Strength and microstructural characteristics of cement-solidified salt-rich dredged silt modified by nanoparticles

doi:10.1080/1064119X.2021.1966557

	Strength and microstructural characteristics of cement-solidified salt-rich dredged silt modified by nanoparticles
	Wang, Shiquan 1,2; Lang, Lei 3; Wei, MingLi 2; He, Xingxing 2; Wang, Rui 1; Yu, Chen 1; Feng, Songbao 1; Niu, Zhiyong 1; Ma, Hongrui 1
刊名	MARINE GEORESOURCES & GEOTECHNOLOGY
	2021-08-11
页码	12
关键词	Dredged silt solidification stabilization chloride salt nano-SiO2 nano-MgO strength development
ISSN号	1064-119X
DOI	10.1080/1064119X.2021.1966557
英文摘要	Chemical solidification based on cement is one of the most widely used methods to treat marine dredged silt (DS) with very poor engineering properties. This study investigated the strength and microstructure of cement-solidified salt-rich dredged silt (CSDS) modified by nanoparticles. The unconfined compressive strength (UCS) test showed that the UCS of CSDS containing 9% NaCl was obviously lower than that without NaCl. Furthermore, the detrimental effect of chloride salt on the UCS increased with its content significantly. The nano-SiO2 (NS) used as cement additives can significantly improve the UCS of CSDS and adding 8% NS can reduce cement usage by at least 40%. Compared with NS, the nano-MgO (NM) mainly improved the early UCS of CSDS within 7 days. The needle-like Friedel's salt (the reaction product of chloridion with cement) and lamellar brucite (expansive mineral) were clearly detected by the X-ray diffraction test. The calcium silicate hydrate and magnesium silicate hydrate mainly contributed to construct the skeleton, which was confirmed by the scanning electron microscopy images. The NS and NM with high reactivity can be used as effective cement additives to overcome the negative effect of chloride salt, so as to increase the strength of CSDS.
资助项目	start-up fund for doctoral research of Suzhou University[2019jb18] ; University Students' Innovation and Entrepreneurship Program of Anhui Province[S202010379108] ; University Students' Innovation and Entrepreneurship Program of Anhui Province[S202010379100X] ; 2014 National open project of Suzhou Regional Development Collaborative Innovation Center (general)[2014SZXTKF07] ; Dualability teaching team project of Suzhou University[2020XJSN06] ; Demonstration Teaching Organization of Anhui Education Department[416]
WOS研究方向	Engineering ; Oceanography ; Mining & Mineral Processing
语种	英语
出版者	TAYLOR & FRANCIS INC
WOS记录号	WOS:000691192700001
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/27851]
专题	中科院武汉岩土力学所
通讯作者	Wei, MingLi; He, Xingxing
作者单位	1.Suzhou Univ, Natl Engn Res Ctr Coal Mine Water Hazard Controll, Sch Resources & Civil Engn, Suzhou, Anhui, Peoples R China 2.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan, Peoples R China 3.Shanghai Jiao Tong Univ, State Key Lab Ocean Engn, Shanghai, Peoples R China
推荐引用方式 GB/T 7714	Wang, Shiquan,Lang, Lei,Wei, MingLi,et al. Strength and microstructural characteristics of cement-solidified salt-rich dredged silt modified by nanoparticles[J]. MARINE GEORESOURCES & GEOTECHNOLOGY,2021:12.
APA	Wang, Shiquan.,Lang, Lei.,Wei, MingLi.,He, Xingxing.,Wang, Rui.,...&Ma, Hongrui.(2021).Strength and microstructural characteristics of cement-solidified salt-rich dredged silt modified by nanoparticles.MARINE GEORESOURCES & GEOTECHNOLOGY,12.
MLA	Wang, Shiquan,et al."Strength and microstructural characteristics of cement-solidified salt-rich dredged silt modified by nanoparticles".MARINE GEORESOURCES & GEOTECHNOLOGY (2021):12.