PERFORMANCE EVALUATION OF STABILIZED CLAYEY SOIL WITH RICE HUSK AND FLY ASHES

Abstract

The study focused on Performance evaluation of clayey soil stabilized with rice husk and fly ashes. Expansive soil otherwise known as problematic clay are considered a potential natural threat which can cause extensive damage to a structure if not adequately treated. The improvements in terms of compaction and strength characteristic were examined. Rice husk and fly ashes were added to the clayey soil sample by dry weight with selected dosage as 0, 2:4, 4:6, 6:8, 8:10 and 10:12%. British standard heavy, British standard light and West African standard compactive effort were employed. Result for the soil identification and classification shows that the soil is classified as A-7-5 according to American Association of State Highway and Transportation Officials (AASHTO) and as Sandy Clay (SC) according to Unified Soil Classification System. the stabilized clayey soil shows 62-76% increment in terms of its compaction characteristic the maximum dry density (MDD) .and a decreased value for its corresponding optimum moisture content (OMC). The CBR and UCS of the clay were improved by 256% and 88% respectively with the optimal values obtained at 2:4% Rice husk and Fly ashes addition. This therefore indicates that the addition of rice husk and fly ashes to a class of clayey soil improves the soil stiffness and resistance to deformation and can be used as a construction material.