1.1 本试验方法用于测定水硬性水泥基砂浆和灰泥的保水性。 1.2 本试验方法提供了基于砂浆流动的保水性值，而试验方法 C1922 通过直接失水提供保水值。 1.3 以SI单位表示的值将被视为标准值。本标准不包括其他计量单位。当本测试方法涉及组合单元标准时，测量系统的选择由用户自行决定。 2 1.4 本试验方法的正文参考了提供解释材料的注释和脚注。这些注释和脚注（不包括表格和图表中的注释和脚注）不应被视为本标准的要求。 1.5 本标准并不旨在解决与其使用相关的所有安全性问题（如果有）。本标准的使用者有责任在使用前建立适当的安全、健康和环境实践并确定法规限制的适用性。 ( 警告 -新鲜的水硬性水泥混合物具有腐蚀性，长时间接触可能会对皮肤和组织造成化学灼伤。） 3 1.6 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》中确立的国际公认的标准化原则制定的。 ======意义和用途====== 4.1 该试验方法提供了一种测定砂浆和灰泥在吸力下保持水分的能力的方法。测试结果可用于确定是否符合质量标准。 4.2 使用该测试方法获得的结果可用于比较砂浆和灰泥在吸力下保持水分的相对能力。 4.3 当与砌筑单元一起使用时，使用该砌筑砂浆测试方法获得的结果不一定表明保水程度，因为单元吸收的水量取决于砌筑单元的吸收速率。 4.4 使用该石膏(灰泥)测试方法获得的结果不一定指示当石膏作为第二涂层施加在先前施加的石膏底漆表面上时的保水程度，因为从第二层石膏吸收的水量取决于底漆的吸收速率。当石膏作为涂层应用于砖石单元时也是如此。

1.1 This test method provides for the determination of water retention of hydraulic cement-based mortars and plasters. 1.2 This test method provides a water retention value based on mortar flow, while Test Method C1922 provides a water retention value via direct water loss. 1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. When this test method refers to combined-unit standards, the selection of the measurement systems is at the user’s discretion. 2 1.4 The text of this test method references notes and footnotes that provide explanatory material. These notes and footnotes, excluding those in tables and figures shall not be considered as requirements of this standard. 1.5 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.) 3 1.6 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 This test method provides a means for determining the ability of mortars and plasters to retain water under suction. Test results may be used to determine compliance with specifications. 4.2 The results obtained using this test method can be used to compare the relative ability of mortars and plasters to retain water under suction. 4.3 The results obtained using this test method for masonry mortars do not necessarily indicate the degree of water retention when used with masonry units, since the amount of water absorbed by the unit depends on the rate of absorption of the masonry unit. 4.4 The results obtained using this test method for plasters (stucco) do not necessarily indicate the degree of water retention when the plaster is applied as a second coat on the surface of a previously applied plaster base coat, since the amount of water absorbed from the second coat of plaster depends on the rate of absorption of the base coat. This is also true when a plaster is applied as a coating on masonry units.