BRIDGE DECK DETERIORATION AND RESTORATION. INVESTIGATION NO. 639
One of the most serious and costly problems presently facing highway agencies is premature deterioration of concrete bridge decks. The cause has now been linked to deicing chemical "chloride" induces corrosion of the reinforcement. In some cases bridge decks designed to last 40 years have required major repairs after only 10 years of service due to corrosion related "chuckholing" or spalling. Mn/DOT has become increasingly aware of this problem during the last 5 years and has initiated a comprehensive program to resolve it. The two basic approaches to solving the problem are to: 1) Keep the salt and moisture out of the decks with protective overlays and membranes, modified concretes or sealers. 2) Protect the steel from corrosion once the concrete's protective nature has been destroyed by chloride contamination, using epoxy and zinc coatings. Bridge decks were constructed or reconstructed using protective membranes, modified concretes and coated bars. Testing and evaluation consists of visual observations, delamination detection, chloride content testing, depth of concrete cover over rebars and electrical potential measurement. /Author/
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Corporate Authors:
Minnesota Department of Transportation
395 John Ireland Boulevard
St Paul, MN United States 55155 -
Authors:
- Tracy, R G
- Publication Date: 1976-12
Media Info
- Features: Figures; References; Tables;
- Pagination: 50 p.
Subject/Index Terms
- TRT Terms: Bridge decks; Bridge design; Bridges; Chlorides; Coatings; Concrete; Corrosion protection; Deicing chemicals; Delamination; Deterioration; Material reinforcement; Moisture content; Sealing compounds; Spalling; Structural design
- Subject Areas: Bridges and other structures; Highways; Maintenance and Preservation;
Filing Info
- Accession Number: 00165815
- Record Type: Publication
- Source Agency: National Technical Information Service
- Report/Paper Numbers: Intrm. Rpt
- Files: TRIS, STATEDOT
- Created Date: Jan 13 1978 12:00AM