Consistency Characteristics of Dispersive Clays
Engineering and Technology Journal,
2021, Volume 39, Issue 12, Pages 1753-1759
AbstractDispersive soils are characterized by three features: (1) unstable structure, (2) they are readily flocculate in water, and (3) very erodible. The use of dispersed clay soils in hydraulic structures, dams and road dams can cause serious engineering problems when this soil is not identified and used befittingly. There is a simple way to determine soil dispersion and more difficult to measure dispersion. (Atterberg’slimits) (grain size analysis), and (visible classification) are not enough to recognize between (normal clays) and (dispersive clays).ASTM tests can identify dispersive clay, these include: (double hydrometer test), (chemical tests), (Crumb test), and (Pinhole test). In this paper, the dispersed soil has been artificially prepared by adding Na2CO3 to natural clay in different proportions. The proportions are 5%, 15%, 25%, 30%, 35%, and 40% by weight. The target of this investigation is to investigate the effect of degree of dispersion of the soil on Atterberg limits. The study showed that the percentage of dispersion increases with Atterberg’slimits and the dispersion ratio and the plasticity index relationship are related by a direct relationship.
- A dispersed soil has been artificially prepared by adding Na2CO3 to natural clay in different proportions.
- The proportions are as follows 5%, 15%, 25%, 30%, 35%, and 40% by weight.
- The target of this investigation is to investigate the effect of degree of dispersion of the soil on Atterberg limits.
- The study showed that the percentage of dispersion increases with Atterberg’s limits.
 R.Fell,P.MacGregor,D.Stapledon, M. Foster, Geotechnical engineering of embankment dams, second edition, Taylor & Francis Group,London,UK.(2015)
 F.Rosquoët, F.Bendahmane, D.Marot, and A.Alexis, Experimental Characterization of internal erosion on sandy clay samples 23rd Academic Symposium of Civil Eng.(2005).
 T. S.Umesha, S. V. Dinesh, and P. V. Sivapullaiah, Characterization of dispersive soils, Materials Sciences and Applications 2, 2011,629-633.
 T. G. Forrest, Engineering and design - Laboratory soils testing, Appendix XIII: Pinhole erosion test for identification of dispersive clays Dep. of Tee army, Washington, U.S.A,(1980).
 C. H. McElroy, Using hydrated lime to control erosion of dispersive clays, Lime for Environmental Uses. Gutschich K G. ASTM STP, 931, 1987,100-114.
 R.Anon, Effects of sodicity and salinity on soil structure, SOILpak for dryland farmers on the red soil of Central Western NSW, NSW Dept. Primary Industry,(1999).
 M. Y.Fattah, N. M. Salim, E. J.Irshayyid, Experimental Study on Compressibility, Volume Changes, Strength and Permeability Characteristics of Unsaturated Bentonite-Sand Mixtures, Eng. and Tech. Journal, Univ. of Technology – Iraq, 34 , (A), 7, 2016, 1308-1323.
 M.Hamoodi, Filter Requirements for cohesive soil used in earth dams,(1996).
 A.Habibnia,G.Rahimipour, &H.Ranjbar, Equivalence assessment and leveling of geochemical datasets to generate integrated geochemical maps: Application to mineral exploration. Journal of Geochemical Exploration, 212, 2020,106507.
 M. Y. Fattah,H. A. Omran,T. M.Abdulatif, Modification of Pinhole Apparatus for Identification and Classification of Dispersive Clay Soils, Journal of Eng. and Dev., Uni. of Al-Mustansiriya, 18, 6, 2014, 2014, 181-201.
 S. Vyas,N.Phougat,P. Sharma, and M. Ratnam, Stabilization of dispersive soil by blending polymers, International Journal of Earth Sciences and Eng., 04, 06 SPL, 2011, 52-54.
 ASTM D4221 - 18 Standard Test Method for Dispersive Characteristics of Clay Soil by Double Hydrometer, American Society for Testing and Materials (ASTM).
 ASTM D 854, Standard Test Method for Specific Gravity, American Society for Testing and Materials (ASTM).
 ASTM D 4318, Standard Test Method for Liquid Limit, Plastic Limit, and Plasticity Index of Soil, American Society for Testing and Materials (ASTM).
 ASTM D 422, Standard Test Method for Particle Size Analysis of Soils, American Society for Testing and Materials (ASTM).
 ASTM D2487, Standard Test Method for Classification of Soils for Engineering Purposes (Unified Soil Classification System), American Society for Testing and Materials (ASTM).
 ASTM D698, Standard Test Methods for Laboratory Compaction Characteristics of Soil Using Standard Effort. ASTM International, West Conshohocken, PA.
 British Standards, BS: 8004, Code of Practice for Foundation, Standards Institution, London, (2004).
 M. Y.Fattah, M. Th. Al-Hadidi,B. A Ali, Optimization of the Time Required for Determination of the Total Dissolved Salts in Soil, Eng. and Tech. Journal,32 ,(A), 13, 2014,3272-3283, Special issue on the 1st International Scientific Conference on Environment and Sustainble Development (ISCESD 2013), 29-30 Dec, 2013.
 H. H Bakir, F. H. Rahil, M. Y.Fattah, M. A. Al-Neami, Effect of Soil Consistency of Cohesive Soils on Flow Characteristics of Acids, Eng. and Tech. Journal, University of Technology, 26, 10, 2008,1185-1200.
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