AASHTO PP 95-18 pdf free download

AASHTO PP 95-18 pdf free download.Preparation of IndirectTension Performance Test Specimens.
3. TERMINOL OGY 3.1. gyratory specimen- Nominal 150土9 mm in diameter by minimal 150-mm high cylindrical specimen prepared in a gyratory compactor. 3.2. roadway specimen- Specimens obtained from the pavement in accordance with ASTM D5361. Specimen dimensions consist of nominal 150土9 mm in diameter with a layer thickness greater than 50 mm. 3.3. test specimen- Nominal 150土9 mm diameter by 38-mm thick cylindrical specimen that is sawed and cored from the gyratory or roadway specimen. 3.4. indirect tension (IDT)- a method of loading a material by applying a compressive force on a cylindrical specimen in one direction, which results in a tensile stress and strain in the perpendicular direction due to the Poisson’ s effect, which describes lateral contraction or elongation due to axial elongation or contraction under loading, respectively. 4. SUMMARY OF PRACTICE 4.1. This practice presents methods for preparing 150土9 mm in diameter by 38- to 50-mm thick cylindrical test specimens for use in an indirect tension dynamic modulus test. 5. SIGNIFICANCE AND USE 5.1. This practice should be used to prepare specimens for the following standard test: TP 131, Determining the Dynamic Modulus of Asphalt Concrete Using the Indirect Tension Test 5.2. This practice may also be used to prepare specimens for other non-standard tests requiring 150土 9 mm in diameter by 38 to 50 mm thick cylindrical test specimens. 6. APPARATUS 6.1. Superpave Gyratory Compactor- A compactor meeting the requirements ofT 312 and capable of preparing specimens with a 150土9 mm diameter and a minimum height of 150 mm. 6.2. Mixture Preparation Equipment- Balances, ovens, thermometers, mixer, pans, and other miscellaneous equipment needed to prepare gyratory specimens in accordance with T 312 and make specific gravity measurements in accordance with T 166, T 209, and T 269. 6.3. Masonry Saw- -An air or water-cooled diamond bladed masonry saw capable of cutting specimens to a nominal height of 38 to 50 mm. Note 1- -Single saws have been succesfully used to prepare specimens meeting the dimensional tolerances given in Section 10.5.3. Accurate sawing requires a fixture to securely hold the specimen during sawing and to control the feed rate. 6.4. Calipers- Calipers capable of measuring the specimen diameter, nominally 150土9 mm, to the nearest 0.25 mm and nominal 38- to 50-mm thick specimens to the nearest 0.1 mm. 6.5. Marking Device- A marking device shall be used to mark mutually perpendicular axes on the front and back faces of the specimen through the center. An example is shown in Figure 1.7. HAZARDS 7.1. This practice and associated standards involve handling of hot asphalt binder, aggregates and asphalt mixtures, and the use of sawing and coring machinery. Use standard safety precautions, equipment, and clothing when handling hot materials and operating machinery. 8. STANDARDIZATION 8.1. Items associated with this practice that require calibration are included in the AASHTO standards referenced in Section 2. Refer to the pertinent section of the referenced standards for information concerning calibration. 9. SAMPLING . 9.1. Gyratory Specimens- Prepare a minimum of two gyratory specimens, to produce four test specimens, in accordance with Sections 10.1 to 10.4. 9.2. Roadway Specimens- Obtain roadway specimens from the pavement in accordance with ASTM D5361. Mark an arrow with the traffic direction on the flat face of the core. Prepare cores with smooth and parallel surfaces that conform to the height and diameter requirements specified in Section 10.5.3. Prepare a minimum of three replicate cores.AASHTO PP 95-18 pdf download.