Recent Investigations of the System Lime-Alumina-Calcium Sulfate-Water and its Importance in Building Research Problems
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The general chacter of the complex calcium aluminate sulfate hydrates in the quaternary system is outlined. on the basis of the previous publicntioue of F. E. Jones and of revised determinations of the concentration of the equi-librium solutions. New projection methods for the quaternary equilibrium are given which are particularly obvious for solutions of very low concentrations in lime, calcium sulfate, and alumina hydrate. The importance of unstable crys-tallizations is emphasized, especinlly the formation of crystillaine solutions of tetrecalcium aluminate hydrate and 3CaO * A12O3 * 12H2O. The use of the revised equilibrium diagram for the explanation of thr reactions of sulfate solutions with poazolnns containing hydraulic binders is particularly illustrated. The role of activated alumina in zeolitic weathering minerals of pozzolanic and related rock types is emphasized for the correct interpretation of such reactions.