1.1 本试验方法规定了通过部分浸没测定材料吸水系数的程序。其范围是评估与地面以上正常或驱动雨水接触的建筑材料由于毛细力而产生的吸水率。该程序通常主要适用于砌体材料、灰泥或涂层与基材的组合；但它也可以用于绝缘材料。本试验方法仅适用于均质材料，不适用于复合材料或非均质材料（例如，表面刚性闭孔绝缘）。在以下情况下确定液体吸收现象不在本标准范围内- 等级申请。吸水系数主要用作建筑围护结构中热量和水分联合传输的数值模拟输入数据，用于设计和法医调查目的。 1.2 以国际单位制或英寸-磅单位表示的数值应单独视为标准值。每个系统中规定的值不一定是精确的等价物；因此，为确保符合本标准，每个系统应独立使用，且两个系统的值不得组合。然而，可以使用适当的转换因子将导出的结果从一个系统转换到另一个系统（参见 表1 ). 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 这些试验的目的是通过简单的仪器获得可靠且易于确定的毛细管活性材料液态水传输值，以合适的单位表示。 这些值用作建筑围护结构设计和取证研究的湿热分析工具中材料特性的一部分。由于多孔材料中液体传输现象的主题非常复杂，ISO 15148中的附录X1显示了一些更详细的背景信息。

1.1 This test method defines a procedure to determine the water absorption coefficient of a material by partial submersion. The scope is to evaluate the rate of absorption of water due to capillary forces for building materials in contact with normal or driving rain above grade. The procedure is typically suitable mainly for masonry material, plaster, or a coating in combination with a substrate; but it can also be used for insulation materials. This test method is designed to be used only on homogeneous materials and does not apply to materials that are composites or non-homogeneous (for example, Faced Rigid Closed-cell Insulation). It is not within the scope of this standard to determine liquid uptake phenomena in below-grade applications. The water absorption coefficient is mainly used as an input datum for numerical simulation of the combined heat and moisture transport in building envelopes for design and forensic investigation purposes. 1.2 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. However, derived results can be converted from one system to the other using appropriate conversion factors (see Table 1 ). 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 The purpose of these tests is to obtain, by means of simple apparatus, reliable and easy to determine values of liquid water transport for capillary active materials expressed in suitable units. These values are for use as part of the material properties in hygrothermal analysis tools for building envelope design and forensic studies. As the topic of liquid transport phenomena in porous materials is very complex, Appendix X1 in ISO 15148 shows some more detailed background information.