Construction of Underwater Concrete with Segregation Control Admixture on Foundation of Bridge

Access Bridge for Kansai International Airport

Abstract

In the construction of the access bridge substructure for Kansai International Airoport, underwater concrete with S.C.A. (Segregation Control Admixture) is used for fixing a prefabricated pier on steel pipe piles which was driven. The underwater concrete with S.C.A. has the following advantages. First, it is controlled to prevent segregation inwater. Second, it keeps strength deterioration underwater at minimum. Third, it is uniform in quality, and has good flowability, fillability and bond strength, that is good for execution of work. The present paper refer mainly to the result of examination in mix proportion test and execution control test, and mix design, quality control and execution control in making use of mass underwater concrete with S.C.A. in construction work.