1.1 本文件提供了有关规范正确使用的指导 C270 和试验方法 C780 用于评估实验室和施工现场生产的砌筑砂浆。 1.2 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）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》中确立的国际公认标准化原则制定的。 ====意义和用途====== 3.1 本文件旨在为设计人员、规范人员、检查员、测试机构、生产商和用户提供指定和评估砌筑砂浆的指导和说明。 3.2 文件规范的用户 C270 和试验方法 C780 在指定或评估砌筑砂浆时，经常混淆，有时无意中误用两个文件的部分。本指南旨在解决规范中的特定项目 C270 和试验方法 C780 帮助促进其正确使用和解释。

1.1 This document provides guidance regarding the proper use of Specification C270 and Test Method C780 for evaluating masonry mortar produced in the laboratory and at the construction site. 1.2 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. ====== Significance And Use ====== 3.1 This document is intended to provide guidance and clarification to designers, specifiers, inspectors, testing agencies, producers, and users in specifying and evaluating masonry mortar. 3.2 Users of documents Specification C270 and Test Method C780 often confuse and sometimes inadvertently misuse parts of the two documents when specifying or evaluating masonry mortar. This guide seeks to address specific items within Specification C270 and Test Method C780 to help promote their proper use and interpretation.