STABILISATION OF CLAYEY SOIL USING CALCIUM CARBIDE RESIDUE AND FLY ASH
by Maninder Singh
The investigational study was done to improve the soil properties by using waste material, which is responsible for poisonous environment. Soil Stabilization is a general term for any chemical, physical, biological, or combined method of changing a natural soil to meet an engineering purpose. In the study, waste products like Calcium Carbide Residue (CCR) a by-product of acetylene gas factories and Fly Ash produced from thermal plant were added in a week soil sample in varying ratios. The dose of FA was taken as 15%, 20% & 25% and Calcium Carbide Residue (CCR) used was in ratio 1%, 3%, 5%, 7% & 9% by weight of soil. The study was carried out with a view to utilize waste material as construction of road embankment, earth slope or in filling of low lying area. The week soil may be utilized along with these materials as due to pozzolanic action, the strength of week soil is improved upto desirable load. The tests conducted on soil were Modified Proctor Test, CBR & UCS. Various concentrations of CCR (1%, 3%, 5%, 7% & 9%) along with different proportion of Fly Ash (15%, 20% and 25%) were added to soil to check compaction characteristics, California Bearing Ratio (CBR) and Unconfined Compressive Strength (UCS). CBR and UCS values increased with increase in dose of Fly Ash up to 20% and afterward it decreased. Therefore, optimum dose of FA was taken as 20%. CBR and UCS were further improved by blending CCR in a mix of soil and 20% FA. The CBR and UCS value increases by adding 20% Fly Ash and 7% Calcium Carbide Residue (CCR) by weight of soil and was defined as an optimum dose.