Influences of CaCl2 Solution Added to Electrodes on the Electro-osmotic Test of Kaolin Clay

FENG Qing-peng; BU Fan-bo; PENG Yi; PENG Jie

doi:10.11988/ckyyb.20160469

PDF(2516 KB)

Journal of Changjiang River Scientific Research Institute ›› 2017, Vol. 34 ›› Issue (8) : 90-95. DOI: 10.11988/ckyyb.20160469

Influences of CaCl₂ Solution Added to Electrodes on the Electro-osmotic Test of Kaolin Clay

FENG Qing-peng^{1, 2}, BU Fan-bo³, PENG Yi^{1, 2}, PENG Jie^{1, 2}

Author information +

History +

Abstract

The changes of electricity current, water discharge, interfacial resistance and final shear strength after CaCl₂ solution was added to electrodes during the electro-osmosis of kaolin clay were studied through laboratory test. Results show that adding CaCl₂ solution to the electrodes could effectively control the decrease of current in soil, and the current strength is not only related to the amount of added CaCl₂ solution, but probably also to the proportion of CaCl₂ solution added to the anode, or the time when the CaCl₂ solution is added. Displacement becomes larger, improving by 10.9% under the condition of the present experiment. The decrease of interfacial resistance of anode is obvious. The total resistivity of the kaolin soil declines obviously with the resistivity decline of the soil near cathode making the main contribution. Moreover, the average shear strength near anode and in the middle of the soil increases obviously, especially the average shear strength near anode of the soil increases by 16.4 kPa; whereas the average shear strength of the soil near the cathode does not increase. Therefore, reversing the electrodes could be an approach of electro-osmosis test on kaolin soil near the cathode.

Key words

kaolin clay / electro-osmosis / electrodes / CaCl2 solution / resistivity of soil / interfacial resistance / shear strength

Cite this article

EndNote

Ris (Procite)

Bibtex

Download Citations

FENG Qing-peng, BU Fan-bo, PENG Yi, PENG Jie. Influences of CaCl₂ Solution Added to Electrodes on the Electro-osmotic Test of Kaolin Clay[J]. Journal of Changjiang River Scientific Research Institute. 2017, 34(8): 90-95 https://doi.org/10.11988/ckyyb.20160469

References

[1] SCHIFANO V C. Electrical Treatment of Clays[D]. Champaign, Illinois: University of Illinois at Urbana-Champaign, 2001.
[2] CASAGRANDE I L.Electro-osmosis in Soils[J].Geotechnique, 1949,1(3):159-177.
[3] BOIKO I V. Electrochemical Hardening of Argillaceous Soils[J]. Journal of Applied Chemistry of the USSR, 1956, 29(3): 203-223.
[4] BJERRUM L,MOUM J,EIDE O. Application of Electro-osmosis to a Foundation Problem in a Norwegian Quick Clay[J]. Geotechnique, 1967,17(3):214-235.
[5] ESRIG M L, GEMEINHARDT J P. Electrokinetic Stabilization of an Illitic Clay[J]. Journal of the Soil Mechanics and Foundations Division, ASCE,1968, 94(4):109-128.
[6] GRAY D H. Electrochemical Hardening of Clay Soils[J]. Geotechnique, 1970, 20(1): 81-93.
[7] OZKAN S, GALE R J, SEALS R K . Chemical Stabilization of Kaolinite by Electrochemical Injection[C]∥Geo-Institute of ASCE. ASCE Annual Convention, Boston, Massachusetts, United States, October 18-21, 1998: 285-297.
[8] OZKAN S, GALE R J, SEALS R K. Electrokinetic Stabilization of Kaolinite by Injection of Al and P O 4 3 - ions[J]. Proceedings of the Institution of Civil Engineers: Ground Improvement, 1999, 3(4):135-144.
[9] ALSHAWABKEH A, SHEAHAN T. Stabilizing Fine-grained Soils by Phosphate Electrogrouting[J]. Journal of the Transportation Research Board, 2002, (1): 53-60.
[10] ALSHAWABKEH A, SHEAHAN T. Soft Soil Stabilization by Ionic Injection under Electric Fields[J]. Proceedings of the Institution of Civil Engineers: Ground Improvement, 2003, 7(4): 177-185.
[11] MOHAMEDELHASSAN E, SHANG J Q. Electrokinetics-generated Pore Fluid and Ionic Transport in an Offshore Calcareous Soil[J]. Canadian Geotechnical Journal, 2003, 40(6): 1185-1199.
[12] ASAVADORNDEJA P,GLAWE U.Electrokinetic Strengthening of Soft Clay Using the Anode Depolarization Method[J]. Bulletin of Engineering Geology and Environment, 2005, 64(3): 237-245.
[13] OU C Y, CHIEN S C, WANG Y G. On the Enhancement of Electroosmotic Soil Improvement by the Injection of Saline Solutions[J]. Applied Clay Science, 2009, 44(1/2): 130-136.
[14] CHIEN S C, OU C Y, WANG M K. Injection of Saline Solutions to Improve the Electro-osmotic Pressure and Consolidation of Foundation Soil[J]. Applied Clay Science, 2009, 44(3/4): 218-224.
[15] CHANG H W, KRISHNA P G, CHIEN S C, et al . Electro-osmotic Chemical Treatments: Effects of Ca 2+ Concentration on the Mechanical Strength and pH of Kaolin[J]. Clays and Clay Minerals, 2010, 58(2): 154-163.
[16] OTSUKI N, YODSUDJAI W, NISHIDA T. Feasibility Study on Soil Improvement Using Electrochemical Technique[J]. Construction and Building Materials, 2007, 21(5): 1046-1051.
[17] 李洪艺, 张澄博, 张永定. 盐溶液注入对电动加固软土影响的研究进展[C]∥2011 年全国工程地质学术年会论文集.北京:科学出版社, 2011:288-293.
[18] 韩舰辉, 王宁伟, 白小航, 等. 海相软黏土电化学改性固结试验研究[J]. 水利与建筑工程学报, 2014, 12(4): 9-13.
[19] 王宁伟, 刘根, 王心哲, 等. 软土电化学加固的排水作用研究[J]. 工程勘察, 2016,44(1): 26-30.
[20] 王宁伟, 柴高炯, 刘根, 等. 氯化钙电化学加固软土的试验研究[J]. 工程勘察, 2017, 45(1): 23-27.
[21] 李文宇,江美英. 膨胀土的电化学改性试验研究[J]. 长江科学院院报, doi:10.11988/ckyyb.20170153.