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This report describes a method for approximating the glass content of portland cement clinker. The method involves a determination of the heat of solution of the original clinker and of the same clinker which has subsequently been annealed under conditions designed to produce complete crystallization. The difference between the heat values so obtained is due principally to the latent heat of crystallization of the glass present in the original clinker. The ratio between that value and the latent heat of crystallization of the glass phase represents the glass content of the clinker. A curve is given showing the latent heat of crystallization of all possible glass compositions obtainable from melts at 1,400° C in the system CaO-AI20.Si02-Fe20g between the A120g/Fe203 ratios of 0.64 and 3.24.

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