NCHRP Report 704 A Performance-Related Specification for

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Additional resources for NCHRP Report 704 A Performance-Related Specification for Hot-Mixed Asphalt

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0E-04 Measured D(t) [1/psi] Figure 17. 9). relationship assumed to relate the time of load, vehicle speed, and the effective length of the stress pulse. loading time at any point within the asphalt layer. This process is graphically illustrated in Figure 18. When considering the stress at a point “A” within the pavement system, a wheel load at a considerable distance from point “A” will have no effect and the stress at A is zero (12). ” The MEPDG methodology assumes that the normal stress pulses due to load are sinusoidal or haversine, with duration dependent on the vehicle speed and the depth of point “A” below the pavement surface.

5 in. 5 in. sub-layer). • HMA depths from 1 in. to 4 in. , and 1 in. 8 Pavement Structure = 6 in. ) Figure 23. Effect of adding a 6-In. 6°F) 35 • HMA depths from 4 to 8 in. are subdivided into two sub- layers: 2 in. and 2 in. • HMA depths from 8 to 12 in. are subdivided into one sub-layer: 4 in. • HMA depths below 12 in. are subdivided into one sub-layer Initial Factorial Simulation Runs. As already noted, of the total of 63 variables included in the MEPDG for flexible pavement design, only 10 were eventually selected to determine their statistical significance.

And 2 in. • HMA depths from 8 to 12 in. are subdivided into one sub-layer: 4 in. • HMA depths below 12 in. are subdivided into one sub-layer Initial Factorial Simulation Runs. As already noted, of the total of 63 variables included in the MEPDG for flexible pavement design, only 10 were eventually selected to determine their statistical significance. These variables and their levels were as follows: representing the remaining thickness of the pavement. • Environmental condition (hot: Phoenix, AZ, and cold: The database also was increased from the example in Figure 23 to include thicker structures.

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