TESTS OF WISCONSIN BUILDING STONE 533 



MODULUS OF ELASTICITY 



Up to the present time very few determinations of the 

 modulus of elasticity have been made, especially in the United 

 States. However, a knowledge of the modulus~of elasticity is 

 of value to architects and builders in many of their calcu- 

 lations. 



The modulus of elasticity was determined for granite from 

 eleven different quarries. The results varied between wide 

 limits, ranging all the way from 156,000 pounds to 2,070,000 

 pounds per square inch. The first result is comparatively low, 

 while the latter is very high. Four samples of granite from 

 Wausau gave tests of from 1,040,000 to 1,815,000 pounds per 

 sa^are inch. The Athelstane granite from Amberg tested very 

 close to 1,000,000 pounds per square inch. The Pike River 

 gray granite from the same place tested nearly 1,500,000 pounds 

 per square inch. 



The modulus of elasticity was determined for limestone from 

 four different quarries. The results obtained varied from 31,500 

 pounds per square inch to 869,400 pounds per square inch. The 

 highest result was obtained for limestone from the Washington 

 Stone Company's quarry which is located at Sturgeon Bay. 



The modulus of elasticity was determined for samples of 

 sandstone from ten different quarries. The results of these tests 

 varied from 32,000 pounds to 400,800 pounds per square inch. 

 The highest result was obtained for samples of white sandstone 

 from the Chicago & Northwestern Railway Company's quarry at 

 Ablemans. The modulus of elasticity of the Lake Superior 

 brown sandstone ranged from 56,000 to 387,900 pounds per 

 square inch. 



In general it will be noted that the modulus of elasticity 

 corresponds approximately with the crushing and transverse 

 strength of the different rocks tested. The crushing strength, 

 transverse strength, and modulus of elasticity were all lower for 

 the sandstone samples tested than for either the limestone or 

 granite. 



