U.S. Department of Transportation
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Federal Highway Administration Research and Technology
Coordinating, Developing, and Delivering Highway Transportation Innovations
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Publication Number: FHWA-RD-03-093
Date: August 2006
Study of Long-Term Pavement Performance (LTPP): Pavement Deflections
Chapter 2. LTPP Data Screened and Reviewed
The level E FWD load-deflection data (Data Release 9.0, November 23, 1998) were requested and received when this project began in 1998. Included with this requested information were up-to-date FWD loads and deflections, along with all pertinent ancillary FWD data. All data were then processed as described below.
Data Organization for Screening and Processing
The data obtained from the database were organized for detailed analyses. Specifically, the largest volume of LTPP data in the database, the FWD load-deflection data from the “*.M06” data tables, was reorganized as follows:
Individual FWD instruments, or machines, are identified by serial number (SN). Thus FWD SN #129 refers to the FWD with the serial number 129. In this report, serial number is sometimes referred to as unit. Thus FWD SN #129 is also identified as unit #129.
The pre-autumn 1998 comma-delimited structure of each line of load-deflection data, as recorded in the database at level E, is shown in table 1.
Topics: research, infrastructure, pavements and materials
Keywords: research, infrastructure, pavements and materials,Long-Term Pavement Performance, LTPP, falling weight deflectometer, FWD, load-deflection data, deflection basin, deflection sensors, pavement deflection testing
TRT Terms: research, facilities, transportation, highway facilities, roads, parts of roads, pavements