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| TEST ON ALKALI-ACTIVATED GROUND GRANULATED BLAST-FURNACE SLAG(GGBS) FOR LIANYUNGANG SOFT SOIL STABILIZATION |
| YI Yaolin，LI Chen，SUN Chuan，ZHANG Zhengfu，LIU Songyu |
| (School of Transportation，Southeast University，Nanjing，Jiangsu 210096，China) |
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Abstract In order to mitigate the environmental impacts in terms of high energy consumption，CO2 emissions and no-renewable resources consumption associated with Portland cement(PC) soft soil stabilization，the stabilization effect of alkali-activated ground granulated blast-furnace slag(GGBS) for Lianyugang soft soil was investigated through laboratory test and then it was compared with that of PC. The results show that the Na2CO3-activated GGBS had the minimum stabilization efficacy for this soft soil. NaOH-activated GGBS stabilized soil had the highest unconfined compressive strength(UCS) at 7，28 and 90 days，however its UCS decreased after 90 days. The GGBS-carbide slag stabilized soil had lower 7-day and 28-day UCS than that of PC mix，whilst the former had much higher 90-day and 180-day UCS than the latter. The Na2CO3，NaOH and Na2SO4 could accelerate the strength development rate of GGBS-carbide slag stabilized soil. The Na2CO3-activated GGBS-carbide slag stabilized soil had only slightly higher 7-day，28-day，90-day UCS and lower 180-day UCS than those without Na2CO3. NaOH significantly increased the UCS of GGBS-carbide slag stabilized soil at 7，28 and 90 days. However the UCS decrease was observed from 90 days to 180 days. The Na2SO4 had the highest activating efficacy for GGBS-carbide slag stabilized soil，and thus was suggested to use in practice due to both the economical and environmental benefits.
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Received: 02 May 2013
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| [1] 章定文，刘松玉，于新豹. 连云港海相软土特性研究[J]. 华中科技大学学报：城市科学版，2003，20(4)：71–74.(ZHANG Dingwen，LIU Songyu，YU Xinbao. Study on engineering characteristics of marine clay in Lianyungang[J]. Journal of Huazhong University of Science and Technology：Urban Science，2003，20(4)：71–74.(in Chinese))
[2] 刘松玉，钱国超，章定文. 粉喷桩复合地基理论与工程应用[M]. 北京：中国建筑工业出版社，2006：1–3.(LIU Songyu，QIAN Guochao，ZHANG Dingwen. The principle and application of dry jet mixing composite foundation[M]. Beijing：China Architecture and Building Press，2006：1–3.(in Chinese))
[3] TERASHI M. The state of practice in deep mixing methods[C]// The 3rd International Specialty Conference on Grouting and Ground Treatment. [S.l.]：ASCE Geotechnical Special Publish，2003：25–49.
[4] HOLM G. State of practice in dry deep mixing methods[C]// The 3rd International Specialty Conference on Grouting and Ground Treatment. [S.l.]：ASCE Geotechnical Special Publish，2003：145–163.
[5] CHEW S H，KAMRUZZAMAN A H M，LEE F H. Physicochemical and engineering behavior of cement treated clays[J]. Journal of Geotechnical and Geoenvironmental Engineering，2004，130(7)：696–706.
[6] HIGGINS D D. GGBS and sustainability[J]. Construction Materials，2007，160(3)：99–101.
[7] JAMES R，KAMRUZZAMAN A H M，HAQUEAND A，et al. Behaviour of lime-slag-treated clay[J]. Ground Improvement，2008，161(4)：207–21.
[8] JEGANDAN S，LISKA M，OSMAN A A-M，et al. Sustainable binders for soil stabilization[J]. Ground Improvement，2010，163(1)：53–61.
[9] NIDZAM R M，KINUTHIA J M. Sustainable soil stabilization with blastfurnace slag-a review[J]. Construction Materials，2010，163(3)：157–165.
[10] YI Y L，LISKA M，AL-TABBAA A. Initial investigation into the use of GGBS-MgO in soil stabilization[C]// Proceedings of the 4th International Conference on Grouting and Deep Mixing. [S.l.]：ASCE Geotechnical Special Publication，2012：444–453.
[11] 庄心善，王功勋，田 苾. 含工业废料加固土的特性研究[J]. 土木工程学报，2005，38(8)：114–117.(ZHUANG Xinshan，WANG Gongxun，TIAN Bi. A study on the characteristics of soils consolidated with industrial wastes[J]. China Civil Engineering Journal，2005，38(8)：114–117.(in Chinese))
[12] 方祥位，孙树国，陈正汉，等. GT 型土壤固化剂改良土的工程特性研究[J]. 岩土力学，2006，27(9)：1 545–1 548.(FANG Xiangwei，SUN Shuguo，CHEN Zhenghan，et al. Study on engineering properties of improved soil by GT soil firming agent[J]. Rock and Soil Mechanics，2006，27(9)：1 545–1 548.(in Chinese))
[13] HUANG X，LI Z G，NING J G，et al. Principle and method of optimization design for soft soil stabilizer[J]. Journal of Wuhan University of Technology：Material Science，2009，24(1)：154–160.
[14] ROY D M. Alkali-activated cements：opportunities and challenges[J]. Cement and Concrete Research，1999，29(2)：249–254.
[15] SHI C J，KRIVENKO P V，ROY D. Alkali-activated cements and concretes[M]. New York：Taylor and Francis，2006：6–125.
[16] 董永刚，曹建新，刘 飞，等. 电石渣理化性质的分析与表征[J]. 环境科学与技术，2008，31(9)：95–98.(DONG Yonggang，CAO Jianxin，LIU Fei，et al. Analysis and characterization of physiochemical property of carbide slag[J]. Environmental Science and Technology，2008，31(9)：95–98.(in Chinese))
[17] 顾力扬，易耀林，郭鹏飞，等. 矿粉–熟石灰固化连云港软土试验研究[C]// 第十二届全国地基处理学术讨论会论文集. 昆明：云南人民出版社，2012：217–221.(GU Liyang，YI Yaolin，GUO Pengfei，et al. Laboratory tests on GGBS-hydrated lime for Lianyugang soft soil stabilization[C]// Proceedings of the 12th National Academic Conference on Ground Improvement. Kunming：Yunnan People?s Press，2012：217–221.(in Chinese))
[18] SONG S，SOHN D，JENNINGS H M，et al. Hydration of alkali-activated ground granulated blast-furnace slag[J]. Journal of Materials Science，2000，35(1)：249–257.
[19] CHEN W. Hydration of slag cement：theory，modeling and application[Ph. D. Thesis][D]. Netherlands：University of Twente，2006.
[20] RICHARDSON J M，BIERNACKI J，STUTZMAN P E，et al. Stoichiometry of slag hydration with calcium hydroxide[J]. Journal of the American Ceramic Society，2002，85(4)：947–953.
[21] YANG K，CHO A R，SONG J K，et al. Hydration products and strength development of calcium hydroxide-based alkali-activated slag mortars[J]. Construction and Building Materials，2012，29：410–419.
[22] 彭家惠，楼宗汉. 钙矾石形成机制的研究[J]. 硅酸盐学报，2000，28(6)：511–515.(PENG Jiahui，LOU Zonghan. Study on the mechanism of ettringite formation[J]. Journal of the Chinese Ceramic Society，2000，28(6)：511–515.(in Chinese))
[23] SHI C J. Strength，pore structure and permeability of alkali-activated slag mortars[J]. Cement and Concrete Research，1996，26(12)：1 789–1 799. |
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2013, Vol. 32 
