NONDESTRUCTIVE STRUCTURAL EVALUATION OF AIRPORT CONCRETE PAVEMENTS WITH 200kN-FWD

Nondestructive structural evaluation method of airport concrete pavements using FWD with 200kN is described. The method consists of two phases; one is to estimate both elastic coefficient of concrete and coefficient of subgrade reaction based on measured deflections at slab center, and the other is to evaluate structural integrity, load transfer effectiveness and voids underneath slab, based on the deflections at joints and cracks. In the process of this development, deflections measured at various airport pavements in service and some experimental pavements have been analyzed, and then practical criteria are described after comparing with the current procedure.