Effect of Sodium Hydroxide and Magnesium Chloride on Magnesium Silicate Cement–Based Glass Waste
Publication: Journal of Materials in Civil Engineering
Volume 35, Issue 8
Abstract
The individual effect of sodium hydroxide (NaOH) and magnesium chloride () on the performance of magnesia-based cement is the main focus of this study. Different magnesium oxide–glass waste (MgO–GW) mixtures of molar ratios () of 1, 2, and 3 were prepared and characterized. The results revealed that the mixture having showed the best performance at all curing ages. The addition of 3% by weight NaOH significantly enhanced the mechanical properties of the MgO–GW mixture at . Further addition of NaOH (5% and 7% by weight) caused a notable reduction in the compressive strength values, suggesting the negative effect of high NaOH content on the binding capacity of the produced binder. Increasing the content up to 5% by weight improved the performance of the fabricated cement; meanwhile, the addition of 7% by weight showed the lowest effect. Furthermore, pH is regarded as the key point that affects the performance of magnesia-based cement materials. Two hydration mechanisms were identified, depending on the type of chemical admixture. NaOH increased the pH of the cementitious system, accompanied by speeding up the formation rate of magnesium silicate hydrate (M-S-H) through the improvement of the dissolution of the silicate network within the GW material. Another mechanism was detected in the composite, in which an extra magnesium oxychloride phase (Phase 5: ) was formed besides M–S–H, yielding hardened samples with the highest mechanical properties. Hence, the results herein show that desirable NaOH and contents enhance the feasibility of utilizing GW to produce a high-performance, eco-friendly binder.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
The authors would like to thank all members of the Raw Building Materials and Processing Technology Research Institute, Housing and Building National Research Center.
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Published In
Journal of Materials in Civil Engineering
Volume 35 • Issue 8 • August 2023
Copyright
© 2023 American Society of Civil Engineers.
History
Received: Mar 3, 2022
Accepted: Dec 13, 2022
Published online: May 23, 2023
Published in print: Aug 1, 2023
Discussion open until: Oct 23, 2023
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