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Key Word $B!'(B whitetopping, loading performance of joints, three dimensional finite element method, FWD

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LOADING PERFORMANCE OF JOINTS IN WHITETOPPING

Takashi TOMOTO, Hiroji KOSEKI, Hidenori HAMADA and Tatsuo NISHIZAWA

Whitetopping is a thin concrete overlay on asphalt pavements. In case of road pavement, design thickness of$B!!(Bwhitetopping would be decided based on critical stress that develops at longitudinal free slab edge. However, in case of air field pavement, design thickness would be decided based on stress at joints of whitetopping. In this study, we constructed the field trial of whitetopping, conducted loading tests and measured strains in the concrete and asphalt layers. By comparing measured and analyzed strains using three dimensional FEM, we obtained bonding parameters and spring moduli of joints. Furthermore, we conducted FWD tests and calculated load transfer efficiency of joints. Results showed that structural evaluation of joints would be difficult by FWD deflection.

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