EFFICACY OF SODIUM CARBONATE AND CALCIUM CARBONATE IN STABILIZING A BLACK COTTON SOIL
The problem of damage to structures in expansive soils is world wide. These soils are very often referred as black cotton soils. The properties of black cotton soil may be improved to make the soil suitable for construction purposes. There are several techniques to improve the soil properties like sand cushions, CNS layer techniques, sand columns, stone columns, vibration techniques and by adding chemicals etc. Among these, chemical stabilizing is more expensive than other types of stabilization methods. But the main advantage of it is that setting time and curing time can be controlled. The efficacy of sodium carbonate and calcium carbonate is stabilizing a black cotton soil is presented in this paper. The efficacy of calcium carbonate is much better than sodium carbonate from strength and stability point of view.
CHARACTERIZATION OF CEMENT KILN DUST STABILIZED BLACK COTTON SOIL
Cement kiln dust (CKD), being a waste product from cement industry is explored in the present study as a stabilizing material for black cotton soil(BC soil). In the present study, characterization of BC soil for Atterberg’s limits, Specific gravity, pH, compaction characteristics and unconfined compressive strength were conducted by admixing with CKD at different percentage. The results of the present study indicates that, both liquid limit and plastic limit increases with increase in CKD percentage. It was found that UCS increases with increase in curing period for BC soil admixed with 12%CKD. It was concluded that 12% CKD produce optimum benefits in terms of reduction in plasticity and increase in strength of BC soil admixed with CKD. CKD being an industrial waste thus can be used to stabilize BC soils to improve its engineering performance as a stabilized material.
Naturally cemented sensitive soils
Many extremely sensitive or quick clay soils, particularly but not only those found in Canada, show characteristics of natural cementation bonding between particles. These soils include not only th...