1.1 本试验方法包括测定水蒸汽通过非成膜处理的速率，如硅烷、硅氧烷和应用于水泥基基材的硅烷/硅氧烷混合物。 1.2 本试验方法涵盖湿杯技术的使用，湿杯技术最接近这些材料使用的外部条件。如果买方和供应商之间达成一致，则可以使用其他条件。通过不同方法或测试条件获得的结果不应一致。 1.3 以国际单位制计量单位表示的数值被指定为标准。换算为英寸-磅单位的系数如所示 9.2.1.1 和 9.2.2.1 . 1.4 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。 1.5 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====== 4.1 影响水泥基处理性能的因素之一是水蒸汽通过水泥基处理的难易程度。因此，处理的水蒸气传输特性对于评估其实际使用性能非常重要。 4.2 本试验方法的目的是通过渗透性从高到低的处理获得水蒸汽传递值。这些值用于设计、制造和营销。 4.3 水蒸气透过率不是薄膜厚度、温度或相对湿度的线性函数。 4.4 水蒸气透过率值( WVT公司 )和水蒸汽渗透性( WVP )只有在相同的严格控制的温度和相对湿度条件下测试处理时，才能在处理的相对评级中使用。

1.1 This test method covers the determination of the rate at which water vapor passes through non film forming treatments, such as silanes, siloxanes and blends of silanes/siloxanes applied to cementitious substrates. 1.2 This test method covers the use of the wet cup technique, which most closely approaches the exterior conditions for use for these materials. Other conditions can be used if agreed upon between purchaser and supplier. Agreement should not be expected between results obtained by different methods or test conditions. 1.3 The values stated in SI units of measurement are designated as the standard. Factors for conversion to inch-pound units are given in 9.2.1.1 and 9.2.2.1 . 1.4 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. 1.5 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 ====== 4.1 One of the factors affecting the performance provided by a cementitious treatment is how readily water vapor passes through it. Hence, the water vapor transmission characteristics of treatments are important in assessing their performance in practical use. 4.2 The purpose of this test method is to obtain values of water vapor transfer through treatments that range in permeability from high to low. These values are for use in design, manufacture, and marketing. 4.3 Water vapor transmission is not a linear function of film thickness, temperature or relative humidity. 4.4 Values of water vapor transmission rate ( WVT ) and water vapor permeance ( WVP ) can be used in the relative rating of treatments only if the treatments are tested under the same closely controlled conditions of temperature and relative humidity.