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    Nanomechanical Characterization Effect of Mica and Aging on Asphalt Binder

    Source: Journal of Materials in Civil Engineering:;2014:;Volume ( 026 ):;issue: 009
    Author:
    Rafiqul Tarefder
    ,
    Hasan Faisal
    ,
    Helen Sobien
    DOI: 10.1061/(ASCE)MT.1943-5533.0000962
    Publisher: American Society of Civil Engineers
    Abstract: Asphalt concrete (AC) consists of approximately 95% aggregate, by weight. Of this 95%, about 6% is smaller than 0.075 mm in size (passing the #200 sieve and called filler). The fillers often contain mica, which is a formation of silicate minerals having perfect basal cleavage. Mica has been shown to reduce the strength of AC. This study evaluates the effects of mica on asphalt materials subjected to aging. Mica is combined with asphalt binders to make mastics. Mastics are aged at four different levels and tested by nanoindentation to determine modulus and hardness values. It is shown that mastic with no mica becomes much harder after long-term aging. Aged mastic with no mica is shown to be harder than the aged mastics with low concentrations of mica. Mastic with less than 5% mica in the fillers behaves similarly to binder. However, with a mica content of 7.5%, the modulus decreases after long-term aging. A mastic sample containing 5% mica is shown to have the highest modulus value. Therefore, low-concentration mica reduces hardness but increases modulus value of aged mastic. Therefore, mica can be used to control long-term aging behavior of asphalt concrete.
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      Nanomechanical Characterization Effect of Mica and Aging on Asphalt Binder

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    http://yetl.yabesh.ir/yetl1/handle/yetl/67363
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    contributor authorRafiqul Tarefder
    contributor authorHasan Faisal
    contributor authorHelen Sobien
    date accessioned2017-05-08T21:57:26Z
    date available2017-05-08T21:57:26Z
    date copyrightSeptember 2014
    date issued2014
    identifier other%28asce%29mt%2E1943-5533%2E0001006.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/67363
    description abstractAsphalt concrete (AC) consists of approximately 95% aggregate, by weight. Of this 95%, about 6% is smaller than 0.075 mm in size (passing the #200 sieve and called filler). The fillers often contain mica, which is a formation of silicate minerals having perfect basal cleavage. Mica has been shown to reduce the strength of AC. This study evaluates the effects of mica on asphalt materials subjected to aging. Mica is combined with asphalt binders to make mastics. Mastics are aged at four different levels and tested by nanoindentation to determine modulus and hardness values. It is shown that mastic with no mica becomes much harder after long-term aging. Aged mastic with no mica is shown to be harder than the aged mastics with low concentrations of mica. Mastic with less than 5% mica in the fillers behaves similarly to binder. However, with a mica content of 7.5%, the modulus decreases after long-term aging. A mastic sample containing 5% mica is shown to have the highest modulus value. Therefore, low-concentration mica reduces hardness but increases modulus value of aged mastic. Therefore, mica can be used to control long-term aging behavior of asphalt concrete.
    publisherAmerican Society of Civil Engineers
    titleNanomechanical Characterization Effect of Mica and Aging on Asphalt Binder
    typeJournal Paper
    journal volume26
    journal issue9
    journal titleJournal of Materials in Civil Engineering
    identifier doi10.1061/(ASCE)MT.1943-5533.0000962
    treeJournal of Materials in Civil Engineering:;2014:;Volume ( 026 ):;issue: 009
    contenttypeFulltext
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