Effects of Material Ratio, Fly Ash, and Citric Acid on Magnesium Oxysulfate Cement

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	Effects of Material Ratio, Fly Ash, and Citric Acid on Magnesium Oxysulfate Cement
	Wu, Chengyou 1; Yu, Hongfa 2,3; Dong, Jinmei 1; Zheng, Lina 1
	2014-05-01
发表期刊	ACI MATERIALS JOURNAL
卷号	111 期号:3 页码:291-297
关键词	Citric Acid Compressive Strength Fly Ash Magnesium Oxysulfate Cement Material Ratio
摘要	The effects of material ratio, fly ash, and citric acid on the compressive strength and phase composition of magnesium oxysulfate (MOS) cement have been studied. From these results, when the molar ratio of active MgO/MgSO4 increases from 3 to 5, the compressive strength of magnesium oxysulfate cement increases. When the molar ratio of active MgO/MgSO4 is 3, the main crystal phase contributing to the mechanical strength is 3Mg(OH)(2)center dot MgSO4 center dot 8H(2)O; when the molar ratio increases to 5, the main crystal phase is a new magnesium subsulfate that can be expressed as yMg(OH)(2)center dot MgSO4 center dot zH(2)O (Y phase). The compressive strength of MOS cement by adding fly ash decreases from 56.89 to 33.75 MPa (8.251 to 4.895 ksi) by 39.29% when the dosage of fly ash increases to 40%, because SiO2 in fly ash can form magnesium silicate hydrate gel, which can adsorb onto the surface of the Y phase nucleus and inhibit its growth. In the presence of 0.5% weight citric acid (CA), the compressive strength of MOS cement increases, because CA may facilitate the formation of yMg(OH)(2)center dot MgSO4 center dot zH(2)O (Y phase).
语种	英语
引用统计
文献类型	期刊论文
条目标识符	http://ir.isl.ac.cn/handle/363002/5707
专题	青海盐湖研究所知识仓储中国科学院青海盐湖研究所
作者单位	1.Chinese Acad Sci, Qinghai Inst Salt Lake, Inorgan Mat Div, Xining, Peoples R China 2.Qinghai Univ, Civil Engn Coll, Xining, Peoples R China 3.Nanjing Univ Aeronaut & Astronaut, Nanjing, Jiangsu, Peoples R China
推荐引用方式 GB/T 7714	Wu, Chengyou,Yu, Hongfa,Dong, Jinmei,et al. Effects of Material Ratio, Fly Ash, and Citric Acid on Magnesium Oxysulfate Cement[J]. ACI MATERIALS JOURNAL,2014,111(3):291-297.
APA	Wu, Chengyou,Yu, Hongfa,Dong, Jinmei,&Zheng, Lina.(2014).Effects of Material Ratio, Fly Ash, and Citric Acid on Magnesium Oxysulfate Cement.ACI MATERIALS JOURNAL,111(3),291-297.
MLA	Wu, Chengyou,et al."Effects of Material Ratio, Fly Ash, and Citric Acid on Magnesium Oxysulfate Cement".ACI MATERIALS JOURNAL 111.3(2014):291-297.