AASHTO T321 PDF

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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Note 1—The type of compaction device may aashtp the test results. The load cycle at which failure occurs is computed by solving for n from Equation 7, or simply: 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.

T__ – Free Download PDF

Apply epoxy in a circle around this center point and place the nut on the epoxy such that the center of the nut is over the center point. See Notes 1 and 2.

Environmental Chamber Optional —The environmental chamber shall enclose the aazhto specimen and maintain the specimen at Please fill this form, we will try to respond as soon as possible. Loading Device—The t31 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.

For loading devices that require aawhto a nut for deformation measurement, these cut surfaces provide smooth surfaces for mounting the measurement gauges. If specimens are to be compacted to a target air void content, the compactive effort to be used should be determined experimentally.

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Maximum Tensile Stress Pa: This standard may involve hazardous materials, operations, and equipment. Cycles to Failure—Failure is defined as the point at aashtp the specimen stiffness is reduced to 50 percent of the initial stiffness.

Report the test results aasjto in Table 2 for each load cycle interval selected by the operator to three significant figures. Specimen Dimensions—Report the specimen length, average specimen height, and average specimen width in meters to four significant figures.

However, the standard compactive effort may not reproduce the air voids of roadway specimens measured according to T Next, close the inside clamps by applying sufficient pressure to hold the specimen in place. Compacted specimens are suitable for volumetric and physical property testing. Place the specimen in an environment that is at Determine the specimen stiffness at the 50th load cycle.

We need your help! Note 3—Selection of load cycle intervals at which test results are computed and recorded may be limited by the amount of memory available for storing data. Saw at least 6 mm from both sides of each test specimen to provide parallel saw-cut surfaces to eliminate high air void sections on the specimen surface.

T_321-07_2011

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 g321.

Laboratory-Mixed and Compacted Specimens—Sample asphalt binder in accordance with T 40 and sample aggregate in accordance with T 2. Figure 7 presents a typical plot of stiffness versus load cycles. It is the responsibility of the user of this procedure aasbto establish appropriate safety and health practices and to determine the applicability of regulatory limitations prior to use.

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Initial Stiffness Pa —The initial stiffness is determined by plotting stiffness S against load cycles n and best-fitting the data to an exponential function of the form shown in Equation 7. A minimum of 10, load cycles ensures that the specimen does not decrease in stiffness too rapidly. The performance of HMA can be more accurately predicted when these properties are known.

Thank you for interesting in our services. The constant A represents the initial stiffness.

Allow the epoxy to cure before moving the specimen. Reliable results t32 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.

These notes and footnotes excluding those in tables and figures shall not be considered as requirements of the standard.

Asahto the specimen and clamps are in the proper positions, close the outside clamps by applying sufficient pressure to hold the specimen r321 place. The area under the curve represents the cumulative dissipated aasht. Set the loading frequency within a range of 5 to 10 Hz.

It is recommended to cut beams from a large slab compacted by a vibratory roller. Agencies that meet the criteria of Specification D are generally considered capable of competent and objective testing, sampling, inspection, etc. Please help us to share our service with your friends. Duplication is a violation of applicable law. No other units of measurement are included in this standard.