[1]杨玉玲,杜延军,范日东,等.分散剂改良土-膨润土竖向隔离墙材料黏度试验研究[J].东南大学学报(自然科学版),2014,44(3):650-654.[doi:10.3969/j.issn.1001-0505.2014.03.035]
 Yang Yuling,Du Yanjun,Fan Ridong,et al.Experimental study on viscosity of soil-bentonite vertical cut-off wall backfills amended with dispersant[J].Journal of Southeast University (Natural Science Edition),2014,44(3):650-654.[doi:10.3969/j.issn.1001-0505.2014.03.035]
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分散剂改良土-膨润土竖向隔离墙材料黏度试验研究()
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《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
44
期数:
2014年第3期
页码:
650-654
栏目:
环境科学与工程
出版日期:
2014-05-16

文章信息/Info

Title:
Experimental study on viscosity of soil-bentonite vertical cut-off wall backfills amended with dispersant
作者:
杨玉玲杜延军范日东陈左波
东南大学岩土工程研究所, 南京 210096
Author(s):
Yang Yuling Du Yanjun Fan Ridong Chen Zuobo
Institute of Geotechnical Engineering, Southeast University, Nanjing 210096, China
关键词:
隔离墙 土-膨润土 分散剂 表观黏度 最优掺量
Keywords:
cutoff wall soil-bentonite dispersant apparent viscosity optimum content
分类号:
X820.6
DOI:
10.3969/j.issn.1001-0505.2014.03.035
摘要:
为改善土-膨润土竖向隔离墙材料的分散性,增强隔离墙阻滞污染物能力,对添加3种不同磷酸盐分散剂的土-膨润土回填料进行了黏度试验,研究了不同分散剂掺量下回填料表观黏度的变化规律.试验结果表明:3种磷酸盐分散剂均可显著减小土-膨润土回填料表观黏度;分散剂掺量从0%增加到0.1%,回填料表观黏度急剧下降,继续增加分散剂掺量,回填料表观黏度趋于平稳或略有增长;添加磷酸盐分散剂后,增加膨润土含量对回填料分散性影响不大,可通过添加磷酸盐分散剂的方法提高回填料对膨润土的负载量;六偏磷酸钠分散效果稍优于三聚磷酸钠和焦磷酸钠.同时,建议0%,5%,10%膨润土含量回填料对应的3种分散剂最优掺量为0.05%,0.1~0.5%,0.5%.磷酸盐分散剂在改善隔离墙材料分散性、提高墙体对污染物的阻滞能力方面具有潜在的工程实用价值.
Abstract:
Three types of phosphate dispersants, including sodium hexametaphosphate, sodium tripolyphosphate and sodium pyrophosphate, are added to the soil-bentonite backfill in vertical cutoff wall in order to improve dispersed structure of the backfill and enhance its performance of mitigating contaminants. The apparent viscosity of the backfill amended with dispersant is measured and the relationship between the dispersant content and the apparent viscosity of the backfill is studied. The test results show that the apparent viscosity reduces significantly when the backfill is amended with three types of dispersants. The apparent viscosity decreases sharply when the dispersant content is increased from 0% to 0.1%, while further increase makes the apparent intensity maintain stable or show a slight rebound. Due to the negligible effect of bentonite content on the disperse property of the backfill amended with dispersant, the bentonite loading of the backfill can be increased by the addition of dispersant. The dispersive capacity of sodium hexametaphosphate is slightly better than those of the others. The optimum contents of the dispersant are 0.05%, 0.1% to 0.5%, and 0.5% corresponding to the backfills with bentonite contents of 0%, 5%, and 10%. The phosphate dispersant has a potential to be used in engineering applications to improve the dispersity of cutoff wall backfills and enhance the performance of the wall to retard contaminant migration.

参考文献/References:

[1] Xie J, Li F S. Overview of the current situation on brownfield remediation and redevelopment in China [R]. Washington DC: The World Bank, 2010.
[2] 杜延军, 金飞, 刘松玉, 等. 重金属工业污染场地固化/稳定处理研究进展[J]. 岩土力学, 2011, 32(1): 116-124.
  Du Yanjun, Jin Fei, Liu Songyu, et al. Review of stabilization/solidification technique for remediation of heavy metals contaminated lands [J]. Rock and Soil Mechanics, 2011, 32(1): 116-124.(in Chinese)
[3] Hong C S, Shackelford C D, Malusis M A. Consolidation and hydraulic conductivity of zeolite-amended soil-bentonite backfills [J]. Journal of Geotechnical and Geoenvironmental Engineering, 2012, 138(1): 15-25.
[4] United States Environmental Protection Agency. Evaluation of subsurface engineered barriers at waste sites EPA 542-R-98-005[R]. Washington DC: US EPA, 1998.
[5] Malusis M A, Yeom S, Evans J C. Hydraulic conductivity of model soil-bentonite backfills subjected to wet-dry cycling [J]. Canadian Geotechnical Journal, 2011, 48(8): 1198-1211.
[6] Katsumi T, Kamon M, Inui T, et al. Hydraulic barrier performance of SBM cut-off wall constructed by the trench cutting and re-mixing deep wall method [C]//ASCE GeoCongress. New Orleans, LA,USA, 2008: 628-635.
[7] Jo H Y, Benson C H, Shackelford C D, et al. Long-term hydraulic conductivity of a geosynthetic clay liner permeated with inorganic salt solutions [J]. Journal of Geotechnical and Geoenvironmental Engineering, 2005, 131(4): 405-417.
[8] Lagaly G. Principles of flow of kaolin and bentonite dispersions [J]. Applied Clay Science, 1989, 4(2): 105-123.
[9] Yoon J S, El Mohtar C S. Time dependent rheological behavior of modified bentonite suspensions [C]//ASCE GeoCongress. Oakland, CA, USA, 2012: 1195-1204.
[10] Papo A, Piani L, Ricceri R. Sodium tripolyphosphate and polyphosphate as dispersing agents for kaolin suspensions: rheological characterization [J]. Colloids and Surfaces A: Phusicochemical and Engineering Aspects, 2002, 201(1): 219-230.
[11] Andreola F, Castellini E, Manfredini T, et al. The role of sodium hexametaphosphate in the dissolution process of kaolinite and kaolin [J]. Journal of the European Ceramic Society, 2004, 24(7): 2113-2124.
[12] American Petroleum Institute. API 13A specification for drilling fluids materials[S]. Washington DC: API, 2010.
[13] American Society for Testing and Materials. ASTM C143/C143M-12 standard test method for slump of hydraulic-cement concrete [S]. West Conshohocken, PA, USA: ASTM, 2012.
[14] Sridharan A, Rao S M, Murthy N S. Discussion: compressibility behavior of homoionized bentonites [J]. Geotechnique, 1987, 37(4): 533-535.
[15] Ma M. The dispersive effect of sodium hexametaphosphate on kaolinite in saline water [J]. Clays and Clay Minerals, 2012, 60(4): 405-410.

备注/Memo

备注/Memo:
收稿日期: 2013-10-06.
作者简介: 杨玉玲(1986—),女,博士生;杜延军(联系人),男,博士,教授,博士生导师,duyanjun@seu.edu.cn.
基金项目: 国家自然科学基金资助项目(51278100)、江苏省自然科学杰出青年基金资助项目(BK2012022).
引用本文: 杨玉玲,杜延军,范日东,等.分散剂改良土-膨润土竖向隔离墙材料黏度试验研究[J].东南大学学报:自然科学版,2014,44(3):650-654. [doi:10.3969/j.issn.1001-0505.2014.03.035]
更新日期/Last Update: 2014-05-20