Geotechnical and microstructural properties of cement-treated laterites stabilized with rice husk ash and bamboo leaf ash

Emeka Segun  Nnochiri; Olumide Moses Ogundipe; Samuel Akinlabi  Ola

doi:10.14311/AP.2021.61.0722

Authors

Emeka Segun Nnochiri Afe Babalola University, Ado-Ekiti, College of Engineering, Department of Civil and Environmental Engineering, PMB 5454, Ado-Ekiti, Nigeria
Olumide Moses Ogundipe Ekiti State University, Ado-Ekiti, College of Engineering, Department of Civil Engineering, PMB 5353, Ado-Ekiti, Nigeria
Samuel Akinlabi Ola Afe Babalola University, Ado-Ekiti, College of Engineering, Department of Civil and Environmental Engineering, PMB 5454, Ado-Ekiti, Nigeria

DOI:

https://doi.org/10.14311/AP.2021.61.0722

Keywords:

bamboo leaf ash, laterite soil, ordinary Portland cement, rice husk ash, soil stabilization

Abstract

This study investigated the geotechnical and microstructural properties of cement-treated laterites stabilized with rice husk ash and bamboo leaf ash. In going about the tests, the soil sample was subjected to compaction, California Bearing Ratio (CBR) and preliminary tests; such as specific gravity, particle size distribution and Atterbergs limits to determine its index properties. Thereafter, the soil sample was mixed with cement at varying proportions of 0–12% at 2% intervals and also, separately mixed with bamboo leaf ash (BLA) and rice husk ash (RHA) in proportions of 0–16% at 2% intervals. The mixes at each stage were subjected to compaction, Atterberg limits and CBR tests. The highest values were 66.7% and 54.8% for unsoaked and soaked CBR at 6% cement+8% BLA and 78.5% and 63.8% for unsoaked and soaked CBR at 8% cement+8% RHA. Samples at these optimal CBR values were subjected into Scanning Electron Microscopy (SEM) and X-Ray Diffraction (XRD) tests. Results showed that new compounds were formed and there were changes in the microstructural arrangements. It can therefore be concluded that pozzolanic and cement hydration reactions actually took place in the course of stabilization.

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