Effect of Waste Engine Oil Contamination on the Geotechnical Properties of Cohesive Soils in Sulaimani City, Iraq

Nihad Bahhaaldeen Salih; Tavga Aram Abdalla; Sundus Abbas Ali

doi:10.33261/jaaru.2019.27.1.002

Nihad Bahhaaldeen Salih Irrigation Engineering Department, College of Engineering, University of Sulaimani, Iraq
Tavga Aram Abdalla Civil Engineering Department, College of Engineering, University of Sulaimani, Iraq
Sundus Abbas Ali Civil Engineering Department, College of Engineering, University of Sulaimani, Iraq

DOI: https://doi.org/10.33261/jaaru.2019.27.1.002

Keywords: Waste Engine Oil, Cohesive Soils, Sulaimani City

Abstract

The effect of waste engine oil (WEO) contamination on the geotechnical properties of cohesive soils was investigated. Three cohesive soils were collected from three locations in Sulaimani City. Geotechnical laboratory tests were carried out included consistency properties, unconfined compression strength, swelling pressure, and compressibility properties for both of intact and contaminated soil samples. Various percentages (0%, 1%, 2%, 4% and 6%) of WEO were mixed with the selected cohesive soil as a simulation of the field contamination issue. The results showed that the liquid limit (LL), plastic limit (PL), plasticity index (PI) increased as the content of WEO increased, however, experienced a decrease at 1% WEO content, thereafter an increase commenced again. The values of linear shrinkage limit, unconfined compressive strength (UCS), swelling pressure (SP) and Recompression index (Cr) decreased as the content of the WEO increased. The values of compression index (Cc) also increased at 0%, 1% and 2% WEO content, after that a little increase commenced again. WEO contaminated soil requires stabilization before using it as a construction material and/or for construction projects foundations.