An Electrochemical Modification of Expansive Soil

LI Wen-yu; JIANG Mei-ying

doi:10.11988/ckyyb.20170153

PDF(2348 KB)

Journal of Changjiang River Scientific Research Institute ›› 2018, Vol. 35 ›› Issue (7) : 100-105. DOI: 10.11988/ckyyb.20170153

ROCKSOIL ENGINEERING

An Electrochemical Modification of Expansive Soil

LI Wen-yu¹, JIANG Mei-ying²

Author information +

History +

Abstract

The properties of expansive soil were improved by electrochemical method with hydroxyl-aluminum solution for electrolyte. The modified soil specimens were divided into three parts: part A (anode), part C (cathode), and part M (middle). Macroscopic and microscopic tests were carried out on the three parts and natural soils. Results revealed that the clay content of modified soils decreased and the silt content increased. The specific surface area and pore size decreased, which made the contact between soil particles closer, resulting in the increase of internal friction angle. Meanwhile, the water-holding capacity of soil particles reduced, indicating that the hydrophilia weakened. Moreover, the free swell of soil samples was greatly lowered. The changes in the properties are attributed to the ion exchange of [Al₁₃]⁷⁺ and the local pH changes which thin the diffused double layer and weaken the interparticle repulsion. In addition, the effects of improvement on the three parts were different due to the influence of the applied electric field on diffused double layer and the anisotropy of soil microstructure.

Key words

expansive soil / electrochemical modification / hydroxyl-aluminum / ion exchange / electrified soil particles / diffused double layer

Cite this article

EndNote

Ris (Procite)

Bibtex

Download Citations

LI Wen-yu, JIANG Mei-ying. An Electrochemical Modification of Expansive Soil[J]. Journal of Changjiang River Scientific Research Institute. 2018, 35(7): 100-105 https://doi.org/10.11988/ckyyb.20170153

References

[1] 程钰,石名磊,周正明. 消石灰对膨胀土团粒化作用的研究[J]. 岩土力学, 2008, 29(8): 2209-2214.
[2] 罗逸, 李国华,张慧. 有机阳离子化合物对改善膨胀土性质的影响[J]. 岩土工程学报, 1996, 18(5): 40-44.
[3] 王军, 张乐, 刘飞禹,等. 真空预压-电渗法联合加固软黏土地基试验研究[J]. 岩石力学与工程学报, 2014, 33(增2): 4181-4192.
[4] 焦丹, 龚晓南,李瑛. 电渗法加固软土地基试验研究[J]. 岩石力学与工程学报, 2011, 30(增1): 3208-3216.
[5] 符洪涛, 王军, 蔡袁强,等. 低能量强夯-电渗法联合加固软黏土地基试验研究[J]. 岩石力学与工程学报, 2015, 34(3): 612-620.
[6] QU J, LIU H. Optimum Conditions for Al₁₃ Polymer Formation in PACl Preparation by Electrolysis Process[J]. Chemosphere, 2004, 55(1): 51-56.
[7]FURRER G, LUDWIG C, SCHINDLER P W. On the Chemistry of the Keggin Al₁₃ Polymer: I. Acid-base Properties[J]. Journal of Colloid and Interface Science, 1992, 149(1): 56-67.
[8] XU Y, WANG D S, LIU H, et al. Optimization of the Separation and Purification of Al₁₃[J]. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2003, 231(1/2/3): 1-9.
[9] PINNAVAIA T J. Intercalated Clay Catalysts[J]. Science, 1983, 220(4595): 365-371.
[10]ZHU R L, WANG T, GE F, et al. Intercalation of Both CTMAB and Al-13 into Montmorillonite[J]. Journal of Colloid and Interface Science, 2009, 335(1): 77-83.
[11]LAHAV N, SHANI U, SHABTAI J, et al. Cross-linked Smectites.1. Synthesis and Properties of Hydroxy-aluminum-montmorillonite[J]. Clays and Clay Minerals, 1978, 26(1): 107-115.
[12]BRINDLEY G W, SEMPELS R E. Preparation and Properties of Some Hydroxy-aluminium Beidellites[J]. Clay Minerals, 1977, 12(3): 229-237.
[13]GIL A, MONTES M. Analysis of the Microporosity in Pillared Clays[J]. Langmuir, 1994, 10(10): 291-297.
[14]DAS B M. Advanced Soil Mechanics[M]. Boca Raton: CRC Press, 2013.
[15]DELGADO A V, GONZLEZ-CABALLERO F, HUNTER R J, et al. Measurement and Interpretation of Electrokinetic Phenomena[J]. Journal of Colloid and Interface Science, 2007, 309(2): 194-224.
[16]JOHANSSON G. On the Crystal Structures of Some Basic Aluminium Salts[J]. Acta Chemica Scandinavica, 1960,14(3): 771-773.
[17]CHEN Zhao-yang, LUAN Zhao-kun, FAN Jing-hua, et al. Effect of Thermal Treatment on the Formation and Transformation of Keggin Al₁₃ and Al₃₀ Species in Hydrolytic Polymeric Aluminum Solutions[J]. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2007, 292(2/3): 110-118.
[18]姚海林, 程平, 杨洋,等. 标准吸湿含水率对膨胀土进行分类的理论与实践[J]. 中国科学E辑:工程科学材料科学, 2005, 35(1): 43-52.
[19]杨雅秀. 中国黏土矿物[M]. 北京:地质出版社, 1994.