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Protective coatings on concrete surfaces : Madden Macryseal : experimental feature : final report.
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1985-02-01
[PDF-308.13 KB]
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Abstract:The intrusion of salt-laden moisture into concrete bridge members has caused considerable damage to bridges along the Oregon coast. The increasing chloride ion content of the concrete fosters a galvanic corrosion cell. This results in the rapid corrosion of the reinforcing steel and the spalling of the concrete. To prevent the intrusion of chloride ions into the concrete, the Oregon State Highway Division specifications call for a concrete sealer on select concrete members on coastal bridges.
When the Yachats River Bridge (on US 101 in Lincoln County, Oregon) was constructed in 1977, the contractor requested permission to use Macryseal, supplied by Madden Construction Supply (Portland, Oregon). Since Macryseal was not an approved sealer, preliminary tests were done by the Research Section of the Oregon State Highway Division. These tests indicated that Macryseal provided protection that was comparable to that provided by the sealers already approved. Therefore, permission was granted to use Macryseal and a program to evaluate its performance was scheduled.
The Yachats River Bridge carries two lanes of traffic on a 2-1/2 inch asphalt concrete wearing surface. The bridge is 223 feet long and consists of two prestressed concrete slab approach spans and a prestressed concrete bulb-T main span. The Pacific Ocean (the breakers are only several hundred yards away) provides a salt-rich spray which coats the bridge.
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