AASHTO M 156-13

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Standard Specification for

Requirements for Mixing Plants for

Hot-Mixed, Hot-Laid Bituminous

Paving Mixtures

AASHTO Designation: M 156-13

American Association of State Highway and Transportation Officials

444 North Capitol Street N.W., Suite 249

Washington, D.C. 20001

TS-2c M 156-1 AASHTO

Standard Specification for

Requirements for Mixing Plants for Hot-Mixed,

Hot-Laid Bituminous Paving Mixtures

AASHTO Designation: M 156-13

1. SCOPE

1.1. This specification covers requirements for plants producing hot mix asphalt (HMA) or warm mix

asphalt (WMA) paving mixtures. It may be used as a basis for state certification or inclusion of an

asphalt mixing plant on an agency’s approved list. Additional requirements may also be specified

by the agency.

2. REFERENCED DOCUMENTS

2.1. AASHTO Standards:

 R 66, Sampling Asphalt Materials

 T 19M/T 19, Bulk Density (“Unit Weight”) and Voids in Aggregate

 T 27, Sieve Analysis of Fine and Coarse Aggregates

 T 30, Mechanical Analysis of Extracted Aggregate

 T 84, Specific Gravity and Absorption of Fine Aggregate

 T 166, Bulk Specific Gravity (Gmb) of Compacted Hot Mix Asphalt (HMA) Using Saturated

Surface-Dry Specimens

 T 168, Sampling Bituminous Paving Mixtures

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

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

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

Method

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

Superpave Gyratory Compactor

3. TERMINOLOGY

3.1. batch plant—a manufacturing facility for producing asphalt paving mixtures in discrete

production batches. Each batch includes specific proportions, by weight, of aggregate, asphalt

binder, and other chosen additives. Each discrete batch is mixed and then discharged.

3.2. check—a specific type of inspection or measurement performed on equipment or materials to

indicate compliance with the stated criteria. Examples include (a) lime check, and (b) calibration

check of cold feed system.

3.3. continuous mix plant—a manufacturing facility for producing asphalt paving mixtures that

continuously proportions the aggregate, asphalt binder, and other chosen additives into the mix by

a continuous volumetric proportioning system without definite batch intervals.

TS-2c M 156-2 AASHTO

3.4. drum mix plant—a manufacturing facility for producing asphalt paving mixtures that continuously

proportions the aggregate, heats and dries it in a rotating drum, adds any chosen additives, and

simultaneously mixes the material with a controlled amount of asphalt binder.

3.5. hot mix plant—any of the plants listed above that produce HMA or WMA.

3.6. interlock—a system whereby plant production will be interrupted when any one of the interlocked

raw material constituents fails to meet the targeted requirements established within the

specifications or plant requirements.

3.7. modified batch plant—a manufacturing facility for producing asphalt paving mixtures that

continuously proportions the aggregate, asphalt binder, and other chosen additives into the mix by

weighted batches. The modified batch plant will usually have the screen decks removed.

4. PLANT REQUIREMENTS

4.1. Prerequisite for Plant Approval:

4.1.1. Inspection of Equipment—The plant owner or manager shall schedule an inspection of the plant

facilities to determine compliance with this specification. The equipment shall be maintained in a

satisfactory operating condition and be capable of its intended function at all times during

production.

4.1.2. Quality Control Program—Each plant shall have an approved quality control program and have a

designated person to administer the program. This program shall include the testing and control of

the individual component materials and the final product produced at the plant. Operations shall be

conducted in a manner so that a uniform product is produced that will meet specified

requirements.

4.1.3. Certified Public Weighers or Certified Public Scales—State or federal requirements should dictate

plant requirements related to Certified Public Weighers or Certified Public Scales.

4.1.4. Uniformity—The plant must be capable of producing homogenous asphalt mixtures even though

the individual components include such diverse materials as various sizes of aggregate from

stockpiles, reclaimed asphalt pavement (RAP), reclaimed asphalt shingles (RAS), asphalt binder,

and other admixtures, as required by the mix design.

4.2. Weight Measuring Systems:

4.2.1. Furnish (at the contractor’s expense) platform scales to weigh bulk asphalt plant mixtures,

regardless of the type of weight measuring system used for payment.

4.2.2. Ensure that the documentation for platform scales complies with state or federal requirements.

Platform scales shall be certified at a minimum every six months, or at a frequency required by

state or federal requirements. Platform scales shall be certified if they are moved or relocated.

4.2.3. Each platform scale system should be capable of taring truck weights with each load.

4.2.4. When not using platform scales, provide calibrated weighing devices that record the mixture’s net

weight delivered to the truck. Weighing devices shall be calibrated at a frequency specified by the

state. The weight of produced mixture should be verified periodically by platform scales. A net

weigh system will include, but is not limited to, the following:

4.2.4.1. Hopper or batcher-type weigh system that delivers asphalt mixture directly to the truck.

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摘要：

AASHTO M 156-13 is a key standard specification from the American Association of State Highway and Transportation Officials that covers the requirements for granular material used as subbase or base course in highway construction and soil stabilizati

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