1、Standard Specification for Materials for Emulsified Asphalt Chip Seals AASHTO Designation: MP 27-16 (2018)1Technical Section: 5b, Bridge and Pavement Preservation Release: Group 1 (April) American Association of State Highway and Transportation Officials 444 North Capitol Street N.W., Suite 249 Wash
2、ington, D.C. 20001 TS-5b MP 27-1 AASHTO Standard Specification for Materials for Emulsified Asphalt Chip Seals AASHTO Designation: MP 27-16 (2018)1Technical Section: 5b, Bridge and Pavement Preservation Release: Group 1 (April) 1. SCOPE 1.1. A chip seal is an application of emulsified asphalt, follo
3、wed immediately by an application of a single layer of cover aggregate. 1.2. This standard specifies quality requirements for aggregate and emulsified asphalt for chip seals with an option for a fog seal. 2. REFERENCED DOCUMENTS 2.1. AASHTO Standards: M 140, Emulsified Asphalt M 208, Cationic Emulsi
4、fied Asphalt M 316, Polymer-Modified Emulsified Asphalt 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 Aggregate by Abrasion and Impact in the Los Angeles Machine
5、 T 335, Determining the Percentage of Fracture in Coarse Aggregate 2.2. Federal Lands Highway (FLH) Standard: FLH T 508, Flakiness Index Value 3. TERMINOLOGY 3.1. Definitions: 3.1.1. CSS-1ha cationic emulsified asphalt that is slow-setting and hard (for fog seals only). 3.1.2. SS-1han anionic emulsi
6、fied asphalt that is slow-setting and hard (for fog seals only). 3.1.3. rapid-setting type emulsified asphaltany emulsified asphalt containing the CRS, CHFRS, HFRS, or RS designation as referenced in M 140, M 208, or M 316. 2018 by the American Association of State Highway and Transportation Officia
7、ls. All rights reserved. Duplication is a violation of applicable law.TS-5b MP 27-2 AASHTO 4. SIGNIFICANCE AND USE 4.1. This standard specification may be used to select and evaluate materials for the construction of emulsified asphalt chip seals. 5. EMULSIFIED ASPHALT REQUIREMENTS 5.1. Emulsified a
8、sphalt for chip seals shall meet the requirements of rapid-setting type emulsified asphalt in M 140, M 208, or M 316. 5.2. The emulsified asphalt residue hardness classification is determined by the Owner Agency utilizing regional climatic and traffic conditions. 5.3. An emulsified asphalt fog seal
9、may be applied to the surface of the completed chip seal as an option. Fog seal emulsified asphalt may be an SS-1h or CSS-1h emulsified asphalt. The fog seal emulsified asphalt shall be diluted at the emulsion manufacturing terminal prior to application such that the residue of the diluted emulsion
10、is not less than 28 percent. 6. AGGREGATE REQUIREMENTS 6.1. Chip seal aggregate shall be durable, uniform in quality, and free from deleterious materials. Gradations and quality requirements are specified in Table 1. All percentages are by mass. The aggregate size to be used will be as specified by
11、the Owner Agency. Aggregate retained on the 4.75-mm (No. 4) screen shall be crushed by mechanical means and shall meet the requirements shown in Table 2. Table 1Requirements for Chip Seal Aggregates Sieve Size (see T 11 or T 27) Passing, % A B C Da3/4in. 100 1/2in. 90100 100 3/8in. 530 90100 100 100
12、 No. 4 010 530 90100 065 No. 8 010 530 015 No. 16 02 010 010 No. 30 02 No. 50 02 06 No. 200 01 01 01 03 aLimit use to Class I chip seals as defined in Table 2. Table 2Fracture and Abrasion Requirements for Chip Seal Aggregates Property Chip Seal ClassaI II III Fracture, 1 Face, % min (see T 335) 70
13、85 95 Fracture, 2 Faces, % min (see T 335) 60 80 90 Los Angeles Abrasion, max % loss (see T 96) 40 35 30 Flakiness Index Value, max % (see FLH T 508) 35 30 25 aClass I is less than 500 AADT; Class II is 5015000 AADT; and Class III is greater than 5000 AADT. 2018 by the American Association of State
14、Highway and Transportation Officials. All rights reserved. Duplication is a violation of applicable law.TS-5b MP 27-3 AASHTO 7. KEYWORDS 7.1. Aggregate; chip seals; emulsified asphalt; fog seal. 1This provisional standard was first published in 2016. 2018 by the American Association of State Highway and Transportation Officials. All rights reserved. Duplication is a violation of applicable law.
