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Federal Highway Administration Research and Technology
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Report
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Publication Number: FHWA-RD-03-041

Evaluation and Analysis of LTPP Pavement Layer Thickness Data

Description below

Figure 72 in page 115 shows a chart for the percentage distribution of deviations of the mean core-measured layer thickness for five material types including DGATB, LC, PATB, PCC, and SB from the corresponding target thickness listed in Table 50 in page 105. The percentage is determined by the number of deviations that are below, within, or above the tolerance level (TV) of 25.4 mm divided by the total number of deviations from the corresponding target thickness. The horizontal axis of the chart is the corresponding target thicknesses for each of the five material types. The vertical axis is the percentage of deviations that are below, within, or above the TV of 25.4 mm, which are displayed as a vertical bar of 100 percent in total, consisting of black (below the TV of 25.4 mm), blank (within the TV of 25.4 mm), and gray (above the TV of 25.4 mm) percentages. On average for the five material types, about 5.5 percent of the deviations are below the TV of 25.4 mm; about 83.9 percent of the deviations are within the TV of 25.4 mm; and about 10.6 percent of the deviations are above the TV of 25.4 mm.

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