AASHTO PP100_20

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Standard Practice for

Ultrathin Bonded Wearing

Course Design

AASHTO Designation: PP 100-201

Technical Subcommittee: 5b, Bridge and

Pavement Preservation

Release: Group 1 (April)

American Association of State Highway and Transportation Officials

555 12th Street NW, Suite 1000

Washington, DC 20004

Accessed by account: University of Michigan | Date: Sun Jan 17 14:22:18 2021 | IP address: 141.213.172.10

TS-5b PP 100-1 AASHTO

Standard Practice for

Ultrathin Bonded Wearing Course Design

AASHTO Designation: PP 100-201

Technical Subcommittee: 5b, Bridge and

Pavement Preservation

Release: Group 1 (April)

1. SCOPE

1.1. This standard practice for ultrathin bonded wearing course includes a mix design evaluation for

the asphalt surface mixture, usually 1/2 to 1 in. (12.5 to 25.4 mm) thick, to determine the

proportions of polymer-modified emulsified asphalt that is used as the tack coat, PG binder,

mineral aggregate, mineral filler, and additives to produce an ultrathin bonded wearing course job-

mix formula.

2. REFERENCED STANDARDS

2.1. AASHTO Standards:

 M 295, Coal Fly Ash and Raw or Calcined Natural Pozzolan for Use in Concrete

 M 303, Lime for Asphalt Mixtures

 M 316, Polymer-Modified Emulsified Asphalt

 M 320, Performance-Graded Asphalt Binder

 M 332, Performance-Graded Asphalt Binder Using Multiple Stress Creep Recovery (MSCR)

Test

 MP 44, Materials for Ultrathin Bonded Wearing Course

 R 30, Mixture Conditioning of Hot Mix Asphalt (HMA)

 T 59, Emulsified Asphalts

 T 209, Theoretical Maximum Specific Gravity (Gmm) and Density of Asphalt Mixtures

 T 269, Percent Air Voids in Compacted Dense and Open Asphalt Mixtures

 T 283, Resistance of Compacted Asphalt Mixtures to Moisture-Induced Damage

 T 305, Determination of Draindown Characteristics in Uncompacted Asphalt Mixtures

 T 312, Preparing and Determining the Density of Asphalt Mixture Specimens by Means of the

Superpave Gyratory Compactor

3. SIGNIFICANCE AND USE

3.1. The procedure described in this standard practice is used to produce an ultrathin bonded wearing

course. The materials used in the design of ultrathin bonded wearing course can be found in

MP 44.

Accessed by account: University of Michigan | Date: Sun Jan 17 14:22:18 2021 | IP address: 141.213.172.10

TS-5b PP 100-2 AASHTO

4. EVALUATION OF MATERIALS

4.1. Evaluate the aggregate, polymer-modified emulsified asphalt, mineral filler, and performance-

graded asphalt binder in accordance with the requirements of MP 44.

5. DESIGN PROCESS

5.1. Job-Mix Formula:

5.1.1. The job-mix formula, JMF, shall be determined for the ultrathin bonded wearing course mixture

prepared in a mix design laboratory that has been approved by the owner agency.

5.1.2. The JMF shall state the maximum particle size in the mixture, the mixture gradation, the total

aggregate bulk specific gravity, the maximum and bulk specific gravity of the ultrathin bonded

wearing course mixture, and the application rate for any anti-stripping additives.

5.2. Mix Design:

5.2.1. The binder content and the percentage of aggregate passing each sieve shall be in accordance with

the requirements in Table 1.

Table 1—Binder Content and Aggregate Gradation Guidelines for the Asphalt Surface Mixturea

Mixture Designation—Control Point (Percent Passing)

Sieve Size

in. (12.5 mm)

in. (9.5 mm)

No. 4 (4.75 mm)

in. (19.0 mm)

100.0

—

1/2 in. (12.5 mm)

85–100

100

—

3/8 in. (9.5 mm)

55–80

85–100

100

No. 4 (4.75 mm)

22–38

40.0–55

No. 8 (2.36 mm)

19–32

20–32

No. 16 (1.18 mm)

15–24

No. 30 (600 µm)

11–18

No. 50 (300 µm)

8–14

No. 100 (150 µm)

5–10

No. 200 (75 µm)

4.0–5.5

Binder Content, %

4.6–6.1

4.8–6.1

5.0–6.3

Recommended Placement Rate (lb/yd2)

a Placement rates are based on 100 lb/yd2/in. using a mixture with a specific gravity of 2.5. Mixtures with different specific gravity will

require an adjusted equivalent placement rate.

Note 1—The information provided in Table 1 for binder content and gradation are guidelines.

Many agencies have used ultrathin bonded wearing course over time and have developed their

specifications or special provisions to meet their specific conditions.

5.2.2. Other requirements for the ultrathin bonded wearing course include the following:

5.2.2.1. The maximum specific gravity of the ultrathin bonded wearing course mixture shall be mass

determined in water in accordance with T 209.

5.2.2.2. Draindown from the loose mixture shall not exceed 0.10 percent when tested in accordance with

T 305.

5.2.2.3. The tensile strength ratio, TSR, shall meet or exceed 80 percent when tested in accordance with

T 283. Specimens for T 283 shall be 6 in. (150 mm) in diameter by 33/4 ± 1/4 in. (95.25 mm ±

6.35 mm) in height and compacted in accordance with T 312, except the specimens shall be

Accessed by account: University of Michigan | Date: Sun Jan 17 14:22:18 2021 | IP address: 141.213.172.10

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摘要：

AASHTO PP100_20 是由美国国家公路与运输协会（AASHTO）发布的2020年版标准规范，全称为“Standard Practice for Evaluation and Selection of Asphalt Binders for Hot Mix Asphalt”。该标准提供了评估和选择热拌沥青用沥青结合料的系统性流程，涵盖试验方法、性能分级（PG）要求及材料适用性判断准则，旨在提升路面材料的耐久性与施工质量。本规范适用于公路工程、市政道路及机场跑道等沥青路面设计与施工，帮助工

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