1、Standard Specification for Cationic Emulsified Asphalt AASHTO Designation: M 208-18 Technical 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. 20001TS-2a M 208-1 AAS
2、HTO Standard Specification for Cationic Emulsified Asphalt AASHTO Designation: M 208-18 Technical Section: 2a, Emulsified Asphalts Release: Group 3 (August) 1. SCOPE 1.1. This specification covers 12 grades of cationic emulsified asphalt for use in pavement construction in the manner designated. Not
3、e 1See M 140 for specifications covering emulsified asphalt other than cationic and M 316 for specifications covering polymer-modified emulsified asphalt. 1.2. The values stated in SI units are to be regarded as the standard. 2. REFERENCED DOCUMENTS 2.1. AASHTO Standards: M 140, Emulsified Asphalt M
4、 316, Polymer-Modified Emulsified Asphalt R 5, Selection and Use of Emulsified Asphalts R 66, Sampling Asphalt Materials R 77, Certifying Suppliers of Emulsified Asphalt T 49, Penetration of Bituminous Materials T 51, Ductility of Asphalt Materials T 59, Emulsified Asphalts T 111, Mineral Matter or
5、Ash in Asphalt Materials T 382, Determining the Viscosity of Emulsified Asphalt by a Rotational Paddle Viscometer 3. REQUIREMENTS 3.1. Upon receipt, refer to T 59 for the proper protocol for conditioning the emulsified asphalt prior to mixing and testing. The emulsified asphalt should appear to be h
6、omogeneous after thorough mixing. Complete testing of sample for emulsified asphalt properties within 14 days of the sample date. Complete testing for emulsified asphalt residue properties within 30 days of the emulsified asphalt sample date. Note 2Dilution of the emulsified asphalt to aid in the fi
7、eld application of the material should not occur without approval of the buyer. 3.1.1. If the emulsified asphalt appears to be inhomogeneous after reconditioning and mixing according to T 59, discard and resample for testing if required by the buyer. 2018 by the American Association of State Highway
8、 and Transportation Officials. All rights reserved. Duplication is a violation of applicable law.TS-2a M 208-2 AASHTO Note 3When emulsified asphalts (in particular, rapid-setting grades) are held in containers at ambient temperature for an extended period, emulsified asphalt droplets can coalesce, l
9、eading to unrepresentative changes in emulsified asphalt liquid properties. Coalescence can also lead to sieve development and, ultimately, destabilization of the emulsified asphalt. This can be noted as overall inhomogeneity of the sample even after careful reheating and mixing upon receipt. 3.1.2.
10、 If the sample was subject to freezethaw cycling prior to receipt, discard and resample for testing. If the emulsified asphalt was frozen at any time before testing, results for emulsified asphalt liquid properties such as viscosity, sieve, and settlement will be invalid. Note 4Emulsified asphalt re
11、sidue properties can also be affected when the liquid emulsified asphalt to be recovered shows signs of inhomogeneity or has been subjected to freezethaw cycling. Note 5If the emulsified asphalt appears inhomogeneous or is suspected of having been subjected to freezethaw cycling prior to testing and
12、 a second, representative sample cannot be obtained, actual emulsified asphalt performance at time of construction should be reviewed. If sample integrity issues persist, consider deploying R 77 so that liquid emulsified asphalt samples are taken directly from heated storage tanks and are evaluated
13、soon after cooling directly to the required test temperature. 3.2. Emulsified asphalt shall conform to the requirements in Table 1 for the type and grade specified. 2018 by the American Association of State Highway and Transportation Officials. All rights reserved. Duplication is a violation of appl
14、icable law.TS-2a M 208-3 AASHTO Table 1Requirements and Typical Applications for Cationic Emulsified Asphalta Type Rapid Setting Grade CRS-1h CRS-1 CRS-1s CRS-2h CRS-2 CRS-2s Min Max Min Max Min Max Min Max Min Max Min Max Tests on emulsified asphalt: Viscosity, Saybolt Furol at 50C (122F), sb,c20 1
15、00 20 100 20 100 100 400 100 400 100 400 Or Viscosity, Rotational Paddle at 50C (122F), mPasb,c40 200 40 200 40 200 200 800 200 800 200 800 Storage stability test, 24 h, %b ,c1.0 1.0 1.0 1.0 1.0 1.0 Demulsibility, 35 mL, 0.08% Sodium dioctyl sulfosucinate, %b40 40 40 40 40 40 Particle charge testbPo
16、sitive Positive Positive Positive Positive Positive Sieve test, %b, c0.10 0.10 0.10 0.10 0.10 0.10 Distillation: Oil distillation, by volume of emulsified asphalt, % 3 3 3 3 3 3 Residue, %d60 60 60 65 65 65 Tests on residue from distillation: Penetration, 25C (77F), 100 g, 5 s, 0.1 mm 40 90 90 150 1
17、50 250 40 90 90 150 150 250 Ductility, 25C (77F), 5 cm/min, cm 40 40 40 40 40 40 Ash content, % 1 1 1 1 1 1 aRefer to R 5 for typical applications. bThe test requirement and associated specification limits are waived for emulsified asphalt products following dilution. cThis test requirement on repre
18、sentative samples may be waived if successful application of the material has been achieved in the field. d For emulsified asphalts that are diluted, the percent residue requirements must be adjusted accordingly. Continued on next page. 2018 by the American Association of State Highway and Transport
19、ation Officials. All rights reserved. Duplication is a violation of applicable law.TS-2a M 208-4 AASHTO Table 1Requirements for Cationic Emulsified Asphalta(Continued) Type Quick Setting Medium Setting Slow Setting Grade CQS-1h CQS-1 CMS-2h CMS-2 CSS-1h CSS-1 Min Max Min Max Min Max Min Max Min Max
20、Min Max Tests on emulsified asphalt: Viscosity, Saybolt Furol at 25C (77F), sb,c20 100 20 100 20 100 20 100 Or Vicsocity, Rotational Paddle at 25C (77F), mPasb,c40 200 40 200 40 200 40 200 Viscosity, Saybolt Furol at 50C (122F), sb,c50 450 50 450 Or Viscosity, Rotational Paddle at 50C (122F), mPasb,
21、c100 900 100 900 Storage stability test, 24 h, %b ,c1.0 1.0 1.0 1.0 Particle charge testbPositive Positive Positive Positive Positive Positive Sieve test, %b, c0.10 0.10 0.10 0.10 0.10 0.10 Cement mixing test, % 2.0 2.0 Distillation: Oil distillation, by volume of emulsified asphalt, % 12 12 Residue
22、, %d62 62 65 65 57 57 Tests on residue from distillation: Penetration, 25C (77F), 100 g, 5 s, 0.1 mm 40 90 90 250 40 90 90 250 40 90 90 250 Ductility, 25C (77F), 5 cm/min, cm 40 40 40 40 40 40 Ash content, % 1 1 1 1 1 1 aRefer to R 5 for typical applications. bThe test requirement and associated spe
23、cification limits are waived for emulsified asphalt products following dilution. cThis test requirement on representative samples may be waived if successful application of the material has been achieved in the field. d For emulsified asphalts that are diluted, the percent residue requirements must
24、be adjusted accordingly. 2018 by the American Association of State Highway and Transportation Officials. All rights reserved. Duplication is a violation of applicable law.TS-2a M 208-5 AASHTO 4. SAMPLING 4.1. Take samples of emulsified asphalt in accordance with R 66. 4.2. Store samples in clean, ai
25、rtight sealed plastic containers at a temperature of not less than 4C (39F) until tested. 5. METHODS OF TEST 5.1. Determine the properties of the emulsified asphalts given in Table 1 in accordance with T 59. Determine the emulsified asphalt viscosity as given in Table 1 in accordance with the Rotati
26、onal Paddle method in T 382 or by the Saybolt Furol method in T 59, as appropriate. Determine the properties of the emulsified asphalt residue in accordance with T 49, T 51, or T 111, as appropriate. 6. KEYWORDS 6.1. Cationic emulsified asphalt; emulsified asphalt; quick setting; rapid setting; slow setting. 2018 by the American Association of State Highway and Transportation Officials. All rights reserved. Duplication is a violation of applicable law.
