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  1 - Analytical and laboratory evaluation of the solubility of gypsiferous soils
  aliabbas afsharian ناذر عباسی امیر خسروجردی حسین صدقی
  Gypsum soil is one of the problematic soils because of considerable solubility for gypsum particles in contactwith water. In this research, the effects of three factors including; gypsum percent, hydraulic gradient, and soiltexture were studied on solubility of gypsum s More

  Gypsum soil is one of the problematic soils because of considerable solubility for gypsum particles in contactwith water. In this research, the effects of three factors including; gypsum percent, hydraulic gradient, and soiltexture were studied on solubility of gypsum soils. To do this, samples of gypsum soils were provided artificiallyby adding various rates of natural gypsum rock including 0, 5, 10, 20 and 30 percent by weight of 3 kinds of soiltextures including clay, silty clay and sand. Totally, 15 types of gypsum soils were prepared. Then each ofgypsum soils were leached under five hydraulic gradients levels 0.5, 1, 2, 5 and 10. The results of the testindicated that the rate of gypsum in the soil has direct effect on the rate of soluble in a way that by increasingpercent of gypsum the rate of solubility was increased. in addition, by increasing hydraulic gradient, the speed ofwater outcome and its amount from soil environment in a specified time was increased and also more rate ofgypsum was derived. The statistical results show the highest impact of gypsum percentage and lowest impact ofhydraulic gradient soil on solubility of particles in different types of soils and it has no significant effect on theoverall equation of the soil texture. Manuscript profile