ESBD_537908_1784046883285_02. Specification TxDOT 845-63-53366 SGC.pdf

TEXAS DEPARTMENT OF TRANSPORTATION

SPECIFICATION NO.

TxDOT 845-63-53366

REVISED: MAY 2026

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SUPERPAVE GYRATORY COMPACTOR (SGC)

PUBLICATION

This specification is a product of the Texas Department of Transportation (TxDOT). This specification may not be sold for profit or monetary gain. If this document is altered in any way, the header and any and all references to TxDOT shall be removed. TxDOT does not assume nor accept any liability when this specification is used in the procurement process by any other entity.

1. SCOPE: This specification is for the purchase of one Superpave Gyratory Compactor.

2. DELIVERY LOCATION: The unit must be delivered to the Texas Department of

Transportation, Materials and Tests Division 6230 E. Stassney Lane Austin, TX 78744. Attn:

Benjamin Arras

3. DEFINITIONS OF TERMS AND ACRONYMS

3.1. ANSI – American National Standards Institute

3.2. HMA – Hot Mix Asphalt

3.3. TxDOT – Texas Department of Transportation

3.4. ID – Inside Dimension

3.5. AASHTO – American Association of Highway and Transportation Officials.

3.6. ASTM – American Society for Testing and Materials.

3.7. kN - Kilonewtons

4. EQUIPMENT

4.1. Equipment furnished must be the latest model in current production, as offered to commercial trade, and of good quality workmanship and material. Vendor represents that all equipment offered will be new. Used, shopworn, demonstrator, prototype, remanufactured, or discontinued models are not acceptable.

4.2. All parts not specifically mentioned that are necessary for the unit to be complete and ready for operation, or which are normally furnished as standard equipment, must be furnished by the vendor. All parts must conform in strength, quality, and workmanship to accepted industry standards.

4.3. The unit provided must meet or exceed all federal and state of Texas safety, health, lighting, and noise regulations and standards in effect and applicable to equipment furnished at the time of manufacture.

4.4. The equipment must produce cylindrical specimens from loose hot mix asphalt (HMA) by applying vertical consolidation pressure combined with a gyratory (kneading) compaction method.

4.5. The equipment must be an electromechanical system for both operation and control.

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4.6. The compactor must weigh at least 880 lb. (400 kg) to ensure stability and reliable operation.

4.7. The equipment must meet all requirements of Tex-241-F, Test Procedures for Compacting Bituminous Specimens Using the Superpave Gyratory Compactor (see Attachment A).

4.8. The equipment must meet all requirements of AASHTO T 312-22, Standard Method of Test for Preparing and Determining the Density of Asphalt Mixture Specimens by Means of the Superpave Gyratory Compactor (see Attachment B).

4.9. The equipment must meet all requirements of ASTM D6925-23, Standard Test Method for Preparation and Determination of the Relative Density of Asphalt Mix Specimens by Means of the Superpave Gyratory compactor (see Attachment C).

5. COMPACTION CHAMBER

5.1. The equipment must be completely enclosed and provide sufficient workspace to allow the mold to be charged, positioned, and extruded without lifting.

5.2. The chamber must include a window in the door for visual observation.

5.3. The chamber must include an emergency stop switch for immediate shutdown.

5.4. The chamber must include a self-aligning ram and mold carriage assembly.

5.5. The compactor must maintain a gyration speed of 30 ± 0.5 gyrations per minute.

5.6. The compactor must be capable of 1–999 programmed gyrations with automatic shutoff.

5.7. Consolidation pressure must be applied using a mechanical screw-driven ram mechanism.

6. GYRATORY MOLD ASSEMBLIES AND RAM HEADS

6.1. The compactor must be supplied with three 150 mm mold assemblies. Tolerances must be verified at 20–22 °C.

6.2. Specimen molds must have steel walls that are at least 7.5 mm (0.3 in.) thick and have a minimum Rockwell hardness of C48.

6.3. Molds must have an inside diameter of 149.90-150.00 mm (5.901-5.912 in.) and be at least 250 mm (10 in.) high. Molds must withstand constant reheating up to 175 °C (347 °F) without pitting and scarring.

6.4. The inside finish of the molds must have a root mean square (RMS) of 1.60 μm or smoother.

6.5. A tool or method for extruding specimens from the mold must be included.

6.6. Ram head and mold bottoms must be fabricated from steel with a minimum Rockwell hardness of C48.

6.7. The ram heads must be perpendicular to its axis.

6.8. The platen side of each mold bottom must be flat and parallel to its face.

6.9. All ram and base plate faces (the sides presented to the specimen) must be ground flat to meet the smoothness requirements of ANSI B 46.1 and must have a diameter of 149.50-149.75 mm (5.885-5.896 in.).

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7. RECORDING AND DATA OUTPUT

7.1. Specimen height must be measured, recorded, and displayed once per gyration within ±0.1 mm accuracy.

7.2. Data acquisition must include gyration number, specimen height, angle of gyration, and consolidation pressure.

7.3. The system must store data from at least 20 compacted specimens.

7.4. The system must include one RJ45 Ethernet port and at least two USB ports.

7.5. Electrical operation must be compatible with 110/115 VAC, 12 A, 50/60 Hz, single-phase power.

8. CALIBRATION

8.1. The compactor must be supplied with all necessary calibration tools for pressure, height, and gyratory angle.

8.2. Calibration must provide at least 10 points each for force and height.

8.3. Required calibration tools must include:

8.3.1. A certified 5,000 lb. (approximately 22.2 kN) maximum load ring.

8.3.2. A certified height calibration block.

9. ADDITIONAL SPECIFICATIONS:

9.1. The unit must include a built-in specimen extruder.

9.2. Compaction must be programmable to stop based on gyrations, height, or locking point.

9.2.1. The compactor must produce 150 mm diameter specimens with adjustable height from 62 ± 1 mm to 115 ± 5 mm.

9.2.2. Height adjustments must not require recalibration.

9.3. The equipment must support compaction at either internal or external gyratory angle.

9.4. A manual mold locking mechanism must be provided.

9.5. Maximum equipment dimensions must not exceed:

9.5.1. Width 875 mm (34.5 in.)

9.5.2. Depth 900 mm (35.5 in.)

9.5.3. Height 1375 mm (54 in.)

10. ACCESSORIES:

10.1. A supply of 150 mm paper disks must be included.

10.2. A 150 mm mold funnel must be provided.

10.3. A 150 mm specimen lift handle must be included.

10.4. One container of manufacturer-recommended lubricant must be supplied.

11. INSTALLTION AND CALIBRATION:

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Vendor must install the units at the designated TxDOT site and complete all required calibration. Vendor must provide all cables, hoses, brackets, and accessories needed for safe installation and diagnostic testing. The unit must be fully operational upon completion.

TxDOT will perform all physical site modifications unless otherwise specified.

Vendor must notify the TxDOT point of contact at least ten (10) working days before installation.

NOTE: Please include installation, calibration, and freight charges in the unit price of the bid tab.

12. EXAMPLE MAKE/MODLES

Models are listed for reference only to show the expected type and quality. Equivalent equipment meeting or exceeding this specification will be considered in accordance with paragraph 2.01 of the TxDOT Terms and Conditions.

12.1. Pine- Model AFG2A

12.2. Gilson- Model HM-685

13. DELIVERABLES

13.1. One Super Gyratory Compactor meeting all requirements of this specification.

13.2. Factory Trained Technician to perform installation and calibration only (no training required).

14. WARRANTY REQUIREMENTS

14.1. MATERIAL WARRANTY: Materials provided under the contract must be in current production, as offered to commercial trade, and be of quality material. Used, shopworn, demonstrator, prototype, reconditioned, or discontinued materials are not acceptable. Materials must be warranted against material defects and defects in workmanship for a period of not less than 12 months and cover 100% parts and labor. The warranty period must commence upon date of acceptance by TxDOT. If the manufacturer’s standard warranty period exceeds 12 months, then the standard warranty period must be in effect. The vendor must be responsible for the warranty.

The vendor must provide the designated TxDOT representative with all manufacturers’ warranty documents upon completion of service prior to leaving the job site.

15. VENDOR PERFORMANCE: Vendor performance will be monitored on a regular basis by TxDOT.

15.1. An unsatisfactory performance determination includes, but is not limited to:

15.1.1. Failure to deliver any portion of the equipment.

15.1.2. Any requirement not met as outlined in the equipment requirements determined by TxDOT.

NOTE: Unsatisfactory performance may result in a negative vendor performance report, or cancellation of the contract or both, in addition to any other rights, liquidated damages and remedies provided by the contract or allowed by law.

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15.2. An exceptional performance determination includes, but is not limited to:

15.2.1. Deliverables made early upon TxDOT personnel request.

15.2.2. Product upgrade substitution suggested and accepted at no additional cost to TxDOT.

15.2.3. Vendor commended for exceptional customer service; exceptional service provided.

15.2.4. Provided technical assistance when not required.