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Effect of Pozzolonic Process on The Strength of Stabilized Lime Clay
Hafez M. A., Sidek, N. and Md. Noor M.J. Faculty of Civil Engineering, Universiti Teknologi MARA |
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ABSTRACT |
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Effect of Pozzolonic Process on The Strength of Stabilized Lime Clay
Hafez M. A., Sidek, N. and Md. Noor M.J. Faculty of Civil Engineering, Universiti Teknologi MARA |
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ABSTRACT |
The objective of this study was to compare the performance of strength in small model of deep soft lime stabilized clay with a comparable remolded sample. At the same time, we investigated the relationship between production rate of pozzolonic material and its impact on developing strength. Two trial phases were conducted using kaolin as a row material. The first try was carried out under amount of standard packing pressure (SPp) which is enough to form a 50x100mm remolded sample. The second try was conduced under 50% of SPp. Sampled of the small model, the 100% SPP and the 50%SPP were crushed at curing time of 7, 28 and 56 days. There were six samples for each different dosage of additive ranging between 6% and 24%. Also, a scaled field model comparable to the in situ condition was created to determine the undrained shear strength in order to associate with the remolded sample using the same stabilized soft clay. The model consist of 8 columns, 100mm in diameter and was installed in 1.1 meter drum. Columns with different dosage of additive were pull out for testing after 28, 56, 90 and 120 day curing period. It was found that, stabilized soft clay in long term duration would create the particle interaction due to physicochemical changes in the sample. Also increasing the additive dosage will increase the strength in lime stabilization. The results obtained for the 56 day curing period showed similar pattern to that of 28 day curing period. The pattern of strength development in Stabilized Lime Clay Column showed reverse relationship to conductivity test results. The higher the strength, the lower the conductivity value. It is concluded that, the increment in the strength is related to the increment of lime percentage and the applied packing pressure during the preparation of the remolded sample plays an important role in developing strength and changing its micro-structural. Also, addition of lime above the Optimum Lime Content were effected the existing CSH and CAH.
Keywords: Lime stabilizes clay, Pozzolonic process, Packing pressure, Chemical stabilization, Ionic Conductivity
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