ASTM C173/C173M-08

    Historical Standard: Método de ensaye estándar para determinar por el método volumétrico el contenido de aire del concreto recién mezclado


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    Significance and Use

    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.

    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.

    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.

    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 ensaye abarca la determinación del contenido del aire en mezclas de concreto fresco recién mezclado que contiene cualquier tipo de agregado, ya sea denso, celular o ligero.

    1.2 Los valores establecidos en unidades pulgada-libra o unidades SI, deben considerarse separadamente como valores estándar. Las unidades SI se muestran en paréntesis. Los valores expresados no son equivalentes exactos; por lo tanto, cada sistema debe ser usado independientemente uno del otro. La combinación de valores de las dos unidades puede no concordar como resultado.

    1.3 Esta norma no pretende solucionar todos los problemas de seguridad que puedan estar asociados con su uso. Es responsabilidad del usuario de esta norma esta blecer las medidas apropiadas de seguridad e higiene, y determinar la aplicabilidad de las restricciones regulatorias antes de usarla. Advertencia – Las mezclas frescas de cementantes hidráulicos son cáusticas y pueden causar quemaduras químicas a la piel y al tejido por una exposición prolongada.

    2. Documentos Citados

    C1064/C1064M Test Method for Temperature of Freshly Mixed Hydraulic-Cement Concrete

    C138/C138M Test Method for Density (Unit Weight), Yield, and Air Content (Gravimetric) of Concrete

    C143/C143M Test Method for Slump of Hydraulic-Cement Concrete

    C172 Practice for Sampling Freshly Mixed Concrete

    C173/C173M

    C231 Test Method for Air Content of Freshly Mixed Concrete by the Pressure Method

    C29/C29M Test Method for Bulk Density (Unit Weight) and Voids in Aggregate

    C31/C31M Practice for Making and Curing Concrete Test Specimens in the Field

    C670 Practice for Preparing Precision and Bias Statements for Test Methods for Construction Materials