Improvement in Plasticity and Strength Characteristics of Kuttanad Soil using Enzyme Induced Calcite Precipitation

Abstract: This work presents an inquiry into Enzyme Induced Calcite Precipitation (EICP) as a way for enhancing the engineering properties of highly plastic soil, in keeping with previous studies on eco-friendly ground improvement methods. The highly plastic soil samples were collected from Kuttanad, Alapuzha. In order to precipitate calcium carbonate (CaCO3) through urea hydrolysis, an equimolar mixture of cementation solution, consisting of urea and calcium chloride along with varying amounts of urease enzyme as catalyst, was added to the collected soil samples. The plasticity, strength, and microstructure of soils will be examined using a variety of tests, including the Atterberg limits test, Unconfined Compressive strength (UCC) testing, and Scanning Electron Microscopy (SEM) analysis. After EICP treatment and 7-day curing, the highly plastic soils showed a significant improvement in their plasticity and strength properties, as evidenced by a decrease in liquid limit and plasticity index, an increase in plastic limit, and a notable improvement in undrained shear strength. The results of the study proves that EICP can be used as an excellent treatment method th improve the plasticity and strength characteristics of highly plastic soils