Soft clay stabilization using ladle slag-ground granulated blastfurnace slag blend

被引:56
作者
Xu, Bo [1 ]
Yi, Yaolin [1 ]
机构
[1] Nanyang Technol Univ, Sch Civil & Environm Engn, Singapore, Singapore
关键词
Soft clay stabilization; Ladle slag; Ground granulated blastfurnace slag; Strength; Heavy metal; C-S-H; CEMENTITIOUS PROPERTIES; SOIL-STABILIZATION; FURNACE SLAG; FLY-ASH; MAGNESIA; FINES; GGBS;
D O I
10.1016/j.clay.2019.105136
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Ladle furnace basic slag (ladle slag, LS) is a by-product of the steel refining process. There is a great amount of LS generated worldwide every year and the current solution is simply landfilling it, which causes both economic and environmental issues. This study attempts to use LS to activate ground granulated blastfurnace slag (GGBS) for stabilization of soft clay, as well as immobilization of heavy metals in LS. The LS-GGBS-stabilized clays with different binder contents and LS:GGBS ratios were cured for different periods, and then subjected to unconfined compressive strength (UCS) test, leaching test, and X-ray diffraction (XRD). The results indicated that the LSGGBS-stabilized clays with LS:GGBS ratio of 2:8-5:5 could achieve similar or higher UCS compared to ordinary Portland cement-stabilized clay after 56 days of curing. The leaching of potential heavy metals was not detected for the LS-GGBS stabilized clays. According to XRD analysis, the main hydration products of LS-GGBS-stabilized clay were calcium silicate hydrates (CSH) and ettringite, which were responsible for the strength development of LS-GGBS-stabilized clays.
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页数:6
相关论文
共 37 条
[1]   Influence of mineralogy on the hydraulic properties of ladle slag [J].
Adolfsson, Daniel ;
Robinson, Ryan ;
Engstrom, Fredrik ;
Bjorkman, Bo .
CEMENT AND CONCRETE RESEARCH, 2011, 41 (08) :865-871
[2]   Incorporation of aluminum in the calcium silicate hydrate (C-S-H) of hydrated Portland cements:: A high-field 27Al and 29Si MAS NMR Investigation [J].
Andersen, MD ;
Jakobsen, HJ ;
Skibsted, J .
INORGANIC CHEMISTRY, 2003, 42 (07) :2280-2287
[3]  
[Anonymous], 2002, 124572 BS EN
[4]  
[Anonymous], 2017, D431817E1 ASTM
[5]  
[Anonymous], 2018, D497218 ASTM
[6]  
Bergado D.T., 1996, ST GROUND IMPROVEM
[7]   Mix-design and characterization of alkali activated materials based on metakaolin and ladle slag [J].
Bignozzi, Maria Chiara ;
Manzi, Stefania ;
Lancellotti, Isabella ;
Kamseu, Elie ;
Barbieri, Luisa ;
Leonelli, Cristina .
APPLIED CLAY SCIENCE, 2013, 73 :78-85
[8]   Immobilisation of heavy metal in cement-based solidification/stabilisation: A review [J].
Chen, Q. Y. ;
Tyrer, M. ;
Hills, C. D. ;
Yang, X. M. ;
Carey, P. .
WASTE MANAGEMENT, 2009, 29 (01) :390-403
[9]   Briefing: GGBS and sustainability [J].
Higgins, D. .
PROCEEDINGS OF THE INSTITUTION OF CIVIL ENGINEERS-CONSTRUCTION MATERIALS, 2007, 160 (03) :99-101
[10]  
Kanagawa Kuwayama, 1997, Electric Steel, V68, P261, DOI [10.4262/denkiseiko.68.261, DOI 10.4262/DENKISEIKO.68.261]