ASTM C135-96(2009)e1

    Historical Standard: Стандартный метод испытания для определения истинного удельного веса огнеупорных материалов посредством погружения в воду


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    Significance and Use

    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.

    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 which requires this value for the calculation of results.

    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.

    Fundamental assumptions inherent in this test method are the following:

    The sample is representative of the material in general,

    The total sample has been reduced to the particle size specified,

    No impurity has been introduced during processing of the sample,

    The sample itself is not magnetic and all magnetic material introduced during processing of the sample has been removed,

    The material is not hydratable or reactive with water, and

    The test method has been conducted in a meticulous manner.

    Deviation from any of these assumptions negates the usefulness of the results.

    In interpreting the results of this test method it must be recognized that the specified sample particle size does not guarantee that all closed pores have been eliminated. The amount of residual closed pores may vary between materials or even between samples of the same or like materials, and the specified sample particle size is not the same as that specified for Test Method C 604. The values generated by this test method may, therefore, be 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. Область применения

    1.1 Настоящий метод испытания охватывает определение истинного удельного веса огнеупорных материалов при заданных условиях. Метод не распространяется на материалы, разрушаемые водой.

    1.2 Значения, указанные в системе дюйм-фунт, должны рассматриваться в качестве стандартных. Значения, приведенные в скобках, являются математическим пересчетом их в систему единиц измерения СИ, представляются исключительно в информационных целях и не должны рассматриваться в качестве стандартных.

    1.2.1Исключение — В оборудовании, используемом в настоящем стандарте для измерения веса и объема, применяются только единицы системы SI.

    1.3 Настоящий стандарт не ставит целью описание всех проблем безопасности, если они имеются, связанных с его использованием. В обязанности пользователя настоящего стандарта входит определение надлежащих методов техники безопасности и охраны труда, а также определение применимости нормативных ограничений перед его использованием.

    2. Ссылочные документы

    C604 Test Method for True Specific Gravity of Refractory Materials by Gas-Comparison Pycnometer

    D153 Test Methods for Specific Gravity of Pigments

    E11 Specification for Woven Wire Test Sieve Cloth and Test Sieves