1、Standard Specification for Cutback Asphalt (Medium-Curing Type) AASHTO Designation: M 82-75 (2008) American Association of State Highway and Transportation Officials 444 North Capitol Street N.W., Suite 249 Washington, D.C. 20001TS-2a M 82-1 AASHTO Standard Specification for Cutback Asphalt (Medium-
2、Curing Type) AASHTO Designation: M 82-75 (2008) 1. SCOPE 1.1. This specification covers liquid petroleum products, produced by fluxing an asphaltic base with suitable petroleum distillates, to be used in the treatment of road surfaces. 1.2. The values stated in SI units are to be regarded as the sta
3、ndard. 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. 3. PROPERTIES 3.1. Cutback asphalt of the grade designated shall conform to the requirements shown in Table 1. 4. METHODS OF SAMPLI
4、NG AND TESTING 4.1. Sampling and testing cutback asphalt (medium-curing type) shall be in accordance with the following standard methods of the AASHTO and ASTM standards: T 40, Sampling Asphalt Materials T 44, Solubility of Bituminous Materials T 49, Penetration of Bituminous Materials T 51, Ductili
5、ty of Asphalt Materials T 72, Saybolt Viscosity T 78, Distillation of Cutback Asphaltic (Bituminous) Products T 79, Flash Point with Tag Open-Cup Apparatus for Use with Material Having a Flash Point Less Than 93.3C (200F) T 102, Spot Test of Asphaltic Materials T 201, Kinematic Viscosity of Asphalts
6、 (Bitumens) T 202, Viscosity of Asphalts by Vacuum Capillary Viscometer ASTM D 95, Water in Petroleum Products and Bituminous Materials by Distillation 2011 by the American Association of State Highway and Transportation Officials.All rights reserved. Duplication is a violation of applicable law.TS-
7、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 (140F) 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)
8、(150) (150) Water, percent 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 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
9、 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) (300) (1200) (300) (1200) (300) (1200) Ductility, 5 cm/min, cmc100 100 100 100 100 Solubility in trichloroethyl
10、ene, percent 99.0 99.0 99.0 99.0 99.0 Spot testdwith: Standard naphtha Negative for all grades Naphtha-xylene solvent, percent xylene Negative for all grades Heptane-xylene solvent, percent xylene Negative for all grades aAs an alternate, Saybolt-Furol viscosities may be specified as follows: Grade
11、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 (180F)100 to 200 s. Grade MC-3000Furol viscosity at 82.2C (180F)300 to 600 s. bIn lieu of viscosity of the re
12、sidue, 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 viscosity and penetration be required. cIf the ductility at 25C (77F) is less than 100, the material will
13、be acceptable if its ductility at 15.5C (60F) is more than 100. dThe 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. 2011 by the American Association of State Highway and Transportation Officials.All rights reserved. Duplication is a violation of applicable law.
