1.1 本规范涵盖了用作抗冲刷外加剂的材料的资格鉴定，这些材料将被添加到水硬性水泥混凝土混合物中，以最大限度地减少水泥和其他细粒材料从水下浇筑的混凝土中的冲刷。 1.2 本规范中规定的试验结果用于鉴定材料是否为抗冲刷外加剂，而不是用于确定特定应用的剂量。 1.3 本规范提供了三个级别的测试。 1.3.1 级别1-- 外加剂符合本规范要求的初步证明（见 4.1 ). 1.3.2 级别2-- 有限的重新测试表明外加剂继续符合规范要求（见 4.2 ). 1.3.3 级别3-- 如果买方规定了批次验收，或测量批次内或批次之间的一致性（参见 4.3 ). 1.4 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。 1.5 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不一定是完全相等的；因此，为了确保符合标准，每个系统应独立使用，并且不得将两个系统的值组合使用。有些数值只有国际单位制，因为实际中没有使用英寸磅当量。 1.6 以下注意事项仅适用于试验方法章节 10 - 15 本规范的: 本标准并不旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 警告 新鲜的水硬性胶结混合物具有腐蚀性，长时间暴露可能会对皮肤和组织造成化学灼伤。 2. 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 covers the qualification of materials for use as anti-washout admixtures to be added to hydraulic-cement concrete mixtures for the purpose of minimizing washout of cement and other fine fractions of materials from concrete being placed underwater. 1.2 The results of the tests stipulated in this specification are to be used for the purpose of qualifying a material as an anti-washout admixture, and not for determination of dosage for specific applications. 1.3 This specification provides for three levels of testing. 1.3.1 Level 1— Initial proof of admixture compliance with the requirements of this specification (see 4.1 ). 1.3.2 Level 2— Limited retesting demonstrates continued conformity of the admixture with the requirements of the specification (see 4.2 ). 1.3.3 Level 3— If specified by the purchaser for acceptance of a lot, or for measuring uniformity within or between lots (see 4.3 ). 1.4 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. 1.5 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined. Some values have only SI units because the inch-pound equivalents are not used in practice. 1.6 The following precautionary caveat pertains only to test method Sections 10 - 15 of this specification: This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. Warning— Fresh hydraulic cementitious mixtures are caustic and may cause chemical burns to skin and tissue upon prolonged exposure. 2 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.