Abstract
Guzape Laterite shows cracking surface during dry season and has a high permeability and expand heavily during wet season. Unpleasant features of laterite, such as its expansive nature, present difficulties for building a road without stabilizing the soil. This study looked at the use of leftover waste from industrial and agricultural activities as stabilizing materials to enhance laterite's qualities and remove waste from the surrounding environment. At 2%, 5%, 10%, 15%, 20% and 25% of the rice husk ash combined with a constant marble dust 10% with laterite. To determine the changes in laterite characteristics, geotechnical experiments were carried out. Geotechnical tests such as California bearing ratio, Atterberg limit, unified compressive strength, compaction and free swell index, were examined. The properties of the natural laterite showed high permeability, also the compaction characteristics indicated that the maximum dry density reduced while the optimum moisture content reduced as the percentages of RHA and MD increases. The highest MDD is in the mix of RHA (25%): MD (10%). The consistent increase was noticed for the values of UCS. Atterberg limit showed a reduction in LL for this same mix. Conclusively, the properties of laterite have improved a bit with a certain proportion of discarded agricultural and industrial materials use thereby reducing the nuisance from this waste. Yet, further investigation may yield better options, and it is imperative to assess the environmental impact of RHA.

Key words: Laterite, California bearing ratio, Atterberg limit, unified, compressive strength, compaction and free swell index