Some mechanical and chemical properties of cement stabilized Malaysian soft clay
Soft clays are defined as cohesive soil whose water content is higher than its liquid limits. Materials such as these display extremely low yield stresses, high compressibility, low strength, low permeability and consequently low quality for construction. Thus, soil-cement mixing is adopted to...
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| Format: | Thesis |
| Language: | English English English |
| Published: |
2008
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| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/7327/1/24p%20HO%20MEEI%20HOAN.pdf http://eprints.uthm.edu.my/7327/2/HO%20MEEI%20HOAN%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/7327/3/HO%20MEEI%20HOAN%20WATERMARK.pdf |
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| Summary: | Soft clays are defined as cohesive soil whose water content is higher than its liquid
limits. Materials such as these display extremely low yield stresses, high
compressibility, low strength, low permeability and consequently low quality for
construction. Thus, soil-cement mixing is adopted to improve the ground conditions
by enhancing the strength and deformation characteristics of the soft clays. For the
above mentioned reasons, a series oflaboratory tests were carried out to study some
fundamental mechanical and chemical properties of cement stabilized soft clay. The
test specimens were prepared by varying the portion of ordinary Portland cement to
the soft clay sample retrieved from the test site of RECESS (Research Centre for Soft
Soil) at UTHM. Comparisons were made for both mechanical and chemical
properties by relating the effects of cement stabilized clay of homogeneous and
columnar system specimens for 0,5 and 10 % cement and curing for 3, 28 and 56
days. The mechanical properties examined included one-dimensional compressibility
and undrained shear strength, while the chemical properties included pH values and
the percentage of oxide concentration. For the mechanical properties, both
homogeneous and columnar system specimens were prepared to examine the effect
of different cement contents and curing periods on the stabilized soil. The one�dimensional compressibility test was conducted using an oedometer, while a direct
shear box was used for measuring the undrained shear strength. Chemical properties
of the stabilized material were examined using the X-Ray Fluorescence (XRF)
method to obtain the percentage of oxide concentration while a pH meter was used to
determine the pH values. The chemical study was also to ascertain the extent of
leaching effect from the stabilized column to the surrounding soils. The higher the
value of cement content, the greater is the enhancement of the yield stress and the
decrease of compression index. The value of cement content in a specimen is a more
vi
active parameter than the curing period. It can be proposed the following relationship
for RECESS soft clay from this study: cry' = 1.5871 <. The chemical results showed
that cement-stabilized column give environmental effects to the soil surrounding the
column. The pH values for cement content of 5 % and 10 % in the soil-cement
column specimens gradually decreases with the curing days for both consolidated
and without consolidated specimens. Soil-cement column specimen with
consolidation gave a higher pH compare to the specimens without consolidation.
Major to minor relative values ofthe percentage of oxide concentrations are Si02 >
Ah03> Fe203 > S03 > K20 > CaO. |
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