1.1 本规程涵盖了水硬性水泥砂浆和混凝土的铸造、钻孔或锯切试样的制备和调节程序，以应对因外部施加力以外的原因导致的长度变化。如果需要，它可以很容易地适应涉及替代时间表或环境处理的长度变化研究。 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。每个系统中所述的值不一定是完全等效的；因此，为确保符合标准，每个系统应独立使用，两个系统的值不得组合。括号中显示了英寸-磅单位。 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。 1.4 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水硬性水泥砂浆和混凝土的铸造、钻孔或锯切试样因外部施加的力和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。这种做法对于比较评估不同砂浆或混凝土试样中的这种潜力特别有用。

1.1 This practice covers the procedures for the preparation and conditioning of cast, drilled, or sawed specimens of hydraulic-cement mortar and concrete for length change due to causes other than externally applied forces. It can be readily adapted, if desired, to studies of length change involving alternative schedules or environmental treatments. 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. The inch-pound units are shown in brackets. 1.3 The text of this standard refers 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. 1.4 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 cementitous 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 Measurements of length change permit assessment of the potential for volumetric expansion or contraction of cast, drilled, or sawed specimens of hydraulic-cement mortar, and concrete due to various causes other than externally applied forces and temperature changes. This practice is particularly useful for comparative evaluation of this potential in different mortar or concrete specimens.