Use of an Eletrokinetic Remediated Soil as a Road Subgrade Material

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 ۱۰.۹۷%; The Atterberg limit test showed liquid limit, plastic limit, plasticity index and linear shrinkage of ۳۶.۵۰%, ۲۲.۰۵%,۱۴.۴۵ %, and ۴.۳۰%, respectively. The percentage of ۶۲.۸۰% passes ۰.۰۷۵mm sieve with a maximum dry density (MDD) of ۱.۷۷ Mg/m۳, and the moisture content decreased from ۱۳.۲% to ۱۱.۸۱%. The soil is classified as A-۶ 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 ۴۶.۶۳kN/m۲ to ۹۲.۶۴kN/m۲; from ۱۸% to ۲۳%; and from ۲.۵۵% to ۴.۰۵% 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.

کلیدواژه ها:

Atterberg limit ، California bearing ratio ، Crude Oil Contaminated Soil ، Electrokinetic remediated soil ، Subgrade ، unconfined compression strength