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    Comparative Study on Performance of Wax-Modified and Typical SMA Mixtures

    Source: Journal of Materials in Civil Engineering:;2013:;Volume ( 025 ):;issue: 003
    Author:
    Ali Mokhtari
    ,
    Fereidoon Moghadas Nejad
    DOI: 10.1061/(ASCE)MT.1943-5533.0000584
    Publisher: American Society of Civil Engineers
    Abstract: Stone-matrix asphalt (SMA) is a type of hot-mix asphalt that can reduce the cost of maintenance and rehabilitation of pavements through decreasing the amount of permanent deformation during its service life. In addition, warm-mix asphalt (WMA) has been recently used to reduce the mixing and compaction temperatures of asphalt concrete and potentially decrease the initial cost of asphalt mixtures, especially in countries for which energy costs are high. The primary purpose of this research is to combine these technologies to produce more efficient asphalt mixtures. To this end, two different additives [cellulose fiber and styrene-butadiene-styrene (SBS)] were used to construct typical SMA mixtures, and a type of WMA additive (wax) was used to prepare warm SMA specimens. Modified binders were subjected to binder properties tests. Mixture performance tests, including the Marshall, indirect tensile strength, moisture susceptibility, dynamic creep, and resilient modulus tests were also performed to evaluate the performance properties of different types of SMA mixtures. A mechanistic-empirical design procedure was conducted to investigate the benefit of modification. The results indicate that Fischer-Tropsch (FT) wax is capable of enhancing the base binder properties. Although different percents of wax could reduce the amount of binder drain down, this reduction was not adequate. Consequently, the use of an additional additive may be necessary. The effect of wax on the performance properties of SMA mixtures was also insignificant, although there were some improvements. Moreover, by comparing the test results, good correlations were obtained between various performance properties of SMA mixtures, all of which were significant. The use of cellulose fiber, SBS, and FT wax would respectively increase the service life of the pavement 1.08, 1.243, and 1.154 times more than the corresponding unmodified mixtures.
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      Comparative Study on Performance of Wax-Modified and Typical SMA Mixtures

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    contributor authorAli Mokhtari
    contributor authorFereidoon Moghadas Nejad
    date accessioned2017-05-08T21:56:05Z
    date available2017-05-08T21:56:05Z
    date copyrightMarch 2013
    date issued2013
    identifier other%28asce%29mt%2E1943-5533%2E0000618.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/66970
    description abstractStone-matrix asphalt (SMA) is a type of hot-mix asphalt that can reduce the cost of maintenance and rehabilitation of pavements through decreasing the amount of permanent deformation during its service life. In addition, warm-mix asphalt (WMA) has been recently used to reduce the mixing and compaction temperatures of asphalt concrete and potentially decrease the initial cost of asphalt mixtures, especially in countries for which energy costs are high. The primary purpose of this research is to combine these technologies to produce more efficient asphalt mixtures. To this end, two different additives [cellulose fiber and styrene-butadiene-styrene (SBS)] were used to construct typical SMA mixtures, and a type of WMA additive (wax) was used to prepare warm SMA specimens. Modified binders were subjected to binder properties tests. Mixture performance tests, including the Marshall, indirect tensile strength, moisture susceptibility, dynamic creep, and resilient modulus tests were also performed to evaluate the performance properties of different types of SMA mixtures. A mechanistic-empirical design procedure was conducted to investigate the benefit of modification. The results indicate that Fischer-Tropsch (FT) wax is capable of enhancing the base binder properties. Although different percents of wax could reduce the amount of binder drain down, this reduction was not adequate. Consequently, the use of an additional additive may be necessary. The effect of wax on the performance properties of SMA mixtures was also insignificant, although there were some improvements. Moreover, by comparing the test results, good correlations were obtained between various performance properties of SMA mixtures, all of which were significant. The use of cellulose fiber, SBS, and FT wax would respectively increase the service life of the pavement 1.08, 1.243, and 1.154 times more than the corresponding unmodified mixtures.
    publisherAmerican Society of Civil Engineers
    titleComparative Study on Performance of Wax-Modified and Typical SMA Mixtures
    typeJournal Paper
    journal volume25
    journal issue3
    journal titleJournal of Materials in Civil Engineering
    identifier doi10.1061/(ASCE)MT.1943-5533.0000584
    treeJournal of Materials in Civil Engineering:;2013:;Volume ( 025 ):;issue: 003
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
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