Preliminary Report Volume 3; V. 5-8

Preliminary Report Volume 3; V. 5-8

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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. 1918 edition. Excerpt: noted in molding the specimens. 3. Drying shrinkage, expressed in per cent of the volume of the dried material. Note color of dried material and presence of discoloration due to effiorescence of salts. Note also any tendency of the clay to check or crack in drying. 4. Computation of amount of pore and shrinkage water held by the clay in the plastic state. 5. Determination of the weight and character of the granular impurities left on the 40, 80, 120 and 200-mesh sieves. 6. Determination of the transverse strength of dried bars of clay. 7. Volume and porosity changes of the clays when fired to temperatures between 980 and 1300 C, representing intervals of from 20--40 C. Rate of heating to be 30 per hour. 8. Determination of the transverse strength of bars fired below and to the proper maturing temperature and at a point 20 C. above the latter point. 9. Observation of the color of the specimens fired to the different ' temperatures. 10. Determination of the softening temperatures of the clays by means of cones. (b) White and light burning clays. 1. Amount of water of plasticity. 2. Working quality and plasticity. 3. Drying shrinkage and color of dried clay compared with English china clay. 4. Computation of pore and shrinkage water. 5. Determination of granular impurities on 40 to 200.mesh sieves. 6. Determination of residue left when clay is elutriated using a current of water flowing with the velocity of 0.18 mm. per second. 7. In case of kaolins prepare 1 kg. of material floated off by water flowing with the above velocity; determine drying shrinkage as under (3), color of dried clay, compute shrinkage and pore water, as under (4) and test firing behavior as under 9, 10 and 12 of this schedule. This is to be done only with more

Product details

  • Paperback | 136 pages
  • 189 x 246 x 7mm | 254g
  • United States
  • English
  • black & white illustrations
  • 1236842308
  • 9781236842305