GB1 Brovold Gyratory Compactor

The GB1 Brovold Gyratory Compactor


Pine Test Equipment, Inc.'s GB1 Brovold Superpave Gyratory Compactor compacts hot mix asphalt specimens at a constant consolidation pressure, a constant angle of gyration, and a fixed speed of gyration. Customers love the GB1 compactor for its portability and ruggedness.


Weighing 304 pounds, the GB1 Brovold is completely self-contained and ideal for onsite testing and mobile labs. Roll it into the bed of a pickup truck or into a van and take it anywhere. The integrated industrial computer controls the compaction of the specimen from start to finish, making the operation of this gyratory very simple.


New!  Touchscreen controls.


Standards Compliance:

The Operation Manual:  Request a Digital Copy


Available Logbook Sheets for Download:

Technical Support and Service:

Pine Gyratory Comparison:

Click here for a comparison of the GB1 and the G2 Pine Superpave gyratory compactors.


Available Upgrade:

Transfer data to a USB stick and print to a PCL laser printer from your GB1 serial number 5642 or lower with a data logger.  This upgrade is included in GB1's with a serial number of 5643 or higher.

Power Requirements: 

AFGB1A: 115 VAC(±10%), 15Amp, 60 Hz, 1 ph

AFGB1C: 230 VAC(±10%), 10 Amp, 50/60 Hz, 1 ph


760 mm wide x 540 mm deep x 1410 mm high

(30.0 inch x 21.3 inch x 55.4 inch)


Approximately 138 kg (304 lb)

Applied Pressure:

600 ±5 kPa

Note:  The applied pressure is fixed.

Angle of Gyration:

0.82± 0.02° or 1.16± 0.02° Internal Angle or 1.25± 0.02° External Angle

Specify at the time of order.

Note:  The angle of gyration is fixed.

Speed of Gyration:

30 ±0.5  gyrations per minute, factory set

Adjustable range of 20 - 40 gyrations per minute

Note:  Users can adjust the speed of gyration.



Number of Gyrations:

0 - 299 gyrations

Minimum Specimen Height:

10.0 mm

External Mold Dimensions:

171.4 mm OD x 281.4 mm tall

Internal Mold Dimensions (Space Available for Loose Asphalt):

150.0 mm +0.0/-0.1 mm ID x 214.7 mm tall

Note:  Molds meet the requirements of AASHTO T312 and ASTM D6925.

Mold Weight (empty):

9.1 kg (20.0 lbs.)

Maximum Mold Temperature Rating:

175°C (350°F) 

Modes of Operation:

Compact to number of gyrations or specified height.

Note:  Users set the desired mode of operation.

Data Acquisition:

Gyration number

Specimen height (mm)

Data Output Options:

USB Flash Drive

RS232 Serial Communication

Receipt Printer, Serial Printer, or Laser Printer (optional)

Internal Data Storage:

Results from 10 tests are retained in memory.


 Part Number

 Part Description


 150-mm Mold Assembly


 150-mm Top & Bottom Mold Plate


 Extruder Funnel


 Mold Extractor Tong Assembly


 Mold End Plate Magnet


 150-mm Specimen Lift Handle


  Hydraulic Filter Kit


 Data Logger


 Laser Printer


 USB Cable, 10 ft. for Laser Printer


 Data Cable for Test Quip, Gilson, & Pine AFGB1 Serial Number 5082 and below


 20-ft. Communication Cable from Gyro to Computer for Pine AFGB1 Serial Number 5083 and above


 3/32" Hex Wrench


 1/4" Hex Wrench with a 9" T Handle


 11/16" Combination Wrench


 GB1 Operation Manual (Request a digital copy by clicking the manual or its part number.)






















The AFGB1 requires periodic maintenance to assure continued reliable performance.  There are not many moving parts, but there are several items that require attention.


Timing Lift Screw

Adjust the Timing Lift Screw if the gyratory head fails to raise and clear the tube when you open the compaction chamber

Pressure Plate Screws

Check weekly with a 3/16" Allen wrench.

Clamp Adjustment

Keep all three clamps equally tight.

Mold Retaining Latches

Remove debris from around these latches after every specimen.


Remove debris and wipe metal surfaces with WD-40.


Under normal usage, the battery should last 4-5 years unless indicator indicates otherwise.


Mold Top Plate

Apply lubricant before compacting each specimen.

 Moly-Grade Anti-Seize Lubricant, CLGSM0S2

Gyratory Head

Apply lubricant once a day or every 6 specimens.

 Moly-Grade Anti-Seize Lubricant, CLGSM0S2

Tapered Bearing

Redistribute the lubricant after each specimen.  Apply fresh lubricant once a week or every 30 specimens.

 Moly-Grade Anti-Seize Lubricant, CLGSM0S2

Pressure Plate

Apply lubricant before compacting each specimen.

 Moly-Grade Anti-Seize Lubricant, CLGSM0S2

Spherical Bearing

Apply lubricant once a day or every 6 specimens.

 Moly-Grade Anti-Seize Lubricant, CLGSM0S2

Gyratory Head & Clamp Recesses

Apply lubricant as needed.

 Moly-Grade Anti-Seize Lubricant, CLGSM0S2

Gyratory Head Lift Nut

Apply a light grease or oil as needed.  Do not put lubricant on the threaded rod.

 SAE 30 Oil



 Hydraulic System

 Check the oil level weekly or every 30 specimens.

 Mold Retaining Latches

 Check for rounding or chipping of the mold latches periodically.

What should be considered in identifying a location for a machine?

  • A sturdy, approximately level floor is important.  The machine weighs about 880 lb. (400 kg) and is top heavy.
  • The machine can be installed in a mobile lab.  Holes are provided in the lower frame bracket to secure the machine to the floor.
  • The minimum floor space requirement is 34.5 inches wide by 35.5 inches deep.  Be sure to allow additional space on the right side of the machine for access to the USB data port.
  • Allow space on either side of the machine for access to service it when necessary if there is insufficient room to move the machine around for servicing.
  • The minimum vertical space necessary is about 54 inches.
  • Provide access to an appropriate power supply for the machine purchased.

How movable is the machine?

  • The machine comes with a set of wheels and handles installed.  Once the machine is off the skid, it can be moved a short distance by a single person.  Care must be taken, however, because of the machine’s high center of gravity.
  • Three (3) lifting eyes are located on the top of the machine to provide a proper location to connect lifting apparatus.
  • The lower frame of the machine is configured to receive fork truck forks.

How often does a machine need calibrated?

  • AASHTO R18 specifies that a gyratory compactor should be verified every 12 months.
  • ASTM D6925-15 Section 6.2 specifies that a gyratory compactor should be calibrated annually or whenever there is reason to doubt the stability of the machine's operation.
  • AASHTO R18 Section specifies that equipment that may be affected by moving it to a new location or environment should be calibrated, standardized, or checked before being placed into service.
  • ASTM D6925-15 Section 6.3 specifies that calibration should be verified after it is moved to a new location.

What should your shipment of a new AFGB1 look like?



Pine Test Equipment

Pine Test Equipment, Inc.
101 Industrial Drive
Grove City, PA 16127

Phone: (724) 458-6393
Fax: (724) 458-6418
E-mail: Contact Us

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