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Methylene Blue Surface Area Method to Correlate with Specific Soil Properties

Sivapullaiah, PV and Prasad, B Gurit and Allam, MM (2008) Methylene Blue Surface Area Method to Correlate with Specific Soil Properties. In: GEOTECHNICAL TESTING JOURNAL, 31 (6). pp. 503-512.

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Specific surface area (SSA) of soils is calculated by determining the amount of adsorbed substance such as methylene blue (MB), ethylene glycol monoehtyl ether (EGME), or water required to form a monolayer. Free swell index and liquid limit of soils, which are well correlated with each other, and with engineering properties of soils, can be used to check the relative advantage of determination of a specific area by different methods in geotechnical engineering. The water adsorption method yields different values depending on the relative humidity (RH) at which the soils are equilibrated with water and gives significantly high adsorption values at 100 % RH. The water adsorption method, comparatively simpler, gives more accurate values for kaolinitc soils but generally has lower values for soils with montmorillonitic mineral owing to insufficient saturation of exchangeable ions. The SSA values obtained by EMGE correlates reasonably well with free swell index. Improved correlation is observed in specific surface area values obtained by MB methods. The SSA values obtained by methylene blue titration (MBT) or as methylene blue spot method (MBS) are comparable.

Item Type: Journal Article
Publisher: ASTM International
Additional Information: Copyright of this article belongs to ASTM International.
Keywords: methylene blue;ethylene glycol monoethyl ether;water adsorption;specific surface area;free swell index; liquid limit.
Department/Centre: Division of Mechanical Sciences > Civil Engineering
Date Deposited: 15 Sep 2009 09:56
Last Modified: 15 Sep 2009 09:56
URI: http://eprints.iisc.ac.in/id/eprint/17570

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