The Effect of Acids And Alkalies Upon Clay in the Plastic State volume No 17
The Effect of Acids And Alkalies Upon Clay in the Plastic State volume No 17
Albert Bleininger
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The rules laid down by Rohland do not seem to apply, since in the main the acids cleaily caused shrinkage to decrease while the alkalies produced the reverse effect, which is contrary to his statements. In order to be fair, however, attention must be called to the fact that shrinkage in this work has been considered a meastu-e of plasticity, while Rohland speaks of plasticity itself without attempting to correlate this property with any numerical value. As is well known, there is at the present... time no clear conception as to the relation be- tween plasticity and shrinkage excepting the general fact that the plastic clays as a class show a greater dr>dng shrinkage than the leaner ones. DISCUSSION. Mr. R. J. Montgomery: I should like to ask Prof. Bleininger how long those slips in the cylinders had stood when the photo- graphs were taken. Prof. Bleininger: Twenty-four hours. I might add also that in making the volume determinations they were stored twelve hours in a moist chamber in order to bring about some sort of an equilibrium between the clay and the reagent.
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