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LTPP Data Analysis: Guidelines to Improve Use of FWD and Longitudinal Profile Measurements

Project Details
STATE

NCHRP

SOURCE

National Academies

START DATE

11/16/21

END DATE

02/15/24

RESEARCHERS

Linda Pierce

SPONSORS

NCHRP, AASHTO, Federal Highway Administration

KEYWORDS

Data analysis, Deflection, Falling weight deflectometers, Guidelines, Pavement performance, Roughness, Temperature

LINKS

Product

Project description

The Long-Term Pavement Performance Program (LTPP) Seasonal Monitoring Program (SMP) was initiated to obtain data on the influence of temporal variations on pavement deflection and roughness. However, the temporal and diurnal data contained in the LTPP database (see Special Note A) have not been applied to improve the practices of measuring deflection and roughness, and their use has not been demonstrated. Also, recent work completed under NCHRP Project 20-50(22), “LTPP Data Analysis: Feasibility of Using LTPP data to improve Use of FWD and Longitudinal Profile Measurements” identified some of the issues related to the use of FWD and longitudinal profile measurements and proposed a preliminary research plan for addressing these issues (see Special Note B). However, additional research is needed to further define and address the issues associated with the effects of temporal and diurnal variations on FWD and longitudinal profile measurements, and to develop guidelines to improve these measurements and their use in evaluating pavement condition.
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