Geotechnical properties of lateritic soil stabilized with lignocellulosic biomass fly ash

This study considered the need for sustainable road construction using recycled materials. Lignocellulosicbiomass fly ash (LcBFA) gotten from Berlinia Grandiflora (Vahl) Hutch. & Dalziel (Ububa tree, in common Nigerian parlance) was used to stabilise a soil sample characterised as A-2-7 soil. The LcBFA was added to the lateritic soil at varying proportions of 0%, 10%, 20%, 30% and 40%. Chemical characterization of the LcBFA was obtained; particle size analysis, moisture content test, atterberg limit test, proctor compaction test, California bearing ratio value (CBR) test, and specific gravity test were conducted on the soil sample. The results showed an increase in plasticity, an increase in maximum dry density, a decrease of optimum moisture content and an increase in CBR value. It was concluded that LcBFA lacks the potential of serving as a pozzolan.