1.1 本规程涵盖了各种铺路和相关用途的乳化沥青的选择。 1.2 以国际单位制表示的数值应视为标准值。本标准不包括其他计量单位。 1.3 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。 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 如规范所示 D977 和 D2397/D2397M ，乳化沥青按类型（快凝、中凝或慢凝）和类型内的等级（快凝类型的粘度或中凝和慢凝类型的残余沥青特性）分类。特定类型和等级的选择取决于施工类型（无论是应用还是混合类型）、矿物骨料的特性（级配和矿物成分）以及施工期间的环境条件。对于表面处理和密封，配制乳化沥青，使其在与矿物骨料或路面接触时快速凝固。当用于混合类型时，需要较慢的破碎速度，以留出时间进行混合和铺设。 如果混合骨料是开级配的，没有明显的细粒，则可以使用中凝乳化沥青沉积相对坚硬的沥青。如果骨料级配密实，但不包含大量极细材料（灰尘），则可能会选择具有软残渣的中凝乳化沥青。然而，如果密级配骨料包含大量极细矿物质，则可能需要慢凝乳化沥青。 4.2 中的建议 表1 应仅作为选择使用乳液的一般指南。如果用户不确定选择何种用途，应联系乳化沥青供应商。 （A） 有关本表中使用的术语的定义，请参阅第节 3. 或术语 D8 . （B） RS-1和CRS-1可在夜间施工或高湿度的特殊情况下用作粘结层。 （C） 如果经验表明乳化沥青的性能令人满意，则可以使用MS-2h以外的其他等级的乳化沥青。 （D） 制造商或承包商可根据州规定用水稀释。请参阅指定机构。

1.1 This practice covers the selection of emulsified asphalts for various paving and allied uses. 1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.3 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. 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 As indicated by Specifications D977 and D2397/D2397M , emulsified asphalts are classified by type (rapid, medium, or slow setting) and by grade within type (viscosity in the case of the rapid-setting type or characteristic of the residual asphalt in the case of the medium and slow-setting types). Selection for use of a particular type and grade is controlled by type of construction (whether an application or a mix type), properties of the mineral aggregate (both grading and mineral composition), and environmental conditions during construction. For surface treatments and seals, emulsified asphalts are formulated to set rapidly upon contact with the mineral aggregate or pavement surface. When used in mix types, slower breaking is required to allow time for mixing and laydown. If the mix aggregate is open graded without appreciable fines, a medium-setting emulsified asphalt may be used that deposits a relatively hard asphalt. If the aggregate is dense-graded but does not contain a large amount of very fine material (dust), a medium-setting emulsified asphalt with a soft residue may be a good choice. However, if the dense-graded aggregate contains a large amount of very fine mineral matter, a slow-setting emulsified asphalt may be required. 4.2 The recommendations in Table 1 should be considered only as a general guide for the selection of an emulsion for use. If the user is uncertain as to which to select for an intended use, the emulsified asphalt supplier should be contacted. (A) For definitions of terms used in this table, refer to Section 3 or Terminology D8 . (B) RS-1 and CRS-1 may be used as a tack coat in special cases where night construction or high humidity exists. (C) Grades of emulsified asphalt other than MS-2h may be used where experience has shown that they give satisfactory performance. (D) May dilute with water by manufacturer or contractor per state regulation. Refer to specifying agency.