Standard Test Method for Quantitatively Measuring the Effect of Thermal Shock and Thermal Cycling on Refractories
Determination of the relative thermal shock resistance of refractories by using 5 alternating 10 minute heating at 2190ï‚°F and cooling in air cycles. Ten specimens 1" x 1" x 6 per type/brand are required by ASTM, and both the actual and percent change in strength and ultrasonic properties are reported.
SIGNIFICANCE AND USE
This test method indicates the ability of a refractory product to withstand the stress generated by sudden changes in temperature.
Because the recommended furnace temperature of this cycling test is 1200°C (2190°F), this test method may not indicate the ability of a refractory product to withstand cycling at higher or lower temperatures, especially if the existing morphology of the refractory product changes.
This test method is useful for research and development, as well as for comparing refractory products. The precision should be considered when using this test for specification purposes.
1.1 This test method is used for determining the strength loss or reduction in continuity, or both, of prism-shaped specimens which are cut from refractory brick or shapes and subjected to thermal cycling.
1.2 The strength loss is measured by the difference in modulus of rupture (MOR) between uncycled specimens and the specimens subjected to thermal cycling.
1.3 The reduction in structural continuity is estimated by the difference in sonic velocity before and after thermal cycling.
1.4 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.
1.5 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.
Extracted, with permission, from ASTM C1171 Standard Test Method for Quantitatively Measuring the Effect of Thermal Shock and Thermal Cycling on Refractories, copyright ASTM International, 100 Barr Harbor Drive, West Conshohocken, PA 19428. A copy of the standard may be purchased from ASTM International, phone 610-832-9555, e-mail: firstname.lastname@example.org, website: www.astm.org.
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