Text-Book on Roads and Pavements

Text-Book on Roads and Pavements

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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. 1908 edition. Excerpt: ...Brick Manufacturers' i Association have considered the matter, and in I895 appointed a committee which in I897 reported a set of rules for making the tests, with resolutions expressing their views as to the relative importance and reliability of each. These rules, which were somewhat modified in I900, are very commonly followed and furnish a standard method of testing. CRUSHING TEST. The recommendations of the commission for conducting this test are as follows: "I. The crushing test should be made on halfbricks, loaded edgewise, or as they are laid in the street. If the machine used is unable to crush a full half-brick, the area may be reduced by chipping off, keeping the form of the piece to be tested as nearly prismatic as possible. A machine of at least I00,000 pounds capacity should be used, and the specimen should not be reduced below 4 square inches of area in cross-section at right angles to direction of load. "II. The upper and lower surfaces should preferably be ground to true and parallel planes. If this is not done, they should be bedded in plaster of Paris while in the testing-machine, which should be allowed to harden ten minutes under the weight of the crushing planes only before the load is applied. "III. The load should be applied at a uniform rate of increase to the point of rupture-. "IV. Not less than an average obtained from 5 tests, on 5 different bricks, shall constitute a standard test." The result of a compressive test of stone or brick depends very largely upon how it is made, and the results of tests are only properly comparable with others made in the same manner and with equal care. The use of plaster beds as suggested above, it is thought, conduces greatly to regularity of result in...show more

Product details

  • Paperback | 102 pages
  • 189 x 246 x 5mm | 195g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236771168
  • 9781236771162