Construction of the new Tacoma Narrows Bridge (TNB) included a steel orthotropic bridge deck. The higher flexibility of an orthotropic deck causes pavement placed upon it to fatigue and crack more quickly than pavement placed on a normal roadway. The HMA overlay placed on the new bridge incorporated Trinidad Lake Asphalt (TLA) to help resist the stresses of an orthotropic deck. The basis of this report is to evaluate the short and long-term performance of the HMA overlay with TLA binder used on the TNB. This report provides background information on orthotropic bridge deck overlay construction practices and documents the construction of the overlay on the TNB. Annual summary reports over the next five years will document any changes in the performance of the overlay. A final report will summarize performance characteristics and future recommendations for use of this process.
Washington (State). Dept. of Transportation. Materials Laboratory
Bridge decks, Orthotropic plates, Hot mix paving mixtures, Bituminous overlays, Binders, Pavement performance, Evaluation and assessment, Construction management.