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Publication Number: FHWA-RD-03-041

Evaluation and Analysis of LTPP Pavement Layer Thickness Data

Description below

Figure 71 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 59 in page 113. The percentage is determined by the number of deviations that are below, within, or above the tolerance level (TV) of 12.7 mm divided by the total number of deviations from the corresponding target thickness. The horizontal axis of the chart is the corresponding target thicknesses listed in for each of the five material types. The vertical axis is the percentage of deviations that are below, within, or above the TV of 12.7 mm, which are displayed as a vertical bar of 100 percent in total, consisting of black (below the TV of 12.7 mm), blank (within the TV of 12.7 mm), and gray (above the TV of 12.7 mm) percentages. On average for the five material types, about 11.4 percent of the deviations are below the TV of 12.7 mm; about 62.5 percent of the deviations are within the TV of 12.7 mm; and about 26.1 percent of the deviations are above the TV of 12.7 mm.

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The Federal Highway Administration (FHWA) is a part of the U.S. Department of Transportation and is headquartered in Washington, D.C., with field offices across the United States. is a major agency of the U.S. Department of Transportation (DOT).
The Federal Highway Administration (FHWA) is a part of the U.S. Department of Transportation and is headquartered in Washington, D.C., with field offices across the United States. is a major agency of the U.S. Department of Transportation (DOT). Provide leadership and technology for the delivery of long life pavements that meet our customers needs and are safe, cost effective, and can be effectively maintained. Federal Highway Administration's (FHWA) R&T Web site portal, which provides access to or information about the Agency’s R&T program, projects, partnerships, publications, and results.
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