Influence of Organic Emulsion on the Structure and Properties of Geopolymer
Publication: Journal of Materials in Civil Engineering
Volume 35, Issue 2
Abstract
Styrene-acrylic organic emulsion was synthesized, prepared, modified by silane coupling agents, and added to metakaolin-based geopolymer. Combining mechanical properties, x-ray diffraction, Fourier transform infrared spectroscopy, thermogravimetric analysis, and energy-dispersive x-ray spectroscopy/scanning electron microscopy (SEM-EDS), the effect of organic emulsion on the properties of geopolymer was analyzed. Results show that the flexural strength of the organic-inorganic hybrid geopolymer formed after adding the modified emulsion was significantly improved. Adding an appropriate amount of organically modified emulsion can improve the mechanical properties of geopolymer cured for 3 days. When adding 0.5 wt% modified emulsion (A-151), the 28-day flexural strength of the hybrid geopolymer reached its maximum value, which was 25.81% higher than that of pure metakaolin-based geopolymer. After the emulsion was added, the compressive strength of geopolymer samples decreased slightly, which may be related to the increased moisture brought by the emulsion and the viscosity of the emulsion. The increased flexural-to-compressive-strength ratio of samples indicate that the toughness of the geopolymer was improved. It was found using SEM-EDS that the organic phase has good compatibility with the inorganic matrix, and the organic phase participates in the polymerization of geopolymer.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request. This includes all experimental data including data shown in Figs. 3–8.
Acknowledgments
This work was financially supported by the National Natural Science Foundation of China (Nos. 51672236, 51502259, and 51572234).
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Published In
Journal of Materials in Civil Engineering
Volume 35 • Issue 2 • February 2023
Copyright
© 2022 American Society of Civil Engineers.
History
Received: Sep 29, 2021
Accepted: Apr 28, 2022
Published online: Nov 16, 2022
Published in print: Feb 1, 2023
Discussion open until: Apr 16, 2023
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