AASHTO PP 53-09 (2011) 在新热拌沥青中使用再生沥青瓦时的设计考虑标准规范

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Standard Practice for

Design Considerations When Using

Reclaimed Asphalt Shingles (RAS)

in New Hot Mix Asphalt (HMA)

AASHTO Designation: PP 53-09 (2011)1

1. SCOPE

1.1. This recommended practice provides guidance for designing new hot mix asphalt (HMA) that

incorporates reclaimed asphalt shingles (RAS). Specific guidance includes design considerations,

how to determine the shingle aggregate gradation, how to determine the performance grade (PG)

and percentage of the virgin asphalt binder, and how to estimate the contribution of the shingle

asphalt binder to the final blended binder.

Note 1—Refer to MP 15 for information specifying the use of RAS in HMA. Additionally, refer

to the White Paper for Recycled Asphalt Shingle as an Additive in Hot Mix Asphalt for more

details concerning the origins and development of this recommended practice.

2. REFERENCED DOCUMENTS

2.1. AASHTO Standards:

 M 320, Performance-Graded Asphalt Binder

 M 323, Superpave Volumetric Mix Design

 MP 15, Use of Reclaimed Asphalt Shingles as an Additive in Hot Mix Asphalt (HMA)

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

 R 35, Superpave Volumetric Design for Hot Mix Asphalt (HMA)

 R 59, Recovery of Asphalt Binder from Solution by Abson Method

 T 30, Mechanical Analysis of Extracted Aggregate

 T 164, Quantitative Extraction of Asphalt Binder from Hot Mix Asphalt (HMA)

 T 209, Theoretical Maximum Specific Gravity (Gmm) and Density of Hot Mix Asphalt (HMA)

 T 308, Determining the Asphalt Binder Content of Hot Mix Asphalt (HMA) by the Ignition

Method

 T 319, Quantitative Extraction and Recovery of Asphalt Binder from Asphalt Mixtures

2.2. ASTM Standard:

 D 228/D 228M, Standard Test Methods for Sampling, Testing, and Analysis of Asphalt Roll

Roofing, Cap Sheets, and Shingles Used in Roofing and Waterproofing

2.3. Other Reference:

 White Paper for Recycled Asphalt Shingle as an Additive in Hot Mix Asphalt. University of

New Hampshire, Recycled Materials Resource Center, Project 13: Development and

Preparation of Specifications for Recycled Materials in Transportation Applications, 123

Nesmith Hall, Durham, NH, 2003.

TS-2d PP 53-1 AASHTO

Provided by IHS under license with AASHTO

Licensee=University of Texas Revised Sub Account/5620001114

Not for Resale, 05/28/2014 09:59:48 MDT

No reproduction or networking permitted without license from IHS

--`,,,`,`,`,``,`,,,,,,,`,`,``,`-`-`,,`,,`,`,,`---

3. INTRODUCTION

3.1. Although RAS has been used as an additive in HMA in the United States for more than 15 years,

it remains a relatively new application. As a result, there are design considerations that are not

generally known to the specification user. Four separate areas are addressed by this recommended

practice, with each elaborating on and providing recommendations relative to the following:

 Design Considerations When Using RAS in HMA

 Determining the Shingle Aggregate Gradation and Specific Gravity

 Estimating the Contribution of the Shingle Asphalt Binder to the Final Blended Binder in

New HMA (Values of F)

 Determining the Performance Grade (PG) and Percentage of the Virgin Asphalt Binder in

New HMA

4. DESIGN CONSIDERATIONS WHEN USING RAS IN NEW HMA

4.1. The introduction of shingle aggregate from RAS will affect the gradation properties of the new

HMA. The designer must determine the particle size and percentage of shingle aggregate present

and adjust the virgin aggregate composition, if necessary, to ensure that the new HMA meets the

appropriate gradation requirements.

4.2. The introduction of RAS will affect virgin asphalt binder content requirements. The designer must

determine the virgin asphalt binder content of the new HMA as part of the volumetric design

procedure.

4.3. During the production of the new HMA, shingle asphalt binder present in the RAS will mix with

the virgin asphalt binder to produce a final blended binder. The properties of the shingle asphalt

binder can be considerably different from those of virgin asphalt binder. If the quantity of virgin

asphalt binder is less than 70 percent by mass of the total binder, the properties (PG) of the final

blended binder may be measurably different from the design PG of the binder as specified by the

local jurisdiction. In addition, the size of the RAS can be expected to affect the percentage of

shingle asphalt binder that contributes to the final blended binder. For example, material that is

ground to a size passing a 12.5-mm (0.5-in.) sieve can be expected to release lower levels of

available shingle asphalt binder (20 to 40 percent) than RAS ground to a size passing a 4.75-mm

(No. 4) sieve (as much as 95 percent available). The designer must be prepared to adjust the PG of

the virgin asphalt binder to compensate for this effect.

4.4. The release of shingle asphalt binder into the virgin asphalt binder can result in reduced virgin

asphalt binder requirements. It is unlikely, however, that all of the shingle asphalt binder will

dissolve and blend with the virgin asphalt binder. Particles of undissolved shingle asphalt binder

may act like aggregate particles that require more virgin asphalt binder to accomplish coating.

Additionally, particles of shingle asphalt binder may absorb bituminous oils from the virgin

asphalt binder. The location in an HMA plant where RAS is introduced into new HMA can also

affect the binder blending process. This point of introduction must minimize damage to the RAS

from excess heat and maximize the softening of shingle asphalt binder to facilitate the blending of

the shingle asphalt binder with virgin asphalt binder.

5. DETERMINING THE SHINGLE AGGREGATE GRADATION AND

SPECIFIC GRAVITY

5.1. Collect a representative sample of RAS and proceed in accordance with R 59, T 164, or T 319 to

extract the shingle asphalt binder. The size of the sample should be such that the amount of

TS-2d PP 53-2 AASHTO

Provided by IHS under license with AASHTO

Licensee=University of Texas Revised Sub Account/5620001114

Not for Resale, 05/28/2014 09:59:48 MDT

No reproduction or networking permitted without license from IHS

--`,,,`,`,`,``,`,,,,,,,`,`,``,`-`-`,,`,,`,`,,`---

aggregate material recovered will meet the size requirements of the gradation procedure. Alternate

extraction methods, when it is not necessary to retain the shingle asphalt binder, are provided in

T 308 and ASTM D 228.

5.2. To determine the shingle aggregate gradation, it is suggested that the shingle fiber present in the

RAS be removed prior to testing the recovered aggregate in accordance with T 30. Because the

major portion of the shingle fiber will be retained on a 4.75-mm (No. 4) sieve, the fiber fabric can

be removed by tweezers or other appropriate method prior to grading the shingle aggregate during

the T 30 test procedure.

Note 2—Sieving the aggregate may liberate fiberglass or other fibers present in the RAS. The

amount of aggregate contributed by the RAS produces an almost negligible effect in the overall

mixture gradation. The following gradation, which approximates the composition of most types of

shingles, may be used as a standard gradation in lieu of determining the shingle aggregate

gradation:

Shingle Aggregate Gradation

Sieve Size Percent Passing by Mass

9.5 mm (3/8 in.) 100

4.75 mm (No. 4) 95

2.36 mm (No. 8) 85

1.18 mm (No. 16) 70

600 μm (No. 30) 50

300 μm (No. 50) 45

150 μm (No. 100) 35

75 μm (No. 200) 25

5.3. Determine the shingle aggregate specific gravity by determining the theoretical maximum specific

gravity (Gmm) of the RAS according to T 209 and calculating the effective specific gravity (Gse) of

the aggregate according to Equation 1. A fine spray of alcohol may help reduce surface tension to

allow fine particles to sink.

100

1.03

−

=⎛⎞

⎛⎞

−

⎜⎟

⎝⎠

(1)

where:

Gse = the effective specific gravity of the shingle aggregate;

Gmm = the theoretical maximum specific gravity of the RAS; and

Pbr = the percentage of shingle asphalt binder in the RAS by mass, percent.

Note 3—The absorption of most shingle aggregate is so low that little difference exists between

the bulk and apparent specific gravities. Therefore, the effective specific gravity of the shingle

aggregate may be substituted for the bulk specific gravity in subsequent calculations.

TS-2d PP 53-3 AASHTO

Provided by IHS under license with AASHTO

Licensee=University of Texas Revised Sub Account/5620001114

Not for Resale, 05/28/2014 09:59:48 MDT

No reproduction or networking permitted without license from IHS

--`,,,`,`,`,``,`,,,,,,,`,`,``,`-`-`,,`,,`,`,,`---

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标签： #标准规范

摘要：

了解 AASHTO PP 53-09 (2011) 标准规范，该标准针对在新热拌沥青混合料（HMA）中可持续使用再生沥青瓦（RAS）提供了关键设计考虑。该规范详细阐述了再生沥青瓦的材料 sourcing、性能等级要求以及掺量限制，旨在确保在利用废旧屋面材料降低成本和资源消耗的同时，维持路面的耐久性、抗车辙性与水稳定性。通过遵循这一指南，工程师和承包商可以有效平衡再生材料的利用率与混合料性能，从而在绿色施工与道路质量之间取得理想平衡。该标准适用于采用 tear-off 废瓦或 manufactur

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