Analytical and Laboratory Evaluation of the Solubility of Gypsiferous Soils
Abstract: Gypsum soil is one
of the problematic soils because of considerable solubility for Gypsum
particles in contact with water. In this research the effects of three factors
including; gypsum percent, hydraulic gradient and soil texture were studied on
solubility of gypsum soils. To do this, samples of gypsum soils were provided artificially
by adding various rates of natural gypsum rock including 0, 5, 10, 20 and 30
percent weight of 3 kinds of soil textures including clay, silty clay and sand.
Totally, 15 types of gypsum soils were prepared. Then each of gypsum soils were
leached under five hydraulic gradients levels 0.5, 1, 2, 5 and 10. The results
of the test indicated that the rate of Gypsum in the soil had direct effect on
the rate of soluble and by increasing the percent of Gypsum, the rate of
solubility was increased. In addition, by increasing hydraulic gradient, the
speed of water existing soil media in a specified time was increased and also
higher rate of Gypsum was derived. Also the soil texture has a considerable
effect on the rate of solubility of soil. In this study, rate of solubility of
gypsum soils with sandy soils was determined as 1.5 to 2 times more than the
rate of clay soils. The
statistical results show the
highest impact of gypsum percentage and lowest impact of hydraulic gradient
soil on solubility of particles in different types of soils and it has no
significant effect on the overall equation of the soil texture.
Author: Aliabbas Afsharian,
Nader Abbasi, Amir Khoserowjerdi, Hossein Sedghi
Journal Code: jptsipilgg160053
