AASHTO T 260-21涵盖了测定骨料、硅酸盐水泥、砂浆或混凝土的酸溶性氯离子含量或水溶性氯离子含量的程序。氯化物的总量通常等于酸溶性氯化物。然而，混凝土和混凝土原材料中可能存在含有酸不溶性氯化物的有机添加剂或矿物质。在混凝土或砂浆中长期暴露于碱性环境中时，这些成分可能会变得酸溶。取样时混凝土砂浆或水化硅酸盐水泥的龄期将对水溶性氯离子含量产生影响。因此，除非需要进行早期研究，否则建议在取样前至少28天对材料进行充分固化。

AASHTO T 260-21 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.