Improved strength and reduced permeability of stabilized peat: Focus on application of kaolin as a pozzolanic additive

Wong, L.S. and Hashim, R. and Ali, F. (2013) Improved strength and reduced permeability of stabilized peat: Focus on application of kaolin as a pozzolanic additive. Construction and Building Materials, 40. pp. 783-792. ISSN 09500618

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The aim of this work is to demonstrate the application of kaolin as a pozzolanic additive of stabilized peat. In addition to kaolin, Portland composite cement, calcium chloride and silica sand were used as the materials to stabilize the peat. To achieve such aim, test specimens of both untreated and stabilized peats were tested in laboratory in order to evaluate its unconfined compressive strength and rate of permeability. Each test specimen was prepared in such a way that it has to simulate the in situ condition of deep peat stabilization by deep mixing method. It was found that test specimen with 10 partial replacement with kaolin has the highest unconfined compressive strength that exceeds the minimal required unconfined compressive strength of 345 kPa. The test specimen was subjected to 100 kPa initial pressure and cured in water for 7 days. The unconfined compressive strength of the test specimen was discovered to be 33.7 times greater than that of untreated peat specimen. In laboratory permeability tests, the rate of permeability of untreated peat was found to be 6.43 � 106 times higher than that of stabilized peat. Samples of the test specimens were examined using Energy Dispersive X-ray (EDX) and Scanning Electron Microscope (SEM). High peaks of calcium element from the EDX results of stabilized peat specimens imply that the specimens have high calcium composition as a result of cement hydrolysis, and addition of kaolin is believed to induce secondary pozzolanic reaction in which the cementation crystals of mainly calcium silicate hydrate were formed to bind the soil. Based on the observation of SEM of the stabilized peat specimens, it was found that there was a significant pore refinement in the test specimens as a result of the filler effect of silica sand and pozzolanic activity of kaolin.

Item Type: Article
Additional Information: Export Date: 16 December 2013 Source: Scopus CODEN: CBUME Language of Original Document: English Correspondence Address: Wong, L.S.; Center for Sustainable Technology and Environment, College of Engineering, Universiti Tenaga Nasional, Km 7, Jalan Kajang-Puchong, 43009 Kajang, Selangor, Malaysia; email: References: Haq, A., Iqbal, Y., Khan, M.R., Historical development in the classification of kaolin subgroup (2008) J Pak Mater Soc, 2, pp. 44-49; Taggart, M.S., Miligan, W.O., Studer, H.P., Electron microscope studies of clays (1954) Clay Clay Miner, 3, pp. 31-95; Deer, W.A., Howie, R.A., Zussman, J., (1992) An Introduction to the Rock-forming Minerals, , 2nd ed. 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Uncontrolled Keywords: Kaolin, Peat, Portland composite cement, Silica sand, Calcium silicate hydrate, Composite cements, Deep mixing method, Energy dispersive x-ray, Filler effects, Initial pressure, Partial replacement, Permeability test, Pozzolanic activity, Pozzolanic additives, Reduced permeabilities, Secondary pozzolanic reaction, Situ conditions, Test specimens, Unconfined compressive strength, Calcium chloride, Compressive strength, Scanning electron microscopy, Silicate minerals, Soil cement, Testing
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Divisions: Faculty of Engineering
Depositing User: Mr Jenal S
Date Deposited: 10 Feb 2014 02:20
Last Modified: 10 Feb 2014 02:20

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