Improved Rolling Dynamic Deflectometer for Continuous Pavement Deflection Measurements

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Journal of Testing and Evaluation, ISSN: 0090-3973, Vol: 42, Issue: 2, Page: 312

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BooHyun Nam; Kenneth H. Stokoe
ASTM International
Materials Science; Engineering; rolling dynamic deflectometer; continuous deflection profile; pavement; evaluation; Materials Science; Characterization & Testing
article description
Unlike discrete testing methods, the rolling dynamic deflectometer (RDD) performs continuous measurements. Thus, it is a powerful screening and evaluation tool for quickly characterizing large sections of highway and airfield pavements with little danger of missing critical pavement features. RDD testing applications have involved (1) pavement forensic investigations, (2) delineations of areas to be repaired, (3) selections of rehabilitation treatments, measurements of relative improvements due to the rehabilitation, and (4) monitoring of changes with time (trafficking and environmental loading). This paper discusses the efforts to improve the velocity of RDD testing up to 5 mph (8.0 km/h) while minimizing the accuracy and resolution of deflection data. The research consisted of the development of a velocity-improved rolling sensor and the field evaluation of its new sensor system. The velocity-improved rolling sensor and the enhanced data processing were tested in both flexible and rigid pavements at varied velocities. The enhanced RDD system potentially enabled testing velocities of up to 5 mph (8.0 km/h) in thin flexible pavements (i.e., farm-to-market roads) and up to 3 mph (4.8 km/h) in rigid pavements. © ASTM Int'l (all rights reserved).