10-04-2017, 08:56 PM
stabilisation of black cotton soil using bioenzymes for pavement construction ppt
Abstract
In developing countries like India the most important requirement of any project after performance criteria is its economical feasibility and serviceability criteria. The conventional methods are time consuming and are not economically feasible. Hence there is a need to discover the other possible ways to satisfy the performance as well as economical criteria. In this paper, popularly available bio-enzymes and their effect on engineering properties of soil are discussed. The stabilization of soil with bio-enzyme is a revolutionary technique which becoming popular worldwide. Recently there are many bio-enzymes available for soil stabilization such as renolith, Perma-Zyme, Terra-Zyme, Fujibeton etc. These enzymes have been proven to be very effective and economical. Another advantage of the bio-enzyme is that these are environment friendly. When these bio-enzymes are mixed with soil they alter its engineering properties. Their efficiency depends upon the amount of dose, type of soil available and field conditions. The use of bioenzyme in soil stabilization is not very popular due to lack of awareness between engineers and non availability of standardized data. However, recently some bio-enzyme stabilized roads were constructed in various parts of India, which are performing very well.
INTRODUCTION
The idea of using enzyme for stabilization in pavement construction was developed from the application of enzyme products used to treat soil in order to improve horticultural applications. A modification to the process produced a material, which was suitable for stabilization of poor ground
for road traffic. When added to a soil, the enzymes increased the wetting and bonding capacity of the soil particles .An enzyme is by definition an organic catalyst that speeds up a chemical reaction, that otherwise would happen at much slower rate, without becoming a part of the end product. Since the enzymes do not becomes the part of end product and are not consumed by the reaction, a very small amount of bio enzyme is required for soil stabilization. They are organic molecules that catalyze very specific chemical reactions if conditions are conducive to the reaction they facilitate. For an enzyme to be active in a soil, it must have mobility to reach at the reaction site. The pore fluid available in the soil mass \provides means for mobility of the molecules of bioenzyme, the specific soil chemistry provides the reaction site, and time is needed for the enzyme to diffuse to the reaction site. An enzyme would stay active in a soil until there are no more reactions to catalyze. Enzymes would be expected to be very soil specific