Effect of Using Ion Exchange Solution in Increasing Bearing Capacity of Clayey Soils with Various Plasticity Index (PI)

Document Type : Research Article

Authors

Civil Engineering Department, Imam Khomeini International University, Qazvin, Iran

Abstract

So far, at the most of executive project in Iran, using CBR+4 ion stabilizer solution is a chemical ion-exchange experiments. The necessity of present study is the investigation about the characteristics of strength behavior of clayey soils with various PI stabilized by this method. The performance of stabilized soil samples by“CBR+4” ion-exchange solution in wetting-drying and freeze-thaw cycles also been studied for the first time in this study. In soil stabilization with CBR+4 solution Firstly, according to the amount of soils ion exchange, which is determined by a laboratory chemical test, the required amount of the stabilizer is determined. Then, At the most of executive project in Iran, using Tetrabromomethane (CBR+4) ion stabilizer
solution is a chemical ion-exchange experiments. The necessity of present study is the investigation
about the characteristics of strength behavior of clayey soils with various plasticity index (PI) stabilized
by this method. The performance of stabilized soil samples by CBR+4 ion-exchange solution in wettingdrying
and freeze-thaw cycles also been studied for the first time in this study. Firstly, in soil stabilization
with CBR+4 solution the required amount of the stabilizer is determined, according to the amount of
soils ion exchange, which is determined by a laboratory chemical test. Then, the samples are built in
their optimum moisture content and maximum dry densities and after curing the samples for two weeks,
dry samples are tested. Soils samples are also tested in saturated condition after two weeks curing time.
Saturated samples showed more increase in strength compared to dry samples. Stabilized soil sample
are also tested under 1 to 4 freeze-thaw and wetting-drying cycles. Tests results showed that using
CBR+4 stabilizer increase bearing capacity of clayey soils. This increase is higher in soils with lower
PI. Although freeze-thaw and wetting-drying cycles reduce soils bearing capacity, their strength are
significantly more than the un-stabilized samples and is acceptable.

Keywords

Main Subjects

References

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Amirkabir Journal of Civil Engineering
Volume 49, Issue 2
August 2017
Pages 305-312

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