Experimental Study on California Bearing Ratio of Expansive Soil with Waste Concrete and Rice Husk Ash

Abstract

Expansive soil covers about one-fifth of the total area of India, particularly in the states of Gujarat, Maharashtra, Madhya Pradesh, Karnataka, Rajasthan, Andhra Pradesh. Expansive soils are residually derived from the gneiss, basalt, basic volcanic ash, calcarious aluminum and sedimentary rocks containing calcarious shales, lime stones, slates and sand stones. The underlying bedrock of black cotton soil to a large extent is basaltic or traps. Black cotton soil forms due to the sub aerial weathering of the basalts in-situ and subsequent admixture of the weathered products with iron and organic matter. Expansive cohesive soils associated with so many problems as volume shrinkage, expansivity, low CBR value, Swelling Index etc. In this research paper result CBR value of Expansive cohesive soil use concrete waste. This material constitutes approximately 40% of concrete volume. The substitute material that comes to mind first is soil stabilization. Demolished concrete contributes the largest share of this waste material, and another waste product Rice husk is an agro-waste material, which is produced in about 300 million metric tons in world wide annually. Approximately, Rice husks contain organic substances and 20% of inorganic material. RHA contains a high amount of silicon dioxide, and its reactivity related to lime depends on a combination of two factors, namely the non-crystalline silica content and its specific surface.

Keywords: Rice Husk Ash (RHA), Concrete Waste (CW), Expansive cohesive soil (EXPANSIVE SOIL), Maximum Dry Density (MDD), Optimum Moisture Content (OMC) and CBR test