Effect of RAP gradation subdivision and addition of a rejuvenator on recycled asphalt mixture engineering performance
The utilization of reclaimed asphalt pavement (RAP) is an important way for pavement construction to move toward a low impact and sustainable practice, but there are still many problems in the preparation of recycled asphalt mixtures with a high percentage of RAP. In this study, an RAP gradation sub...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2023-07-01
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| Series: | Case Studies in Construction Materials |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214509523003169 |
| _version_ | 1797798906503888896 |
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| author | Lusheng Wang Aiqin Shen Ge Mou Yinchuan Guo Yang Meiquan |
| author_facet | Lusheng Wang Aiqin Shen Ge Mou Yinchuan Guo Yang Meiquan |
| author_sort | Lusheng Wang |
| collection | DOAJ |
| description | The utilization of reclaimed asphalt pavement (RAP) is an important way for pavement construction to move toward a low impact and sustainable practice, but there are still many problems in the preparation of recycled asphalt mixtures with a high percentage of RAP. In this study, an RAP gradation subdivision method was proposed and used to divide RAP gradation into four types. Based on two kinds of RAP gradations after pretreatment and four kinds of RAP gradations after subdivision, a pretreated recycled asphalt mixture (RAM-PR) and a subdivided recycled asphalt mixture (RAM-SR) with different RAP contents were prepared. By testing Marshall design indices and high-temperature performance, it was found that the coefficients of variation in stability, flow, dynamic stability and rutting depth of RAM-SR containing 60 % RAP were 11.9 %, 68.1 %, 88.3 % and 20.7 % lower than those of RAM-PR, respectively. Combined with the research results of the long-term engineering performance of RAM-SR, the maximum tensile strain of RAM-SR containing 40 % RAP and rejuvenator after long-term aging was 9.6 % higher than that containing 35 % RAP without rejuvenator, and the rejuvenator can also improve the long-term water stability of RAM-SR. In areas with low requirements for low temperature performance, the maximum RAP content of RAM-SR in the group with the rejuvenator can reach 60 %. |
| first_indexed | 2024-03-13T04:11:54Z |
| format | Article |
| id | doaj.art-cd61c682888a4a7f8adaaac20fa97099 |
| institution | Directory Open Access Journal |
| issn | 2214-5095 |
| language | English |
| last_indexed | 2024-03-13T04:11:54Z |
| publishDate | 2023-07-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Case Studies in Construction Materials |
| spelling | doaj.art-cd61c682888a4a7f8adaaac20fa970992023-06-21T06:54:39ZengElsevierCase Studies in Construction Materials2214-50952023-07-0118e02136Effect of RAP gradation subdivision and addition of a rejuvenator on recycled asphalt mixture engineering performanceLusheng Wang0Aiqin Shen1Ge Mou2Yinchuan Guo3Yang Meiquan4Corresponding authors.; Key Laboratory for Special Region Highway Engineering of Ministry of Education, Chang’an University, Xi’an 710064, Shaanxi, ChinaCorresponding authors.; Key Laboratory for Special Region Highway Engineering of Ministry of Education, Chang’an University, Xi’an 710064, Shaanxi, ChinaKey Laboratory for Special Region Highway Engineering of Ministry of Education, Chang’an University, Xi’an 710064, Shaanxi, ChinaKey Laboratory for Special Region Highway Engineering of Ministry of Education, Chang’an University, Xi’an 710064, Shaanxi, ChinaKey Laboratory for Special Region Highway Engineering of Ministry of Education, Chang’an University, Xi’an 710064, Shaanxi, ChinaThe utilization of reclaimed asphalt pavement (RAP) is an important way for pavement construction to move toward a low impact and sustainable practice, but there are still many problems in the preparation of recycled asphalt mixtures with a high percentage of RAP. In this study, an RAP gradation subdivision method was proposed and used to divide RAP gradation into four types. Based on two kinds of RAP gradations after pretreatment and four kinds of RAP gradations after subdivision, a pretreated recycled asphalt mixture (RAM-PR) and a subdivided recycled asphalt mixture (RAM-SR) with different RAP contents were prepared. By testing Marshall design indices and high-temperature performance, it was found that the coefficients of variation in stability, flow, dynamic stability and rutting depth of RAM-SR containing 60 % RAP were 11.9 %, 68.1 %, 88.3 % and 20.7 % lower than those of RAM-PR, respectively. Combined with the research results of the long-term engineering performance of RAM-SR, the maximum tensile strain of RAM-SR containing 40 % RAP and rejuvenator after long-term aging was 9.6 % higher than that containing 35 % RAP without rejuvenator, and the rejuvenator can also improve the long-term water stability of RAM-SR. In areas with low requirements for low temperature performance, the maximum RAP content of RAM-SR in the group with the rejuvenator can reach 60 %.http://www.sciencedirect.com/science/article/pii/S2214509523003169RAP gradation subdivision method (RGSM)RejuvenatorSubdivision recycled asphalt mixture (RAM-SR)Engineering performance |
| spellingShingle | Lusheng Wang Aiqin Shen Ge Mou Yinchuan Guo Yang Meiquan Effect of RAP gradation subdivision and addition of a rejuvenator on recycled asphalt mixture engineering performance Case Studies in Construction Materials RAP gradation subdivision method (RGSM) Rejuvenator Subdivision recycled asphalt mixture (RAM-SR) Engineering performance |
| title | Effect of RAP gradation subdivision and addition of a rejuvenator on recycled asphalt mixture engineering performance |
| title_full | Effect of RAP gradation subdivision and addition of a rejuvenator on recycled asphalt mixture engineering performance |
| title_fullStr | Effect of RAP gradation subdivision and addition of a rejuvenator on recycled asphalt mixture engineering performance |
| title_full_unstemmed | Effect of RAP gradation subdivision and addition of a rejuvenator on recycled asphalt mixture engineering performance |
| title_short | Effect of RAP gradation subdivision and addition of a rejuvenator on recycled asphalt mixture engineering performance |
| title_sort | effect of rap gradation subdivision and addition of a rejuvenator on recycled asphalt mixture engineering performance |
| topic | RAP gradation subdivision method (RGSM) Rejuvenator Subdivision recycled asphalt mixture (RAM-SR) Engineering performance |
| url | http://www.sciencedirect.com/science/article/pii/S2214509523003169 |
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