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ASTM C181-09

Historical Revision

Standard Test Method for Workability Index of Fireclay and High-Alumina Plastic Refractories

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1.1 This test method covers the determination of the workability index of fireclay and high-alumina plastic refractories by measuring the plastic deformation of a molded test specimen when subjected to impacts.

1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.

1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

Workability index serves as a measure of the facility with which plastic refractory materials can be rammed, gunned, or vibrated into place.

Workability index is commonly used to control consistency of plastics during manufacture. It has also been found useful for specification acceptance by the consumer.

The workability index determination can provide information for developing a plastic body. When a sample splits under impact at various water contents, it is an indication that the material is short or lacking in plasticity.

Determinations on samples that split during impact will be difficult to reproduce. If the sample splits, the measurement is not a true indication of deformation. This should be noted in the report.

SDO ASTM: ASTM International
Document Number C181
Publication Date Sept. 1, 2009
Language en - English
Page Count 3
Revision Level 09
Supercedes
Committee C08.09
Publish Date Document Id Type View
Oct. 1, 2011 C0181-11 Revision
Sept. 1, 2009 C0181-09 Revision
Nov. 1, 2003 C0181-03 Revision
Feb. 10, 1997 C0181-91R97E01 Revision
Oct. 1, 2018 C0181-11R18 Reaffirmation