Potential application of highland barley straw ash as a new active admixture in magnesium oxychloride cement

doi:10.1016/j.jobe.2022.105108

CORC > 兰州理工大学 > 兰州理工大学 > 土木工程学院

	Potential application of highland barley straw ash as a new active admixture in magnesium oxychloride cement
	Cao, Feng 2,3; Qiao, Hongxia 1,2,3; Shu, Xiuyuan 3; Cui, Lijun 3; Li, Shuangying 2; Zhang, Tao 2
刊名	JOURNAL OF BUILDING ENGINEERING
	2022-11-01
卷号	59
关键词	Highland barley straw ash Magnesium oxychloride cement Water resistance Hydration process Microstructure
DOI	10.1016/j.jobe.2022.105108
英文摘要	Magnesium oxychloride cement (MOC) has excellent salt corrosion resistance; however, its poor water resistance limits its wide application in engineering structures in salt lakes and saline soil areas. The incineration of waste crop highland barley straw produces a large amount of ash powder. After appropriate treatment, highland barley straw ash (HBSA) can be used in MOC, which can effectively reduce the wastage of natural resources. This study investigates the suit-ability of incorporation of HBSA into MOC. Herein, HBSA was added into MOC using two different approaches: external and internal addition. The influence of the foregoing on the per-formance of MOC and the optimal amount and mixing method of HBSA were evaluated. Through a pore structure test and microstructure characterization, the mechanism of HBSA affecting the properties of MOC was revealed. Combined with the theoretical analysis of the hydration reac-tion, this paper expounds the dynamic law of HBSA affecting the performance of MOC from the aspects of the hydration reaction process and hydration product composition. The results reveal that HBSA is a new admixture suitable for MOC, which can significantly improve the water resistance of MOC. Different from the findings of previous studies, we discovered that the addition of HBSA into MOC can not only improve the water resistance but also improve the mechanical properties. When HBSA is added at a content of 10%, and the external mixing method is used, sufficient magnesium silicate hydrate is formed in the hydration product of MOC, which opti-mizes the pore structure and improves the water resistance of MOC. However, when HBSA is added into MOC using the internal mixing approach, the water resistance and mechanical properties degrade.
WOS研究方向	Construction & Building Technology ; Engineering
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000849046200001
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/159813]
专题	土木工程学院
作者单位	1.Qinghai Minzu Univ, Sch Civil & Transportat Engn, Xining 810000, Peoples R China 2.Qinghai Minzu Univ, Sch Civil & Transportat Engn, Xining, Qinghai, Peoples R China; 3.Lanzhou Univ Technol, Sch Civil Engn, Lanzhou, Gansu, Peoples R China;
推荐引用方式 GB/T 7714	Cao, Feng,Qiao, Hongxia,Shu, Xiuyuan,et al. Potential application of highland barley straw ash as a new active admixture in magnesium oxychloride cement[J]. JOURNAL OF BUILDING ENGINEERING,2022,59.
APA	Cao, Feng,Qiao, Hongxia,Shu, Xiuyuan,Cui, Lijun,Li, Shuangying,&Zhang, Tao.(2022).Potential application of highland barley straw ash as a new active admixture in magnesium oxychloride cement.JOURNAL OF BUILDING ENGINEERING,59.
MLA	Cao, Feng,et al."Potential application of highland barley straw ash as a new active admixture in magnesium oxychloride cement".JOURNAL OF BUILDING ENGINEERING 59(2022).