Full range of mode I and II cracking performance of asphalt mixtures containing low to high reclaimed asphalt pavement (RAP) contents; modified by recycling agent and substituting of a softer binder
Reclaimed asphalt pavement (RAP) is a recycled material that can decrease the consumption of virgin materials; however, it increases stiffness and brittleness, resulting in cracking. In this regard adding recycling agents and using soft binders can be a solution. In this study, base binder (PG 64–22...
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| Format: | Article |
| Language: | English |
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Elsevier
2023-12-01
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| Series: | Case Studies in Construction Materials |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214509523006678 |
| _version_ | 1797454549241298944 |
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| author | Payam Bazoobandi Hamid Reza Karimi Seyed Roohollah Mousavi Farman Karimi M.R.M. Aliha |
| author_facet | Payam Bazoobandi Hamid Reza Karimi Seyed Roohollah Mousavi Farman Karimi M.R.M. Aliha |
| author_sort | Payam Bazoobandi |
| collection | DOAJ |
| description | Reclaimed asphalt pavement (RAP) is a recycled material that can decrease the consumption of virgin materials; however, it increases stiffness and brittleness, resulting in cracking. In this regard adding recycling agents and using soft binders can be a solution. In this study, base binder (PG 64–22) with recycling agent and softer binder (PG 58–22) are used to enhance the fracture behavior of asphalt mixtures containing low to high RAP contents (20%, 40%, and 60%). The fracture test was performed using a semi-circular bending (SCB) specimen under pure mode I, two mixed mode I and II, and pure mode II loading. Also, the effect of air voids content is reviewed. Results show that the addition of RAP in mixtures prepared with PG 64–22 binder and recycling agent increases the fracture toughness from 1.22 to 1.25, 1.27, and 130 MPa√m, and reduces the fracture energy from 3.46 to 3.44, 3.36, and 3.24 KJ/m2 (respectively for of 20%, 40% and 60% substitution). By comparing the effect of binder types, although the fracture toughness of mixtures prepared with PG 58–22 binder was lower than mixtures prepared with PG 64–22 binder and recycling agent (at most 11% lower), but the fracture energy of mixtures prepared with PG 58–22 binder was superior (6–19% higher). Based on the data, regression equations of linear trends were extracted, and the relationship between fracture toughness and fracture energy data was clustered and formalized. |
| first_indexed | 2024-03-09T15:39:42Z |
| format | Article |
| id | doaj.art-36a7aa98fe274bcb85c0ef82b6586d2e |
| institution | Directory Open Access Journal |
| issn | 2214-5095 |
| language | English |
| last_indexed | 2024-03-09T15:39:42Z |
| publishDate | 2023-12-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Case Studies in Construction Materials |
| spelling | doaj.art-36a7aa98fe274bcb85c0ef82b6586d2e2023-11-25T04:49:00ZengElsevierCase Studies in Construction Materials2214-50952023-12-0119e02487Full range of mode I and II cracking performance of asphalt mixtures containing low to high reclaimed asphalt pavement (RAP) contents; modified by recycling agent and substituting of a softer binderPayam Bazoobandi0Hamid Reza Karimi1Seyed Roohollah Mousavi2Farman Karimi3M.R.M. Aliha4School of Civil Engineering, Iran University of Science and Technology (IUST), Narmak, 16846-13114 Tehran, IranSchool of Civil Engineering, Iran University of Science and Technology (IUST), Narmak, 16846-13114 Tehran, Iran; Corresponding author.Department of Civil Engineering, University of Sistan and Baluchestan, Zahedan, IranDepartment of Civil Engineering, University of Sistan and Baluchestan, Zahedan, IranWelding and Joining Research Center, School of Industrial Engineering, Iran University of Science and Technology (IUST), Narmak, 16846-13114 Tehran, IranReclaimed asphalt pavement (RAP) is a recycled material that can decrease the consumption of virgin materials; however, it increases stiffness and brittleness, resulting in cracking. In this regard adding recycling agents and using soft binders can be a solution. In this study, base binder (PG 64–22) with recycling agent and softer binder (PG 58–22) are used to enhance the fracture behavior of asphalt mixtures containing low to high RAP contents (20%, 40%, and 60%). The fracture test was performed using a semi-circular bending (SCB) specimen under pure mode I, two mixed mode I and II, and pure mode II loading. Also, the effect of air voids content is reviewed. Results show that the addition of RAP in mixtures prepared with PG 64–22 binder and recycling agent increases the fracture toughness from 1.22 to 1.25, 1.27, and 130 MPa√m, and reduces the fracture energy from 3.46 to 3.44, 3.36, and 3.24 KJ/m2 (respectively for of 20%, 40% and 60% substitution). By comparing the effect of binder types, although the fracture toughness of mixtures prepared with PG 58–22 binder was lower than mixtures prepared with PG 64–22 binder and recycling agent (at most 11% lower), but the fracture energy of mixtures prepared with PG 58–22 binder was superior (6–19% higher). Based on the data, regression equations of linear trends were extracted, and the relationship between fracture toughness and fracture energy data was clustered and formalized.http://www.sciencedirect.com/science/article/pii/S2214509523006678Cracking resistance, Fracture toughness and energy, Reclaimed asphalt pavement (RAP)Recycling agentSoft binder |
| spellingShingle | Payam Bazoobandi Hamid Reza Karimi Seyed Roohollah Mousavi Farman Karimi M.R.M. Aliha Full range of mode I and II cracking performance of asphalt mixtures containing low to high reclaimed asphalt pavement (RAP) contents; modified by recycling agent and substituting of a softer binder Case Studies in Construction Materials Cracking resistance, Fracture toughness and energy, Reclaimed asphalt pavement (RAP) Recycling agent Soft binder |
| title | Full range of mode I and II cracking performance of asphalt mixtures containing low to high reclaimed asphalt pavement (RAP) contents; modified by recycling agent and substituting of a softer binder |
| title_full | Full range of mode I and II cracking performance of asphalt mixtures containing low to high reclaimed asphalt pavement (RAP) contents; modified by recycling agent and substituting of a softer binder |
| title_fullStr | Full range of mode I and II cracking performance of asphalt mixtures containing low to high reclaimed asphalt pavement (RAP) contents; modified by recycling agent and substituting of a softer binder |
| title_full_unstemmed | Full range of mode I and II cracking performance of asphalt mixtures containing low to high reclaimed asphalt pavement (RAP) contents; modified by recycling agent and substituting of a softer binder |
| title_short | Full range of mode I and II cracking performance of asphalt mixtures containing low to high reclaimed asphalt pavement (RAP) contents; modified by recycling agent and substituting of a softer binder |
| title_sort | full range of mode i and ii cracking performance of asphalt mixtures containing low to high reclaimed asphalt pavement rap contents modified by recycling agent and substituting of a softer binder |
| topic | Cracking resistance, Fracture toughness and energy, Reclaimed asphalt pavement (RAP) Recycling agent Soft binder |
| url | http://www.sciencedirect.com/science/article/pii/S2214509523006678 |
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