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Title

Smectite quantification in sediments and soils by thermogravimetric analyses

AuthorsNieto, F.; Abad, Isabel; Azañón, José Miguel CSIC ORCID
KeywordsSwelling–shrinking processes
Expansive clays
Weight loss
Ethylene glycol
Engineering
Landslides
Issue DateFeb-2008
PublisherElsevier
CitationApplied Clay Science 38(3-4): 288-296 (2008)
AbstractA new method is assayed, consisting in measuring the weight loss between 100 and 450 °C of samples solvated with ethylene glycol and previously saturated in Mg. This approach allows an approximation to be made of the dioctahedral Al-rich smectite content in samples. The proportion of expandable material in the sample is calculated according to the following equation, obtained from artificial mixtures prepared with variable proportions of smectite: y = 3.96x − 4.05 (R2 = 0.96), where x is the percentage of loss and y is the percentage of smectite in the sample. The slope of the equation agrees perfectly with the theoretical proportion of ethylene glycol in a solvated smectite, around 25%, and with the equivalent values determined on natural standards. In addition, the ordinate of the origin is also in agreement with the values of around 1% obtained in smectite-free samples. The method proposed is low-cost and easy to apply as a complement to X-ray diffraction determinations of expandable clay content in sediments and soils with the potential for landslides in civil engineering.
Description9 pages, 5 tables, 4 figures.
Publisher version (URL)http://dx.doi.org/10.1016/j.clay.2007.04.001
URIhttp://hdl.handle.net/10261/18404
DOI10.1016/j.clay.2007.04.001
ISSN0167-7187
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