1、Standard Specification for Materials for Micro Surfacing AASHTO Designation: MP 28-171Technical 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
2、28-1 AASHTO Standard Specification for Materials for Micro Surfacing AASHTO Designation: MP 28-171Technical Section: 2a, Emulsified Asphalts Release: Group 3 (August 2017) 1. SCOPE 1.1. This standard covers requirements for emulsified asphalt, aggregate, mineral filler, and water used in micro surfa
3、cing. Micro surfacing is 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 295, Coal Fly Ash and Raw or Calcined Natural Pozzolan for Use in Concret
4、e M 303, Lime for Asphalt Mixtures M 316, Polymer-Modified Emulsified Asphalt PP 83, Micro Surfacing 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 Degradation of Small-Size Coarse Aggrega
5、te 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 Coarse Aggregate 2.2. NSF/ANSI Stan
6、dard: NSF/ANSI 60-2013, Drinking Water Treatment ChemicalsHealth Effects 3. TERMINOLOGY 3.1. Definitions: 3.1.1. CQS-1Pa cationic, quick-setting emulsified asphalt containing a polymer modifier. 3.1.2. CQS-1hPa cationic, quick-setting emulsified asphalt containing a polymer modifier and having a har
7、der asphalt residue. 2017 by the American Association of State Highway and Transportation Officials. All rights reserved. Duplication is a violation of applicable law.TS-2a MP 28-2 AASHTO 4. SIGNIFICANCE AND USE 4.1. This standard may be used to select and evaluate materials for the construction of
8、micro surfacing. The design recommendations for micro surfacing may be found in PP 83. 5. EMULSIFIED ASPHALT REQUIREMENTS 5.1. Emulsified asphalt for micro surfacing shall meet the requirements of CQS-1P or CQS-1hP in M 316. The emulsified asphalt classification, CQS-1P or CQS-1hP, is determined by
9、the Owner Agency utilizing regional climatic and traffic conditions. 6. AGGREGATE REQUIREMENTS 6.1. Mineral aggregate shall be 100 percent crushed on two 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
10、mm (No. 8) sieve is permitted. T 335 shall be used to determine the percentage of crushed aggregate. The quality requirements for the aggregates shall 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
11、Test Test Method Requirement Sand Equivalent, min T 176 65 Los Angeles Abrasion, %, maxaT 96 30 Magnesium Sulfate Soundness, max loss, %, 5 cycles T 104 20 Or 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,
12、 etc. from which it was derived. Table 2Aggregate Grading Requirements Sieve Size Type IaPercent Passing Type IIaPercent Passing Type IIIbPercent Passing Stockpile Tolerance % 9.5 mm(3/8 in.) 100 100 100 4.75 mm (No. 4) 100 90100 7090 5 2.36 mm (No. 8) 90100 6590 4570 5 1.18 mm (No. 16) 6590 4570 28
13、50 5 600 m (No. 30) 4065 3050 1934 5 300 m (No. 50) 2542 1830 1225 4 150 m (No. 100) 1530 1021 718 3 75 m (No. 200) 1020 515 515 2 aType I and II aggregates are typically used to fill surface voids, address surface distresses (scratch courses), seal, and provide a durable wearing surface. Type I is
14、finer and is used in residential areas and on airport runways. bType III aggregates are typically used to provide higher friction resistance and an improved wearing surface. It is appropriate for heavy traffic applications, for rut filling, or for placement on highly textured surfaces requiring larg
15、er size aggregate to fill voids. 6.2. When tested in accordance with T 11 and T 27, the mix design aggregate gradation shall comply with one of the gradations 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
16、by more than the stockpile tolerance, as indicated in Table 2, while also remaining within the 2017 by the American Association of State Highway and Transportation Officials. All rights reserved. Duplication is a violation of applicable law.TS-2a MP 28-3 AASHTO specifications gradations band. The pe
17、rcentage of aggregate passing 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, limest
18、one dust, fly ash, or other approved filler meeting the requirements of M 17, M 85, M 295, or M 303 shall be used if required by the mix design. Aluminum sulfate shall meet the requirements of NSF/ANSI 60. Typical mineral filler use levels are 0.5 to 3.0 percent by mass and may be considered part of
19、 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 submitted 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
20、 be used to accelerate or retard the break or set of the micro surfacing material. Appropriate additives such as emulsified chemicals, and their applicable use range, should be approved by the mix design laboratory as part of the mix design process. 10. KEYWORDS 10.1. Aggregate; cationic emulsified asphalt; micro surfacing; mineral filler. 1This provisional standard was first published in 2016. 2017 by the American Association of State Highway and Transportation Officials. All rights reserved. Duplication is a violation of applicable law.
