New Processing of Airborne Magnetic and Electromagnetic Data and Interpretation for Subsurface Structures in the Loei Area, Northeastern Thailand

Kachentra Neawsuparpa, ^*, Punya Charusiria, ^** and Jayson Meyers^b

ABSTRACT: This study assesses the possible use of Korat clays, deposited at Suranaree University of Technology (SUT), for the production of lightweight aggregates. The SUT clays were collected and divided into 2 groups, i.e. white clay and reddish brown clay, to study their heat-treatment behavior. The SUT clay mixtures in various ratios were investigated to find the suitable compositions and heat-treatment (between 1000 and 1250?C) for the production of lightweight aggregates. After firing at 1250?C, the SUT clays expanded 21.05 and 5.70% for the white and reddish brown clays, respectively. Firing expansion was mainly dependent on the amount of SiO₂, fluxing oxides and water of the raw materials. These aggregates are highly impervious to water and exhibit considerable firing expansion, low bulk density (1.29-1.76 g/cm₃) and fair technical properties (unit weight and bending strength) for lightweight concrete. These results encourage the use of these clays for the production of lightweight aggregates.

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a Research Unit for Earthquake and Tectonic Geology (EATGRU), c/o Department of Geology, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand.
b Exploration Geophysics, Curtin University of Technology, PO Box1987, Perth, WA 6845, Australia.
* Present address: Geotechnics Division, Department of Mineral Resources, Bangkok 10400, Thailand, email: kachen@dmr.go.th

** Corresponding author e-mail: cpunya@chula.ac.th

Received 19 Jan 2005, Accepted 25 may2005