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    Pore Structure Characteristics and Reaction Mechanism of Fly Ash Geopolymer

    Source: Journal of Materials in Civil Engineering:;2024:;Volume ( 036 ):;issue: 009::page 04024249-1
    Author:
    Wanli Wang
    ,
    Baomin Wang
    DOI: 10.1061/JMCEE7.MTENG-17624
    Publisher: American Society of Civil Engineers
    Abstract: The hydration reaction mechanism of geopolymers is intimately linked to their composition and structure. Additionally, pore structure characteristics play a vital role in the properties of hardened geopolymer pastes, significantly influencing the material’s strength, impermeability, and thermal conductivity. In this study, fly ash geopolymer (FAG) was synthesized by utilizing NaOH, Na2SiO3, and low-calcium fly ash. The pore structure characteristics of FAGs were analyzed using mercury intrusion porosimetry (MIP), and the fractal dimension of FAGs was calculated using the Menger sponge model (Df) and a fractal model based on thermodynamic relationships (Ds). Fourier infrared spectroscopy (FTIR), thermogravimetric differential thermal (TG/DTA), and scanning electron microscopy secondary electron phase (SEM-SE) were used to test the composition of the hydration products of FAGs and their microscopic morphology. The results showed that after 90 days of maintaining ambient temperature, the porosity of FAG is between 20% and 30%, and the most available pore size is 10–50 nm. The fractal dimension calculated using the analytical model based on thermodynamic relations can more comprehensively determine the pore structure characteristics of FAG. The geopolymerization reaction process of fly ash particles can be categorized into four primary processes, forming an amorphous aluminosilicate gel as the hydration product.
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      Pore Structure Characteristics and Reaction Mechanism of Fly Ash Geopolymer

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4299262
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    contributor authorWanli Wang
    contributor authorBaomin Wang
    date accessioned2024-12-24T10:37:29Z
    date available2024-12-24T10:37:29Z
    date copyright9/1/2024 12:00:00 AM
    date issued2024
    identifier otherJMCEE7.MTENG-17624.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4299262
    description abstractThe hydration reaction mechanism of geopolymers is intimately linked to their composition and structure. Additionally, pore structure characteristics play a vital role in the properties of hardened geopolymer pastes, significantly influencing the material’s strength, impermeability, and thermal conductivity. In this study, fly ash geopolymer (FAG) was synthesized by utilizing NaOH, Na2SiO3, and low-calcium fly ash. The pore structure characteristics of FAGs were analyzed using mercury intrusion porosimetry (MIP), and the fractal dimension of FAGs was calculated using the Menger sponge model (Df) and a fractal model based on thermodynamic relationships (Ds). Fourier infrared spectroscopy (FTIR), thermogravimetric differential thermal (TG/DTA), and scanning electron microscopy secondary electron phase (SEM-SE) were used to test the composition of the hydration products of FAGs and their microscopic morphology. The results showed that after 90 days of maintaining ambient temperature, the porosity of FAG is between 20% and 30%, and the most available pore size is 10–50 nm. The fractal dimension calculated using the analytical model based on thermodynamic relations can more comprehensively determine the pore structure characteristics of FAG. The geopolymerization reaction process of fly ash particles can be categorized into four primary processes, forming an amorphous aluminosilicate gel as the hydration product.
    publisherAmerican Society of Civil Engineers
    titlePore Structure Characteristics and Reaction Mechanism of Fly Ash Geopolymer
    typeJournal Article
    journal volume36
    journal issue9
    journal titleJournal of Materials in Civil Engineering
    identifier doi10.1061/JMCEE7.MTENG-17624
    journal fristpage04024249-1
    journal lastpage04024249-15
    page15
    treeJournal of Materials in Civil Engineering:;2024:;Volume ( 036 ):;issue: 009
    contenttypeFulltext
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