Proceedings of the Annual Convention Volume 6

Proceedings of the Annual Convention Volume 6

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1910 edition. Excerpt: ...structural strength of the concrete than another, both working under the same specifications. The concrete was tested in the same laboratory on the same day, and yet varied 33 per cent., not only in one test but in the majority of them. This shows that one man knew his business and the other did not. To the consulting engineer the testing is really as important as anything else, and this provision of special regulations for having cubes tested to my mind is not sufficient, because I have found that if concrete has a high compressive strength it naturally has a high tensile strength, if low, the tensile strength will be low. It is largely a matter of getting the concrete up to the standard. VVe have no trouble with shearing cracks, provided the beam is designed properly. Other considerations, however, enter into the construction of a building outside of the concrete work and the aggregates or materials used. The placing of the reinforcement has a great deal to do with it. the number of stirrups in the beam, the relation of the depth of the beam to its span, are all important things for the engineer to understand. I have seen buildings that Mr. Perrot. Mr. Larned. collapsed due to diagonal tension, not that the material was wrong, but that it was placed wrong, giving an insufiicient number of stirrups to the beam. Test the same concrete as a cube and you will find that it comes up to the requirements of the specifications. The workmen did not put the concrete in properly and the stirrups were not correctly distributed. Other conditions also entered into the failure, and the beam had to be taken out. So it is not merely testing that is necessary to secure safe work. MR. E. S. LARNED.---Vhere a comparison of tensile with compression tests more

Product details

  • Paperback | 178 pages
  • 189 x 246 x 10mm | 327g
  • United States
  • English
  • black & white illustrations
  • 1236928636
  • 9781236928634