This summary offers an overview of on a research study that assessed the magnitude of premature asphalt
deterioration on timber bridges; identified the primary mechanisms responsible for wear surface deterioration;
and suggested methods for improving asphalt pavement performance on timber bridges.
The study revealed that approximately 50 percent of counties experience some problems with premature
reduced serviceability of the asphalt pavement wear surfaces that cover their timber bridges. The summary
looks at possible pavement failure mechanisms and presents the following proposed solutions for controlling
timber bridge asphalt pavement cracking: asphalt pavement saw & seal, asphalt pavement fabric or material
underlay, removal of extruded oil-type preservative before surfacing, conditioning of bridge timbers to the
expected equilibrium moisture content before bridge installation, and tightening of timber decks through
Lange, Douglas A.; Larson, Timothy D.; Seavey, Robert.
Relationship Between Timber Bridge Characteristics and Asphalt Pavement Wear Surface Performance: Summary.
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