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    ASTM C1218/C1218M-99(2008)

    Historical Standard: Método de Ensayo Normalizado para Cloruros Solubles en Agua en Mortero y Concreto

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    Significance and Use

    Water-soluble chloride, when present in sufficient amount, is capable of leading to initiation or acceleration of the corrosion of metals, such as steel, embedded in or contacting a cement system such as mortar, grout, or concrete. Thus, its determination shall be required to evaluate the potential of a cement system for undergoing such reactions or to investigate cement systems where such reaction has already occurred. However, it must be recognized that water-soluble chloride determined at some particular time in the life of a cement system is capable of being substantially different than that at another time; for example, the service environment is capable of resulting in a higher water-soluble chloride content due to changes in solubility or a lower one due to leaching.

    Test conditions are capable of affecting water-soluble chloride determinations. Take caution when comparing results from this test method with those from other test methods.

    Sulfides are known to interfere with the determination of chloride content. Blast-furnace slag aggregates and cements contain sulfide sulfur in concentrations that are capable of such interference and produce erroneously high test results. Treatment with hydrogen peroxide, as discussed in Test Methods C 114, is used to eliminate such interference.

    There are aggregates that contain chloride that is not available for corrosion. Such chloride will be detected by use of this test method.

    1. Alcance

    1.1 Este método de ensayo provee procedimientos para el muestreo y análisis de mortero de cemento hidráulico o concreto para cloruros que son solubles en agua bajo las condiciones de ensayo.

    1.2 El texto de esta norma cita notas y notas a pie de página las cuales brindan material explicativo. Esas notas y notas a pie de página no deben ser consideradas como requisitos de la norma.

    1.3 Los valores indicados en unidades SI o en unidades pulgada-libra deben ser considerados como los estándares. Dentro del texto, las unidades pulgada-libra se muestran entre corchetes. Los valores indicados en cada sistema no son exactamente equivalentes; por eso, cada sistema debe ser utilizado independientemente del otro.

    1.4 Esta norma no pretende tratar todos los temas de seguridad, si hubiera, asociados con su uso. Es responsabilidad del usuario de esta norma establecer prácticas apropiadas de seguridad y salud y determinar la aplicabilidad de las limitaciones regulatorias previo al uso.

    2. Documentos Citados

    C1084 Test Method for Portland-Cement Content of Hardened Hydraulic-Cement Concrete

    C114 Test Methods for Chemical Analysis of Hydraulic Cement

    C125 Terminology Relating to Concrete and Concrete Aggregates

    C42/C42M Test Method for Obtaining and Testing Drilled Cores and Sawed Beams of Concrete

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

    C823/C823M Practice for Examination and Sampling of Hardened Concrete in Constructions

    D1193 Specification for Reagent Water

    E11 Specification for Woven Wire Test Sieve Cloth and Test Sieves

    E832 Specification for Laboratory Filter Papers