1.1本试验方法包括通过在净水泥试样上进行试验来测定水硬性水泥的高压釜膨胀。 1.2以国际单位制或英寸-磅单位表示的数值应单独视为标准值。每个系统中规定的值可能不是精确的等效值；因此，每个系统应相互独立使用。将两个系统的值合并可能会导致不符合标准。 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和健康实践，并确定监管限制的适用性。 有关具体的预防说明，请参阅安全预防措施一节。 ====意义和用途====== 高压釜膨胀试验提供了因水硬性水泥中存在CaO或MgO或两者的水化而引起的潜在延迟膨胀指数。

1.1 This test method covers determination of the autoclave expansion of hydraulic cement by means of a test on a neat cement specimen. 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 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 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 and health practices and determine the applicability of regulatory limitations prior to use. For specific precaution statements, see the section on Safety Precautions. ====== Significance And Use ====== The autoclave expansion test provides an index of potential delayed expansion caused by the hydration of CaO, or MgO, or both, when present in hydraulic cement.