International Journal of Mining and Geo-Engineering

International Journal of Mining and Geo-Engineering

Characterization of fly ash stabilized residual laterite

Document Type : Research Paper

Authors
Adekemi Loretta Ayodele 1
Akinropo Musiliu Olajumoke 1
Sibel Pamucku 2
Adeyemi Babayemi Fajobi 1
Akindehinde Ayotunde Akindahunsi 1
Emmanuella E Foghi 1
1 Department of Civil Engineering Faculty of Technology Obafemi Awolowo University Ile Ife, Nigeria
2 Department of Civil and Environmental Engineering Lehigh University, Bethlehem, USA
10.22059/ijmge.2023.340832.594959
Abstract
The effective use of residual laterite soils is usually hindered because of their mineralogy and high fines content. This paper studied the potential improvement in the geotechnical and mineralogical properties of fly ash-treated residual laterite collected from Southwest Nigeria. Some physical and geotechnical properties, such as plasticity, compaction, unconfined compressive strength (UCS), and California Bearing ratio (CBR) of untreated and treated laterites were determined using ASTM standard methods. Stabilization was achieved by mixing the laterite with varying proportions (0%, 3%, 6%, 9%, 12%, and 15% by mass of dry laterite) of fly ash. Mineralogical analysis of untreated and treated laterite was done using the X-ray diffractometer (XRD). The results showed a slight initial increase at low proportions of fly ash (at 3%) in the plasticity properties and a subsequent decrease (of up to 65%) afterward. The UCS and CBR of the treated laterite increased over 100% (maximum UCS 110% and maximum CBR 183%) at 6% fly ash content. XRD analysis showed the formation of new minerals, predominantly portlandite, within the stabilized soils. This study confirmed that using fly ash for the stabilization of residual laterite soils is potentially viable for road construction.
Keywords
California bearing ratio
Mineralogical analysis
Residual tropical laterite
Southwest Nigeria soil
XRD analysis
Subjects
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International Journal of Mining and Geo-Engineering
Volume 57, Issue 2
Spring 2023
Pages 215-221