1.1 本试验方法涵盖了确定由外部施加的力和温度变化以外的原因引起的长度变化，这些变化是在实验室制备的硬化水硬性水泥砂浆和混凝土试样在受控的温度和湿度条件下产生的。 1.2 以国际单位制或英寸-磅单位表示的值应单独视为标准值。骨料的筛孔尺寸和公称尺寸除外，其中SI值是规范中规定的标准 E11 每个系统中所述的值可能不是完全等效的；因此，每个系统都应独立使用。将两个系统的值结合起来可能会导致不符合标准。 1.3 本标准的文本是指提供解释性材料的注释和脚注。这些（不包括表和图中的）不应被视为标准的要求。 1.4 本标准并不旨在解决与其使用相关的所有安全问题（如果有的话）。 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，并确定监管限制的适用性。 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。 2. 1.5 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 长度变化的测量允许评估砂浆或混凝土因施加力或温度变化以外的各种原因而发生体积膨胀或收缩的可能性。该试验方法对于比较评估不同水硬性水泥砂浆或混凝土混合物中的这种潜力特别有用。 4.2 该测试方法为实验目的或需要在非标准混合、放置、处理或固化条件下进行测试的产品提供了有用的信息，例如高产品可加工性或不同的脱模时间。 标准条件见 5.4.1 . 4.3 如果需要本试验方法中规定以外的混合、养护、取样和储存条件，则应报告这些条件，但不应将其视为本试验方法的标准条件。非标准条件和偏离标准条件的原因应与比较值一起清楚、突出地报告。

1.1 This test method covers the determination of the length changes that are produced by causes other than externally applied forces and temperature changes in hardened hydraulic-cement mortar and concrete specimens made in the laboratory and exposed to controlled conditions of temperature and moisture. 1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. An exception is with regard to sieve sizes and nominal size of aggregate, in which the SI values are the standard as stated in Specification E11 . The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard. 1.3 The text of this standard refers notes and footnotes that provides explanatory material. These (excluding those in tables and figures) shall not be considered as requirements of the standard. 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. Warning— Fresh hydraulic cementitious mixtures are caustic and may cause chemical burns to skin and tissue upon prolonged exposure. 2 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 Measurement of length change permits assessment of the potential for volumetric expansion or contraction of mortar or concrete due to various causes other than applied force or temperature change. This test method is particularly useful for comparative evaluation of this potential in different hydraulic-cement mortar or concrete mixtures. 4.2 This test method provides useful information for experimental purposes or for products that require testing under nonstandard mixing, placing, handling, or curing conditions, such as high product workability or different demolding times. Standard conditions are described in 5.4.1 . 4.3 If conditions for mixing, curing, sampling, and storage other than specified in this test method are required, they shall be reported but are not to be considered as standard conditions of this test method. Nonstandard conditions and the reasons for departure from standard conditions shall be reported clearly and prominently with comparator values.