The Dos Hermanos Bridge structure, built in 1981, is one of the two ground-level links between the Islands of San Juan and Puerto Rico. As a result of the severe marine environment exposure conditions, a few years after its completion, the bridge showed signs of early deterioration including severe corrosion of the reinforcing steel in both, the cast-in-place and the precast prestressed structural members. CA performed a field condition survey and assessment of the structural integrity and safety of the structure including, among other things, destructive and non-destructive testing, determination of chloride ion penetration into the concrete as well as determining the location of existing reinforcement. Furthermore, a service life cost estimate analysis and predicted service life expectancy was prepared based on various modeling techniques considering the in-service conditions, implementation of different rehabilitation techniques, and the actual properties, characteristics, and performance of the concrete.

Dos Hermanos Bridge