Effect of Fly Ash on Rheological Properties of Magnesium Oxychloride Cement
Publication: Journal of Materials in Civil Engineering
Volume 31, Issue 3
Abstract
This paper studies the effect of fly ash on rheological properties of magnesium oxychloride cement (MOC) paste. Six different dosages of fly ash (0%, 15%, 20%, 25%, 30%, and 35% by weight of MgO) samples are prepared to investigate the rheological properties of fly ash–magnesium oxychloride cement (FA-MOC) paste. The effects of fly ash on fluidity, setting times and mechanical properties of MOC paste are measured. Phases and microstructures of FA-MOC paste are analyzed by X-ray diffraction (XRD) and scanning electronic microscopy (SEM). An optical microscope is used to evaluate the flocculation of fresh FA-MOC paste. The results reveal that fly ash can improve fluidity and retard the setting time of MOC paste. The water-absorbing ability and the morphology effect of fly ash have combined effects on the rheological properties of FA-MOC paste. At the same time, the results show that fly ash used in MOC paste does not change the phases composition of hardened paste, but increases the amount of (Phase 5). However, fly ash weakens the structure of hydration products and results in poor mechanical properties of MOC paste.
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Acknowledgments
The authors acknowledge the support from the Fundamental Research Funds for the National Key R&D Program of China (2017YFB0309903), the Qinghai Provincial Natural Science Foundation (2017-ZJ-764 and 2017-ZJ-763), and the Special Fund for Scientific Research of Central Colleges, Chang’an University (Nos. 310831172201 and 300102318501).
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Published In
Journal of Materials in Civil Engineering
Volume 31 • Issue 3 • March 2019
Copyright
©2018 American Society of Civil Engineers.
History
Received: Mar 30, 2018
Accepted: Aug 7, 2018
Published online: Dec 31, 2018
Published in print: Mar 1, 2019
Discussion open until: May 31, 2019
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