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035			_a.b10209645
099			_aAIT Thesis no.GT- 81-25
100	1		_aKim, Gyo Won
245		0	_aDispersive soils in Northeastern Thailand
260			_aBangkok : _bAsian Institute of Technology, _c1982
300			_avii, 73 p.
490	1		_aThesis ; _vno. GT-81-25
500			_aA thesis submitted in partial fulfillment of the requirements for the degree of Master of Science, School of Engineering and Technology
500			_aThesis (M. Sc.) - Asian Institute of Technology, 1982
520			_aTests on the physical, chemical and mineralogical properties on the soils from 3 selected sites of dispersive soils and 1 selected site of nondispersive soil are carried out in the field and laboratory during this study. In order: to find out the relationship between clay contents and dispensability of the soil, some specimens are artificially mixed with a certain amount of clay in the laboratory and tested by means of pinhole tests. The artificial soils are dispersed in pinhole tests regardless of its clay content. For the relationship between the dispersity and a water content and/or a density of the specimen on natural soils, pinhole tests are also carried out at a different water content and different tamps per layer. Natural soils are dispersed in pinhole tests regardless of their water content and a number of tamps per layer. Chemical properties on the soil saturation extract and reservoir water are also determined by means of sodium adsorption ratio(SAR), exchangeable sodium percentage(ESP) and pH. The dispersive soils in the region have ranges of 1.8-6.7 SAR, 1.4-7.9 ESP and 5.4-9.0 pH, while a nondispersive soil has only 0.5 SAR, no ESP and 4.3 pH. The main minerals of the clay fraction in the soil are montmorillonite, kaolinite and illite which are analyzed by the X-ray diffraction method. The dispersive soils in this region have somewhat higher SAR, ESP and pH value chemically, and higher content of a montmorillonite mineralogically than those of the nondispersive soil. The dispersive soil area has distinct features, i.e., a pseudocarps and cloudy water which are good indicators of the dispersive soil area in the field.
650		0	_aSoils _xThailand, Northeastern _xTesting
700	0		_aPrinya Nutalaya, _eChairperson
700	1		_aBalasubramaniam, A.S., _eExamination Committee
700	1		_aYudhbir, _eExamination Committee
710	2		_aGovernment of Thailand, _eScholarship Donor
856			_3Full-Text _uhttp://203.159.5.9/ait-thesis/detail.php?q=B21240
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