ABSTRACT
In this study, polypropylene fiber (PPF) was utilized in the RC slab of Shinyanagibuchi Bridge in Fudai village of Iwate prefecture, in order to prevent the hazards for the third party as the flaking of concrete. The deicing salt scaling resistance and the air void characteristics of mock and actual RC bridge slabs under each construction stage were investigated. The results showed that the dosage of expansive agent (EA) has little influence on deicing salt scaling resistance of concrete. PP fiber can improve the anti-scaling performance of concrete surfaces, however, the curing methods of fiber concrete would be one of the significant factors to determine the surface scaling resistance. It can be confirmed that the void frequency is one of significant factors for evaluating the spacing factor of concrete. Moreover, the NDT test in-situ shows that the actual RC slab has fine compactness. All in all, the considerable results in this study can be provided by tasking the mock RC slab for practical improvement of the actual RC slab. In addition, the rise of target air content, the using PPF and the adequate wet curing period would be contributed to make durable concrete for scaling resistance of concrete.
