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    Rheological Property Evaluation and Microreaction Mechanism of Rubber Asphalt, Desulfurized Rubber Asphalt, and Their Composites

    Source: Journal of Materials in Civil Engineering:;2021:;Volume ( 033 ):;issue: 006::page 04021100-1
    Author:
    Ying Fang
    ,
    Zhengqi Zhang
    ,
    Kaiwen Zhang
    ,
    Zhuolin Li
    DOI: 10.1061/(ASCE)MT.1943-5533.0003688
    Publisher: ASCE
    Abstract: Desulfurized rubber asphalt (DRA) is a good environmentally friendly road construction material, but its high-temperature performance is relatively insufficient compared to ordinary rubber asphalt (RA). Therefore, in order to make full use of its environmental protection features and overcome its shortcomings in high-temperature performance, polyphosphoric acid (PPA) was used to modify DRA to prepare composite modified asphalt (PPA-DRA). First, RA, DRA, and PPA-DRA were prepared in this study, and their high-temperature performance and fatigue properties were compared and analyzed by a temperature scanning test and multistress creep recovery test (MSCR). Then, their low-temperature performance was also compared and analyzed by using a bending beam rheological test (BBR). Finally, the modified mechanism of PPA-DRA was revealed by the FTIR test, thermogravimetric analysis (TGA), and microswelling model. Results show that compared to RA and DRA, PPA-DRA performed better both at high and low temperatures but worse at fatigue resistance, and it can be applied to a wider range of traffic grades. However, PPA-DRA and DRA are more susceptible to aging than RA, and the elastic component in PPA-DRA increases greatly due to aging. According to the strategic highway research program (SHRP) specification, PPA-DRA, DRA, and RA can be graded as PG82-34, PG76-28, and PG76-28, respectively. Also, the FTIR test in conjunction with TGA proves that PPA-DRA exhibits better high-temperature performance than DRA and RA from the microscopic perspective, and its modification process is of chemical modification; the swelling model shows that compared to RA and DRA, PPA-DRA shows the largest number of micelles and the best combination between modifier and asphalt molecules, which promotes the formation of a dense spatial network structure and makes the asphalt structure more stable.
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      Rheological Property Evaluation and Microreaction Mechanism of Rubber Asphalt, Desulfurized Rubber Asphalt, and Their Composites

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4269993
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    contributor authorYing Fang
    contributor authorZhengqi Zhang
    contributor authorKaiwen Zhang
    contributor authorZhuolin Li
    date accessioned2022-01-31T23:35:12Z
    date available2022-01-31T23:35:12Z
    date issued6/1/2021
    identifier other%28ASCE%29MT.1943-5533.0003688.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4269993
    description abstractDesulfurized rubber asphalt (DRA) is a good environmentally friendly road construction material, but its high-temperature performance is relatively insufficient compared to ordinary rubber asphalt (RA). Therefore, in order to make full use of its environmental protection features and overcome its shortcomings in high-temperature performance, polyphosphoric acid (PPA) was used to modify DRA to prepare composite modified asphalt (PPA-DRA). First, RA, DRA, and PPA-DRA were prepared in this study, and their high-temperature performance and fatigue properties were compared and analyzed by a temperature scanning test and multistress creep recovery test (MSCR). Then, their low-temperature performance was also compared and analyzed by using a bending beam rheological test (BBR). Finally, the modified mechanism of PPA-DRA was revealed by the FTIR test, thermogravimetric analysis (TGA), and microswelling model. Results show that compared to RA and DRA, PPA-DRA performed better both at high and low temperatures but worse at fatigue resistance, and it can be applied to a wider range of traffic grades. However, PPA-DRA and DRA are more susceptible to aging than RA, and the elastic component in PPA-DRA increases greatly due to aging. According to the strategic highway research program (SHRP) specification, PPA-DRA, DRA, and RA can be graded as PG82-34, PG76-28, and PG76-28, respectively. Also, the FTIR test in conjunction with TGA proves that PPA-DRA exhibits better high-temperature performance than DRA and RA from the microscopic perspective, and its modification process is of chemical modification; the swelling model shows that compared to RA and DRA, PPA-DRA shows the largest number of micelles and the best combination between modifier and asphalt molecules, which promotes the formation of a dense spatial network structure and makes the asphalt structure more stable.
    publisherASCE
    titleRheological Property Evaluation and Microreaction Mechanism of Rubber Asphalt, Desulfurized Rubber Asphalt, and Their Composites
    typeJournal Paper
    journal volume33
    journal issue6
    journal titleJournal of Materials in Civil Engineering
    identifier doi10.1061/(ASCE)MT.1943-5533.0003688
    journal fristpage04021100-1
    journal lastpage04021100-12
    page12
    treeJournal of Materials in Civil Engineering:;2021:;Volume ( 033 ):;issue: 006
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
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