Abstract
Dispersive 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.
Highlights
Dispersed soil is a main participate worker involved in the failure of pipes in dikes, especially small dikes that are without filtering, with bad build overseer ion [1]
In, the soil composition and the reaction between pore and corroding liquid at the roof is the property implicated in clay corrosion
In order to establish dependencies between dispersion and the degree of compaction, the pinhole tests were performed on samples with different degrees of compaction Rc: 90, 92, 95, 98, 100 and 102% compared to the compaction of the resulting standard Proctor compaction energy.Chemical test was performed in addition to the dispersion tests
Summary
Dispersed soil is a main participate worker involved in the failure of pipes in dikes, especially small dikes that are without filtering, with bad build overseer ion [1]. A specific type of soil is dispersed clay where part of the clay is corroding when water is present through the operation of breaking up pimplesinto fine grains, resulting adispersion[4] This soil erodes quickly and unexpectedly when there is water, even if the water flow is slow. In order to establish dependencies between dispersion and the degree of compaction, the pinhole tests were performed on samples with different degrees of compaction Rc: 90, 92, 95, 98, 100 and 102% compared to the compaction of the resulting standard Proctor compaction energy.Chemical test was performed in addition to the dispersion tests In this test, a sample of pore water is extracted from a saturated slurry of a soil sample and analyzed for cations. The dispersive clays are artificially prepared by adding different percentages ofsodumecarbonat Na2CO3 to the natural clay
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