1.1 本试验方法包括密度的测定（见 附注1 )并给出了计算混凝土屈服强度、水泥含量和空气含量的公式。产量是指由已知数量的组分材料混合而成的混凝土体积。 1.2 本测试方法的文本是指提供解释材料的注释和脚注。这些注释和脚注（不包括表格和图中的注释和脚注）不应被视为本试验方法的要求。 1.3 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可能不是完全等效的；因此，每个系统都应独立使用。 将两个系统的值结合起来可能会导致不符合标准。 注1: 单位重量是之前用于描述本试验方法确定的性能的术语，即单位体积的质量。 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。

1.1 This test method covers determination of the density (see Note 1 ) of freshly mixed concrete and gives formulas for calculating the yield, cement content, and air content of the concrete. Yield is defined as the volume of concrete produced from a mixture of known quantities of the component materials. 1.2 The text of this test method refers to 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 test method. 1.3 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. Note 1: Unit weight was the previous terminology used to describe the property determined by this test method, which is mass per unit volume. 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 cementitious 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.