1.1 本试验方法包括测量固化和养护过程中的线性收缩，以及耐化学品砂浆、灌浆、整体表面处理和聚合物混凝土的热膨胀系数。 1.2 方形横截面的棒材在模具中铸造到规定的长度，模具中装有捕获在成品铸件末端的测量螺柱。 1.2.1 测量固化后长度的变化，并将其用于计算收缩率。 注1: 不应在含硫砂浆上进行收缩测定，因为该试验方法不能真正反映含硫砂浆的整体线性收缩。 1.2.2 测量特定升高温度下的长度变化，并用于计算热膨胀系数。 1.3 该试验方法仅限于骨料尺寸小于等于0.25英寸（6毫米）的材料。 1.4 以英寸-磅为单位的数值应视为标准。括号中给出的值是国际单位制的数学转换，仅供参考，不被视为标准。 1.5 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。 1.6 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 该试验方法提供了一种比较相对线性收缩和热膨胀系数的方法。 4.1.1 待测试的材料以流体或塑料状态放置在模具中。当材料过渡到固态时，它会粘附并捕获端部螺柱。 4.1.2 测量的线性收缩是指在材料足够刚性和足够坚固以移动螺柱后发生的长度变化。 4.2 该测试方法可用于研究目的，以提供测试材料中发生的线性变化的信息。 可能会发生其他尺寸变化，这些变化本身并不表现为长度变化。

1.1 This test method covers the measurement of the linear shrinkage during setting and curing and the coefficient of thermal expansion of chemical-resistant mortars, grouts, monolithic surfacings, and polymer concretes. 1.2 A bar of square cross-section is cast to a prescribed length in a mold that holds measuring studs that are captured in the ends of the finished casting. 1.2.1 The change in length after curing is measured and used to calculate shrinkage. Note 1: Shrinkage determinations should not be made on sulfur mortars, since this test method cannot truly reflect the overall linear shrinkage of a sulfur mortar. 1.2.2 The change in length at a specific elevated temperature is measured and used to calculate the coefficient of thermal expansion. 1.3 This test method is limited to materials with aggregate size of 0.25 in. (6 mm) or less. 1.4 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered 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. 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 offers a means of comparing the relative linear shrinkage and coefficient of thermal expansion. 4.1.1 The material to be tested is placed in the mold in a fluid or plastic state. As the material makes a transition to a solid state, it adheres to and captures the end studs. 4.1.2 The linear shrinkage measured is the change in length that occurs after the material is rigid enough and strong enough to move the studs. 4.2 This test method can be used for research purposes to provide information on linear changes taking place in the test materials. Other dimensional changes may occur that do not manifest themselves as changes in length.