1.1当原因不是测量混凝土构件的尺寸公差时，本试验方法包括确定从混凝土结构钻取的芯的长度。 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。在文本中，英寸-磅单位显示在括号中。每个系统中规定的值不是精确的等价物；因此，每个系统应相互独立使用。 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。 ====意义和用途====== 本试验方法提供了两个程序，用于确定沿其轴线测量的岩芯长度。该长度与长度-直径关系、条件调查、吸收、密度和孔隙分析、岩相学、水泥含量分析和其他应用结合使用。 它不符合确定两个平行表面之间距离的要求，这代表了通常用于确定是否符合试验方法C 174概述的设计规范的结构元件的厚度 .

1.1 This test method covers the determination of the length of a core drilled from a concrete structure when the reason is other than measuring dimensional tolerances of concrete elements. 1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. Within the text, the inch-pound units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system shall be used independently of the other. 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. ====== Significance And Use ====== This test method provides two procedures for determining the length of a core as measured along its axis. This length is used in conjunction with length to diameter relationships, condition surveys, absorption, density and voids analysis, petrography, cement content analysis, and other applications. It does not meet requirements for determining the distance between two parallel surfaces, which represents the thickness of a structural element often used to establish compliance with design specifications as outlined by Test Method C 174 .