecture, Wuhan 430205, ChinaWuhan Institute of Technology, School of Civil Engineering and Architecture, Wuhan 430205, ChinaState Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, ChinaState Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, ChinaWuhan Institute of Technology, School of Civil Engineering and Architecture, Wuhan 430205, ChinaWuhan Institute of Technology, School of Civil Engineering and Architecture, Wuhan 430205, ChinaSchool of Literatures, Languages and Cultures, The University of Edinburgh, Edinburgh EH8 9LH, UKThe low RAP content, hot mixing conditions, and the addition of a high ratio of new bitumen and aggregates result in low economic and environmental benefits for current regeneration technologies. A bio-rejuvenated additive (BRA) that can fully (100%) regenerate the RAP without heating is proposed in this paper. To reveal the mechanisms of BRA-rejuvenated RAP, the effects of BRA on the chemical structure and molecular weight of the RAP were investigated using Fourier-transform infrared spectroscopy and gel permeation chromatography. The mechanical performance and water damage resistance of BRA-rejuvenated RAP were studied. Low contents of new bitumen or epoxy resin were suggested to increase the mechanical performance of 100% RAP. The results show that the 1.5% BRA-rejuvenated RAP had the best mechanical performance. The blending of BRA with recycled RAP is a completely physical process, without any chemical reactions. The molecular weight of BRA is lower than that of bitumen; it can substantially increase the content of light components in aged bitumen, and play the role of adjusting and restoring the balance of the components of aged bitumen. The mechanical performance of BRA-rejuvenated RAP is enhanced significantly by adding low dosages of new bitumen or epoxy resin.https://www.mdpi.com/1996-1944/15/3/723bio-rejuvenated additive100% rejuvenationreclaimed asphalt pavementregeneration mechanismpavement performance |
| spellingShingle | Anqi Chen Yazhen Qiu Xiangyu Wang Yuanyuan Li Shaopeng Wu Quantao Liu Fan Wu Jianlin Feng Zhuowei Lin Mechanism and Performance of Bituminous Mixture Using 100% Content RAP with Bio-Rejuvenated Additive (BRA) Materials bio-rejuvenated additive 100% rejuvenation reclaimed asphalt pavement regeneration mechanism pavement performance |
| title | Mechanism and Performance of Bituminous Mixture Using 100% Content RAP with Bio-Rejuvenated Additive (BRA) |
| title_full | Mechanism and Performance of Bituminous Mixture Using 100% Content RAP with Bio-Rejuvenated Additive (BRA) |
| title_fullStr | Mechanism and Performance of Bituminous Mixture Using 100% Content RAP with Bio-Rejuvenated Additive (BRA) |
| title_full_unstemmed | Mechanism and Performance of Bituminous Mixture Using 100% Content RAP with Bio-Rejuvenated Additive (BRA) |
| title_short | Mechanism and Performance of Bituminous Mixture Using 100% Content RAP with Bio-Rejuvenated Additive (BRA) |
| title_sort | mechanism and performance of bituminous mixture using 100 content rap with bio rejuvenated additive bra |
| topic | bio-rejuvenated additive 100% rejuvenation reclaimed asphalt pavement regeneration mechanism pavement performance |
| url | https://www.mdpi.com/1996-1944/15/3/723 |
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