Gypsum Case Study

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Study on Behavior of Soil using Gypsum Abstract
There are several places in the world particularly middle East Asia and Africa has problem of gypsum contaminated soil known as gypsiferous soil. Gypsiferous soils cover approximately 100 million hectors in the world.
Gypsum not only dissolve in presence of water it also changes geotechnical properties of soil. In the current study effect of gypsum on Atterberg limits and compaction character tics of soil was studied.
Different percentage of gypsum was added with a soil from Raipur to simulate the conditions of Gypsiferous soil. Laboratory test were conducted to determine effect of gypsum content on liquid limit, plastic limit and compaction characteristics of soil. It was noted that with increase
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The origin of sulphate ions in the soil solution is in some circumstances due to the presence of sulphur-rich minerals such as pyrite in the parent material. By weathering and oxidation, the sulphur in these minerals is transformed into sulphuric acid which in calcareous soils reacts with CaCO3 to form gypsum.
On irrigated land, leaching of saline soils containing sulphate and calcium in the soil solution leads in some circumstances to the precipitation and accumulation of gypsum in the subsurface horizon.
The formation of gypsum may result from replacement of NaCl by CaSO4 when the irrigation water contains a substantial amount of calcium and sulphate. But it could be also a result of a partial leaching of salts from the soil because NaCl is much more soluble than CaSO4. It has been observed in the Euphrates Basin, that gypsum is recrystallized and redistributed in the soil profile after leaching of other, more soluble, salts.
Gypsiferous soils cover approximately 100 million hectors in the world (Verheye and Boyagiev, 1997). Gypsum not only dissolve in presence of water it also changes geotechnical properties of

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