AASHTO PP 87-2017 Standard Practice for Slurry Seal Design.pdf

1、Standard Practice for Slurry Seal Design AASHTO Designation: PP 87-171Technical 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. 20001 TS-2a PP 87-1 AASHTO Stan

2、dard Practice for Slurry Seal Design AASHTO Designation: PP 87-171Technical Section: 2a, Emulsified Asphalts Release: Group 3 (August 2017) 1. SCOPE 1.1. This standard practice for mix design evaluation uses mixture properties to determine the proportions of emulsified asphalt, mineral aggregate, wa

3、ter, mineral filler, and additives to produce a slurry seal job-mix formula. 2. REFERENCED DOCUMENTS 2.1. AASHTO Standards: M 17, Mineral Filler for Bituminous Paving Mixtures M 85, Portland Cement M 208, Standard Specification for Cationic Emulsified Asphalt M 295, Coal Fly Ash and Raw or Calcined

4、Natural Pozzolan for Use in Concrete M 303, Lime for Asphalt Mixtures MP 32, Materials for Slurry Seal 2.2. ANSI Standard: NSF/ANSI 60-2013, Drinking Water Treatment ChemicalsHealth Ef fects 2.3. ISSA Standards: ISSA TB 100, Test Method for Wet Track Abrasion of Slurry Surfacing Systems ISSA TB 106,

5、 Measurement of Slurry Seal Consistency ISSA TB 109, Test Method for Measurement of Excess Asphalt in Bituminous Mixtures by Use of a Loaded Wheel Tester and Sand Adhesion ISSA TB 113, Test Method for Determining Mix Time for Slurry Surfacing Systems ISSA TB 114, Test Method for Wet Stripping of Cur

6、ed Slurry Surfacing Mixtures ISSA TB 139, Test Method to Determine Set and Cure Development of Slurry Surfacing Systems by Cohesion Tester 3. SIGNIFICANCE AND USE 3.1. The procedure described in this standard practice is used to evaluate a slurry seal job-mix formula. 2017 by the American Associatio

7、n of State Highway and Transportation Officials. All rights reserved. Duplication is a violation of applicable law.TS-2a PP 87-2 AASHTO 4. EVALUATION OF MATERIALS 4.1. Evaluate the aggregate in accordance with MP 32. 4.2. Evaluate the emulsified asphalt in accordance with the requirements for CQS-1h

8、 in M 208. 4.3. Evaluate the mineral filler in accordance with M 17 for bituminous mineral filler, M 85 for cement, M 295 for fly ash, M 303 for lime, and NSF/ANSI 60 for aluminum sulfate. 4.4. Water shall be free of harmful salts and contaminants. If the quality of the water is in question, it shou

9、ld be submitted to the mix design laboratory for analysis along with the other raw materials to be used in the mix design. 5. DESIGN PROCESS 5.1. Evaluate mix formulations for system performance using the tests, methods, and requirements outlined in Table 1. Table 1Evaluation of Slurry Seal Performa

10、nce Test ISSA Technical Bulletin Requirement Mix Time 25C (77F) TB 113 Controllable to 180 s, min Slurry Seal Consistency TB 106 2.0-3.0 cm (0.79-1.18 in.) Wet Cohesion (for quick traffic systems) TB 139 30 min (Set) 12 kg-cm, min 60 min (Traffic) 20 kg-cm or Near Spin, min Wet Stripping TB 114 Pass

11、 (90% min) Wet-Track Abrasion Loss TB 100 1-h Soak 807 g/m2(75 g/ft2), max Excess Asphalt by LWT Sand Adhesion TB 109 538 g/m2(50 g/ft2), max 6. DETERMINING MIX TIME 6.1. Determine the mix time in accordance with ISSA TB 113 and the requirements of Table 1. Emulsified asphalt percentages should resu

12、lt in mixture residual binder contents of 5.5 to 10.5 percent. 7. DETERMINING SLURRY SEAL CONSISTENCY 7.1. Determine the mixture consistency in accordance with ISSA TB 106 and the requirements of Table 1. 8. DETERMINING SET AND CURE CHARACTERISTICS (TRAFFIC READINESS) 8.1. Determine the initial set

13、and cure development characteristics in accordance with ISSA TB 139 and the requirements of Table 1. 2017 by the American Association of State Highway and Transportation Officials. All rights reserved. Duplication is a violation of applicable law.TS-2a PP 87-3 AASHTO 9. DETERMINING BINDER CONTENT 9.

14、1. The minimum binder content is determined by excessive mixture loss in accordance with ISSA TB 100 and the requirements of Table 1. In general, select 1 percent more emulsified asphalt (at 62 percent residue) from TB 100 with a tolerance of 0.5 percent emulsified asphalt during placement. 9.2. The

15、 maximum binder content is determined in accordance with ISSA TB 109 and the requirements of Table 1. 10. DETERMINING ASPHALT-TO-AGGREGATE COMPATIBILITY 10.1. Evaluate the potential of the mixture for stripping in accordance with the reported test results of ISSA TB 114 and the requirements of Table

16、 1. 11. REPORT 11.1. Report all test results from Sections 4, 6, 7, 8, and 9. 11.2. Report the recommended mix formulation including proportions of all mixture components and appropriate tolerances. 12. KEYWORDS 12.1. Emulsified asphalt; mineral filler; slurry seal. 1This provisional standard was first published in 2017. 2017 by the American Association of State Highway and Transportation Officials. All rights reserved. Duplication is a violation of applicable law.