Title: Stabilisation of lateritic soil with pulverised ceramic waste for road construction

Authors: Adeyemi Oluwaseun Adeboje; Williams Kehinde Kupolati; Emmanuel Rotimi Sadiku; Julius Musyoka Ndambuki; Abdulrazak Olaide Owolabi; Chewe Kambole

Addresses: Department of Civil Engineering, Tshwane University of Technology, Pretoria, South Africa ' Department of Civil Engineering, Tshwane University of Technology, Pretoria, South Africa ' Department of Chemical, Metallurgical and Materials Engineering, Tshwane University of Technology, Pretoria, South Africa ' Department of Civil Engineering, Tshwane University of Technology, Pretoria, South Africa ' Department of Civil and Environmental Engineering, University of Lagos, Lagos, Nigeria ' Department of Civil Engineering, Tshwane University of Technology, Pretoria, South Africa

Abstract: Lateritic soil is used for the construction of road pavement layers in the tropics. The engineering properties of lateritic soil can be improved by using additives in order to make it suitable for road pavement construction. Such additives can be agricultural waste or other suitable materials. In this research, the influence of adding varying proportions of pulverised ceramic waste (PCW) to lateritic soil was evaluated. The materials used for the study were lateritic soil and PCW samples. The control and lateritic soil samples with addition of 5%, 7.5%, 10% and 12.5% PCW were considered for specific gravity, grain size analysis, Atterberg limits, compaction, California bearing ratio and unconfined compressive strength tests. The plasticity index reduced from 12.17% to 11.98% from the control (0%) to 12.5% addition of PCW; the maximum dry density increased from 1.76 to 1.95 kN/m³ while the corresponding optimum moisture content of the lateritic soil decreased from 14.76% to 11.63%. The specific gravity of the lateritic soil and PCW were 2.63 and 2.82 respectively. The addition of 12.5% PCW increased the California bearing ratio and the unconfined compressive strength of the lateritic soil by 129% and 175% respectively.

Keywords: California bearing ratio; CBR; lateritic soil; pulverised ceramic waste; soil index properties; soil stabilisation; unconfined compressive strength; UCS.

DOI: 10.1504/IJEE.2020.107425

International Journal of Environmental Engineering, 2020 Vol.10 No.3, pp.221 - 242

Received: 29 Oct 2018
Accepted: 30 Aug 2019
Published online: 28 May 2020 *

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