Jordan Journal of Civil Engineering

Effect of Rice Husk Ash and Stone Dust on Selecting Engineering Properties of Poor Subgrade Soil


Ayush Mittal;


Roads are one of the major contributing factors for the economic and social enhancement of any country. Its importance further increases if the economy of a country is based on agriculture. From the total land area of India, more than 20% is covered with soils having high swelling and shrinkage potential and low strength. Any type of construction over such soils will not last long due to subsidence and crack formation. So, in order to overcome such situations, some soil stabilization techniques have to be adopted, since removal and replacement will lead to heavy economic burden. This paper presents the effect of adding rice husk ash (RHA) and stone dust on various index and engineering properties of weak soil. Various doses of RHA (5, 10 and 20%) along with 6% cement and stone dust (10, 20, 30 and 40%) are used for stabilization. Tests are carried out to determine consistency limits, specific gravity, differential free swell, compaction characteristics and soaked California Bearing Ratio (CBR). Test results indicated significant reduction in swelling potential and improvement in CBR value of soil, thus decreasing the thickness requirement of pavement and saving costly base and sub-base aggregate materials.


Rice husk ash, Stone dust, Subgrade, Expansive soil, Pavement