Mechanical Properties of Fly Ash–Slag Based Alkali-Activated Materials under the Low-Energy Consummation-Sealed Curing Condition
Publication: Journal of Materials in Civil Engineering
Volume 33, Issue 10
Abstract
The effect of curing conditions (sealed and standard) on the mechanical properties of fly ash (FA) and ground-granulated blast-furnace slag (GGBFS)–based alkali-activated materials with NaOH and waterglass alkali activators are investigated in this study. The results show the highest 28-day compressive strength of samples was obtained in the A-3 samples and researched to 59.8 MPa under sealed curing conditions. Using scanning electron microscopy (SEM), it was found that samples with sealed curing condition have higher mechanical properties associating to the denser microstructure and low crack width. Under the sealed curing condition, lower carbonation degree of samples has higher content of to form the Si-O-Na bond resulting in the higher content of amorphous gel and geopolymerization degree based on the experiments results of electron paramagnetic resonance (EPR), Fourier transform infrared (FTIR) spectrometer, X-ray photoelectron spectroscopy (XPS), chemical bond water, and selective dissolution.
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Data Availability Statement
No data, models, or code were generated or used during the study.
Acknowledgments
This study was funded by National Natural Science Foundation of China (Grant No. 52002307).
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Published In
Journal of Materials in Civil Engineering
Volume 33 • Issue 10 • October 2021
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Sep 1, 2020
Accepted: Mar 5, 2021
Published online: Jul 30, 2021
Published in print: Oct 1, 2021
Discussion open until: Dec 30, 2021
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