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Technologic Papers of the Bureau of Standards Volume 15-28

Technologic Papers of the Bureau of Standards Volume 15-28


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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1914 Excerpt: ... firing of clays brings about a decrease in the initial pore space, a process which as it approaches completion is called vitrification. This closing up of the pore space is caused by the softening of the mass and the effect of surface tension which operates to bring about a condition of minimum surface area. The progress of vitrification then can be followed by means of porosity determinations, provided the structure of the material in question is sufficiently open to allow of the ready escape of the gases evolved. If at any time the evolution of gaseous matter is rapid enough so that pressure is produced within the clay, bloating is certain to take place and a vesicular structure will be formed. 2. OPEN AND INCLOSED PORE SPACE Assuming that normal conditions prevail and that vitrification progresses steadily, one aspect of the decrease in porosity must receive attention. Starting with maximum porosity immediately after the dehydration of a clay it is found that the total pore space is practically measured by the volume of water absorbed in vacuo. This indicates that the pore system is open and the capillaries communicate with each other. During vitrification some of the fine channels are closed and thus cut off a portion of the pore space. The system therefore is no longer open and must be divided into open and inclosed pore space. Gas evolved within one of the inclosed pores must break its way through the walls in order to escape. Since the viscosity of most clays still remains very considerable, it is readily seen that gas vesicles may be under considerable pressure before they are released, when they leave behind greatly enlarged spaces. Anywhere throughout the clay mass, especially in connection with cavities left during the molding, gas accumulations...


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Product Details
  • ISBN-13: 9781130682175
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 242
  • Spine Width: 13 mm
  • Width: 189 mm
  • ISBN-10: 113068217X
  • Publisher Date: 01 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 440 gr


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