Abstract

This research examined the stabilization of laterite against water penetration on earth (mud) roofs, using Locust Bean Pod Ash (LBPA) and Sugarcane Straw Ash (SCSA). The laterite soil was collected from pits around Hagagawa quarters of Bichi Local Government Area. It was stabilized with different mix ratios of 14, 22 and 30 per cent of LBPA and SCSA with different mix proportions of laterite. These mixes were subjected to permeability test to ascertain their water resistance effectiveness. The results of the test showed that, laterite sample without additives is more porous, thereby, allowing easy penetration of water and thus, not very suitable for roof construction. The suitability of the laterite sample was improved by optimum of LBPA and SCSA at 30 per cent. Also, the least amount of water penetration after 14 and 28 days of curing was with the mix ratio of 70:30, followed by 78:22. The results also showed that the increase in quantity of Locust Bean Pod Ash resulted in greater water resistance than increase in quantity of Sugarcane Straw Ash for both 14 and 28 days curing periods.