Modification of Magnesium Oxysulfate Cement by Incorporating Weak Acids
Publication: Journal of Materials in Civil Engineering
Volume 30, Issue 9
Abstract
This paper investigates the effects of weak acids (citric acid, boric acid, and trisodium citrate) with dosages of 0.5, 1.5, and 2.5% of MgO weight on compressive strength, water resistance, and drying shrinkage of magnesium oxysulfate (MOS) cement. Hydration products and microstructure of typical samples are studied by using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), differential thermal analysis-thermogravimetry (DTA-TG), and scanning electron microscope (SEM) facilities. The results show that compressive strength of MOS cement increases with an increasing molar ratio and decreasing molar ratio. The addition of citric acid, boric acid, or trisodium citrate significantly enhances compressive strength and water resistance and alleviates drying shrinkage of MOS cement paste. With the incorporation of weak acid, [] phase, which is a new magnesium subsulfate crystalline product with a needlelike crystal whisker shape, forms in cement paste. This substance behaves in a criss-crossing manner and fills in pores and microcracks, inducing the improved performance of MOS cement paste. With optimum dosages of 0.5, 2.5, and 0.5%, respectively, citric acid, trisodium citrate, and boric acid exhibit decreasing improvement effect.
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Acknowledgments
This work was supported by the Practical Technology Research and Development Program of Heilongjiang Province, China (GA16C103) and the Australian Research Council, Australia.
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Published In
Journal of Materials in Civil Engineering
Volume 30 • Issue 9 • September 2018
Copyright
©2018 American Society of Civil Engineers.
History
Received: Jun 7, 2017
Accepted: Mar 13, 2018
Published online: Jun 26, 2018
Published in print: Sep 1, 2018
Discussion open until: Nov 26, 2018
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