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Title: Falling-weight deflectometer study : optimizing the number of replicates and the spacing of test stations
Authors: Strategic Highway Research Program (U.S.)
United States. Federal Highway Administration.
Freeman, Reed B.
Alexander, Don R.
Keywords: Falling-weight deflectometer
Spatial variability
Non-destructive testing
Nondestructive testing
Test variability
Pavement performance
Pavement performance
Pavement evaluation
Pavement testing
Publisher: Geotechnical and Structures Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Series/Report no.: ERDC/GSL TR ; 01-11.
Description: Technical Report
Abstract: The Strategic Highway Research Program, managed by the Federal Highway Administration, includes a pavement evaluation component as part of its Long-Term Pavement Performance study. These evaluations include the use of falling-weight deflectometer (FWD) test devices. The purpose of this project was to determine whether the FWD test procedures could be modified to reduce cost, without losing a significant amount of information. Procedural changes could include a decrease in the number of test replicates and/or an increase in the spacing between test stations. Variability between replicates was found to be relatively low; a reduction in replicate drops from four to two would not cause a substantial loss in information. An increase in spacing between tests from 7.6 m (25ft) to 30.5 m (100ft) would result in a substantial loss ofinfonnation. An increase in spacing from 7.6 m (25ft) to 15.2 m (50ft) would be reasonable if test section responses to FWD were to be summarized as expected values and dispersions. If extremes in pavement response (e.g., minimum and/or maximum stiffness) were judged to be the most important results, the spacing between tests should not be increased from 7.6 m (25ft).
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:Technical Report

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