Correlations of physical and chemical properties of eastern granitic soils of Peninsular Malaysia

Mohd Yusof, Khairul Nizar and Yusof, Mohd Fairus (2007) Correlations of physical and chemical properties of eastern granitic soils of Peninsular Malaysia. In: Persidangan Kebangsaan AWAM '07, 29-31 Mei 2007, Langkawi, Kedah.

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Abstract

climate conditions, high temperature and extreme distribution of rainfall expedite the formation of residual soils via chemical and physical weathering. Research on some of chemical composition, mineralogy and microstructure of residual soils, in spite of its important, is still lacking in Malaysia. Properties on mineralogy, microstructure and microfabric and chemical composition can be correlated to physical and engineering characteristics of residual soils. They can also be used in the design of structures placed on and in residual soils. The objective of this research is to determine some of the chemical composition, mineralogy and microstructure of granitic residual soil, as well as to form related correlation charts. The samples of granitic residual soils samples were obtained at various depths at Pulau Chondong, Kelantan in Peninsular Malaysia. The Scanning Electron Microscopy (SEM) and X-Ray Fluorescent (XRF) are used to analyze the mineralogy, microstructure and microfabric of granitic soils. The pH meter and Spectrophotometer are used in determining the chemical compositions and parameter of the residual soils. The results show that quartz and kaolinite are two major minerals present in the granitic residual soils while montmorillonite, illite and muscovite are the minor minerals. The presence of kaolinite minerals forms microfabric of flaky shape whereas quartz exists in granular form with clothed contacts. The study on microstructure of the residual soils show the existence of clay matrix with pH values of between 4.34 to 6.93, which indicate that the residual soils are acidic. The concentration of sulphate and chloride are in the range of 2.21 ppm to 17.58 ppm and 6 ppm to 75 ppm, respectively. The test results also show that the concentration of anion increases while the cation decreases with increasing distance from the surface of clay minerals. The values of cation exchange capacity (CEC) for the soil samples were found to be in the range 0.34 meq/100 g to 12.88 meq/100 g. The correlation between CEC vs pH values, loss on ignition (LOI) versus aluminium oxides (AI2O3), sulphate and chloride contents with depths, are developed for soils samples of the Eastern part of Peninsular Malaysia. The results show that CEC values are influenced by the high pH values. The sulphate and chloride, both found existed in the granitic soil samples, increase with depth. The correlation between Silicon Oxide and plasticity index is found to be inversely related; this is due to the existence of quartz minerals which reduce the plasticity of soils, whereas AI2O3 and FeiOj in clay minerals increase the plasticity of soils.

Item Type:Conference or Workshop Item (Paper)
Uncontrolled Keywords:physical properties; chemical properties; granitic soils; mineralogy; oxides elements
Subjects:T Technology > TA Engineering (General). Civil engineering (General) > TA1-163 Engineering (General). Civil engineering (General)
Divisions:Faculty of Civil and Environmental Engineering > Department of Transport and Geotechnique Engineering
ID Code:1879
Deposited By:Normajihan Abd. Rahman
Deposited On:04 Oct 2011 12:22
Last Modified:04 Oct 2011 12:22

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