1.1 本规范规定了混凝土中使用的细骨料和粗骨料（轻质或重质骨料除外）的级配和质量要求。 2 1.2 本规范供承包商、混凝土供应商或其他买方用作描述所提供材料的采购文件的一部分。 附注1: 本规范被认为足以确保大多数混凝土的材料令人满意。人们认识到，对于某些工作或在某些区域，它可能比需要的限制更多或更少。例如，在美观重要的情况下，可以考虑关于将污染混凝土表面的杂质的更严格的限制。指定者应确定指定的骨料在分级、物理或化学特性或其组合方面可在工作区域获得或可获得。1.3 本规范也用于项目规范中，以定义骨料的质量、骨料的标称最大尺寸以及其他特定的级配要求。负责选择混凝土混合物比例的人员应负责确定细骨料和粗骨料的比例，并在需要或批准时添加混合骨料尺寸。 1.4 以SI单位或英寸-磅单位表示的值应单独视为标准值。每个系统中陈述的值可能不完全等同；因此，每个系统应独立使用。合并两个系统的值可能导致不符合标准。 附注2: 筛子尺寸由质量标准中的标准名称标识 E11 括号中给出的替代名称仅供参考，并不代表不同的标准筛尺寸。 1.5 本标准的正文是指提供解释材料的注释和脚注。这些注释和脚注（不包括表格和图表中的注释和脚注）不应被视为本标准的要求。 1.6 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 specification defines the requirements for grading and quality of fine and coarse aggregate (other than lightweight or heavyweight aggregate) for use in concrete. 2 1.2 This specification is for use by a contractor, concrete supplier, or other purchaser as part of the purchase document describing the material to be furnished. Note 1: This specification is regarded as adequate to ensure satisfactory materials for most concrete. It is recognized that, for certain work or in certain regions, it may be either more or less restrictive than needed. For example, where aesthetics are important, more restrictive limits may be considered regarding impurities that would stain the concrete surface. The specifier should ascertain that aggregates specified are or can be made available in the area of the work, with regard to grading, physical, or chemical properties, or combination thereof. 1.3 This specification is also for use in project specifications to define the quality of aggregate, the nominal maximum size of the aggregate, and other specific grading requirements. Those responsible for selecting the proportions for the concrete mixture shall have the responsibility of determining the proportions of fine and coarse aggregate and the addition of blending aggregate sizes if required or approved. 1.4 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 2: 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. 1.5 The text of this standard 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 standard. 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.