This book investigates the suitability of stabilized Expansive soil as construction material in Civil and Geo-environmental engineering applications using the Eko soil enzyme. The expansive soil was stabilized with Eko soil enzyme alone and in combination with Fly ash. The dosage of Eko soil enzyme was maintained at a range varied from 2% to 6% and that of Fly ash at 10% to 50% of the dry weight of Expansive soil. Before the main tests, the basic index and engineering properties of the expansive soil which form the backbone of this research work were studied and these properties were referred...