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    ASTM C567-05a

    Historical Standard: Método Normalizado de Ensayo para la Determinación de la Densidad de Concreto Estructural Liviano

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    Significance and Use

    The measured or calculated equilibrium density of structural lightweight concrete determines whether specified density requirements have been met. Unless otherwise specified, determine equilibrium density by calculation using the procedures in 9.2.

    Test Method C 138/C 138M shall be used to determine the density of freshly mixed lightweight concrete for compliance with concrete placement specifications.

    Note 1—The fresh density of lightweight aggregate concrete is a function of mixture proportions, air content, water demand, and the specific density and moisture content of the lightweight aggregate. Decrease in density of a specific lightweight concrete is due to moisture loss that, in turn, is a function of aggregate moisture content, ambient conditions, and the ratio of the surface area to the volume of the concrete member. For most structural lightweight concretes, equilibrium density is approached at about 90 days. For most high-strength lightweight concretes, equilibrium density is approached at about 180 days. Extensive tests demonstrate that despite variations in the initial moisture content of lightweight aggregate, the equilibrium density will be approximately 50 kg/m3 (3.0 lb/ft3) greater than the oven-dry density.

    1. Alcance

    1.1 Este método de ensayo provee procedimientos para determinar las densidades seca al horno y de equilibrio de concreto estructural liviano.

    1.2 Los valores indicados en unidades SI son los valores estándar. Los valores entre paréntesis son proporcionados sólo a título indicativo.

    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.

    2. Documentos Citados

    C125 Terminology Relating to Concrete and Concrete Aggregates

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

    C172 Practice for Sampling Freshly Mixed Concrete

    C192/C192M Practice for Making and Curing Concrete Test Specimens in the Laboratory

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

    C470/C470M Specification for Molds for Forming Concrete Test Cylinders Vertically

    C88 Test Method for Soundness of Aggregates by Use of Sodium Sulfate or Magnesium Sulfate

    E104 Practice for Maintaining Constant Relative Humidity by Means of Aqueous Solutions