1.1 本规程涵盖4英寸混凝土的制备和压实。（101.6 mm）标称直径2.5 在里面(63.5 mm）高圆柱形沥青路面混合料样本。本规程适用于实验室和工厂生产的沥青混合料，骨料含量高达1 在里面(25.4 mm）沥青路面混合料样品的最大尺寸和重新压实。 注1: 从历史上看，本测试中每个面分别击打35次、50次和75次。 注2: 制造商不建议对样品的每个表面进行过多的锤击。众所周知，这种做法会导致机器部件疲劳和损坏。 1.2 使用的马歇尔压实设备有三种。本规程包括以下类型的液压锤布置: 1.2.1 手动锤柄（1型）通过弹簧连接到平整的压脚上- 负载旋转，手动操作（参见 5.3.1 )（美国陆军工程兵团制定的原始标准）。 1.2.2 锤柄横向约束（固定），但不垂直约束（类型2），通过弹簧加载旋转接头连接到平压脚上，可以机械或手动操作（参见 5.3.2 ). 锤柄顶部可能有或可能没有恒定的超载。机械锤（2型）可在55至68击/分钟的范围内工作。 1.2.3 锤柄横向约束（固定），在锤子顶部有或没有恒定过载，连接到旋转模架（类型3）上的倾斜压脚上，并进行机械操作（参见 5.3.3 ). 此方法必须用作裁判方法。 1.3 尽管每个装置的质量和质量下降高度相同，但相同锤击次数的压实试样中获得的密度将不同。 由业主或指定人确定与现场相关的压实试样所需的具体锤击次数。 1.4 单位- 以英寸-磅为单位的数值应视为标准值。括号中给出的值是到国际单位制的数学转换，仅供参考，不被视为标准值。 1.5 本标准的文本引用了提供解释材料的注释和脚注。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（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 通过该程序成型的压实沥青混合料样本用于各种物理测试，如稳定性、流动性、间接抗拉强度、疲劳、蠕变和模量。还对样本进行了密度和孔隙分析，用于混合料设计和现场压实评估。 注3: 未压实混合物用于测定理论最大比重。 注4: 本实践产生的结果质量取决于执行程序的人员的能力以及所用设备的能力、校准和维护。符合规范标准的机构 D3666 通常认为能够胜任和客观的测试、抽样、检查等。本规程的用户应注意遵守规范 D3666 单独使用并不能完全确保可靠的结果。可靠的结果取决于许多因素；遵循规范建议 D3666 或一些类似的可接受指南提供了评估和控制其中一些因素的方法。

1.1 This practice covers preparation and compaction of 4 in. (101.6 mm) diameter by nominal 2.5 in. (63.5 mm) high cylindrical asphalt paving mixture specimens. This practice is intended for use with laboratory and plant-produced asphalt mixtures with aggregate up to 1 in. (25.4 mm) maximum size and for recompaction of asphalt paving mixture samples. Note 1: Historically, 35, 50, and 75 blows per face has been practiced for this test. Note 2: Manufacturers do not recommend applying an excessive number of blows per face of a sample. This practice has been known to cause fatigue and damage to machine components. 1.2 There are three types of Marshall compaction apparatus in use. The following types of hammer arrangements are included in this practice: 1.2.1 Manually held hammer handle (Type 1) is attached to a flat compaction foot through a spring-loaded swivel and is hand operated (see 5.3.1 ) (original standard developed by the United States Army Corps of Engineers). 1.2.2 Hammer handle restrained laterally (fixed) but not vertically (Type 2), attached to a flat compaction foot through a spring-loaded swivel and is either mechanically or hand operated (see 5.3.2 ). There may or may not be a constant surcharge on top of the hammer handle. Mechanical hammers (Type 2) are available that operate at a range of 55 to 68 blows per minute. 1.2.3 Hammer handle restrained laterally (fixed) with or without constant surcharge on top of hammer, is attached to a slanted compaction foot on a rotating mold base (Type 3), and is mechanically operated (see 5.3.3 ). This method must be used as a referee method. 1.3 Although the mass and height of mass drop for each apparatus are the same, density achieved in compacted specimens with the same number of blows will be different. It is up to the owner or specifier to establish the specific required number of blows to be used for compaction of the specimen in relation to the field. 1.4 Units— The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. 1.5 The text of this standard references notes and footnotes which provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of the 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. ====== Significance And Use ====== 4.1 Compacted asphalt mixture specimens molded by this procedure are used for various physical tests such as stability, flow, indirect tensile strength, fatigue, creep, and modulus. Density and void analysis are also conducted on specimens for mixture design and evaluation of field compaction. Note 3: Uncompacted mixtures are used for determination of theoretical maximum specific gravity. Note 4: The quality of the results produced by this practice are dependent on the competence of the personnel performing the procedure and the capability, calibration, and maintenance of the equipment used. Agencies that meet the criteria of Specification D3666 are generally considered capable of competent and objective testing, sampling, inspection, etc. Users of this practice are cautioned that compliance with Specification D3666 alone does not completely ensure reliable results. Reliable results depend on many factors; following the suggestions of Specification D3666 or some similar acceptable guideline provides a means of evaluating and controlling some of those factors.