1.1 本试验方法包括使用试验方法中所述的仪器测定新拌碾压混凝土（RCC）的密度和空气含量 C231/C231M 和试验方法中描述的振动锤 C1435/C1435米 。 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。每个系统中规定的值不一定是完全相等的；因此，为了确保符合标准，每个系统应独立使用，并且不得将两个系统的值组合使用。 注1: 筛网尺寸由其在规范中的标准名称确定 E11 括号中给出的备选名称仅供参考，不代表不同的标准筛尺寸。 1.3 本测试方法的文本引用了提供解释性信息的注释和脚注。 这些注释和脚注（不包括表和图中的注释和脚注）不应被视为本标准的要求。 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。 （警告——新鲜的水硬性胶结混合物具有腐蚀性，长时间暴露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。 ====意义和用途====== 4.1 该试验确定了新混合碾压混凝土的空气含量，不包括骨料颗粒内空隙内可能存在的任何空气。因此，它适用于用正常密度或高密度骨料颗粒制成的混凝土，并要求测定试验方法中所述的骨料校正系数 C231/C231M 。 4.2 如果正在测试的混凝土中含有可保留在50 毫米（2 in）筛，总混合物的空气含量仅通过试验近似。 4.3 该试验确定了含有最大粒径不大于50的新拌RCC骨料的密度 毫米（2 英寸）。 4.4 硬化碾压混凝土的密度和空气含量可能高于或低于该试验方法确定的密度和含气量。这取决于碾压混凝土的固结方法和固结力大小，硬化混凝土试样取自碾压混凝土； 新鲜碾压混凝土中气泡的均匀性和稳定性；显微镜检查的准确性（如果使用）；确定未硬化碾压混凝土的密度和空气含量的输送阶段；以及其他因素。

1.1 This test method covers the determination of density and air content of freshly mixed roller-compacted concrete (RCC) using the apparatus described in Test Method C231/C231M and the vibrating hammer described in Test Method C1435/C1435M . 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 are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined. Note 1: Sieve size is identified by its standard designation in Specification E11 . The alternative designation given in parentheses is for information only and does not represent a different standard sieve size. 1.3 The text of this test method references notes and footnotes that provide explanatory information. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of this standard. 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. ====== Significance And Use ====== 4.1 The test determines the air content of freshly mixed RCC exclusive of any air that may exist inside voids within aggregate particles. For this reason, it is applicable to concrete made with normal-density or high-density aggregate particles and requires determination of the aggregate correction factor described in Test Method C231/C231M . 4.2 If the concrete being tested contains aggregate that would be retained on a 50 mm (2 in.) sieve, the air content of the total mixture is only approximated by the test. 4.3 The test determines the density of freshly mixed RCC containing aggregate with a maximum size not greater than 50 mm (2 in.). 4.4 The density and air content of hardened RCC may be either higher or lower than that determined by this test method. This depends upon the methods and amount of consolidation effort applied to the RCC from which the hardened concrete specimen is taken; uniformity and stability of the air bubbles in the fresh RCC; accuracy of the microscopic examination, if used; stage in the delivery at which the density and air content of the unhardened RCC are determined; and other factors.