ON THE MODULUS OF ELASTICITY OF MAGNESITE REFRACTORIES. XIII

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Abstract
Mixtures of 80 or 100 parts of a pulverized clinker and 20 or 0 pt. of a pulverized calcined magnesite were, on addition of aqueous solutions of dextrin, magnesium chloride, and magnesium sulphate, pressed to test pieces under a pressure of 1000kg. per sq. cm. The test pieces have been examined for compressive strength after 1 week, that on drying, that on heating at temperatures ranging from 100 to 1160°C, and also that on firing to cone 16 with the following results:(1) Compressive strength of the unburnt specimens has been suddenly reduced with an increase of the content of moisture.(2) It is likely that the temperature thereat the compressive strength of each specimen is lowest is lowered with a depression of the purity of the clinker.(3) The temperature has been lowest with dextrin, medium with magnesium chloride, and highest with magnesium sulphate.(4) The hot minium strength seems to be very low with dextrin, much higher with the chloride, and very high with the sulphate.(5) The range of temperatures at which the specimens hardened with the sulphate have shown the lowest or like strength has been narrow.(6) Test pieces which were made of the pulverized clinker and a solution of magnesium sulphate and by pressing with a pressure of 1000kg. per sq. cm. have shown the minimum hot compressive strength of 294kg. per sq. cm. They can probably be used without firing. They have shown linear firing shrinkage of 5% or thereabouts. However the shrinkages will be reduced by half by introducing coarse grain of the clinker up to about 50%.

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