AASHTO T 260-97 (2020)

AASHTO T 260-97 (2020) 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.