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    Volume 49, Issue 6 (March 2021)

    Effects of Prepared Carbon Nanofibers on Properties of Emulsified Asphalt

    (Received 21 September 2020; accepted 8 December 2020)

    Published Online: 17 March 2021

    CODEN: JTEVAB

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    Abstract

    To prepare new carbon nanofiber (CNF) for improving properties of emulsified asphalt, CNF-I were first prepared by chemical vapor deposition method. Then the microstructure morphology, specific surface area, pore size distribution, and crystal structure of prepared CNF-I were characterized and compared with those of commercial CNF-II using a field emission scanning electron microscope, automatic specific surface area and aperture distribution instrument, and X-ray diffractometer, respectively. Also, CNF-I and styrene-butadiene-styrene (SBS) latex were utilized to prepare composite modified emulsified asphalt (CS/MEA) and its evaporated residue (ER) samples. Then basic properties of CS/MEA were tested, the dispersity of CNF-I and SBS modifier particles in ER were observed using a confocal laser scanning microscope, and the thermal properties of ER were discussed by using a differential scanning calorimeter. Test results indicate that prepared CNF-I shows cleaner microscopic surface morphology and lower agglomeration degree. The purity and graphitization degree of CNF-I are higher than those of CNF-II, so that the atomic interlaminar force of CNF-I is stronger and the crystal structure is tighter. These improve the surface activity and bonding performance of CNF-I with asphalt. Therefore, CNF-I is selected as a modifier to reinforce emulsified asphalt. Next, basic properties of CS/MEA meet relevant technical requirements. The addition of CNF-I decreases the penetration but increases the softening point of ER. The ductility is first increased and then decreased and reaches the maximum value at the CNF-I content of 0.05 weight percent (wt%). Further, CNF-I forms a spatial network structure in ER and improves the swelling degree of SBS, which causes the phase structure of ER to become more stable. However, when the CNF-I content is higher than 0.05 wt %, the agglomeration occurs to decrease properties of emulsified asphalt. It is found that prepared CNF-I improves properties of emulsified asphalt at the CNF-I content of 0.05 wt %, which is proposed to develop new CS/MEA.

    Author Information:

    Fan, Suying
    College of Civil Engineering, Nanjing Forestry University, Nanjing, Jiangsu

    Li, Chixuan
    College of Civil Engineering, Nanjing Forestry University, Nanjing, Jiangsu

    Xu, Tao
    College of Civil Engineering, Nanjing Forestry University, Nanjing, Jiangsu


    Stock #: JTE20200589

    ISSN:0090-3973

    DOI: 10.1520/JTE20200589

    Author
    Title Effects of Prepared Carbon Nanofibers on Properties of Emulsified Asphalt
    Symposium ,
    Committee D04