The Washington State Department of Transportation will be conducting experimental field testing of several selected polymer concrete thin (1/4 inch) overlays over a ten-year period. The polymer concrete material is manufactured by private industry firms and installed on selected bridge decks under standard WSDOT construction contracts. Approximately 21 bridges will be involved in the experiment; eight of these are included in federal participating projects as experimental features.
The Grays River Bridge at Rosburg Washington, Bridge No. 403/7, is the second bridge of the federal aid projects to receive a thin polymer concrete overlay. The polymer concrete used was Degadur 330, made by Degussa Company and installed by Cal Floor. The deck was overlaid in August of 1986.
Work on the thin overlay began on August 4, 1986 and was completed on August 5, 1986. A total of 586 S.Y. of overlay was placed. There was no traffic on the bridge during the overlay placement. The overlay contractor had a well-trained crew and the overlay placement went very smoothly. The crew's experience showed when the different operations of primer, overlay, and sealer were sequenced so that when one layer cured out, the next operation was ready to go.
Friction tests and electrical resistivity tests were all satisfactory.