Effect of hydromagnesite addition on the properties and water resistance of magnesium oxysulfate (MOS) cement

被引：65

作者：

Guan, Yan ^{[1
]}

Hu, Zhiqi ^{[1
]}

Zhang, Zuhua ^{[2
]}

Chang, Jun ^{[3
]}

Bi, Wanli ^{[1
,4
]}

Cheeseman, Chris R. ^{[5
]}

Zhang, Tingting ^{[3
]}

机构：

[1] Univ Sci & Technol Liaoning, Inst Mat & Met, Anshan 114031, Liaoning, Peoples R China

[2] Hunan Univ, Coll Civil Engn, Key Lab Green & Adv Civil Engn Mat & Applicat Tec, Changsha 410082, Hunan, Peoples R China

[3] Dalian Univ Technol, Fac Infrastruct Engn, Dalian 116024, Liaoning, Peoples R China

[4] Res Inst Keda Fengchi Magnesium Bldg Mat, Anshan 114031, Liaoning, Peoples R China

[5] Imperial Coll London, Dept Civil & Environm Engn, London SW7 2AZ, England

来源：

CEMENT AND CONCRETE RESEARCH | 2021年 / 143卷

基金：

中国国家自然科学基金;

关键词：

Magnesium oxysulfate cement; Hydromagnesite; Rietveld method; Water resistance; THERMAL-DECOMPOSITION; PORTLAND-CEMENT; REACTIVE MGO; CO2; CAPTURE; CITRIC-ACID; HYDRATION; MECHANISM; CARBONATION; PHOSPHATES; DYPINGITE;

D O I：

10.1016/j.cemconres.2021.106387

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

Magnesium oxysulfate (MOS) cement exhibits excessive cracking when exposed to water because of the reaction of residual MgO that forms extensive Mg(OH)(2), which significantly limits the application breadth of MOS cement. This study investigates the effects of the addition of hydromagnesite ((MgCO3)(4)center dot Mg(OH)(2)center dot 4H(2)O) on the hydration products of MOS cement and the microstructure and physical properties of MOS paste samples. It was found that the addition of hydromagnesite increased the compressive strength and water resistance of MOS cement. This effect is mainly due to the reaction between hydromagnesite and free MgO present in the cement that forms magnesium carbonate (MgCO3 center dot Mg(OH)(2)center dot 3H(2)O) and acts as an additional binding phase. The use of hydromagnesite as an additive for improving the water resistance of MOS cement leads to a decrease in the residual MgO content and improves the water stability of amorphous materials.

引用

页数：13

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