Thursday, February 15, 2018

New M.Tech. Thesis Submitted from civil

POSSIBILITY OF RTW & CDW IN STONE COLUMN TO IMPROVE BEARING CAPACITY OF CLAYEY SOIL by Gagandeep Singh 

Abstract
The foundation is the main part for any structure in Civil Engineering which rests on the soil, so ultimately all the load of the structure transfers to the ground. The soil under the foundation should have safe bearing capacity, so that soil beneath the foundation should not fail. As the construction of the superstructure mainly depend upon foundations of that structure, whole structure has been erected on the soil of suitable bearing capacity. But the value of bearing capacity decides the amount of improvement to be done. The improvement may be done by use of piles, piers, caissons and stone columns. Material to be used in stone column are aggregates up to size 100mm. Waste materials generated such as Rubber and Concrete demolition waste can be used as replacement of aggregates. In this present study clay of medium plasticity (CI) used was collected from village lohatbaddi, district Ludhiana (PB). Concrete demolition waste (CDW) was collected from waste of cubes tested in concrete laboratory. Rubber tyre waste (RTW) in crumbed powder form was collected from Speedways tyre industry, Transport Nagar, Ludhiana. In this study an attempt was made to use CDW and RTW in improving bearing capacity of the soil. The percentage of RTW: CDW (0:100, 20:80, 40:60, 60:40, 80:20, 100:0) was used in this present study. The optimized value of RTW: CDW ratio for single column is (20:80) and optimized L/D ratio of column is 6. Then this percentage was used for L/D ratios 3, 6 & 10 for the number of columns 1,2,3,4&5.The allowable bearing capacity for L/D ratio 6 is more than for L/D ratio 3 & 10 and it was maximum for five number of columns. The allowable bearing capacity with five stone columns was 2-3 times the bearing capacity of soil without
stone columns.