1、 Standard Specification for Materials for Asphalt Tack Coat AASHTO Designation: MP 36-181Technical Section: 2a, Emulsified Asphalts Release: Group 3 (August) American Association of State Highway and Transportation Officials 444 North Capitol Street N.W., Suite 249 Washington, D.C. 20001 TS-2a MP 36
2、-1 AASHTO Standard Specification for Materials for Asphalt Tack Coat AASHTO Designation: MP 36-18 Technical Section: 2a, Emulsified Asphalts Release: Group 3 (August) 1. SCOPE 1.1. This standard specifies quality requirements for emulsified asphalt or performance-graded asphalt binder for tack coats
3、. 1.2. A tack coat is the application of an emulsified asphalt or performance-graded (PG) asphalt binder, to an existing pavement surface just prior to placement of a pavement overlay course. The tack coat is used to ensure a good bond between an existing asphalt or concrete pavement and a pavement
4、overlay course, between multiple pavement lifts of a structural pavement, and at any vertical surfaces to which a new pavement layer will be placed adjacent, such as curbs, gutters, utilities, and construction joints. 2. REFERENCED DOCUMENTS 2.1. AASHTO Standards: M 140, Emulsified Asphalt M 208, Ca
5、tionic Emulsified Asphalt M 316, Polymer-Modified Emulsified Asphalt M 320, Performance-Graded Asphalt Binder M 332, Performance-Graded Asphalt Binder Using Multiple Stress Creep Recovery (MSCR) Test PP 93, Asphalt Tack Coat Design 3. ASPHALT REQUIREMENTS 3.1. Use an emulsified asphalt type or perfo
6、rmance-graded asphalt binder designated by the purchasing agency. Note 1When using emulsified asphalt, select either cationic or anionic emulsified asphalt. Cationic and anionic emulsified asphalt cannot be used together. Note 2Cationic emulsified asphalts are often recommended for areas with damp p
7、avement, such as coastal areas, because they are less sensitive to moisture and temperature. 3.2. Use slow-setting, medium-setting, rapid-setting, or quick-setting emulsified asphalt meeting the requirements in M 140, M 208, or M 316. The test requirement and associated specification limits for the
8、cement mixing test are waived for emulsified asphalt following dilution. Use performance-graded asphalt binder meeting the requirements of M 320 or M 332. 2018 by the American Association of State Highway and Transportation Officials. All rights reserved. Duplication is a violation of applicable law
9、.TS-2a MP 36-2 AASHTO Note 3Many agencies use “special purpose” tack coat materials that yield much higher bond strengths, reduce tracking, and allow a tack coat material to be applied at much higher rates. Examples include hot-applied materials, non-tracking tack coats, and tack coats applied throu
10、gh a spray paver. These applications may be proprietary and should be specified through local agency standards. 3.3. When using a slow-setting emulsified asphalt, dilute by adding one part additional water (1:1), unless otherwise specified by the purchasing agency. 3.4. Do not dilute rapid-setting o
11、r quick-setting emulsified asphalt for tack coat applications, unless otherwise specified by the purchasing agency. Provide a final product that is a fluid and homogeneous material that does not plug distributor nozzles. 3.5. Design the asphalt tack coat according to PP 93. Note 4For emulsified asph
12、alt, the rate of setting depends upon the type of emulsified asphalt, the amount of water added, the type and concentration of the emulsifying agent, and atmospheric conditions. 4. KEYWORDS 4.1. Emulsified asphalt; performance-graded asphalt binder, PG asphalt binder; tack coat. 2018 by the American Association of State Highway and Transportation Officials. All rights reserved. Duplication is a violation of applicable law.
