Critical State of Compacted Lateritic Soil and Palm Kernel Shells Ash for Earth Embankments. Issue 3 (9th August 2019)

• Record Type: Journal Article
• Authors: Okonkwo, Ugochukwu Nnatuanya
• Is Part Of: Proceedings of the Institution of Civil Engineers. Volume 172:Issue 3(2019:Aug.)
• Page Start: 1
• Page End: 27
• Publication Date: 2019-08-09
• Subjects: Embankments -- Geotechnical Engineering -- Strength and Testing of Materials; Soil stabilization -- Periodicals; Geotechnical engineering -- Periodicals; Grouting (Soil stabilization) -- Periodicals; 624.1513605
• DOI: 10.1680/jgrim.19.00005
• Languages: English
• ISSNs: 1755-0750

Abstract

Abstract : For most treated soils in compacted form for earth embankments, interest had been limited to the maximum stresses they can sustain before failure. This, work studied the stress-strain behaviour of a compacted lateritic soil treated with palm kernel shells ash (PKSA) from 0-18% at 3% intervals, with a major focus on the critical state characteristics (beyond the maximum stresses). The lateritic soil was characterized to be A-2-6(0) in the AASHTO rating and clayey-sand (SC) in the Unified Soil Classification System. The palm kernel shells ash was found to be pozzolanic. The British Standard Light energy level of compaction and the drained shear test were carried out on the treated soil. The optimum moisture content increased while maximum dry density reduced with increase in palm kernel shells ash content. The palm kernel shells ash of 0-18% content by weight of the dry soil improved the strength properties of the lateritic soil by 51.43%. The critical state parameters λ, Γ and M of the soil mixtures were found to be in conformity with the usual range for untreated soils.