1.1 本试验方法测定含有水硬性水泥和级配标准砂的砂浆棒在干燥时的长度变化。 1.2 以国际单位制表示的数值应视为标准。当引用组合标准时，测量系统的选择由用户根据引用标准的要求自行决定。 1.3 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. 1.4 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。 ====意义和用途====== 4.1 该试验方法建立了一组选定的温度、相对湿度和环境蒸发率条件，规定成分的砂浆试样应在规定的时间内经受该条件，在此期间，其长度变化被确定并指定为“干燥收缩”。 “ 4.2 通过该试验方法测定的砂浆的干燥收缩与用相同水泥制成并暴露在相同干燥条件下的混凝土的干燥收缩呈线性关系。 4. 因此，当需要开发关于水硬性水泥对用该水泥制成的混凝土的干燥收缩的影响的数据时，可以使用该测试方法。

1.1 This test method determines the change in length on drying of mortar bars containing hydraulic cement and graded standard sand. 1.2 The values stated in SI units are to be regarded as standard. When combined standards are referenced, the selection of measurement system is at the user’s discretion subject to the requirements of the referenced standard. 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. Warning— Fresh hydraulic cementitious mixtures are caustic and may cause chemical burns to skin and tissue upon prolonged exposure). 2 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 ====== 4.1 This test method establishes a selected set of conditions of temperature, relative humidity and rate of evaporation of the environment to which a mortar specimen of stated composition shall be subjected for a specified period of time during which its change in length is determined and designated “drying shrinkage.” 4.2 The drying shrinkage of mortar as determined by this test method has a linear relation to the drying shrinkage of concrete made with the same cement and exposed to the same drying conditions. 4 Hence this test method may be used when it is desired to develop data on the effect of a hydraulic cement on the drying shrinkage of concrete made with that cement.