1.1 本试验方法基于浸水后的吸水率，评估清水拒水剂对水硬性水泥砂浆试样的有效性。 1.2 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。 1.3 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户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。 1.4 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====== 5.1 硅质碱性基质易受水损害，可能导致劣化。 拒水剂可以保护暴露在水中的硅质碱性基质。本试验方法用于评估透明拒水剂在碱性基质上的功效。

1.1 This test method evaluates the effectiveness of clear water repellents on hydraulic cement mortar specimens based on water absorption after a water soak. 1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. 1.3 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. 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. ====== Significance And Use ====== 5.1 Siliceous alkaline substrates are subject to water damage that may result in deterioration. Water repellents can provide protection of siliceous alkaline substrates exposed to water. This test method is used to evaluate the efficacy of clear water repellents on alkaline substrates.