Impact of Sodium Gluconate Admixture on the Properties of Magnesium Oxysulfate Cement
Publication: Journal of Materials in Civil Engineering
Volume 36, Issue 6
Abstract
Magnesium oxysulfate (MOS) cement, a building material, can be considered the result of the hydration reaction between magnesium sulfate, caustic-burned magnesia powder, and water. Despite its desirable properties, such as limited mechanical strength and water resistance, MOS cement can hinder its use in engineering applications. We employed several testing methods to assess the impact of sodium gluconate (SG) addition on the compressive strength, microstructure, moisture resistance, coagulation time, pH profile, micropore parameters, phase composition, and thermal decomposition of MOS cement’s hydration products. The addition of sodium gluconate improves the stability of the hydration film surrounding active magnesium oxide in magnesium sulfate. This extension in the setting time of MOS cement is observed. Additionally, it inhibits the creation of magnesium hydroxide while facilitating the formation of numerous needlelike structures corresponding to the (5·1·7 phase). Consequently, the mechanical strength and water resistance of MOS cement are substantially improved compared to the unmodified sample.
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Data Availability Statement
All date, models, and code generated or used appear in the published article.
Acknowledgments
We are grateful to the Science and Technology Project of Hebei Education Department (QN 2021223).
Author contributions: Ying Zhao: Conceptualization, Methodology, Writing–Reviewing and Editing, Supervision. Qingyu Che: Software, Writing–Original draft preparation, Formal analysis. Jiyuan Shan: Data curation, Visualization, Investigation. Yuanyuan Zhao: Resources, Writing–Reviewing and Editing. Yongqi Hu: Project administration.
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Published In
Journal of Materials in Civil Engineering
Volume 36 • Issue 6 • June 2024
Copyright
© 2024 American Society of Civil Engineers.
History
Received: May 2, 2023
Accepted: Nov 6, 2023
Published online: Mar 22, 2024
Published in print: Jun 1, 2024
Discussion open until: Aug 22, 2024
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