Stabilisation of Lateritic Soil for Road Construction Using Banana Leaf Ash

In view of the need to stabilise poor lateritic soil for road construction, this study investigated effects banana leaf ash (content retained on British Standard sieve No. 40) strength characteristics selected soils. This is with a ascertaining possibility using referenced (BLA) content soils, construction purpose. To achieve aim study, two samples were collected from identified borrow pits (one sample each pit – referred as Sample A and B respectively) in Ile-Ife, southwestern Nigeria. Using standard procedure, preliminary geotechnical tests conducted their natural states. BLA was then prepared introduced soils at varying proportions 2 %, 4 % 6 by weight dry soil. The Atterberg limits California bearing ratio (CBR) subsequently determined treated For results showed that: plasticity index values 22.91 26.60 respectively; specific gravity 2.71 2.75 optimum moisture (OMC) maximum density (MDD) 26.50 1.325 Mg/m3 respectively, while 19.80 1.643 CBR 6.85 11.36 respectively. With addition BLA: generally reduced lowest (4.89 6.24 content; steadily increased until (10.23 22.73 obtained content. concluded could be used improve properties purpose; particle size does not diminish quality soil-stabilising agent.