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| Titel |
Study on the Surface-Physicochemical-Property Changing of Bentonite by Adapting a New Soil Stabilizer |
| VerfasserIn |
Wei Huang, Wei Xiang, Linzhi Lang, Deshan Cui |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250104079
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| Publikation (Nr.) |
 EGU/EGU2015-3502.pdf |
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| Zusammenfassung |
| Surface-physicochemical-property of clays has been proved to have direct influence on its
mechanic behavior. Specific surface area (SSA) is one of the most important factors for
surface-physicochemical-property assessment. The smaller SSA tends higher strength (shear
strength, unconfined compressive strength and tensile strength) under different water contents
of soil.
In this paper, a new soil stabilizer (Tung oil-based sulfonated) is developed and applied to
improve the properties of Ca-bentonite. The differences of specific surface area, fractal
dimension and micro geometric morphology between raw Ca-bentonite samples and modified
ones are investigated based on the data acquired from water vapor, nitrogen adsorption
experiments and SEM experiments. Results show that the SSA including external SSA and
total SSA of treated samples decrease largely and apparently when compared to that of the
raw samples. Furthermore, the higher volume ratio between soil stabilizer and water, the
more decrease in SSA. Compared to the ones of raw Ca-bentonite, the external SSA and
total SSA of the modified Ca-bentonite samples decrease by 48.5% and 25.2%,
respectively, when the volume ratio was 1:50. This result implies that the connection
of montmorillonite particles becomes more tightly after the treatment by the soil
stabilizer.
In addition, an obvious decreasing trend is found in fractal dimension by analysis of water
vapor adsorption isotherms. This finding indicates that the pore surface tends to be smoother
by the chemical action among particles bonds, more condensable in aggregates
and shorter space between the interlayer of montmorillonite. SEM results display
that the new soil stabilizer developed a quantity of lamellar aggregates but did not
change the structure of montmorillonite. Based on all mentioned above, the results of
fractal dimension analysis are verified. Consequently, this study shows that the new
soil stabilizer (Tung oil-based sulfonated) has obvious effects on improving the
physicochemical properties of bentonite. The findings of this study further indicate that
the mechanic behavior of bentonite could be improved by adapting this new soil
stabilizer.
Keywords: new soil stabilizer; tung oil-based sulfonated; Ca-bentonite; specific surface
area; fractal dimension; SEM |
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