AASHTO TP 116-20 pdf free download

AASHTO TP 116-20 pdf free download.Rutting and Fatigue Resistance of Asphalt Mixtures Using Incremental Repeated Load Permanent Deformation (iRLPD).
5. SIGNIFICANCE AND USE
5.1. The minimum strain rate (111*) is the permanent deformation property of asphalt mixtures and represents the unit rutting damage at high temperature or fatigue resistance at intermediate temperature due to a repeated heavy-axle load.
5.2. For the rutting tests, the minimum strain rate (j*) represents the rutting damage due to a single heavy-axle load at a specific temperature and tire pressure. The m* is used for performance grading of mixtures, mix design verification, material characterization, and rutting performance evaluation.
5.3. The fatigue test simulates field conditions by applying the same loading magnitude and loading pattern as in the field. The specimen. at its intermediate temperature, is incrementally loaded using a repeated load until it reaches failure. The nz’ from the fatigue test is well correlated with field fatigue performance.
6. APPARATUS
6.1. Specimen Fabrication Equipment—Equipment for fabricating IRLPD test specimens as described inT3I2andR83.
6.2. Dynamic Testing System (DTS)—A dynamic test system capable of applying up to 20 KN (4500 lbf) of repeated load (0.1 s loadJO.9 s unload). The DTS shall have a temperature-controlled testing chamber capable of controlling the temperature of the specimen over a temperature range from 4 to 70°C (39 to 158°F) to an accuracy of ±0.5°C (1°F) and preferably capable of holding the test replicates and a dummy specimen with a temperature sensor mounted in the center for temperature verification. For a confined test (rutting Method B), the DTS shall be capable of applying 69 kPa (10 psi) of confining pressure.
6.3. C’onditioning Chamber—An environmental chamber for conditioning the test specimens to the desired testing temperature, in case the testing chamber cannot hold more than the test specimen. The environmental chamber shall be capable of controlling the temperature of the specimen over a temperature range from 4 to 70°C (39 to 158°F) to an accuracy of ±0.5°C (1°F). The chamber shall be large enough to accommodate the number of specimens to be tested plus a dummy specimen with a temperature sensor mounted in the center for temperature verification.
6.4. Late.r Membranes—100-mm (4-in.) diameter by 0.3 mm (0.012 in.) thick latex membranes; to be used to encase the specimen in confined tests and, as greased double-latex friction reducers, between the specimen and the top loading platen.
6.5. Silicone Grease—Dow Corning High Vacuum Grease or equivalent to be used to fabricate the greased double-latex friction reducers.
6.6. Balance—A scale device that is capable of determining mass to the nearest 0.01 g. The balance is used to determine the mass of the silicone grease for the fabrication of greased double-latex friction reducers as described in T 378 Annex A.
7. HAZARDS
7.1. This test and associated standards involve handling of hot asphalt binder, aggregates, and asphalt mixtures. It also includes the use of sawing and coring machinery and servo-hydraulic testing equipment. Use standard safety precautions, equipment, and clothing when handling hot materials and operating machinery.
8. STANDARDIZATION
8.1. Items associated with this test that require calibration are included in Appendix F of NCHRP Report 629. Refer to the pertinent section of the referenced documents for information concerning calibration. 8.2. The guidelines provided in the equipment manufacturer ‘s manual shall be followed to ensure that all equipment is calibrated properly.AASHTO TP 116-20 pdf download.