AASHTO PP 95:18 (2020) Standard Specification for Preparation of Indirect Tension Performance Test Specimens.
10.1. Asphalt Mixture Preparation:
10.1 .1. Prepare asphalt mixture for each test specimen and a companion maximum specific gravity test in accordance with Section 8 of T 312.
10.1.2. The mass of mixture needed for each specimen will depend on the gyratory specimen height, the specific gravity of the aggregate, the nominal maximum aggregate size, gradation (coarse or fine). and the target air void content for the test specimens.
10.1.3. Perform mixture conditioning for the test specimens and companion maximum specific gravity test in accordance with Section 7.2 of R 30, Short-Term Conditioning for MLvture Mechanical Property Testing.
10.2.1. Compact the gyratory specimens in accordance with Section 9 of T 312.
10.2.2. Compact the gyratory specimens to the target gyratory specimen height.
Note 2—Each laboratory should determine a target gyratory specimen height based on the procedure for evaluating test specimen uniformity, and an evaluation of the ability of the sawing equipment to maintain the dimensional tolerances given in Section 10.5.3. See Appendix X2 of R 83. Preparation of Cvlindrica! Performance Test Specimens Using the Supeipave Gratorv compactor for further information.
1 0.3. Long— Term conditioning (Optional):
10.3.1. If it is desired to simulate long-term aging, condition the gyratory specimen in accordance with Sections 7.3.4 through 7.3.6 of R 30.
10.3.2. To obtain accurate volumetric measurements on the long-term conditioned specimens. condition a sample of short-term conditioned loose mix meeting the sample size requirements of T 209 in accordance with Sections 7.3.4 through 7.3.6 of R 30.
10.4. Gyratorv Specimen Density and Air Voids (Optional,):
10.4.1. Detennine the maximum specific gravity of the mixture in accordance with T 209. Record the maximum specific gravity of the mixture.
10.4.2. For dense- and gap-graded mixtures, determine the bulk specific gravity of the gyratory specimen in accordance with T 166. Record the bulk specific gravity of the gyratory specimen.
10.4.3. For open-graded mixtures, determine the bulk specific gravity of the gyratory specimen in accordance with Section 6.2 of T 269.
10.4.4. Compute the air void content of the gyratory specimen in accordance with T 269. Record the air void content of the gyratory specimen.
Note 3—Section 10.4 is optional because acceptance of the test specimen for mechanical property testing is based on the air void content of the test specimen, not the gyratory specimen. However, monitoring gyratory specimen density can identify improperly prepared specimens early in the specimen fabrication process.AASHTO PP 95 pdf download.