Abstract
The Ruhr and the Audibert-Arnu methods are two International Standard (ISO) tests for evaluating the caking properties of coal which are widely used in North America and Europe. These two methods are examined with the intent of reconciling the different expansion data. Factors that affect percentage dilatation are discussed. Dilatation is shown to depend primarily on the mass of air-dried coal charged into the retort tube, provided that the heating rate, inside tube diameter, water added to the coal and particle size distribution of the sample are the same. It is found that expansion data reported on an air-dried weight specific basis are nearly method-independent. The experimental work in support of this observation involved dilatation analysis on weighed test specimens (coal pencils), with a known added water content, using both methods.
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