CHARACTERISTICS OF GYPSIES SOILS TREATED WITH CALCIUM CHLORIDE SOLUTION
Main Article Content
Abstract
Gypseous Soils are distributed in many regions in the world including Iraq, which cover about (31.7%) of the surface area of the country. Existence of these soils, some times with high gypsum content, caused difficult problems to the buildings and strategic projects due to dissolution and leaching of the gypsum slates by the action of water flow through the soil mass. In this study the effect of treatment with Dihydrate Calcium Chloride (CaCl2.2H2O) as water solution on compaction, compressibility, leaching, permeability and shear strength characteristics of Gypseous soil is investigated. It is found that the maximum dry unit weight increases while optimum moisture content decreases with the increase in the concentration of calcium chloride in the molding water. It is concluded that the engineering properties of the samples are highly improved when the samples are soaked in calcium chloride solution at (20%) concentration. Where, considerable reduction is observed in compressibility, collapsibility, coefficient of permeability, percentage of
dissolved gypsum and leaching strain. Also, the treatment minimizes the reduction in cohesion component (c) upon soaking in water and slightly decreases the angle of internal friction (). Analysis of the tests results showed that the using of calcium chloride solution in improvement the gypseous soil is more efficient than using it in any other form (powder).
Article Details
How to Cite
Publication Dates
References
Al-Beiruty, M.Z.A. (2003): “Collapse Potential Determination of Gypseous Soil” M.Sc. Thesis, Civil Engineering Department, University of Baghdad.
Al-Busoda, B.S.Z. (1999): “Studies on the Behavior of Gypseous Soil and its Treatment During loading” M.Sc. Thesis, Civil Engineering Department, University of Baghdad.
Al-Khuzaie, H.M.A. (1985): “The Effect of Leaching on The Engineering Properties of Al-Jazirah Soil”, M.Sc. Thesis, Civil Engineering Department, University Of Mosul.
Al-Qaisee, G.S.H. (2001): “Leaching Collapse of Gypseous Soils”, M.Sc. Thesis, Civil Engineering Department, University of Baghdad.
Nafie, F.A. (1989): “The Properties of High Gypseous Soils and their Significant for Land Management”, Ph.D. Thesis, University of London.
Nashat, I.H. (1990): “Engineering Characteristics of Some Gypseous Soils in Iraq”, Ph.D. Thesis, Civil Engineering Department, University of Baghdad.
O’Flaherty, C.A. (1974): “Highway Engineering”, 2nd Edition, London.
Saaed, S.A. and Khorshid, N.N. (1989): “Some Essential Characteristics of the Gypseous Soils of Al-Dour Area”, Proceeding of the 5th Scientific Conference, Vol.4, part 2, Scientific Research Council, Baghdad.
Saleam, K., Al-Barazanji, A. and Wadei, B. (1986): “Effect of Type of Water on the Dissolution of Gypsum in Al-Dour”, Symposium on Gypsiferous Soils and Their Effect on Construction and Agriculture Production, Water and Soil Research Institute, Baghdad.
Seleam, S.N.M. (1988): “Geotechnical Characteristics of a Gypseous Sandy Soil Including the Effect of Contamination with Some Oil Products”, M.Sc. Thesis, Building and Construction Department, University of Technology, Baghdad.
Seidell, A. and Linke, W.E. (1958 ): “Solubilities, Inorganic and Metalorganic Compounds”, Vol.1, 4 th ed., American Chemical Society, D.Van Nostrand Co., Princeton, N.J.