Towards very high RAP content asphalt mixes: A comprehensive performance-based study of rejuvenated binders
Hot recycling of reclaimed asphalt pavement (RAP) from replacement of deteriorated asphalt pavements is a widespread technique, and able to ensure clear economic and environmental benefits. For this reason, paving industries, agencies and researchers are spending significant efforts in order to maxi...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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KeAi Communications Co., Ltd.
2021-12-01
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| Series: | Journal of Traffic and Transportation Engineering (English ed. Online) |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2095756421000659 |
| _version_ | 1818462209171259392 |
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| author | Marco Pasetto Andrea Baliello Giovanni Giacomello Emiliano Pasquini |
| author_facet | Marco Pasetto Andrea Baliello Giovanni Giacomello Emiliano Pasquini |
| author_sort | Marco Pasetto |
| collection | DOAJ |
| description | Hot recycling of reclaimed asphalt pavement (RAP) from replacement of deteriorated asphalt pavements is a widespread technique, and able to ensure clear economic and environmental benefits. For this reason, paving industries, agencies and researchers are spending significant efforts in order to maximize such advantages by increasing the amount of RAP within new asphalt mixtures. Nevertheless, adequate performance of recycled mixtures must be guaranteed despite the re-use of high amounts of RAP which involves the presence of aged, oxidized and stiffened binder. In this perspective, the present study aimed at evaluating the rheological properties at mid-service and high-service temperatures of bituminous blends composed by 40% of virgin binder and 60% of aged rejuvenated bitumen (simulating the aged hard bitumen coming from the RAP). Such proportion was selected to represent a high recycling rate of RAP (about 60% of the total weight of aggregates, RAP included). A chemical commercial additive at the liquid state was selected as rejuvenator; it was dosed at the optimum content based on empirical and rheological preliminary characterization. The performance of the recycled blend was then compared to that of a virgin reference bitumen. Dynamic shear rheometer tests were carried out to determine the master curves and the failure characteristics (at mid and high service temperatures) of the selected binders. The effect of aging (related to the durability over the material lifetime) was also studied analyzing binders’ responses in unaged, short-term and long-term aged conditions. Overall, experimental findings demonstrated the efficacy of the rejuvenation of recycled binders containing very high amount of aged bitumen. |
| first_indexed | 2024-12-14T23:58:24Z |
| format | Article |
| id | doaj.art-cbaa0652d8f148538cf6adb45c014e16 |
| institution | Directory Open Access Journal |
| issn | 2095-7564 |
| language | English |
| last_indexed | 2024-12-14T23:58:24Z |
| publishDate | 2021-12-01 |
| publisher | KeAi Communications Co., Ltd. |
| record_format | Article |
| series | Journal of Traffic and Transportation Engineering (English ed. Online) |
| spelling | doaj.art-cbaa0652d8f148538cf6adb45c014e162022-12-21T22:43:01ZengKeAi Communications Co., Ltd.Journal of Traffic and Transportation Engineering (English ed. Online)2095-75642021-12-018610221035Towards very high RAP content asphalt mixes: A comprehensive performance-based study of rejuvenated bindersMarco Pasetto0Andrea Baliello1Giovanni Giacomello2Emiliano Pasquini3Department of Civil, Environmental and Architectural Engineering (ICEA), University of Padua, Padua, ItalyDepartment of Civil, Environmental and Architectural Engineering (ICEA), University of Padua, Padua, ItalyDepartment of Civil, Environmental and Architectural Engineering (ICEA), University of Padua, Padua, ItalyCorresponding author. Tel.: +39 049 827 5567; fax: +39 049 827 5220.; Department of Civil, Environmental and Architectural Engineering (ICEA), University of Padua, Padua, ItalyHot recycling of reclaimed asphalt pavement (RAP) from replacement of deteriorated asphalt pavements is a widespread technique, and able to ensure clear economic and environmental benefits. For this reason, paving industries, agencies and researchers are spending significant efforts in order to maximize such advantages by increasing the amount of RAP within new asphalt mixtures. Nevertheless, adequate performance of recycled mixtures must be guaranteed despite the re-use of high amounts of RAP which involves the presence of aged, oxidized and stiffened binder. In this perspective, the present study aimed at evaluating the rheological properties at mid-service and high-service temperatures of bituminous blends composed by 40% of virgin binder and 60% of aged rejuvenated bitumen (simulating the aged hard bitumen coming from the RAP). Such proportion was selected to represent a high recycling rate of RAP (about 60% of the total weight of aggregates, RAP included). A chemical commercial additive at the liquid state was selected as rejuvenator; it was dosed at the optimum content based on empirical and rheological preliminary characterization. The performance of the recycled blend was then compared to that of a virgin reference bitumen. Dynamic shear rheometer tests were carried out to determine the master curves and the failure characteristics (at mid and high service temperatures) of the selected binders. The effect of aging (related to the durability over the material lifetime) was also studied analyzing binders’ responses in unaged, short-term and long-term aged conditions. Overall, experimental findings demonstrated the efficacy of the rejuvenation of recycled binders containing very high amount of aged bitumen.http://www.sciencedirect.com/science/article/pii/S2095756421000659Pavement engineeringHot recyclingReclaimed asphaltRejuvenationDSRRheology |
| spellingShingle | Marco Pasetto Andrea Baliello Giovanni Giacomello Emiliano Pasquini Towards very high RAP content asphalt mixes: A comprehensive performance-based study of rejuvenated binders Journal of Traffic and Transportation Engineering (English ed. Online) Pavement engineering Hot recycling Reclaimed asphalt Rejuvenation DSR Rheology |
| title | Towards very high RAP content asphalt mixes: A comprehensive performance-based study of rejuvenated binders |
| title_full | Towards very high RAP content asphalt mixes: A comprehensive performance-based study of rejuvenated binders |
| title_fullStr | Towards very high RAP content asphalt mixes: A comprehensive performance-based study of rejuvenated binders |
| title_full_unstemmed | Towards very high RAP content asphalt mixes: A comprehensive performance-based study of rejuvenated binders |
| title_short | Towards very high RAP content asphalt mixes: A comprehensive performance-based study of rejuvenated binders |
| title_sort | towards very high rap content asphalt mixes a comprehensive performance based study of rejuvenated binders |
| topic | Pavement engineering Hot recycling Reclaimed asphalt Rejuvenation DSR Rheology |
| url | http://www.sciencedirect.com/science/article/pii/S2095756421000659 |
| work_keys_str_mv | AT marcopasetto towardsveryhighrapcontentasphaltmixesacomprehensiveperformancebasedstudyofrejuvenatedbinders AT andreabaliello towardsveryhighrapcontentasphaltmixesacomprehensiveperformancebasedstudyofrejuvenatedbinders AT giovannigiacomello towardsveryhighrapcontentasphaltmixesacomprehensiveperformancebasedstudyofrejuvenatedbinders AT emilianopasquini towardsveryhighrapcontentasphaltmixesacomprehensiveperformancebasedstudyofrejuvenatedbinders |