The Asphalt Materials Section of the State Materials Office seeks to purchase a Troxler Model 5850 Superpave Gyratory Compactor (SGC) and molds as a replacement for an existing Troxler Model 5850 SGC and molds. The purpose of this equipment is to compact asphalt mixture specimens in order to determine their volumetric properties as well as mixture performance characteristics. The SGC must meet the requirement of the American Association of State Highway and Transportation Officials (AASHTO) test method T 312 Preparing and Determining the Density of Asphalt Mixture Specimens by means of the Superpave Gyratory Compactor. General Requirements The following are the minimum general requirements for this equipment: Superpave Gyratory Compactor—An electrohydraulic compactor with a ram and ram heads as described below. The axis of the ram shall be perpendicular to the platen of the compactor. The ram shall apply and maintain a pressure of 600 ± 18 kPa perpendicular to the cylindrical axis of the specimen during compaction. This stress calculates to 10,600 ± 310 N total force for 150-mm specimens. The loading system, ram, and pressure indicator shall be capable of providing and measuring a constant vertical pressure of 600 ± 60 kPa during the first five gyrations, and 600 ± 18 kPa during the remainder of the compaction period. The compactor shall tilt the specimen molds at an average internal angle of 20.2 ± 0.35 mrad (1.16 ± 0.02 degrees), determined in accordance with AASHTO T 344 Evaluation of Superpave Gyratory Compactor Internal Angle of Gyration Using Simulated Loading. The adjustment of the angle shall be electronically controlled. The compactor shall gyrate the specimen molds at a rate of 30.0 ± 0.5 gyrations per minute throughout compaction. A means shall be provided to continuously measure and record the height of the specimen to the nearest 0.1 mm during compaction once per gyration. The system must include a connected printer capable of printing test information, such as specimen height per gyration. Specimen Molds—Specimen molds shall have steel walls that are at least 7.5 mm thick and are hardened to at least a Rockwell hardness of C48. The initial inside finish of the molds shall have a root mean square (rms) of 1.60 µm or smoother when measured in accordance with ASME B46.1. The molds shall be manufactured to have an inside diameter of 149.90 to 150.00 mm. Molds shall be at least 250 mm in length. The inside diameter and length of the molds shall be measured in accordance with Annex A of AASHTO T 312. Ram Heads and End Plates—Ram heads and end plates shall be fabricated from steel with a minimum Rockwell hardness of C48. The ram heads shall stay perpendicular to their axis. The platen side of each end plate shall be flat and parallel to its face. All ram Docusign Envelope ID: 89300184-0735-425B-9C1C-CF60C40A88CC SPECIFICATIONS and end plate faces (the sides presented to the specimen) shall be flat and shall have a root mean square (rms) of 1.60 µm or smoother when measured in accordance with ASME B46.1 and shall have a diameter of 149.50 to 149.75 mm.
