1.1 本规程涵盖了获取交付至项目现场的新拌混凝土代表性样品的程序，在该项目现场将进行测试，以确定是否符合混凝土供应规范的质量要求( 注1 ). 实践包括从固定式、摊铺式和卡车式搅拌机、用于运输中央混合混凝土的搅拌和非搅拌设备以及规范中所述的连续搅拌设备中进行采样 C685/C685M . 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- 符合标准。 注1: 本规程要求复合样品，除非管理要进行的测试的程序特别例外，例如确定稠度均匀性和混合器效率的测试。本规程中未描述用于选择特定试验批次的程序，但建议使用随机抽样来确定总体规范符合性。 1.3 本规程还涵盖了制备混凝土样品的程序，以便在需要或有必要移除大于指定尺寸的骨料的情况下进行进一步测试。较大骨料颗粒的去除最好通过湿筛完成。 1.4 本标准的文本引用了注释和脚注，这些注释和脚注提供了解释性材料，不应视为本惯例的要求。 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）。本标准的用户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，长时间接触可能会导致皮肤和组织化学烧伤。 2. ) 1.6 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）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》中确立的国际公认标准化原则制定的。 ====意义和用途====== 3.1 本规程旨在提供从混凝土生产或运输中使用的不同容器中取样新拌混凝土的标准要求和程序。有关材料、混合物、空气含量、温度、试样数量、坍落度、结果解释以及精度和偏差的详细要求见具体试验方法。

1.1 This practice covers procedures for obtaining representative samples of fresh concrete as delivered to the project site on which tests are to be performed to determine compliance with quality requirements of the specifications under which the concrete is furnished ( Note 1 ). The practice includes sampling from stationary, paving and truck mixers, and from agitating and nonagitating equipment used to transport central-mixed concrete and from continuous mixing equipment as described in Specification C685/C685M . 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. Note 1: Composite samples are required by this practice, unless specifically excepted by procedures governing the tests to be performed such as tests to determine uniformity of consistency and mixer efficiency. Procedures used to select the specific test batches are not described in this practice, but it is recommended that random sampling be used to determine overall specification compliance. 1.3 This practice also covers the procedures to be used for preparing a sample of concrete for further testing where it is desirable or necessary to remove the aggregate larger than a designated size. This removal of larger aggregate particles is preferably accomplished by wet-sieving. 1.4 The text of this standard references notes and footnotes which provide explanatory material and shall not be considered as requirements of the practice. 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. ( Warning —Fresh hydraulic cementitious mixtures are caustic and may cause chemical burns to skin and tissue upon prolonged exposure. 2 ) 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 ====== 3.1 This practice is intended to provide standard requirements and procedures for sampling freshly mixed concrete from different containers used in the production or transportation of concrete. The detailed requirements as to materials, mixtures, air content, temperature, number of specimens, slump, interpretation of results, and precision and bias are in specific test methods.