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    Effect of Organic Montmorillonite on Rheological Properties of Sasobit Warm-Mix Asphalt and Analysis of Its Ultraviolet Aging Behaviors

    Source: Journal of Materials in Civil Engineering:;2022:;Volume ( 034 ):;issue: 012::page 04022339
    Author:
    Hengbin Liu
    ,
    Zhengqi Zhang
    ,
    Naiqiang Li
    ,
    Hongwei Li
    ,
    Panfeng Wang
    DOI: 10.1061/(ASCE)MT.1943-5533.0004445
    Publisher: ASCE
    Abstract: To optimize the rheological properties of warm-mix asphalt and analyze its ultraviolet (UV) aging behaviors, organic montmorillonite was selected to modify the Sasobit warm-mix asphalt. 3% Sasobit was added into the hot mix asphalt to prepare warm-mix asphalt; and then, three different contents of organic montmorillonite (1%, 2%, and 3%) were added to modify the warm-mix asphalt compositely. Subsequently, the road performance and UV aging behaviors of prepared asphalt were evaluated by some rheological indicators; and then, the modification mechanism was investigated by micro testing methods, including Fourier transform infrared spectroscopy (FTIR) test and Fluorescent microscope (FM) test. Results show that with the introduction of Sasobit, construction workability and high-temperature properties of hot mix asphalt were improved, while its fatigue performance and low-temperature properties were decreased. Fortunately, adding organic montmorillonite into the prepared warm-mix asphalt can significantly optimize its fatigue performance while having little influence on its low-temperature properties. UV aging test results show that DSRFn is the most sensitive indicator to characterize the UV aging behaviors of asphalt. Meanwhile, DSRFn aging indexes of warm-mix asphalt and those with 1%–3% organic montmorillonite were reduced by 28.88%, 46.41%, 48.55%, and 46.15%, respectively, compared with that of hot mix asphalt, indicating that Sasobit warm-mix asphalt has superior aging resistance than hot mix asphalt and that the addition of organic montmorillonite can further improve this ability. Microscope test results confirm that the intercalated structure or exfoliated structure may be formed in the asphalt binders, thereby enhancing the rheological properties. In accordance with the presented results, it is recommended that the optimum content of montmorillonite is 2%, which can promote the prepared asphalt samples to obtain excellent rheological properties.
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      Effect of Organic Montmorillonite on Rheological Properties of Sasobit Warm-Mix Asphalt and Analysis of Its Ultraviolet Aging Behaviors

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    contributor authorHengbin Liu
    contributor authorZhengqi Zhang
    contributor authorNaiqiang Li
    contributor authorHongwei Li
    contributor authorPanfeng Wang
    date accessioned2023-04-07T00:34:19Z
    date available2023-04-07T00:34:19Z
    date issued2022/12/01
    identifier other%28ASCE%29MT.1943-5533.0004445.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4289300
    description abstractTo optimize the rheological properties of warm-mix asphalt and analyze its ultraviolet (UV) aging behaviors, organic montmorillonite was selected to modify the Sasobit warm-mix asphalt. 3% Sasobit was added into the hot mix asphalt to prepare warm-mix asphalt; and then, three different contents of organic montmorillonite (1%, 2%, and 3%) were added to modify the warm-mix asphalt compositely. Subsequently, the road performance and UV aging behaviors of prepared asphalt were evaluated by some rheological indicators; and then, the modification mechanism was investigated by micro testing methods, including Fourier transform infrared spectroscopy (FTIR) test and Fluorescent microscope (FM) test. Results show that with the introduction of Sasobit, construction workability and high-temperature properties of hot mix asphalt were improved, while its fatigue performance and low-temperature properties were decreased. Fortunately, adding organic montmorillonite into the prepared warm-mix asphalt can significantly optimize its fatigue performance while having little influence on its low-temperature properties. UV aging test results show that DSRFn is the most sensitive indicator to characterize the UV aging behaviors of asphalt. Meanwhile, DSRFn aging indexes of warm-mix asphalt and those with 1%–3% organic montmorillonite were reduced by 28.88%, 46.41%, 48.55%, and 46.15%, respectively, compared with that of hot mix asphalt, indicating that Sasobit warm-mix asphalt has superior aging resistance than hot mix asphalt and that the addition of organic montmorillonite can further improve this ability. Microscope test results confirm that the intercalated structure or exfoliated structure may be formed in the asphalt binders, thereby enhancing the rheological properties. In accordance with the presented results, it is recommended that the optimum content of montmorillonite is 2%, which can promote the prepared asphalt samples to obtain excellent rheological properties.
    publisherASCE
    titleEffect of Organic Montmorillonite on Rheological Properties of Sasobit Warm-Mix Asphalt and Analysis of Its Ultraviolet Aging Behaviors
    typeJournal Article
    journal volume34
    journal issue12
    journal titleJournal of Materials in Civil Engineering
    identifier doi10.1061/(ASCE)MT.1943-5533.0004445
    journal fristpage04022339
    journal lastpage04022339_17
    page17
    treeJournal of Materials in Civil Engineering:;2022:;Volume ( 034 ):;issue: 012
    contenttypeFulltext
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