Bridge expansion joints pose a special problem in the Washington State Department of Transportation (WSDOT) bridge deck management system. These devices are subject to repeated heavy dynamic loading, and premature failure has occurred in many cases.
It is WSDOT policy, as part of the Bridge Deck Management System, to make expansion joints watertight in order to reduce the potential of substructure corrosion induced by roadway deicing salts and other contaminants.
Expansion joint seals play an important role in keeping expansion joints watertight. A relatively new material, Evazote 50, looks promising in its performance characteristics as an expansion joint seal. It is able to accommodate considerable joint movement, its durability and corrosion resistant properties are excellent, and it is resistant to absorption of oils and greases. The purpose of this experimental project is to gain knowledge about the material's effectiveness over time and to gain knowledge about field installation techniques.
It was very beneficial to have the manufacturer's representative on the job during installation. This was required by special provision and is a practice that should be continued on future projects.
In-place performance will determine acceptance of Evazote 50 for general use.