Na2SO4·10H2O对磷酸钾镁水泥水化硬化的影响*

doi:10.11896/j.issn.1005-023X.2017.023.028

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Abstract Too fast setting and hardening rate as well as concentrative hydration heat of magnesium potassium phosphate cements restrict its extensive engineering application seriously. Endothermic energy storage of phase change material offers a new way for solving the problems. Effect of inorganic phase change material Na₂SO₄· 10H₂O(NS) on hydration temperature,work perfor-mances and compressive strength of magnesium potassium phosphate cement(MKPC) were investigated. Moreover, influence mechanism of NS on properties of MKPC were researched with the aids of XRD, FT-IR, SEM analyses and hydration heat release rate. The result showed that solution and phase change process of NS absorbed a multitude of hydration heat and released crystalliferous water, which attenuated solution rate and concentration of Mg²⁺, PO^3-₄ and H⁺ in system of MKPC. So rate of interior hydration of MKPC reaction diminished, causing prolonged setting time, increased fluidity, and mild hydration heat release and temperature rise. In early hydration process, with NS content increase, early strength of MKPC diminish slightly. Under a certain content of NS (≤ 4%), the crystallinity of hydration products increased, and the long-term strength of MKPC increased steadily. 28 d compressive strength of MKPC with 2% NS was higher than that of the reference group.

Key words： Na₂SO₄·10H₂O magnesium potassium phosphate cement phase change decalescence hydrate calefactive hydration products crystallinity

Published: 10 December 2017 Online: 2018-05-08

CLC number:

TB321

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	Articles by authors
	ZHAO Sixie
	YAN Hua
	WANG Hongtao
	LI Yuntao
	ZHANG Hansong
	HU Zhide

Cite this article:

ZHAO Sixie,YAN Hua,WANG Hongtao, et al. Influence of Na₂SO₄·10H₂O on Hydration and Hardening of Magnesium Potassium Phosphate Cement[J]. Materials Reports, 2017, 31(23): 187-192.

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https://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2017.023.028 OR https://www.mater-rep.com/EN/Y2017/V31/I23/187

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