The Comparison between the Strength of Stabilized Cement Clay Columns and Remolded Cement Clay Samples
The addition of a stabilizer i.e. cement or lime changes the clay particles in the clayey soils. Instead of the plate-like or flaky shape of particles, the formation of CSH or CAH cluster which has spider or hairy cluster shapes (under scanning electron microscope) has created bonding which in...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English English |
| Published: |
INTI International University
2023
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| Subjects: | |
| Online Access: | http://eprints.intimal.edu.my/1906/ http://eprints.intimal.edu.my/1906/1/joit2023_36r.pdf http://eprints.intimal.edu.my/1906/2/344 |
| Summary: | The addition of a stabilizer i.e. cement or lime changes the clay particles in the
clayey soils. Instead of the plate-like or flaky shape of particles, the formation of CSH or
CAH cluster which has spider or hairy cluster shapes (under scanning electron microscope)
has created bonding which increased the shear strength of the stabilized soils significantly.
According to BS 1924, in preparing the soil samples for unconfined compression, the
stabilized soils need to be compacted to a certain degree of compaction utilizing dynamic
compaction. The author suggested that this dynamic compaction, without any measurement
regarding what was the energy amount being imposed on the stabilized soil samples, might
damage the CSH clusters or CSH matrix gel thus resulting in non-reliable results on the
strength of the laboratory-prepared specimens. This result also does not resemble the
strength developed in cement columns or lime columns in the field. The study is divided
into three major stages. The first was the preparation of samples for UCT based on BS 1924,
which were compacted using static packing pressure (SPp). Secondly is the development of
a small-scale physical model to study the undrained shear strength of the stabilized kaolinite.
Thirdly, the preparation of UCT samples compacted to a pre-determined packing pressure
(PPp). Pre-determined packing pressure is 50% of the (SPp). It was found that reducing 50%
of the (SPp) has reduced the strength of samples significantly. The strength of the samples
compacted to 100% SPp is approximately ten times higher than that of the uncompacted
cement column strength after 56 days of curing. The ionic conductivity trend shows that as
the strength increases, the conductivity value decreases. This finding has led to the
conclusion that electric or ionic conductivity tests can be applied as supporting tests in
predicting the strength development in cement-stabilized kaolinite. |
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