Testing of Cement Blocks
Prof. John R. Allen, University of Michigan, Ann Arbor
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With the increasing use of cement as a building material there should be devised some standard method of testing the various cement products. As long as cement was in use for sustaining loads which produced only compression in the material, the testing of finished cement product was of less importance. Recently, however, cement, especially in the form of reinforced concrete, has been used where it is subject to strains in tension as well as in compression. The strength of cement in tension being only from one-fourth to one-sixth of its strength in compression, it is very important that we know what the tensile strength of the cement product is.