Alkali-Activated Ground-Granulated Blast Furnace Slag for Stabilization of Marine Soft Clay

被引:117
作者
Yi, Yaolin [1 ,2 ]
Li, Cheng [1 ]
Liu, Songyu [1 ]
机构
[1] Southeast Univ, Inst Geotech Engn, Nanjing 210096, Jiangsu, Peoples R China
[2] Univ Alberta, Dept Civil & Environm Engn, Edmonton, AB T6G 2W2, Canada
关键词
Soft clay; Alkali activation; Ground-granulated blast furnace; Unconfined compressive strength; Microstructure; SULFATE ATTACK; PARTIAL SUBSTITUTION; ETTRINGITE FORMATION; LIME; GGBS; STRENGTH; SOILS; HYDRATION; CEMENTS;
D O I
10.1061/(ASCE)MT.1943-5533.0001100
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
This paper investigated the stabilization efficacy of alkali-activated ground-granulated blast furnace slag (GGBS) for a marine soft clay, compared with that of portland cement (PC). The influence of activators, including NaOH, Na2CO3, carbide slag (CS), NaOH-CS, Na2CO3-CS, and Na2SO4-CS, on the stabilization efficacy was investigated. A range of tests were conducted to investigate the properties of stabilized clays, including unconfined compressive strength (UCS), X-ray diffraction (XRD), scanning electron microscopy (SEM), and mercury intrusion porosimetry (MIP). The results indicated that Na2CO3-GGBS had no stabilization efficacy for this marine soft clay. NaOH-GGBS-stabilized clay yielded the highest UCS at 7, 28, and 90 days; however, the UCS decreased from 90 to 180 days because of the microcracking. CS-GGBS-stabilized clay had higher 90-day and 180-day UCS than that of PC-stabilized clay, but significantly lower 7-day and 28-day UCS. NaOH, Na2CO3, and Na(2)SO(4)could enhance the strength development rate of CS-GGBS-stabilized clay. However, the UCS of NaOH-CS-GGBS and Na2CO3-CS-GGBS-stabilized clays decreased from 90 to 180 days as well. Na2SO4-CS-GGBS was found to be the optimum binder for this marine soft clay, yielding at least twice higher UCS than that of PC stabilized clay at any age studied. Considerable ettringite was produced in the Na2SO4-CS-GGBS stabilized clay, which contributed to the enhanced strength. (C) 2014 American Society of Civil Engineers.
引用
收藏
页数:7
相关论文
共 42 条
[1]  
ASTM, 2017, D163300 ASTM
[2]   Alkali activation of Australian slag cements [J].
Bakharev, T ;
Sanjayan, JG ;
Cheng, YB .
CEMENT AND CONCRETE RESEARCH, 1999, 29 (01) :113-120
[3]  
Bergado D.T., 1996, SOFT GROUND IMPROVEM
[4]   Carbide lime and industrial hydrated lime characterization [J].
Cardoso, Fabio A. ;
Fernandes, Heloisa C. ;
Pileggi, Rafael G. ;
Cincotto, Maria A. ;
John, Vanderley M. .
POWDER TECHNOLOGY, 2009, 195 (02) :143-149
[5]  
CBMA (China Building Materials Academy), 2008, GB1752007 CBMA
[6]   Physicochemical and engineering behavior of cement treated clays [J].
Chew, SH ;
Kamruzzaman, AHM ;
Lee, FH .
JOURNAL OF GEOTECHNICAL AND GEOENVIRONMENTAL ENGINEERING, 2004, 130 (07) :696-706
[7]   Microcracking and strength development of alkali activated slag concrete [J].
Collins, F ;
Sanjayan, JG .
CEMENT & CONCRETE COMPOSITES, 2001, 23 (4-5) :345-352
[8]   Briefing: GGBS and sustainability [J].
Higgins, D. .
PROCEEDINGS OF THE INSTITUTION OF CIVIL ENGINEERS-CONSTRUCTION MATERIALS, 2007, 160 (03) :99-101
[9]  
Higgins D.D., 2005, Soil Stabilisation with Ground Granulated Blast Furnace Slag
[10]  
Holm G., 2003, GEOTECHNICAL SPECIAL, V120, P145, DOI DOI 10.1061/40663(2003)5