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AASHTO T Standard Method of Test for Determining the Fatigue Life of Compacted Asphalt Mixtures Subjected to Repeated Flexural Bending. standard . AASHTO T/TP8 is a Test Standard for Determining the Fatigue Life of Compacted Hot-Mix Asphalt (HMA) Subjected to Repeated Flexural Bending. AASHTO T (AASHTO, ) and the European Standard (EN , ). When evaluating fatigue resistance through four point bending beam.

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Determine the specimen stiffness at the 50th load cycle. Size px x x x x For loading devices that require a glued nut for deformation measurement, a screw, nut suggested size M 8 by 1 and block assembly for referencing the linear variable differential transducer LVDT to the neutral axis of the specimen, and epoxy for attaching the nut to the specimen are also needed.

Apply 50 load cycles at a constant strain of to microstrain. For loading devices that require gluing a nut for deformation measurement, these cut surfaces provide smooth surfaces for mounting the measurement gauges.

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The test system shall meet the minimum requirements specified in Table 1. Specimen Dimensions—Report the specimen length, average specimen height, and asshto specimen width in meters to four significant figures. The quality of the results produced by this standard are dependent on the competence of the personnel performing the procedure and the capability, calibration, and maintenance of the equipment used.


It is recommended to cut beams from a large slab compacted by a vibratory roller. 3t21 other units of measurement are included in this standard.

We need your help! The total dissipated energy to failure is summarized as part of the output. Hot Mix Asphalt Description—Report the binder type, binder content, aggregate gradation, and air void percentage. Open the clamps and slide the specimen into position Figures 3, 4, and 5.

AASHTO T, Test equipment Controls

Loading Device—The test system shall include a closed-loop, computer controlled loading component that, during each load cycle in response to commands from the data processing and control component, adjusts and applies a load such that the specimen experiences a constant level of strain during each load cycle. Observe standard laboratory safety precautions when preparing and testing HMA specimens.

Allow the epoxy to cure before moving the specimen. Reliable results depend on many factors following the suggestions of Specification D or some similar acceptable guideline that provides a means of evaluating and controlling some of those factors. A stiffness reduction of 50 percent or more represents specimen failure.

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This standard does not purport to address all of aashtl safety concerns associated with its use. Bias—The research required to aasshto the bias of this method has not been conducted. The fatigue life and failure energy determined by this standard can be used to estimate the fatigue life of HMA pavement layers under repeated traffic loading. Prepare a plot of stiffness versus load cycles as shown in Figure 7. Specimen Measurement—Measure the height and width of the specimen to the nearest 0.


Miscellaneous Apparatus and Materials—A suitable saw for cutting the beams and a mechanism for setting proper clamp spacing. The constant A represents the initial stiffness. Maximum Tensile Stress Pa: If specimens are to be compacted to a target air void content, the compactive effort to be used should be determined experimentally.

It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior xashto use.

In addition, it shall be capable of recording load cycles, applied loads, and beam deflections and computing and recording the maximum tensile stress, maximum tensile strain, phase angle, stiffness, dissipated energy, and cumulative dissipated energy at load cycle intervals specified by the user.


Note 1—The type of compaction device may influence the test results. Perform the following calculations at the operator-specified load t32 intervals: Link r321 Active This link will always route to the current Active version of the standard. After selecting the appropriate test parameters, begin the test. This standard provides procedures for determining the fatigue life and fatigue energy of mm long by 50 mm thick by 63 mm wide hot mix asphalt HMA beam specimens sawed from laboratory or field compacted HMA and subjected to repeated flexural bending until failure.