In this study, separation and cracking behavior under fatigue loading of filling concrete in joints between precast deck slab panels was experimentally investigated. And we proposed improving methods of fatigue durability applying adhesive on the end surface of precast slab joints. Wheel load running fatigue tests were conducted to verify validity of our proposed method. The fatigue tests revealed that the case of with adhesive suppresses cracking due to peeling and fatigue durability was improved by 1.2 times by using an adhesive. In addition, effect of deflection range on fatigue durability was clarified from the results of dynamic measurements of deflection.
