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    Volume 47, Issue 1 (January 2019)

    A Comparative Study on Hydraulic Properties and Cementitious Activity of Carbon Steel Slag and Stainless Steel Slag

    (Received 23 June 2017; accepted 4 December 2017)

    Published Online: 2018

    CODEN: JTEVAB

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    Abstract

    This work aims to make a comparative study on high-fineness, basic-oxygen-furnace, carbon steel slag (CS) and electric-arc-furnace stainless steel slag (SS) with high fineness to assess the possibility of using them as hydraulic binders. Test results reveal that CS has higher early hydraulic properties than SS, which has a higher rate of activity at later ages than at early ages (but still lower than that of CS), confirmed by compressive strength and mercury intrusion porosimeter (MIP) test results. Calorimetric analysis showed exothermic reactions in both slags. X-ray diffraction (XRD), thermogravimetry/differential scanning calorimetry (TG/DSC), Fourier transform-infrared spectra (FTIR), and scanning electron microscopy (SEM) results indicated that the hydration products of CS were mainly calcium silicate hydrate (C-S-H), calcium aluminate hydrate (C-A-H), calcium aluminate silicate hydrate (C-A-S-H), aluminum hydroxide (Al(OH)3 [AH3]), and calcium hydroxide (Ca(OH)2 [CH]); however, C-S-H was the only hydration product of SS. The microchemical analysis showed that the average silicon/calcium atom ratios for the hydration products in 90-day hydrated CS and SS pastes were 0.31 and 0.52, respectively. Wavelength-dispersive X-ray spectroscopy (WDS) mapping at 90 days for both slags revealed that silicon and calcium are included in the hydrated matrix surrounding slag particles, with the addition of aluminum in CS.

    Author Information:

    Fathy, Saly
    School of Material Science and Engineering, Southeast University, Nanjing,

    Liping, Guo
    School of Material Science and Engineering, Southeast University, Nanjing,

    Collaborative Innovation Center for Advanced Civil Engineering Materials, Nanjing,

    Jiangsu Key Laboratory of Construction Materials, Nanjing,

    Rui, Ma
    School of Material Science and Engineering, Southeast University, Nanjing,

    Chunping, Gu
    College of Civil Engineering and Architecture, Zhejiang University of Technology, Zhejiang,

    Wei, Sun
    School of Material Science and Engineering, Southeast University, Nanjing,

    Collaborative Innovation Center for Advanced Civil Engineering Materials, Nanjing,

    Jiangsu Key Laboratory of Construction Materials, Nanjing,


    Stock #: JTE20170368

    ISSN:0090-3973

    DOI: 10.1520/JTE20170368

    Author
    Title A Comparative Study on Hydraulic Properties and Cementitious Activity of Carbon Steel Slag and Stainless Steel Slag
    Symposium ,
    Committee A01