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    Author(s): Richard E. Weyers; Joseph R. Loferski; J. Daniel Dolan; John E. Haramis; Joseph H. Howard; Lola Hislop
    Date: 2001
    Source: Gen. Tech. Rep. FPL-GTR-123. Madison, WI: U.S. Department of Agriculture, Forest Service, Forest Products Laboratory. 15 p.
    Publication Series: General Technical Report (GTR)
    Station: Forest Products Laboratory
    PDF: View PDF  (557 KB)

    Description

    To enhance long-term timber bridge performance, timber material must be protected from moisture. Wearing surfaces made of asphalt pavement with and without a waterproof membrane have been used to provide protection from moisture on timber decks. This type of wearing surface also protects the deck from other damage while providing a smooth, skid-resistant surface. However, the long-term performance of timber bridges has often not been satisfactory as a result of cracking of the wearing surface or separation of the asphalt or membrane from the deck. Cracking or separation allows moisture migration to the timber deck and decreases ride quality. To improve the performance of a wearing surface, it must be designed, installed, and maintained properly. This document provides guidelines for the proper design, installation, and maintenance of a waterproof wearing surface for timber bridge decks. The design section includes material descriptions and asphalt mixture recommendations. The installation section presents material testing, field inspection, detailed drawings, and errors to avoid. The maintenance section explains the typical signs of distress and corrective procedures.

    Publication Notes

    • We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
    • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.

    Citation

    Weyers, Richard E.; Loferski, Joseph R.; Dolan, J. Daniel; Haramis, John E.; Howard, Joseph H.; Hislop, Lola. 2001. Guidelines for design, installation, and maintenance of a waterproof wearing surface for timber bridge decks. Gen. Tech. Rep. FPL-GTR-123. Madison, WI: U.S. Department of Agriculture, Forest Service, Forest Products Laboratory. 15 p.

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    Keywords

    Timber bridges, performance, wearing surface, asphalt, pavement, waterproof membrane

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https://www.fs.usda.gov/treesearch/pubs/9687