METHOD FOR DETERMINATION OF WATER CONTENT IN ETTRINGITE MOLECULE INCLUDED IN INORGANIC OXIDE MATERIAL

摘要

PROBLEM TO BE SOLVED: To rapidly and precisely measure a water content in an ettringite molecule included in an inorganic oxide material.SOLUTION: With respect to ettringite for which heating temperature is preliminarily changed, a solid NMR (nuclear magnetic resonance) spectrum is measured. Half-value width of a peak of the ettringite at each heating temperature is specified and a water content in an ettringite molecule at each heating temperature is determined from a mass reduction rate of the ettringite before heating. After generation of a correlation diagram showing a relationship between the half-value width of the peak of the ettringite at each heating temperature that is obtained from theAl solid NMR spectrum and the water content in the ettringite molecule, the solid NMR spectrum is measured with respect to an inorganic oxide material to be evaluated, and the water content in the ettringite molecule included in the inorganic oxide material is determined on the basis of the correlation diagram.