Abstract
In recent years attention has been given to the acidification and alkalization of the soils to understand physico-chemical and Engineering properties. The effect of Sulphuric acid and Orthophosphoric acid with Calcium Carbonate and Magnesium Carbonate treated soils is studied. The Optimum percentages of CaCO3 and MgCO3 mix were found for Black Cotton soil and Red Earth based on compaction test. Liquid limit is decreased with CaCO3.and increased with MgCO3. Plastic limit is increased with CaCO3 and decreased with. MgCO3. Shrinkage limit is increased with CaCO3 and decreased with MgCO3. Acidification of alkalis treated soils by one normal Sulphuric acid and one normal Ortho Phosphoric acid showed alteration and impairment in index properties. However, the effect of 1N H3PO4 on the alkali treated soils has less negative effect than with 1N H2SO4 on the index properties. It is evident that the index properties of soils are altered when compared with their initial characteristics. The reasons for the observed behavior of soils are addressed.
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