Soft Soil Treated with Waste Fluid Catalytic Cracking as a Sustainable Stabilizer Material


  • Zainb S. Al-Khafaji The Ministry of Construction and Housing, National Center for Construction Laboratories, Karbala construction laboratory, Karbala, Iraq
  • Anmar Dulaimi College of Engineering, University of Warith Al Anbiyaa, Iraq
  • Hassnen Jafer Department of Civil Engineering, College of Engineering, University of Babylon, Iraq
  • Zainab Al-Khafaji Al-Turath University College‏, Baghdad, Iraq: Al-Furat Al-Awsat Distribution Foundation, Ministry of Oil, Babylon, Iraq
  • William Atherton Department of Civil Engineering, Liverpool John Moores University, Peter Jost Enterprise Centre, Byrom Street, Liverpool. UK
  • Safa A. Hussien Building and Construction Engineering Technology Department/ Al-Mustaqbal University College, Babylon, Iraq



Silty clayey soil, Fluid catalytic cracking, Unconfined compressive strengths, Scanning electronic microscopy


This research aims to stabilize clayey soil utilizing fluid catalytic cracking with an unchangeable ordinary portland cement ratio of 3 percent. A soft clayey soil was blended with 1.5, 3, 4.5, and 6 percent of fluid catalytic cracking by the dry stabilized soil weight, the ordinary portland cement amount has been fixed at 3 percent. The adding of different FCC ratios impact cement stabilized soil evaluated based on the results of an unconfined-compressive-strengths test that gained after curing for 7 and 28 days. It was noticeable from the results that the best combination is the combination of soil remedied with 3 percent of each cement and FCC in improving the compressive strengths from 249.80 to 806.20k Pa for the stabilized soil after curing for 28 days. The most highlighting soil binder combination was analyzed utilizing scanning electron microscopy. It was noticed from the scanning electron microscopy results; cementitious materials were produced after 7 days of curing and improved more after curing for eight days.