Behavior of Clayey Soil Stabilized with Rice Husk Ash & Lime (Review)

Abstract

Soil stabilization is gaining popularity among the construction engineers and geotechnical engineering researchers due to the low land to population ratio in India. As the huge quantity of RHA produced by local industry has to be disposed off safely in order to have a minimum impact on the environment. Use of RHA for geotechnical purposes may prove to be a suitable technique for the pollution free disposal of RHA. The present investigation has therefore been carried out with agricultural waste materials like Rice Husk Ash (RHA) which was mixed with soil to study improvement of weak sub grade in terms of compaction and strength characteristics. Silica produced from rice husk ashes have investigated successfully as a pozzolanic material in soil stabilization. However, rice husk ash cannot be used solely since the materials lack in calcium element. As a result, rice husk ash shall be mixed with other cementitious materials such as lime and cement to have a solid chemical reaction in stabilization process. Lime is calcium oxide or calcium hydroxide. In this research work the percentage of lime used was 3%, 6%, 9% and that of RHA were 5%, 10% and15%.

KEYWORDS: Clayey soil; Lime; Rice Husk Ash (RHA); Unconfined Compressive Strength (UCS).