复合无机水合盐对磷酸镁水泥水化及性能的影响<sup>*</sup>

doi:10.11896/j.issn.1005-023X.2017.023.023

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Abstract According to optimal proportion(1.5∶7∶1.5, mass ratio), composite hydrated salt(FH) was prepared by blending three categories of hydrated salt Na₂B₄O₇·10H₂O, Na₂SO₄·10H₂O and Ca(NO₃)₂·4H₂O. Work performance, hydration temperature and compressive strength of magnesium potassium phosphate cement(MKPC) mixed with borax NB10 and mixed with different content of FH(FH-MKPC) were compared. Combining hydration heat evolution curve, influence of FH on early hydration of MKPC was investigated by XRD, TG-DSC and SEM microcosmic analysis methods. The result showed FH slowed down the hydration of MKPC, which made hydration temperature rise curve have induction and two temperature peak, and diminished hydration heat evolution rate and hydration temperature peak value. The addition of FH(>8%) prolonged setting time of MKPC largely, enhancing construction operability. With the content of FH increase, setting time of MKPC prolonged, fluidity increased and early compressive strength decreased. Initial setting time of FH-MKPC mixed with 8% FH could reach 25.20 min, prolonged 90.76%, compared with NB10. At the same time, amount and thermal stability of hydration products of early hydration stage of FH-MKPC was higher, 7 h, 1 d and 3 d compressive strength were also slightly higher than former. In order to meet the requirement of construction and strength, optimal content of FH was 8%.

Key words： composite hydrated salt magnesium potassium phosphate cement (MKPC) hydration temperature setting time hydration products optimal content

Published: 08 May 2018

CLC number:

TB34

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	Articles by authors
	ZHAO Sixie
	YAN Hua
	WANG Hongtao
	LI Yuntao
	DAI Fengle
	XUE Ming
	HU Zhide

Cite this article:

ZHAO Sixie,YAN Hua,WANG Hongtao, et al. Effect of Composite Hydrated Salt on Hydration and Properties of Magnesium Phosphate Cement[J]. Materials Reports, 2017, 31(23): 156-162.

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http://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2017.023.023 OR http://www.mater-rep.com/EN/Y2017/V31/I23/156

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