Pore Structure Characteristics and Reaction Mechanism of Fly Ash GeopolymerSource: Journal of Materials in Civil Engineering:;2024:;Volume ( 036 ):;issue: 009::page 04024249-1DOI: 10.1061/JMCEE7.MTENG-17624Publisher: 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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contributor author | Wanli Wang | |
contributor author | Baomin Wang | |
date accessioned | 2024-12-24T10:37:29Z | |
date available | 2024-12-24T10:37:29Z | |
date copyright | 9/1/2024 12:00:00 AM | |
date issued | 2024 | |
identifier other | JMCEE7.MTENG-17624.pdf | |
identifier uri | http://yetl.yabesh.ir/yetl1/handle/yetl/4299262 | |
description 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. | |
publisher | American Society of Civil Engineers | |
title | Pore Structure Characteristics and Reaction Mechanism of Fly Ash Geopolymer | |
type | Journal Article | |
journal volume | 36 | |
journal issue | 9 | |
journal title | Journal of Materials in Civil Engineering | |
identifier doi | 10.1061/JMCEE7.MTENG-17624 | |
journal fristpage | 04024249-1 | |
journal lastpage | 04024249-15 | |
page | 15 | |
tree | Journal of Materials in Civil Engineering:;2024:;Volume ( 036 ):;issue: 009 | |
contenttype | Fulltext |