早期温湿度条件对柠檬酸改性硫氧镁胶凝材料性能的影响及机理<sup>*</sup>

doi:10.11896/j.issn.1005-023X.2017.020.023

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Abstract In order to determine early temperature and humidity related stability of citric-acid modified magnesium oxysulfate (CMOs) cementitious materials, the effects and influencing mechanism of different early curing temperature and humidity on mechanical properties and water resistance of CMOs were investigated. The results show that the early mechanical property of CMOs materials increases first and then decreases with the increase of the early curing temperature. At about 35 ℃ the maximum value of flexural strength, compressive strength and water resistance coefficient with 46 days immersion reach 10.4 MPa, 68.0 MPa and 0.9 respectively; While the late mechanical property and water resistance of CMOs material decreases with the increase of the early curing temperature. Furthermore, the mechanical properties and water resistance of CMOs materials with steam curing significantly decreases. At the same time, micro-analysis results show that the hydration reaction of CMOs materials can be more complete because of the increase of the early curing temperature so that the early mechanical properties improve significantly. While the later structural stability deceases with the increase of the early curing temperature, which leads to the decrease of its mechanical properties at the later stage.

Key words： magnesium oxysulfate early temperature and humidity mechanical properties water resistance

Published: 25 October 2017 Online: 2018-05-05

CLC number:

TU528.37

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	Articles by authors
	BA Mingfang
	ZHU Jiezhao
	LIU Junzhe

Cite this article:

BA Mingfang,ZHU Jiezhao,LIU Junzhe. Effects and Mechanism of Early Temperature and Humidity on Properties of Modified Magnesium Oxysulfate Cementitious Materials[J]. Materials Reports, 2017, 31(20): 107-113.

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https://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2017.020.023 OR https://www.mater-rep.com/EN/Y2017/V31/I20/107

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