Strength enhancement in high silica wood ash stabilized lateritic soil using sodium tetraoxosulphate VI (Na 2 SO 4 ) as
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International Journal of Pavement Research and Technology Journal homepage: www.springer.com/42947
Strength enhancement in high silica wood ash stabilized lateritic soil using sodium tetraoxosulphate VI (Na2SO4) as activator Johnson R. Oluremia,b, Walied A. Elsaigha, Bolanle D. Ikotuna, Olukorede M. Osuolaleb, Solomon I. Adedokunc*, Segun E,Oyelakinb, Olorundare P. Ayodeleb a Department
of Civil and Chemical Engineering, College of Science, Engineering and Technology, University of South Africa, Pretoria, South Africa of Civil Engineering, Faculty of Engineering and Technology, Ladoke Akintola University of Technology, Ogbomoso. Oyo State, Nigeria c Department of Civil and Environmental Engineering, Faculty of Engineering, University of Lagos, Akoka, Lagos State. Nigeria
bDepartment
Received 1 April 2020; received in revised form 30 August 2020; accepted 5 September 2020
Abstract
Strength enhancement of waste wood ash (WWA) stabilized lateritic soil, classified as A-7-5(11) and ML (silt), was investigated using sodium sulphate (Na2SO4) as an activator. Basic laboratory geotechnical tests for assessing compacted soil as road construction material were carried out on the samples prepared by admixing the lateritic soil with the predetermined percentages of WWA and Na 2SO4 relative to the mass of the soil. The results showed reductions in the percentage of fines as both WWA and Na 2SO4 contents increased. Liquid and plastic limits of the lateritic soil increased with the increasing contents of both WWA and Na 2SO4, and this led to reduction of the plasticity index and hence improved the workability of the soil. The maximum dry density (MDD) of soil increased with corresponding decrease in optimum moisture content (OMC) as the percentage of Na 2SO4 increased. However, MDD increased up to 3% WWA and thereafter decreased. OMC decreased at 3% WWA and then increased with increasing content of WWA. The California bearing ratio increased with increasing contents of WWA but with pronounced increment at 4% Na 2SO4. Satisfactory performance of the lateritic soil was observed with up to 9% WWA and 4% Na2SO4 activation, at which the soil could be used as road subgrade material Keywords: Alkaline activation, Stabilization, Lateritic soil, Consistency limit, Compaction, California bearing ratio
1. Introduction Importance of soil in the construction of civil engineering structures cannot be over emphasized. The foundations of all civil engineering structures, building, highways, airfield, dams, embankments, bridges, canals etc, are founded on soil and their stability must be ensured. Therefore, deficiencies in the properties of soil can greatly affect the stability and serviceability potential of the intending structure. Laterite is a soil group, which are formed under weathering systems productive of the process of laterization i.e. decomposition of ferroalumino–silicate minerals, leaching of the combined silica and base; and the permanent deposition of sesquioxide within the profiles [1]. According to [2],
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