This method covers procedures for the determination of the acid-soluble chloride ion content or the water-soluble chloride ion content of aggregates@ portland cement@ mortar or concrete. The total amount of chloride is usually equal to the acid-soluble chloride. However@ organic additives or minerals that contain acid-insoluble chloride may be present in concrete and concrete raw materials. These constituents may become acid soluble during long-term exposure to the alkaline environment in concrete or mortar. The age of concrete mortar@ or hydrated portland cement at the time of sampling will have an affect on the water-soluble chloride ion content. Therefore@ unless early age studies are desired@ it is recommended that the material be well cured and at least 28 days of age before sampling. This standard provides for the determination of chloride ion content by two procedures: Procedure A@ Determination of Acid-Soluble Chloride Ion Content and Water-Soluble Chloride Ion Content by Potentiometric Titration or Ion-Selective Electrode (Laboratory Test Method); and Procedure B@ Acid-Soluble Chloride Ion by Atomic Absorption (Laboratory Test Method). Sulfides are known to interfere with the determination of chloride content. Blast-furnace slag aggregates and cements contain sulfide sulfur in concentrations that can cause such interference@ which can be eliminated by treatment as noted in the test procedures. Other materials that produce a strong odor of H2S when acid is added to them should be similarly treated. The values stated in SI units are to be regarded as the preferred standard.
T 260-1997 history
2023T/CIET 260-2023 Hydrogen refueling station operation and management specifications
1997T 260-1997 Standard Method of Test for Sampling and Testing for Chloride Ion in Concrete and Concrete Raw Materials