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    Microstructure of Alkali-Activated Slag in Ultralow Temperature Environments

    Source: Journal of Materials in Civil Engineering:;2024:;Volume ( 036 ):;issue: 003::page 04023637-1
    Author:
    Leping Liu
    ,
    Yao Hong
    ,
    Yue Xu
    ,
    Yuanyuan Li
    ,
    Yan He
    DOI: 10.1061/JMCEE7.MTENG-16493
    Publisher: ASCE
    Abstract: In this study, the changes in the phase and microstructure of alkali-activated slag (AAS) in ultralow-temperature environments (−170°C) was experimentally studied by means of X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, thermal gravimetric (TG), scanning electron microscopy energy dispersive X-ray spectroscopy (SEM-EDS), Si29 magic-angle spinning nuclear magnetic resonance (MAS NMR), and pore structure. The results show that as the modulus of water glass increased, the mass loss of AAS after the ultralow-temperature freeze–thaw cycles (ULT-FTC) decreased, the freeze–thaw resistance increased. The ULT-FTC caused the internal structure of the AAS samples using different activators to slip and rearrange. Partial calcium-(alumina)-silicate-hydrate gel [C─ (A)─ S─ H] gel was decalcified. The gel structure formed using 2.0 M water glass as the activator was the most stable. The dense structure with a lower Ca/Si ratio enables the AAS to maintain a relatively stable microstructure after undergoing ULT-FTC.
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      Microstructure of Alkali-Activated Slag in Ultralow Temperature Environments

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4297908
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    contributor authorLeping Liu
    contributor authorYao Hong
    contributor authorYue Xu
    contributor authorYuanyuan Li
    contributor authorYan He
    date accessioned2024-04-27T22:56:58Z
    date available2024-04-27T22:56:58Z
    date issued2024/03/01
    identifier other10.1061-JMCEE7.MTENG-16493.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4297908
    description abstractIn this study, the changes in the phase and microstructure of alkali-activated slag (AAS) in ultralow-temperature environments (−170°C) was experimentally studied by means of X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, thermal gravimetric (TG), scanning electron microscopy energy dispersive X-ray spectroscopy (SEM-EDS), Si29 magic-angle spinning nuclear magnetic resonance (MAS NMR), and pore structure. The results show that as the modulus of water glass increased, the mass loss of AAS after the ultralow-temperature freeze–thaw cycles (ULT-FTC) decreased, the freeze–thaw resistance increased. The ULT-FTC caused the internal structure of the AAS samples using different activators to slip and rearrange. Partial calcium-(alumina)-silicate-hydrate gel [C─ (A)─ S─ H] gel was decalcified. The gel structure formed using 2.0 M water glass as the activator was the most stable. The dense structure with a lower Ca/Si ratio enables the AAS to maintain a relatively stable microstructure after undergoing ULT-FTC.
    publisherASCE
    titleMicrostructure of Alkali-Activated Slag in Ultralow Temperature Environments
    typeJournal Article
    journal volume36
    journal issue3
    journal titleJournal of Materials in Civil Engineering
    identifier doi10.1061/JMCEE7.MTENG-16493
    journal fristpage04023637-1
    journal lastpage04023637-11
    page11
    treeJournal of Materials in Civil Engineering:;2024:;Volume ( 036 ):;issue: 003
    contenttypeFulltext
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