Abstract
The relations between hemi-hydrate and slags with latent hydraulic properties were discussed by Wünenberg in 1951, and those between the former and calcium hydro-oxide were in formed by K. Aichinger and B. Wander in 1950. Schöenhöfer also has discussed about the physical characteristics of the hydraulic property,
The authors, applying slag on calcium hydro-oxide and admixing some quantities of certain exciting chemicals, recongnized a prominent increase of tensile strenght. In other words, by the study of the authors, it was found that the application of only 1.5% wt. of slag can give a prominent extensions the physical properties of Gypsum.
