A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Exodermic Bridge Deck Performance Evaluation
In 1998, the Wisconsin DOT completed a two leaf bascule bridge in Green Bay with an exodermic deck system. The exodermic deck consisted of 4.5 in thick cast in place reinforced concrete supported by a 5.19 in tall unfilled steel grid. The concrete and steel grid were made composite via shear stud connectors. The bridge deck was evaluated several times during its first 12 years in service. During and immediately following the 7 day wet cure of the concrete, shrinkage cracks formed. The cracking stabilized after several months and has not increased. The cracks were sealed with an epoxy-based material. In 2003, a white substance was noted on the underside of the exodermic deck. This leached material was sampled, and its primary component was determined to be zinc oxide. It is likely that deicing solution leached through the cracks in the deck and caused sacrificial corrosion of the galvanized steel grid. The white material was still present in 2010, and at that time, isolated areas of corroded steel were noted as well. City maintenance personnel have not noted any additional problems with the exodermic bridge deck system. A comparison of the exodermic bridge deck system to a similar bridge with an open grid steel deck indicated that the initial cost of the two systems were within ten percent of each other. It is recommended that the exodermic bridge deck system be considered for future use in Wisconsin. However, care should be taken in the design of the concrete mixture and reinforcement layout so that cracking in the deck is minimized.
Exodermic Bridge Deck Performance Evaluation
In 1998, the Wisconsin DOT completed a two leaf bascule bridge in Green Bay with an exodermic deck system. The exodermic deck consisted of 4.5 in thick cast in place reinforced concrete supported by a 5.19 in tall unfilled steel grid. The concrete and steel grid were made composite via shear stud connectors. The bridge deck was evaluated several times during its first 12 years in service. During and immediately following the 7 day wet cure of the concrete, shrinkage cracks formed. The cracking stabilized after several months and has not increased. The cracks were sealed with an epoxy-based material. In 2003, a white substance was noted on the underside of the exodermic deck. This leached material was sampled, and its primary component was determined to be zinc oxide. It is likely that deicing solution leached through the cracks in the deck and caused sacrificial corrosion of the galvanized steel grid. The white material was still present in 2010, and at that time, isolated areas of corroded steel were noted as well. City maintenance personnel have not noted any additional problems with the exodermic bridge deck system. A comparison of the exodermic bridge deck system to a similar bridge with an open grid steel deck indicated that the initial cost of the two systems were within ten percent of each other. It is recommended that the exodermic bridge deck system be considered for future use in Wisconsin. However, care should be taken in the design of the concrete mixture and reinforcement layout so that cracking in the deck is minimized.
Exodermic Bridge Deck Performance Evaluation
J. Battaglia (author)
2010
20 pages
Report
No indication
English
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