Effect of Disodium Hydrogen Phosphate on Hydration and Hardening of Magnesium Potassium Phosphate Cement
Publication: Journal of Materials in Civil Engineering
Volume 23, Issue 10
Abstract
Magnesium potassium phosphate cement (MKPC) is usually produced by using dead burned MgO and potassium dihydrogen phosphate. A new MKPC was prepared by using combination of potassium dihydrogen phosphate () and disodium hydrogen phosphate () in certain ratios instead of potassium dihydrogen phosphate alone. To investigate the effect of disodium hydrogen phosphate on hydration and hardening of MKPC, pH value, hydration temperature, setting times, and strength development were measured. The results indicated that disodium hydrogen phosphate increased the pH value of MKPC paste, resulted in endothermic reactions, and cooled MKPC paste. Thus, it retarded early hydration, improved the fluidity, and increased setting times of MKPC paste. Although the early compressive strength of hardened MKPC made with a combination of the two phosphates was slightly lower than that of hardened MKPC prepared with single potassium dihydrogen phosphate, its strength development is sustaining and was higher than that of hardened MKPC with single potassium dihydrogen phosphate at 60 days because of better crystallization and more stable hydration products.
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Acknowledgments
The writers highly appreciate the financial support from National Basic Research Program of China (No. UNSPECIFIED2009CB623203); the scientific and research developing item from the Ministry of Construction of China (UNSPECIFIED2010-K4-38); and the scientific and research project from the Yancheng Institute of Technology (UNSPECIFIEDXKY2009042).
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Published In
Journal of Materials in Civil Engineering
Volume 23 • Issue 10 • October 2011
Pages: 1405 - 1411
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Jun 24, 2010
Accepted: Mar 2, 2011
Published online: Mar 4, 2011
Published in print: Oct 1, 2011
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