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ASTM C401-12(R2018) pdf free download

ASTM C401-12(R2018) pdf free download.Standard Classification of Alumina and Alumina-Silicate Castable Refractories
1. Scope
1.1 This classification covers alumina and alumina-silicate castable refractories that, when tempered with water, will develop structural strength by chemical action. 1.2 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 appro- priate safety, health, and environmental practices and deter- mine the applicability ofregulatory limitations prior to use. 1.3 This international standard was developed in accor- dance with internationally recognized principles on standard- ization established in the Decision on Principles for the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
3. Significance and Use
3.1 Alumina and alumina-silicate castable refractories are produced to yield property characteristics commensurate with different end-use properties. Volume stability, modulus of rupture, bulk density, and lime content have become useful measures to distinguish various alumina and alumina-silicate castable formulations for initial fitness for service. This clas- sification is considered useful for purchase specifications and for quality control.
4. Basis of Classification
4.1 Alumina and alumina silicate castable refractories that contain a hydraulic setting cement and have a density ofgreater than 105 lb/ft 3 (1.68 g/cm 3 ) may be classified by the lime (CaO) content as contributed by the cement. The classifications are shown in Table 1. While this standard only uses the lime content as contributed by cement, other sources oflime may be present in the mix and may affect the performance of a material. 4.2 Refractory castables classified as conventional castable refractories having a modulus of rupture after drying of at least 300 psi (2.07 MPa) are normal strength, and those having at least 600 psi (4.14 MPa) modulus of rupture are high-strength types. They are further classified on the basis of volume stability of cast test brick when fired at the temperatures prescribed in Table 2. 4.3 Insulating Refractory Castables—This class includes insulating castable refractories which are classified on the basis of bulk density of dried cast test brick and volume stability of such test brick when fired at the temperatures prescribed in Table 3.
5. Test Methods
5.1 The properties enumerated in this classification shall be determined in accordance with the following ASTM methods: 5.1.1 Modulus ofRupture—Test Methods C133 on test brick with Practice C862, and after oven drying in accordance with the Curing of Test Specimens section of Practice C862. Specimens should be fired as given in heating schedule of Practice C865. 5.1.2 Permanent Linear Change—Test Method C113 on specimens prepared in accordance with Practice C862 and fired as given in heating schedule of Practice C865. 5.1.3 Bulk Density—Test Methods C134 on test brick pre- pared and oven dried in accordance with Practice C862 and fired as given in heating schedule of Practice C865.
6. Retests
6.1 Because of variables resulting from sampling and the lack of satisfactory reproducibility in tests conducted by different laboratories, the material may be resampled and retested when requested by either the manufacturer or the purchaser. This may apply in instances when the first test results do not conform to the requirements prescribed in this classification. The final results to be used shall be the average of at least two sets of results, each of which has been obtained by following in detail the specified testing procedures.
7. Keywords
7.1 alumina; alumina-silicate; castable refractories; insulat- ing castable refractories; low-cement castable refractories; no-cement castable refractories; regular castable refractories; ultra-low cement castable refractories

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