1、Standard Specification for Materials for Slurry Seal AASHTO Designation: MP 32-171Technical 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 MP 32-1
2、 AASHTO Standard Specification for Materials for Slurry Seal AASHTO Designation: MP 32-171Technical Section: 2a, Emulsified Asphalts Release: Group 3 (August 2017) 1. SCOPE 1.1. This standard covers requirements for emulsified asphalt, aggregate, mineral filler, water, and additive materials used in
3、 slurry seals. Slurry seals are mixed and placed on existing pavement surfaces using specially designed paving machines. 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 Aspha
4、lt M 295, Coal Fly Ash and Raw or Calcined Natural Pozzolan for Use in Concrete M 303, Lime for Asphalt Mixtures PP 87, Slurry Seal Design T 11, Materials Finer Than 75-m (No. 200) Sieve in Mineral Aggregates by Washing T 27, Sieve Analysis of Fine and Coarse Aggregates T 96, Resistance to Degradati
5、on of Small-Size Coarse Aggregate by Abrasion and Impact in the Los Angeles Machine T 104, Soundness of Aggregate by Use of Sodium Sulfate or Magnesium Sulfate T 176, Plastic Fines in Graded Aggregates and Soils by Use of the Sand Equivalent Test T 335, Determining the Percentage of Fracture in Coar
6、se Aggregate 2.2. ANSI Standard: NSF/ANSI 60-2013, Drinking Water Treatment Chemicals-Health Effects 3. TERMINOLOGY 3.1. CQS-1Ha cationic, quick-setting emulsified asphalt. 4. SIGNIFICANCE AND USE 4.1. This standard may be used to select and evaluate materials for the construction of slurry seal. Th
7、e design recommendations for slurry seal may be found in PP 87. 2017 by the American Association of State Highway and Transportation Officials. All rights reserved. Duplication is a violation of applicable law.TS-2a MP 32-2 AASHTO 5. EMULSIFIED ASPHALT REQUIREMENTS 5.1. Emulsified asphalt for slurry
8、 seal shall meet the requirements of CQS-1h in M 208. Alternate emulsified asphalt classifications may be specified by the Owner Agency utilizing regional climatic and traffic conditions as well as local nomenclature. 6. AGGREGATE REQUIREMENTS 6.1. Mineral aggregate shall be 100 percent crushed on t
9、wo or more faces for the coarse aggregate material retained on the 2.36 mm (No. 8) sieve. Only manufactured fine aggregate, material passing the 2.36 mm sieve (No. 8), is permitted. T 335 shall be used to determine the percentage of crushed aggregate. The quality requirements for the aggregates shal
10、l be in accordance with Table 1. The grading of the aggregate in Table 2 shall be specified by the Owner Agency. Table 1Aggregate Quality Requirements Test Test Method Requirement Sand Equivalent, min T 176 45 Los Angeles Abrasion, %, maxaT 96 35 Magnesium Sulfate Soundness, max loss, %, 5 cycles T
11、104 20 Sodium Sulfate Soundness, max loss, %, 5 Cycles T 104 15 a The abrasion test is to be run on the parent aggregate, i.e. limestone, sandstone, etc. from which it was derived. Table 2Aggregate Grading Requirements Sieve Size Type IIaPercent Passing Type IIIbPercent Passing Stockpile Tolerance %
12、 9.5 mm(3/8 in) 100 100 4.75 mm (No. 4) 90100 70 90 5 2.36 mm (No. 8) 6590 4570 5 1.18 mm (No. 16) 4570 2850 5 600 m (No. 30) 3050 1934 5 330 m (No. 50) 1830 1225 4 150 m (No. 100) 1021 718 3 75 m (No. 200) 515 515 2 aType II aggregates are typically used to fill surface voids, address surface distr
13、esses (scratch courses), seal, and provide a durable wearing surface. bType III aggregates are typically used to provide higher friction resistance and an improved wearing surface. 6.2. When tested in accordance with T 11 and T 27 the mix design aggregate gradation shall comply with one of the grada
14、tions in Table 2 or one designated by the Owner Agency. 6.3. The gradation of the aggregate stockpile shall not vary from the mix design gradation by more than the stockpile tolerance, indicated in Table 2, while also remaining within the specifications gradation band. The percentage of aggregate pa
15、ssing any two successive sieves shall not change from one end of the specified range to the other end. 7. MINERAL FILLER 7.1. Mineral filler may be used to improve mixture consistency and to adjust mixture breaking and curing properties. Portland cement, hydrated lime, limestone dust, fly ash, or ot
16、her approved filler meeting the requirements of M 17, M 85, M 295, or M 303 shall be used if required by the mix 2017 by the American Association of State Highway and Transportation Officials. All rights reserved. Duplication is a violation of applicable law.TS-2a MP 32-3 AASHTO design. Aluminum sul
17、fate shall meet the requirements of NSF/ANSI 60. Typical mineral filler use levels are 0 to 3.0 percent by mass and may be considered part of the aggregate gradation. 8. WATER 8.1. Water shall be free of harmful salts and contaminants. If the quality of the water is in question, it should be submitt
18、ed to the mix design laboratory for analysis along with the other raw materials to be used in the mix design. 9. ADDITIVES 9.1. Additives may be used to accelerate or retard the break or set of the slurry seal material. Appropriate additives such as emulsified chemicals, and their applicable use ran
19、ge, should be approved by the mix design laboratory as part of the mix design process. 10. KEYWORDS 10.1. Emulsified asphalt; mineral aggregate; 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.
