Pozzolanic benefit of fly ash and steel slag blends in the development of uniaxial compressive strength of lime stabilized soil


  • Jijo James, Ph. D. SSN College of Engineering http://orcid.org/0000-0002-1167-8066
  • Ebenezer Paul Billy Graham David Tagore Engineering College
  • Mahalakshmi Nagarathinam Tagore Engineering College
  • Mohan Kumar Thaniyarasu Tagore Engineering College
  • Jayapal Madhu Tagore Engineering College




ash, blends, lime, slag, soil, strength


This investigation involved the examination of pozzolanic benefits that resulted from the amendment of lime stabilization of a soil by using a combination of two industrial wastes viz. Fly ash (FA) and Steel Slag (SS). Two lime contents (6% and 8%), which represented the control specimens, were selected for stabilizing the soil, one above the Initial Consumption of Lime (ICL) and the other above the Optimum Lime Content (OLC), respectively. The lime to total solid waste ratio was maintained as 1:1, and the FA/SS ratio varied within the total solid waste content adopted for amending lime stabilization. The unconfined compressive strength (UCS) of the stabilized samples were determined by casting UCS specimens of 38 x 76 mm and cured for 2 hours, 7, 14 and 28 days. After curing, the specimens were strained until failure, to study the pozzolanic benefits of adding FA-SS. The results revealed that the addition of FA and SS improved the pozzolanic strength, ranging from 3.5% to 15%. The optimal dosage of FA and SS also varied with the lime content adopted. For the 6% lime content, a FA/SS ratio of 1:1 was found to be optimal, whereas for the 8% lime content, a FA/SS ratio of 3:1 was found to develop the maximum strength. The amendment of lime stabilization with FA/SS clearly brought about the difference in lime stabilization stages, unseen when only lime was adopted as stabilizer.


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James, J, David, E P B G, Nagarathinam, M, Thaniyarasu, M K, & Madhu, J. (2018). Pozzolanic benefit of fly ash and steel slag blends in the development of uniaxial compressive strength of lime stabilized soil. Revista Facultad de Ingeniería, 27(49), 7–21. https://doi.org/10.19053/01211129.v28.n49.2018.8544