AASHTO T321 PDF

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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Perform the following calculations at the operator-specified load cycle intervals: However, the standard compactive effort may not reproduce the air voids of roadway specimens measured according to T Size px x x x x Prepare a plot of dissipated energy versus load cycles as shown in Figure 6.

Note 5—It may not be possible to calculate dissipated energy D for every load cycle due to memory limitations of the recording and control component. Report the test results listed in Table 2 for each load cycle interval selected by the operator to three significant figures. For loading devices that require gluing a nut for deformation measurement, these cut surfaces provide smooth surfaces for mounting the measurement gauges.

Link to Active This link will always route to the current Active version of the standard. No other units of measurement are included in this standard.

Cycles to Failure—Failure is defined as the point at which the specimen stiffness is reduced to 50 percent of the initial stiffness.

A minimum of 10, load cycles ensures that the specimen does not decrease in stiffness too rapidly. 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.

AASHTO T, Test equipment Controls

Note 7—See E 29 for information on determination of significant figures in calculations. This practice should not be used for acceptance or rejection of a material or for purchasing purposes. Compacted specimens are suitable for volumetric and physical property testing. The total dissipated energy to failure is y321 as part of the output. Please help us to share our service with your friends. Laboratory-Mixed and Compacted Specimens—Sample asphalt aashti in accordance with T 40 and sample aggregate in accordance with T 2.

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These notes and footnotes excluding those in tables and figures aasuto not be considered as requirements of the standard. The performance of HMA can be more accurately predicted when these properties are known. Set the loading frequency within a range of 5 to 10 Hz.

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T_321-07_2011

Initial Stiffness Pa —The initial stiffness is determined by plotting stiffness S aazhto load cycles n and best-fitting the data to an exponential function of the form shown in Equation 7.

When the specimen and clamps are in the proper positions, close the outside clamps by applying sufficient pressure to hold the specimen in place. This standard does not purport to address all of the safety concerns associated with its use. Environmental Chamber Optional —The environmental chamber aasnto enclose the entire specimen and maintain the specimen at Users of this practice are cautioned that compliance with Specification D alone does not completely ensure reliable results.

Precision—The research required to develop precision values has not been conducted. 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 to use. If specimens are to be compacted to a target air void content, the compactive effort to be used should aazhto determined experimentally. An environmental chamber is not required if the temperature of the surrounding environment can be maintained within the specified limits.

The quality of the results produced by this tt321 are dependent on the competence of the personnel performing the procedure and the capability, calibration, and maintenance of the equipment used. When the specimen has experienced t231 than 50 percent reduction in stiffness, terminate the test.

Specimen Dimensions—Report the specimen length, average specimen height, and average specimen aasnto in meters to four significant figures. Please copy and paste this embed script to where you want to embed Embed Script.

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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.

Report the average test temperature to the nearest 0. Report the initial flexural stiffness in pascals. The fatigue t21 and failure energy determined by this standard can be used to estimate the fatigue life of HMA pavement layers under repeated traffic loading.

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The load cycle at which failure occurs is computed by solving for n from Equation 7, or simply: Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.

After t312 the appropriate test parameters, begin the test. Control and Data Acquisition System—During each load cycle, the control and data acquisition system shall be capable of zashto 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.

Please fill this form, we will try f321 respond as soon as possible. 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. Thank you for interesting in our services.

Determine the specimen stiffness at the 50th load cycle. Agencies that meet the criteria of Specification D are generally considered capable of competent and objective testing, sampling, inspection, etc.

Fatigue life; flexural bending; hot aasjto asphalt fatigue; hot mix asphalt flexural testing; hot mix asphalt tensile testing; hot mix asphalt stiffness; hot mix asphalt energy dissipation.