Durability effect on stabilized subgrade soil
Soft clay soil can be categorized as a problematic soil as it has the low strength and high compressibility characteristics. In any highway construction on a soft clay soil, sub-grade soil stabilization is one of the important processes. Therefore, a careful design analysis should be taken for th...
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| Format: | Thesis |
| Language: | English English |
| Published: |
2014
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| Subjects: | |
| Online Access: | http://ir.unimas.my/id/eprint/9306/1/Durability%20Effect%20on%20Stabilized%20Subgrade%20Soil%2824pages%29.pdf http://ir.unimas.my/id/eprint/9306/8/Noraida%20%20Razali%20ft.pdf |
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| Summary: | Soft clay soil can be categorized as a problematic soil as it has the low
strength and high compressibility characteristics. In any highway construction on a
soft clay soil, sub-grade soil stabilization is one of the important processes.
Therefore, a careful design analysis should be taken for the purposes of any
structure built on it. In Sarawak, problematic soils, namely peat, silt and soft clay
are the major concern which is inadequate for sub-grade used in the construction of
a pavement structure. The focus of this study was mainly the strength and
durability of the silty clayey soil. The samples were collected from Kota
Samarahan, Sarawak and admixed with cement, fly ash and rubberchip as an
additive. The optimum mixture determine from the laboratory is then used as a
recommendation for design guideline of sub-grade based on JKR Standard
Specification for Road Works and the calculation are performed by using MathCad
software. In this study, the stabilized clay specimens were prepared with 5%
cement and various fly ash and rubber chips contents, of 5%, 10% and 15%,
respectively. The specimens were cured for 7 and 28 days before subjected to
Unconfined Compressive Strength (UCS) tests and California Bearing Ratio (CBR)
tests. As observed, the stabilization improved the strength and stiffness of the soil
properties significantly. However, the addition of 15% rubberchip shows a
reduction in strength for both 7 and 28 days curing period. The optimum mixture
which fulfilled the JKR Standard Specification was the mixture of 5% cement and
15% fly ash where the value of CBR is 82.6% while the UCS value is 941.69 kPa.
However, the mixture of 5% cement and 10% rubberchip can also be used as an
alternative to stabilize the sub-grade for low volume road as the CBR value is
higher than 30% CBR required by JKR which is 64.66% while the UCS value was
771.77 kPa, respectively. |
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