1.1 本规范适用于砌筑砂浆的外加剂。外加剂是规范以外的物质 C270 水、骨料和胶结材料的规定材料，用于改善传统砌筑砂浆的一种或多种公认的理想性能。 1.2 本规范不包括着色颜料。 注1: 有关着色颜料的信息，请参阅规范 C979/C979M 。 1.3 本规范不包括在胶结材料制造过程中添加到胶结材料中的添加剂。 1.4 外加剂的验收是基于其在混合砂浆中的性能。混合砌筑砂浆的验收是基于达到与传统砂浆所需的性能相当的性能或一种或多种指定性能的改进性能，同时保持其他性能所需的水平。 1.5 本标准的文本是指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。 1.6 以国际单位制表示的数值应视为标准。括号中给出的值仅供参考。 注2: 执行本规范中引用的测试方法的测试实验室应根据实践进行评估 C1093 。 1.7 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 pertains to admixtures for masonry mortars. Admixtures are substances other than Specification C270 prescribed materials of water, aggregate, and cementitious materials that are used to improve one or more of the recognized desirable properties of conventional masonry mortar. 1.2 This specification does not cover coloring pigments. Note 1: Information on coloring pigments can be found in Specification C979/C979M . 1.3 This specification does not cover additives that are added to the cementitious materials during the manufacture of the cementitious materials. 1.4 Acceptance of an admixture is based on its performance in an admixed mortar. Acceptance of the admixed masonry mortar is based on attainment of performance either equivalent to that required for conventional mortar or improved performance of one or more indicated properties, while maintaining required performance levels for other properties. 1.5 The text of this standard refers to notes and footnotes that provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of the standard. 1.6 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. Note 2: The testing laboratory performing the test methods referenced in this specification should be evaluated in accordance with Practice C1093 . 1.7 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.