Document Type : Original Article


1 Department of Civil Engineering, Nigerian Defence Academy, Kaduna, Nigeria

2 Department of Civil Engineering, Ahmadu Bello University, Zaria, Nigeria


The soil investigated for suitability checks, as a subgrade material in this study, was a crude oil contaminated (COC) soil treated using an electrokinetic technique. The index properties and compaction characteristics of the electrokinetic remediated (EKR) soil are natural moisture content was 10.97%; The Atterberg limit test showed liquid limit, plastic limit, plasticity index and linear shrinkage of 36.50%, 22.05%,14.45 %, and 4.30%, respectively. The percentage of 62.80% passes 0.075mm sieve with a maximum dry density (MDD) of 1.77 Mg/m3, and the moisture content decreased from 13.2% to 11.81%. The soil is classified as A-6 according to AASHTO classification system and belong to clay of low plasticity CL or OL group according to the Unified Soil Classification System. The unconfined compression strength, (UCS), durability, and California bearing ratio (CBR) of the electrokinetic remediated soil improved marginally from 46.63kN/m2 to 92.64kN/m2; from 18% to 23%; and from 2.55% to 4.05% respectively. However, these results obtained, do not meet the minimum requirement of the Nigerian General Specification. As a result, it is advised for further research, that an EKR soil be stabilized using cement stabilization to achieve the desired subgrade strength.


Main Subjects

  1. Chirakkara, R.A., Reddy, K.R., and Cameselle, C., 2015. Electrokinetic Amendment in Phytoremediation of Mixed Contaminated Soil. Electrochimica Acta, 181, pp.179–191. Doi: 10.1016/j.electacta.2015.01.025
  2. Boulakradeche, M.O., Akretche, D.E., Cameselle, C., and Hamidi, N., 2015. Enhanced electrokinetic remediation of hydrophobic organics contaminated soils by the combination of non-ionic and ionic surfactants. Electrochimica Acta, 174, pp.1057–1066. Doi: 10.1016/j.electacta.2015.06.091
  3. Castellano, R.J., Akin, C., Giraldo, G., Kim, S., Fornasiero, F., and Shan, J.W., 2015. Electrokinetics of scalable, electric-field-assisted fabrication of vertically aligned carbon-nanotube/polymer composites. Journal of Applied Physics, 117(21), pp.214306. Doi: 10.1063/1.4921948
  4. Bahemmat, M., Farahbakhsh, M., and Kianirad, M., 2016. Humic substances-enhanced electroremediation of heavy metals contaminated soil. Journal of Hazardous Materials, 312, pp.307–318. Doi: 10.1016/j.jhazmat.2016.03.038
  5. Cameselle, C., and Gouveia, S., 2018. Electrokinetic remediation for the removal of organic contaminants in soils. Current Opinion in Electrochemistry, 11, pp.41–47. Doi: 10.1016/j.coelec.2018.07.005
  6. Adesipo, A.A., Freese, D., and Nwadinigwe, A.O., 2020. Prospects of in-situ remediation of crude oil contaminated lands in Nigeria. Scientific African, 8, pp.e00403. Doi: 10.1016/j.sciaf.2020.e00403
  7. Hussein, A.A., and Alatabe, M.J.A., 2019. Remediation of Lead-Contaminated Soil, Using Clean Energy in Combination with Electro-Kinetic Methods. Pollution, 5(4), pp.859–869. Doi: 10.22059/poll.2019.275250.579
  8. Mohamed Boulakradeche, O., Merdoud, O., and Eddine Akretche, D., 2021. Enhancement of electrokinetic remediation of lead and copper contaminated soil by combination of multiple modified electrolyte conditioning techniques. Environmental Engineering Research, 27(4), pp.210167–0. Doi: 10.4491/eer.2021.167
  9. Wang, Y., Li, A., and Cui, C., 2021. Remediation of heavy metal-contaminated soils by electrokinetic technology: Mechanisms and applicability. Chemosphere, 265, pp.129071. Doi: 10.1016/j.chemosphere.2020.129071
  10. Cameselle, C., and Reddy, K.R., 2013. Effects of Periodic Electric Potential and Electrolyte Recirculation on Electrochemical Remediation of Contaminant Mixtures in Clayey Soils. Water, Air, & Soil Pollution, 224(8), pp.1636. Doi: 10.1007/s11270-013-1636-8
  11. Acar, Y.B., Alshawabkeh, A.N., and Gale, R.J., 1993. Fundamentals of extracting species from soils by electrokinetics. Waste Management, 13(2), pp.141–151. Doi: 10.1016/0956-053X(93)90006-I
  12. Han, D., Wu, X., Li, R., Tang, X., Xiao, S., and Scholz, M., 2021. Critical Review of Electro-kinetic Remediation of Contaminated Soils and Sediments: Mechanisms, Performances and Technologies. Water, Air & Soil Pollution, 232(8), pp.335. Doi: 10.1007/s11270-021-05182-4
  13. B.S. 1377 (1990). “Methods of testing soil for civil engineering purposes”. British Standards Institute, London.
  14. Nigerian General Specifications (volume II ,2016; clause 6201-p195) Roads and Bridges. Federal Ministry of Works and Housing headquarters, Abuja, Nigeria.
  15. AASHTO. (1986). Standard Specifications for Transport Materials and Methods of Sampling and Testing. American Association of State Highway and Transport Officials (AASHTO), Washington, D.C , 14th Edition.
  16. ASTM (1992). Annual Book of Standards Vol. 04.08, American Society for Testing and Materials, Philadelphia.
  17. JAYASEKERA, S., 2015. Electrokinetics to Modify Strength Characteristics of Soft Clayey Soils: A Laboratory Based Investigation. Electrochimica Acta, 181, pp.39–47. Doi: 10.1016/j.electacta.2015.06.064
  18. Sadeghian, F., Jahandari, S., Haddad, A., Rasekh, H., and Li, J., 2022. Effects of variations of voltage and pH value on the shear strength of soil and durability of different electrodes and piles during electrokinetic phenomenon. Journal of Rock Mechanics and Geotechnical Engineering, 14(2), pp.625–636. Doi: 10.1016/j.jrmge.2021.07.017
  19. Sani, J.E., Moses, G., and Oriola, F.O.P., 2020. Evaluating the electrical resistivity of microbial-induced calcite precipitate-treated lateritic soil. SN Applied Sciences, 2(9), pp.1492. Doi: 10.1007/s42452-020-03285-x
  20. Singh, G., and Singh, J., 1991. Highway Engineering’Standard Publishers Distributers. New Delhi.
  21. Ola, S.A., 1983. The geotechnical properties of the black cotton soils of northeastern Nigeria.
  22. TRRL (1977). “A guide to the structural design of bitumen surfaced roads in tropical and sub-tropical countries.” Transport and Road Research Laboratory, Road Note 31, H. M. S. O., London.
  23. Obeta, I.N., Ikeagwuani, C.C., Attama, C.M., and Okafor, J., 2019. Stability and durability of sawdust ash-lime stabilised black cotton soil. Nigerian Journal of Technology, 38(1), pp.75–80. Doi: 10.4314/njt.v38i1.10
  24. Osinubi, K.J., Eberemu, A.O., Gadzama, E.W., and Ijimdiya, T.S., 2019. Plasticity characteristics of lateritic soil treated with Sporosarcina pasteurii in microbial-induced calcite precipitation application. SN Applied Sciences, 1(8), pp.829. Doi: 10.1007/s42452-019-0868-7
  25. Osinubi, K.J., Eberemu, A.O., Ijimdiya, S.T., Yakubu, S.E., and Sani, J.E., 2017. Potential use of B. Pumilus in microbial induced calcite precipitation improvement of lateritic soil. In: Proceedings of the 2nd symposium on coupled phenomena in environmental geotechnics (CPEG2), Leeds, United Kingdom. pp 6–8.
  26. ASTM C618-78(1978). “Specification for Fly Ash and Raw Calcined Natural Pozzolana for use as a Mineral Admixture in Portland Cement Concrete”. American Society for Testing and Materials, Philadelphia.