Publisher's Synopsis
Excerpt from Fire Tests of Columns Protected With Gypsum
The gypsum blocks used for the protective coverings in the other tests were cut from ordinary 2-inch solid and 3-inch hollow gypsum partition tiles having approximately 3 percent of wood fiber in the form of fine excelsior. These when tested for transverse breaking strength with a concentrated load at the center of a 28-inch span gave breaking loads of 230 and 420 pounds or moduli of rupture of 200 and 185 lb. For the solid and hollow blocks. The modulus of rupture of the hollow blocks was computed on the gross section. Compressive strengths were determined on half-length blocks remain ing from the transverse tests. The results for edge and end bearings, respectively, were for solid blocks, 920 and 810 and for hollow blocks, 760 and 770 lb./in.2 of net area.
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