Methods for assessment and identification of dispersive soils

Djokovic, Ksenija; Čaki, Laslo; Nenad, Šušić; Hadži-Niković, Gordana

doi:10.1002/cepa.672

Cited by 7 publications

(2 citation statements)

References 3 publications

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“…Dispersive clay soils constitute a distinct group of fine-grained soils that provide challenges in their identification using visual categorization or physical examination techniques, such as consistency tests and particle size analysis [14]. The crumb and double hydrometer tests are well recognized as straightforward and preliminary techniques for evaluating the dispersive characteristics of soil.…”

Section: Introductionmentioning

confidence: 99%

The potential of NAA and ICP-MS for determining soil dispersibility in relation to landslide incidents

Shah,

Zali,

Nazer

et al. 2024

IOP Conf. Ser.: Mater. Sci. Eng.

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Dispersive soils pose significant challenges due to their inherent tendency to rapidly respond to the presence of water, resulting in erosion and heightened susceptibility to landslides. The inclusion of sodium (Na) onto the surface of soil clay particles results in the attenuation of the electrochemical interactions between the dispersed soil, leading to the repulsion and subsequent migration of the clay particles away from one another. This study employed Neutron Activation Analysis (NAA) and Inductively Coupled Plasma Mass Spectrometry (ICP-MS) to assess the Sodium Adsorption Ratio (SAR) and Exchangeable Sodium Percentage (ESP) as indicators of soil dispersibility. The results indicate that soils containing montmorillonite clay mineral exhibit greater values of SAR > 11 and ESP > 20 in comparison to soils containing other clay minerals i.e. kaolinite, illite, and vermiculite. The calculated SAR and ESP values obtained from both analyses demonstrate a notable agreement, indicating a positive correlation. In conclusion, it is apparent that both NAA and ICP-MS method has the capability to be applied for the purpose of predicting soil dispersibility in landslide-prone regions of Malaysia.

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Section: Introductionmentioning

confidence: 99%

The potential of NAA and ICP-MS for determining soil dispersibility in relation to landslide incidents

Shah,

Zali,

Nazer

et al. 2024

IOP Conf. Ser.: Mater. Sci. Eng.

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“…In this regards, during past decades, many researchers studied identification methods of dispersivity of soils using chemical or physical properties of soils (e.g. [3][4][5][6][7][8][9]). Among the common tests to identify dispersivity of soils are soil dispersion test (in jar), pinhole test, double hydrometer test, and chemical tests [10].…”

Section: Introductionmentioning

confidence: 99%

Assessing Dispersivity and Expansivity of Clay Soils in the South-East of Yazd with Aim of Investigating Correlation between Them

Zare-Junaghani

Mehrnahad

Torabi-Kaveh

2019

Period. Polytech. Civil Eng.

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Having knowledge about physical, chemical and mechanical properties of problematic soils is necessary when they are applied in construction projects as borrow materials or foundation, because these soils have potential to create large financial losses. This research deals with characterizing dispersive and swelling soils as problematic soils in southeast of Yazd (center of Iran) with aim of establishing a relationship between dispersivity and expansivity indices. In this regard, after performing a series of physical and chemical tests, the characteristics of the soil samples were determined, and their dispersivity degrees were specified by conducting chemical, pinhole and double hydrometer tests. Also, swelling rates of the soils were estimated using direct method (modified free swell index, MFSI) and indirect methods (different criteria developed for swelling assessment). The results showed that chemical parameters overestimate dispersivity of the soil samples (dispersive to semi-dispersive) in compared to pinhole and double hydrometer tests (slightly non-dispersive to moderately dispersive). Different expansivity degrees were defined using the direct and the indirect methods (ignorable to very high) for the soil samples. Among the empirical criteria used to evaluate the swelling potential, the AASHTO's criterion has the closest results to the MFSI in the both boreholes. Also, it revealed that as depth increases, the degree of soil dispersivity and expansivity decrease in response to the reduction of fine grain content in the samples. Finally, the correlations between dispersivity and expansivity indices, showed that sodium absorption ratio (SAR) can be used as a reasonable index to estimate soil swelling potential.

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