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Significance and Use
4.1 The true specific gravity of a material is the ratio of its true density, determined at a specific temperature, to the true density of water, determined at a specific temperature. Thus, the true specific gravity of a material is a primary property which is related to chemical and mineralogical composition.
4.2 This test method is particularly useful for hydratable materials which are not suitable for test with Test Method C135.
4.3 For refractory raw materials and products the true specific gravity is a useful value for: classification, detecting differences in chemical composition between supposedly like samples, indicating mineralogical phases or phase changes, calculating total porosity when the bulk density is known, and for any other test method that requires this value for the calculation of results.
4.4 This test method is a primary standard method which is suitable for use in specifications, quality control, and research and development. It can also serve as a referee test method in purchasing contracts or agreements.
4.6 In interpreting the results of this test method it must be recognized that the specified sample particle size is significantly finer than specified for Test Method C135. Even this finer particle size for the sample does not preclude the presence of some closed pores, and the amount of residual closed pores may vary between materials or even between samples of the same or like materials. The values generated by this test method may, therefore, be very close approximations rather than accurate representations of true specific gravities. Thus, comparisons of results should only be judiciously made between like materials tested by this test method or with full recognition of potentially inherent differences between the materials being compared or the test method used.
1.1 This test method covers the determination of the true specific gravity of solid materials, and is particularly useful for materials that easily hydrate which are not suitable for test with Test Method C135. This test method may be used as an alternate for Test Method C135, Test Method C128, and Test Method C188 for determining true specific gravity.
1.2.1 Exception—In 7.3 the equivalent SI unit is expressed in parenthesis.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
C128 Test Method for Density, Relative Density (Specific Gravity), and Absorption of Fine Aggregate
C135 Test Method for True Specific Gravity of Refractory Materials by Water Immersion
C188 Test Method for Density of Hydraulic Cement
ICS Number Code 81.080 (Refractories)