AASHTO T321 PDF

It represents all transportation modes including: air, highways, public transportation, active transportation, rail, and water. Its primary goal is to foster the development, operation, and maintenance of an integrated national transportation system. AASHTO works to educate the public and key decision makers about the critical role that transportation plays in securing a good quality of life and sound economy for our nation. AASHTO is an international leader in setting technical standards for all phases of highway system development. Standards are issued for design, construction of highways and bridges, materials, and many other technical areas. AASHTO serves as a catalyst for excellence in transportation by offering: Smart solutions and promising practices; Critical information, training and data; Direct technical assistance to states; and Unchallenged expertise.

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Dolmaran 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. Note 7—See E 29 for information on axshto of significant figures in calculations. Place the specimen in an environment that is at Aahsto research required to develop precision values has not been conducted. For loading devices that require gluing a nut for deformation measurement, these cut surfaces provide smooth surfaces for mounting the measurement gauges.

Determine the average of the three measurements for each dimension and record the averages to the nearest 0. When the specimen has experienced greater than 50 percent reduction in stiffness, terminate the test.

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

When the specimen and clamps are in the proper positions, close the outside clamps by applying sufficient pressure to hold the specimen in place. Link awshto Active This link will always route to the current Active version of the standard. 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. 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.

This practice should not be used for acceptance or rejection of a material or for purchasing purposes. Set the loading frequency within a range of 5 to 10 Hz. 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.

Activate the recording and aastho components so that the test results at the selected load cycle intervals are aasuto and recorded, ensuring that the test system is operating properly. Report the initial flexural stiffness in pascals. 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.

This standard t involve hazardous materials, t, and equipment. Please fill this form, we will try to respond as soon as possible. Perform the following calculations at the operator-specified load cycle intervals: 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.

Note 1—The type of compaction device may influence the test results. Specimen Measurement—Measure the height and width of the specimen to the t32 0. We are a non-profit group that run this website to share documents. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.

Figure 1 illustrates the loading conditions. 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. Use the jig to ensure proper horizontal spacing of the clamps, mm center-to-center. Agencies that meet the criteria of Specification D are generally considered capable of competent and objective testing, sampling, inspection, etc. We need your help to maintenance this website. The load cycle at which failure occurs is computed by solving for n from Equation 7, or simply: Laboratory-Mixed and Compacted Specimens—Sample asphalt binder in accordance with T 40 and sample aggregate in accordance with T 2.

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. Compacted aashtp are suitable for volumetric and physical property testing.

The constant A represents the initial stiffness. Duplication is a violation of applicable law. Report the test results listed in Table 2 for each load cycle interval selected by the operator to three significant figures. A minimum of 10, load cycles ensures that the specimen does not decrease in stiffness t rapidly. Cycles to Failure—Failure is defined as the point at which the specimen stiffness is reduced to 50 percent of the initial stiffness.

Report the average test temperature to the nearest 0. The performance of HMA can be more accurately predicted when these properties are known. TOP Related Articles.

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Dolmaran 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. Note 7—See E 29 for information on axshto of significant figures in calculations. Place the specimen in an environment that is at Aahsto research required to develop precision values has not been conducted. 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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AASHTO T321 PDF

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