Iowa System Of Bridge Deck Rehabilitation With Cathodic Protection
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Author | : Champak L. Narotam |
Publisher | : |
Total Pages | : 0 |
Release | : 1986 |
Genre | : Bridges |
ISBN | : |
Bridge deck and substructure deterioration due to the corrosive effects of deicing chemicals on reinforcing steel is a problem facing many transportation agencies. The main concern is protection of older bridges with uncoated reinforcing steel. Many different methods have been tried over the past years to repair bridge decks. The Iowa system of bridge deck rehabilitation has proven to be very effective. It consists of scarifying the deck surface, removing any deteriorated concrete, and overlaying with low slump dense concrete. Another rehabilitation method that has emerged is cathodic protection. It has been used for many years in the protection of underground pipelines and in 1973 was first installed on a bridge deck. Cathodic protection works by applying an external source of direct current to the embedded reinforcing steel, thereby changing the electrochemical process of corrosion. The corroding steel, which is anodic, is protected by changing it to a cathodic state. The technology involved in cathodic protection as applied to bridge decks has improved over the last 12 years. One company marketing new technology in cathodic protection systems is Raychem Corporation of Menlo Park, California. Their system utilizes a Ferex anode mesh that distributes the impressed direct current over the deck surface. Ferex mesh was selected because it seemed readily adaptable to the Iowa system of bridge deck rehabilitation. The bridge deck would be scarified, deteriorated concrete removed, Ferex anode mesh installed, and overlaid with low slump dense concrete. The Federal Highway Administration (FHWA) promotes cathodic protection under Demonstration Project No. 34, "Cathodic Protection for Reinforced Concrete Bridge Decks."
Author | : Champak L. Narotam |
Publisher | : |
Total Pages | : 54 |
Release | : 1993 |
Genre | : Bridges |
ISBN | : |
Bridge deck deterioration due to corrosive effect of deicers on reinforcing steel is a major problem facing many agencies. Cathodic protection is one method used to prevent reinforcing steel corrosion. The application of a direct current to the embedded reinforcing steel and a sacrificial anode protects the steel from corrosion. This 1992 project involved placing an Elgard Titanium Anode Mesh Cathodic Protection System on a bridge deck. The anode was fastened to the deck after the Class A repair-work and the overlay was placed using the Iowa Low Slump Dense Concrete System. The system was set up initially at 1 mA/sq ft.
Author | : John G. Russo |
Publisher | : |
Total Pages | : 22 |
Release | : 1986 |
Genre | : Concrete bridges |
ISBN | : |
Author | : Andrew D. Halverson |
Publisher | : |
Total Pages | : 60 |
Release | : 1985 |
Genre | : Concrete bridges |
ISBN | : |
Author | : |
Publisher | : |
Total Pages | : 294 |
Release | : 1985 |
Genre | : Technology & Engineering |
ISBN | : |
The conference focused on the major problem facing highway and bridge engineers: deterioration of concrete bridge decks caused by corrosion of the reinforcing steel. The conference was aimed primarily at giving bridge owners and engineers an understanding of cathodic protection as the only means to stop corrosion on bridge decks.
Author | : |
Publisher | : |
Total Pages | : 67 |
Release | : 1988 |
Genre | : Concrete bridges |
ISBN | : |
Author | : Federal Highway Administration |
Publisher | : |
Total Pages | : 67 |
Release | : 1988 |
Genre | : |
ISBN | : |
Author | : Jack E. Bennett |
Publisher | : Strategic Highway Research Program (Shrp) |
Total Pages | : 316 |
Release | : 1993 |
Genre | : Technology & Engineering |
ISBN | : |
This document provides explanation, guidance, and direction concerning cathodic protection of concrete bridge elements to the highway engineer who wants to incorporate cathodic protection in a bridge project. The manual which provides background information on corrosion fundamentals, is divided into 3 parts: design, construction, and operation and maintenance. An appendix provides standard specifications for cathodic protection systems for both decks and substructures. The document is intended to be a useful reference for engineers who design and prepare specifications or who oversee turnkey operations.
Author | : Carey L. Younger |
Publisher | : |
Total Pages | : 52 |
Release | : 1994 |
Genre | : Concrete bridges |
ISBN | : |
Author | : MATCOR, Inc |
Publisher | : |
Total Pages | : 28 |
Release | : 1977 |
Genre | : Bridges |
ISBN | : |