PROCEDURE FOR OPTIMUM PAVEMENT DEFLECTION TEST SPACINGS FOR NETWORK-LEVEL APPLICATIONS

摘要

Structural models in pavement management systems range from the very simple to relativelycomplex. The simplest models utilize deflections or deflection basin parameters to characterizesubgrade and pavement structural properties. The more complex structural models utilizepavement layer moduli (derived from deflections) and pavement layer thicknesses and materialtypes to calculate pavement response which is then used to predict failure, much like projectlevel pavement design analysis. Any PMS system using the latter, more complex approach,would undoubtedly need more deflection information than the former, more simplistic approach.In any case, deflection data collection is expensive and time-consuming. Most states and localagencies have only a handful of FWDs and these are used mainly to collect project leveldeflection data for scoping maintenance and rehabilitation work at the project level and forresearch purposes. This paper explore the use of models to estimate the error associated with thechoice of different deflection test spacing that can be used to optimize data collection for moreefficient and economical applications in PMS.