Abstract
This paper deals with the question of "workability" of hydrated limes for finishing purposes. The authors subscribe to the "colloid" conception of the mechanism underlying the well known superiority of undried putties over dry hydrates, on the one hand, and of magnesian or dolomitic hydrates over those high in calcium, on the other.A description is given of an investigation made to determine whether an artificial gel could be applied to particles otherwise of poor quality by allowing them to react with aluminium sulphate. It was anticipated that the calcium hydroxide would react to form calcium sulphate and give a precipitate of aluminium hydroxide which, being relatively insoluble in the alkaline medium, would tend to coat the particles of calcium sulphate and residual calcium hydroxide. The effect of additions under different conditions was observed quantitatively by means of a flow-table plasticimeter. Favorable laboratory results were followed by practical trials which successfully demonstrated the usefulness of this treatment.
Published Version
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