Iron ores, salt and sandstones . tests are given in chapter XXVI. The following tests on West Virginia building stonewere made: I Compression or crushing. 2 Transverse strength. 3 Shearing strength. 4 Elasticity. 5 Effects of wide variations in temperature 6 Coefficient of expansion. 7 Porosity. 8 Specific gravity. 9 Weight per cubic foot. 10 Effects of freezing. 11 Fire resistance. 12 Effects of acid fumes. 1. Compression or Crushing Tests. The crushing strength of building stone expressed inpounds per square inch has long been a popular test in deter-mining the quality of stone. Where only o
Iron ores, salt and sandstones . tests are given in chapter XXVI. The following tests on West Virginia building stonewere made: I Compression or crushing. 2 Transverse strength. 3 Shearing strength. 4 Elasticity. 5 Effects of wide variations in temperature 6 Coefficient of expansion. 7 Porosity. 8 Specific gravity. 9 Weight per cubic foot. 10 Effects of freezing. 11 Fire resistance. 12 Effects of acid fumes. 1. Compression or Crushing Tests. The crushing strength of building stone expressed inpounds per square inch has long been a popular test in deter-mining the quality of stone. Where only one test is made,this is the one selected, and it is often included in buildingspecifications. The crushing test alone does not throw muchlight on the quality or durability of a given stone, but takenin combination with other tests it serves a useful purpose. In the Washington monument, 555^2 feet high, the stoneat the base is calculated to sustain a maximum pressure tons per square foot, or pounds per square Plate XXIV.—A.—Residual Pyramids after Crushing Tests on WestVirginia Sandstones.
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