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，以应对由于外力以外的原因引起的长度变化。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 以英寸-磅单位或国际单位表示的数值应单独视为标准值。每个系统中规定的单位可能不是精确的等价物；因此，每个系统必须相互独立使用，不得以任何方式组合。 英寸-磅单位显示在括号中。 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====== 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、钻孔或锯切试样因各种原因（除外力和温度变化外）产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可能性特别有用。

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 inch-pound units or SI units shall be regarded separately as standard. The units stated in each system may not be exact equivalents; therefore, each system must be used independently of the other, without combining in any way. The inch-pound units are shown in brackets. 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 ====== 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.