- Author
-
Heindl, R. A.
|
Pendergast, W. L.
- Title
- Panel Tests for Thermal Spalling of Fire-Clay Bricks Used at High Temperatures.
- Coporate
- National Bureau of Standards, Washington, DC
- Journal
-
Journal of Research of the National Bureau of Standards,
Vol. 34,
73-96,
January 1945
- Report
-
Research Paper 1630,
- Keywords
-
bricks
|
spalling
|
high temperature
|
furnaces
|
pressure
|
heating
|
temperature
|
temperature measurements
|
absorption
|
tests
|
clay
- Identifiers
- linear change; volume stability; pyrometric cone equivalent; bulk density
- Abstract
- Fifty brands of fire-clay brick, of which 16 were of the super duty, 28 of the high heat duty, and 6 of the intermediate heat duty classes, were tested for resistance to spalling by the standard method of the American Society for Testing Materials. Variations from the standard panel of brick in stretcher construction were made by laying brick as headers only, and also in combinations of stretchers and headers. The relation of gas pressure in the conditioning, or preheating, furnace, within the range 0.2 to 0.6 inch of water, to the spalling of firebrick was also investigated. The stability of volume and change in absorption resulting from reheating new specimens at 1,600 deg C for 5 hours under conditions of controlled gas pressure were determined of all the brands of the super duty class of brick as well as of 10 brands of the high heat duty class, the latter being reheated at 1,400 deg C only. The relation between the spalling loss by gravity only and after scraping with a trowel was investigated, as was also the relation between the spalling loss and the number of joints in the brick panel.