TY - JOUR
T1 - Slaking mechanisms of mudstone liner immersed in water
AU - Lin, Tzong Tzeng
AU - Sheu, Chyi
AU - Chang, Juu En
AU - Cheng, Chih Hung
N1 - Funding Information:
This study was funded by the National Science Council of R.O.C. under contract No. NSC 85-2211-E151-003.
Copyright:
Copyright 2004 Elsevier Science B.V., Amsterdam. All rights reserved.
PY - 1998/2
Y1 - 1998/2
N2 - The purpose of this research is to probe the slaking property of the mudstone meeting with water. The elemental, crystalline, and morphologic changes in the mudstone with three different water contents were characterized using X-ray fluorescence spectrometer (XRF), semi-dynamic leach test, X-ray diffractometer (XRD), and scanning electron microscopy (SEM)/energy-dispersive X-ray analysis (EDAX) techniques. The XRF and chemical composition analyses indicated that the mudstone contains high concentrations of silicon and aluminum and low concentrations of calcium, iron, potassium, and sodium. The XRD examination showed large amount of quartz and illite, minor calcium aluminate hydrate and calcium silicate hydrate, and small amount of unidentifiable peaks. The result of semi-dynamic leach test showed that the release of sodium is very rapid initially and the released calcium species increase largely in the final subsequent extractions. The microanalysis using SEM/EDAX indicated that the petal-like structures increase with the moisture content of the mudstone. Thus, it was inferred that the possible mechanisms of the mudstone meeting with water to lead to the slaking phenomenon are stated as follows. The sodium sulfate will rapidly dissolve from the mudstone, and the sulfate species and calcium aluminate hydrate form the platelet-like solid solution of 3CaO-Al2O3-CaSO4·12H2O making the mudstone lose its cementing reaction.
AB - The purpose of this research is to probe the slaking property of the mudstone meeting with water. The elemental, crystalline, and morphologic changes in the mudstone with three different water contents were characterized using X-ray fluorescence spectrometer (XRF), semi-dynamic leach test, X-ray diffractometer (XRD), and scanning electron microscopy (SEM)/energy-dispersive X-ray analysis (EDAX) techniques. The XRF and chemical composition analyses indicated that the mudstone contains high concentrations of silicon and aluminum and low concentrations of calcium, iron, potassium, and sodium. The XRD examination showed large amount of quartz and illite, minor calcium aluminate hydrate and calcium silicate hydrate, and small amount of unidentifiable peaks. The result of semi-dynamic leach test showed that the release of sodium is very rapid initially and the released calcium species increase largely in the final subsequent extractions. The microanalysis using SEM/EDAX indicated that the petal-like structures increase with the moisture content of the mudstone. Thus, it was inferred that the possible mechanisms of the mudstone meeting with water to lead to the slaking phenomenon are stated as follows. The sodium sulfate will rapidly dissolve from the mudstone, and the sulfate species and calcium aluminate hydrate form the platelet-like solid solution of 3CaO-Al2O3-CaSO4·12H2O making the mudstone lose its cementing reaction.
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U2 - 10.1016/S0304-3894(97)00137-4
DO - 10.1016/S0304-3894(97)00137-4
M3 - Article
AN - SCOPUS:0032004631
SN - 0304-3894
VL - 58
SP - 261
EP - 273
JO - Journal of Hazardous Materials
JF - Journal of Hazardous Materials
IS - 1-3
ER -