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C: Diametral Test Procedure for Resilient Modulus of Asphalt Concrete
Pages 317-334

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From page 318...
... For lab specimens, a sample having the same mix properties will be selected for indirect tensile strength testing. The indirect tensile strength test is performed as a basis for selecting the loading levels for the resilient modulus testing.
From page 319...
... The thickness of the test specimen can be equal to or less than the layer thickness. Haversine Shaped Load Form - the required load pulse form the resilient modulus test.
From page 320...
... 3.2 Two separate resilient modulus values are obtained. One, termed instantaneous resilient modulus, is calculated using the recoverable horizontal deformation that occurs during the unloading portion of one load-unIoad cycle.
From page 321...
... second duration followed by a rest period of 0.9 seconds between load pulses are applied to the individual test specimens. The magnitude of the load pulse will be selected to produce a predefined indirect tensile stress on the specimen based on a percentage of the indirect tensile strength (see section 3.3(a)
From page 322...
... . The system shall include a temperature-controlled cabinet large enough to house the loading device, and a cabinet adequate to pre-condition at least three test specimens at a time prior to testing.
From page 323...
... indicates a change in the system response or when there is a suspicion of a load cell problem. 5.5 Loading Strips Steel loading strips, with concave sample contact surfaces, machined to the radius of curvature of a 4.000 ~ 0.004 inch diameter specimen or a 6.000 ~ 0.006 inch diameter specimen, are required to apply load to the test specimens.
From page 324...
... However, 6 inch diameter specimens with thickness less than 3 inches but greater than I.5 inch, shall be reduced to a 4 inch diameter specimen and tested where possible. A test specimen shall consist of a single pavement material or layer greater than I.5 inches in thickness.
From page 325...
... (a) Determine the tensile strength of the test specimens at 77° ~ 2°F using the procedure described in Attachment A to SHRP Protocol P07.
From page 326...
... 7.3.2 The sequence of resilient modulus testing shall consist of initial testing at 41°F, followed by intermediate testing at 77°F and final testing at 104°F. The test specimens shall be brought to the specified temperature prior to each test, in accordance to section 7.
From page 327...
... 7.5.3 After testing is completed at 104°F, the specimen shall be brought to a temperature of 77 ~ 2°F and an indirect tensile strength test conducted on the test specimen as specified in Attachment A of SHOP P07. Measure and record the recoverable horizontal and vertical deformations over the last 5 loading cycles of the total applied load pulses.
From page 328...
... on one axis and at three load levels. The synthetic specimens for weekly QA/QC have been selected to provide a response similar to the expected asphalt concrete specimen response at a given temperature as follows: - response similar to asphalt concrete testing at 41 °F Polyethylene - response similar to asphalt concrete testing at 77°F Teflon - response similar to asphalt concrete testing at 104°F If AC resilient modulus testing is to be performed at all three temperatures In a given week, then all three samples shall be tested.
From page 329...
... _ Poisson's ratio: Poisson's ratio shall be calculated from the vertical and horizontal deformation values by the use of the following equation: 1.9345-O.2699~ =. ah 0.4309+ V ah instantaneous or total Poisson's ratio, the recoverable vertical deformation measured over a gage length equal to three quarters of the diameter of the specimen, inches, and the recoverable horizontal deformation measured over the horizontal diameter ofthe specimen, inches.
From page 330...
... When the resilient modulus test is being done to evaluate the deterioration in condition of the pavement, initial values of calculated Poisson's ratio (at the beginning of pavement life) , if available, shall be used for resilient modulus calculations.
From page 331...
... 10.~.5 Indirect tensile strength (final) , to the nearest psi; for the test specimen after the resilient modulus test has been completed.
From page 332...
... over the last 5 loading cycles for each test temperature. The average calculated instantaneous Poisson's ratio and instantaneous resilient modulus for the last 5 load cycles and standard deviation calculated at each test temperature.
From page 333...
... The average calculated total Poisson's ratio and total resilient modulus for the last 5 load cycles and standard deviation calculated at each test temperature. If any one modulus value varies from the average by more than 15%, it shall be omitted from the average calculation.


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