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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Laboratory-Mixed and Compacted Specimens—Sample asphalt binder in accordance with T 40 and sample aggregate in accordance with T 2. See Notes 1 and 2. Please fill this form, we will try to respond as soon as possible.

AASHTO T, Test equipment Controls

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. We need your help to maintenance this website. Set the loading frequency within a range of 5 to 10 Hz. We are a non-profit group that run this website to share documents.

After selecting the aashtl test parameters, begin the test. Report the cycles to failure. Test System—The test system shall consist of a loading device, an environmental chamber optionaland a control and data acquisition system.

T_321-07_2011

Note 1—The type of compaction device may influence the aashto results. Fatigue life; flexural bending; hot mix asphalt fatigue; hot mix asphalt flexural testing; hot mix asphalt tensile testing; hot mix asphalt stiffness; hot mix asphalt energy dissipation. The total dissipated energy to failure is summarized as part of the output.

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. The load cycle at which failure occurs is computed by solving for n from Equation 7, or simply: We need your aashfo

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Cycles to Failure—Failure is defined as the point at which the specimen stiffness is reduced to 50 percent of the initial stiffness. See Figure 6 for a typical dissipated energy versus load cycle plot.

Report the test results listed in Table 2 for each load cycle interval selected by the operator to three significant figures. Please copy and paste this embed script to where you want to embed Embed Script. Note 3—Selection of load cycle intervals at t3221 test results are computed and recorded may be limited by the amount of memory available for storing data. Hot Mix Asphalt Description—Report the binder type, binder content, aggregate gradation, and air void percentage.

Control and Data Acquisition System—During each load cycle, the control and data acquisition system shall be capable aaashto measuring the deflection of the beam specimen, computing the strain in the specimen, and adjusting the load applied by the loading device such that the specimen experiences a constant level of strain on each load cycle.

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. Report the average test temperature to the nearest 0. Activate the recording and control components so that the test results at the selected load cycle intervals are monitored and recorded, ensuring that the test system is operating properly.

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An environmental chamber is not required if the temperature of the surrounding environment can be maintained within the specified limits. Compacted specimens are suitable y321 volumetric and physical property testing.

Note 5—It may not be possible to calculate dissipated energy D aasgto every load cycle due to memory limitations of the recording and control component. 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.

Precision—The research required to develop precision values 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. Thank you for interesting in our services.

A stiffness reduction of 50 percent or more represents specimen failure. 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. Specimen Dimensions—Report the specimen length, average specimen height, and average specimen width in meters to four significant figures.

The area under the curve represents the cumulative dissipated energy.

When the specimen has experienced greater than 50 percent reduction in stiffness, terminate the test. Figure 1 illustrates the loading conditions. This practice should not be used for acceptance or rejection of aasbto material or for purchasing purposes.