Performance Evaluation of Expansive Soil Treated with MICP and Industrial Waste Materials
摘要
Black cotton soil (BCS) is found in many parts of the world and is considered to be problematic due to its expansive nature. Therefore, a suitable soil stabilization technique or some effective method is needed to mitigate the ill effects of BCS on structures. Researchers have demonstrated that a variety of methods based upon mechanical, biological, or chemical stabilization can reduce the swelling-shrinkage nature and improve the strength behavior of expansive soils. In the recent years, Microbial-Induced Calcium Carbonate Precipitation (MICP) has emerged as a potential method for stabilizing different types of soils. MICP involves the use of bacteria that promote the precipitation of calcium carbonate within the soil matrix, resulting in improved soil strength and reduced volume changes. Considering the rapid growth of industrialization on the other hand, it is being encouraged for the bulk utilization of different industrial wastes in construction sectors. The combination of industrial waste and chemical stabilizers such as red mud, GGBS, fly ash, silica fume and bio-enzyme such as terrazyme, with the help of MICP technique can be very useful in further improving the engineering properties of soils as per project requirements. In the present study, Standard Proctor Test and Unconfined Compression Test on stabilized soil with different industrial wastes along with the indigenous bacteria via MICP technique are studied. It was found that the individual effect of industrial waste on UCS is less than that of treated with the indigenous bacteria. This will help to develop further roadmap for the effective use of MICP technique in stabilization of soil with different industrial wastes for various geotechnical applications.