ASTM C604-02(2007)e1

    Historical Standard: Стандартный метод испытания для определения истинного удельного веса огнеупорных материалов посредством газо-компараторного пикнометра


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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.

    This test method is particularly useful for hydratable materials which are not suitable for test with Test Method C 135.

    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.

    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 contamination has been introduced during processing of the sample,

    The ignition of the sample has eliminated all free or combined water without inducing sintering or alteration,

    An inert gas (helium) has been used in the test, 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 is significantly finer than specified for Test Method C 135. 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. Область применения

    1.1 Настоящий метод испытаний описывает определение истинного удельного веса твердых материалов и особенно полезен для анализа материалов, которые хорошо гидратируют (поглощают воду) и непригодны для испытания по Методу С 135. Настоящий метод испытания может быть применен в качестве альтернативы Методов испытания С 135, С 128 и С 188 для определения истинного удельного веса.

    1.2 Единицы измерения — Значения, указанные в системе дюйм-фунт, должны рассматриваться в качестве стандартных. Другие единицы измерения в настоящем стандарте не применяются.

    1.2.1 Исключения — В п. 7.3 эквивалент единицы системы СИ представлен в скобках.

    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 техникибезопасности и охраны труда, а также определение применимости нормативных ограничений перед его использованием.

    2. Ссылочные документы

    C128 Test Method for 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

    E11 Specification for Woven Wire Test Sieve Cloth and Test Sieves

    E177 Practice for Use of the Terms Precision and Bias in ASTM Test Methods

    E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method