1.1 本规范涵盖天然水泥和速凝天然水泥。 注1: 天然水泥过去的典型用途包括砌块砂浆、水泥抹面、薄浆、粉刷和混凝土。 1.2 以国际单位制或英寸磅单位表示的数值应单独视为标准。每个系统中规定的值可能不是完全相等的；因此，每个系统应独立使用。将两个系统的值合并可能导致不符合标准。国际单位制[或英寸-磅单位]的数值应通过国际单位制（或英寸-英镑单位）的测量或适当的转换获得，使用中给出的转换和舍入规则 IEEE/ASTM SI 10 ，以其他单位[或国际单位制]进行的测量。当实际中不使用英寸磅单位时，数值仅以国际单位制表示。 1.3 本标准的文本引用了提供解释性材料的注释和脚注。 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 natural cement and quick-setting natural cement. Note 1: Examples of typical past uses of natural cement include unit masonry mortar, cement plaster, grout, whitewash, and concrete. 1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard. Values in SI units [or inch-pound units] shall be obtained by measurement in SI units [or inch-pound units] or by appropriate conversion, using the Rules for Conversion and Rounding given in IEEE/ASTM SI 10 , of measurements made in other units [or SI units]. Values are stated in only SI units when inch-pound units are not used in practice. 1.3 The text of this standard references notes and footnotes which provide explanatory material. 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.