1.1 本规范涵盖了粉煤灰和未经加工或煅烧的天然火山灰，用于需要水泥或火山灰作用或两者兼而有之的混凝土中，或可能需要通常归因于粉煤灰或天然火山灰的其他财产，或实现这两个目标的混凝土中 . 注1: 细碎的材料可能会降低混凝土中夹带的空气含量。因此，如果将粉煤灰或天然火山灰添加到规定夹带空气的任何混凝土中，应采取措施确保通过空气含量测试和使用额外的引气外加剂或将引气外加剂与引气水硬性水泥结合使用来保持规定的空气含量。 1.2 以国际单位制表示的数值应视为标准。本标准不包括其他计量单位。 1.3 本标准的文本引用了注释和脚注，这些注释和脚注提供了解释性信息。这些注释和脚注（不包括表和图中的注释和脚注）不应被视为本标准的要求。 1.4 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。

1.1 This specification covers coal ash and raw or calcined natural pozzolan, for use in concrete where cementitious or pozzolanic action, or both, is desired, or where other properties normally attributed to coal ash or natural pozzolans may be desired, or where both objectives are to be achieved . Note 1: Finely divided materials may tend to reduce the entrained air content of concrete. Hence, if a coal ash or natural pozzolan is added to any concrete for which entrainment of air is specified, provision should be made to ensure that the specified air content is maintained by air content tests and by use of additional air-entraining admixture or use of an air-entraining admixture in combination with air-entraining hydraulic cement. 1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.3 The text of this standard references notes and footnotes, which provide explanatory information. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of the standard. 1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.