1、Standard Specification for Cutback Asphalt (Medium-Curing Type) AASHTO Designation: M 82-17 Technical Section: 2a, Emulsified Asphalts Release: Group 3 (August 2017) American Association of State Highway and Transportation Officials 444 North Capitol Street N.W., Suite 249 Washington, D.C. 20001TS-2
2、a M 82-1 AASHTO Standard Specification for Cutback Asphalt (Medium-Curing Type) AASHTO Designation: M 82-17 Technical Section: 2a, Emulsified Asphalts Release: Group 3 (August 2017) 1. SCOPE 1.1. This specification covers liquid petroleum products, produced by fluxing an asphalt base with suitable p
3、etroleum distillates, to be used in the treatment of road surfaces. 1.2. The values stated in SI units are to be regarded as the standard. 2. GENERAL REQUIREMENTS 2.1. The cutback asphalt shall show no separation or curdling prior to use and shall not foam when heated to the application temperature.
4、 3. PROPERTIES 3.1. Cutback asphalt of the grade designated shall conform to the requirements shown in Table 1. 4. METHODS OF SAMPLING AND TESTING 4.1. Sampling and testing cutback asphalt (medium-curing type) shall be in accordance with the following AASHTO and ASTM standards: R 66, Sampling Asphal
5、t Materials T 44, Solubility of Bituminous Materials T 49, Penetration of Bituminous Materials T 51, Ductility of Asphalt Materials T 72, Saybolt Viscosity T 78, Distillation of Cutback Asphalt Products T 79, Flash Point with Tag Open-Cup Apparatus for Use with Material Having a Flash Point Less Tha
6、n 93C (200F) T 102, Spot Test of Asphaltic Materials T 201, Kinematic Viscosity of Asphalts (Bitumens) T 202, Viscosity of Asphalts by Vacuum Capillary Viscometer ASTM D95, Standard Test Method for Water in Petroleum Products and Bituminous Materials by Distillation 2017 by the American Association
7、of State Highway and Transportation Officials. All rights reserved. Duplication is a violation of applicable law.TS-2a M 82-2 AASHTO Table 1Minimum and Maximum Cutback Asphalt Grade Requirements MC-30 MC-70 MC-250 MC-800 MC-3000 Min Max Min Max Min Max Min Max Min Max Kinematic viscosity at 60C (140
8、F) mm2/sa30 60 70 140 250 500 800 1600 3000 6000 Flash point (tag open-cup), 38 38 66 66 66 C (F) (100) (100) (150) (150) (150) Water, % 0.2 0.2 0.2 0.2 0.2 Distillation test: Distillation, percentage by volume of total distillate to 360C (680F) to 225C (437F) 25 0 20 0 10 to 260C (500F) 40 70 20 60
9、 15 55 0 35 0 15 to 315C (600F) 75 93 65 90 60 87 45 80 15 75 Residue from distillation to 360C (680F), volume percentage of sample by difference 50 55 67 75 80 Tests on residue from distillation: Absolute viscosity at 60C (140F) Pas (P)b30 120 30 120 30 120 30 120 30 120 (300) (1200) (300) (1200) (
10、300) (1200) (300) (1200) (300) (1200) Ductility, 5 cm/min at 25C (77F), cm 100 100 100 100 100 Solubility in trichloroethylene, % 99.0 99.0 99.0 99.0 99.0 Spot testcwith: Standard naphtha Negative for all grades Naphtha-xylene solvent, % xylene Negative for all grades Heptane-xylene solvent, % xylen
11、e Negative for all grades aAs an alternate, Saybolt Furol viscosities may be specified as follows: Grade MC-30Furol viscosity at 25C (77F)75 to 150 s. Grade MC-70Furol viscosity at 50C (122F)60 to 120 s. Grade MC-250Furol viscosity at 60C (140F)125 to 250 s. Grade MC-800Furol viscosity at 82.2C (180
12、F)100 to 200 s. Grade MC-3000Furol viscosity at 82.2C (180F)300 to 600 s. bIn lieu of viscosity of the residue, the specifying agency, at its option, can specify penetration at 100 g, 5 s at 25C (77F) of 120 to 250 for Grades MC-30, MC-70, MC-250, MC-800, and MC-3000. However, in no case will both v
13、iscosity and penetration be required. cThe use of the spot test is optional. When specified, indicate whether the standard naphtha solvent, naphtha-xylene solvent, or heptane-xylene solvent will be used in determining compliance with the requirement, and also, in the case of the xylene solvents, the percentage of xylene to be used. 5. KEYWORDS 5.1. Cutback asphalt; medium curing. 2017 by the American Association of State Highway and Transportation Officials. All rights reserved. Duplication is a violation of applicable law.
