Cyclopedia of Architecture, Carpentry And Building; a General Reference Work.. 3
Cyclopedia of Architecture, Carpentry And Building; a General Reference Work.. 3
American School of Correspondence At Armour Institute of Technology, Chicago
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Slag Cements are those formed by an admixture of slaked lime with ground blast-furnace slag. The slag used has approximately the composition of an hydraulic cement, being composed mainly of silica and alumina, and lacking a proper proportion of lime to render 840 MASONRY CONSTRUCTION 27 it active as a cement. In preparing the cement the slag upon coming from the furnace is plunged into water and reduced to a spongy form from which it may be readily ground. This is dried and ground to a fine pow...der. The powdered slag and slaked lime are then mixed in proper proportions and ground together, so as to very thoroughly distribute them through the mixture. It is of the first importance in a slag cement that the slag be very finely ground, and that the ingredients be very uniformly and intimately incorporated. Both the composition and methods of manufacture of slag cements vary considerably in different places. They usually con- tain a higher percentage of alumina than Portland cements, and the materials are in a different state of combination, as, being mixed after the burning, the silicates and aluminates of lime formed during the burning of Portland cement cannot exist in slag cement.
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