ASTM C173/C173M - 16

    Método de Ensayo Normalizado de Contenido de Aire de Concreto Recién Mezclado por el Método Volumétrico

    Active Standard ASTM C173 / C173M Developed by Subcommittee: C09.60

    Book of Standards Volume: 04.02


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    Significance and Use

    3.1 This test method covers the determination of the air content of freshly mixed concrete. It measures the air contained in the mortar fraction of the concrete, but is not affected by air that may be present inside porous aggregate particles.

    3.1.1 Therefore, this is the appropriate test to determine the air content of concretes containing lightweight aggregates, air-cooled slag, and highly porous or vesicular natural aggregates.

    3.2 This test method requires the addition of sufficient isopropyl alcohol, when the meter is initially being filled with water, so that after the first or subsequent rollings little or no foam collects in the neck of the top section of the meter. If more foam is present than that equivalent to 2 % air above the water level, the test is declared invalid and must be repeated using a larger quantity of alcohol. Addition of alcohol to dispel foam any time after the initial filling of the meter to the zero mark is not permitted.

    3.3 The air content of hardened concrete may be either higher or lower than that determined by this test method. This depends upon the methods and amounts of consolidation effort applied to the concrete from which the hardened concrete specimen is taken; uniformity and stability of the air bubbles in the fresh and hardened concrete; accuracy of the microscopic examination, if used; time of comparison; environmental exposure; stage in the delivery, placement and consolidation processes at which the air content of the unhardened concrete is determined, that is, before or after the concrete goes through a pump; and other factors.

    1. Alcance

    1.1 Este método de ensayo trata sobre la determinación del contenido de aire de concreto recién mezclado que contiene cualquier tipo de agregado, ya sea denso, celular, o liviano.

    1.2 Los valores indicados en unidades SI o en unidades pulgada-libra deben ser considerados separadamente como los estándares. Las unidades pulgada-libra se muestran entre corchetes. Los valores indicados en cada sistema pueden no ser exactamente equivalentes; por eso, cada sistema debe ser utilizado independientemente del otro. La combinación de valores de los dos sistemas puede resultar en la no conformidad con la norma.

    1.3 Esta norma no pretende dirigir todas las inquietudes sobre seguridad, si las hay, asociadas con su utilización. Es responsabilidad del usuario de esta norma establecer prácticas apropiadas de seguridad y salud y determinar la aplicabilidad de las limitaciones reguladoras antes de su uso. (Advertencia—Las mezclas cementicias hidráulicas son cáusticas y pueden causar quemaduras químicas en la piel y los tejidos frente a la exposición prolongada2).

    2. Documentos Citados