1.1 本指南涵盖了露天级配摩擦层（OGFC）工厂沥青混合料的施工。应采用最终用途规范，以符合工作和用户要求。适用时，规范 D3666 应至少用于机构测试和检查道路和铺路材料。 1.2 沥青OGFC被用作高速公路和机场的最终磨耗层。 1.3 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不符合标准。 1.4 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====== 4.1 本指南提供了信息，以帮助工程师了解铺设开放式级配摩擦层（OGFC）表层的设计要求和施工指南。OGFC主要用于通过为移动车轮负载下的地表水提供逃生路线，提高沥青路面的防滑性和耐磨性。沥青混合料通常含有少量细骨料颗粒和高空隙率，以提供一个相互连接的空隙通道，使水分从人行道排出。沥青的漆膜厚度和总沥青含量对于更好的抗剥落性、耐久性和老化性能非常重要。 注1: OGFC也可用于降低轮胎-路面界面噪声，也可用于减少反射裂缝的发生和严重程度。

1.1 This guide covers the construction of open-graded friction course (OGFC) plant asphalt mixtures. End-use specifications should be adopted to conform to job and user requirements. Where applicable, Specification D3666 should be applied as a minimum for agencies testing and inspecting road and paving materials. 1.2 Asphalt OGFCs are placed as the final wearing course for highways and airfields. 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 nonconformance with the standard. 1.4 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 This guide provides information to assist engineers with the design requirements and construction guidelines for paving an open-graded friction course (OGFC) surface layer. An OGFC is primarily used to improve the skid resistance and wear resistance of an asphalt pavement by providing an escape route for surface water beneath a moving wheel load. The asphalt mixture is typically produced with a low amount of fine aggregate particles and high air void content to provide a passageway of interconnected voids for moisture to drain away from the travelway. The film thickness of the asphalt and overall asphalt content are important for better stripping resistance and durability and aging properties. Note 1: OGFCs may also be placed to reduce the tire-pavement interface noise and may also be placed to reduce the occurrence and severity of reflective cracking.