Two large and unique projects in different climates rely on hot-dipped galvanized reinforcement

February 10, 2021
HDG Reinforcement being placed for the Stoneham Arch Bridge 4 lane bridge deck.
HDG Reinforcement being placed for the Stoneham Arch Bridge 4 lane bridge deck.

From Canada to the Southeast United States, more transportation agencies are turning to hot dip galvanized (HDG) reinforcing steel because of its proven durability during fabrication and installation, 100-year design life due to a robust coating, and superior life-cycle costs.

The Ministry of Transportation Quebec specified hot dipped galvanizing for all steel components (beams, rebar, and cables) for the 2012 construction of the beautiful and award-winning Stoneham Arch Bridge in Stoneham, Quebec. The Ministry’s design firm, CIMA+, was concerned with economy in carrying out this project. With this in mind, the firm’s engineers designed a monolithic and continuous deck, without joints, from one abutment to the next. This choice was made in view of reducing maintenance costs of the structure and to ensure greater durability. Galvanized reinforcing steel was used for all elements to significantly extend the life of the structure at a very low cost. This decision was especially important for the arches, where any future repairs would be very complex due to the nature of the deck support elements. The province of Quebec has been specifying hot-dipped galvanized reinforcing steel for the past 30 years for their bridges. 

The South Carolina DOT specified HDG ASTM A767 Class 1 reinforcement for the construction of 10 new bridge structures—including two major flyovers—as part of the $240M I-85/I-385 Gateway Interchange Project in Greenville, South Carolina. The project replaced existing loop ramps with direct-connect, high-level flyover bridges and included construction of a new collector-distributor roadway along I-85 and I-385. The project included the design and construction of 12 new bridges, the rehabilitation of two existing bridges, and the construction of retaining walls. The new interchange is relieving congestion and increasing safety on the third busiest interchange in South Carolina. This was the state’s largest transportation infrastructure project in over a decade. The project was completed in 2020.

The Ministry of Transportation Quebec and the South Carolina DOT are to be commended for using HDG reinforcement in their continual efforts to optimize life-cycle costs. The Hot-dipped Galvanized Rebar Alliance is comprised of six hot-dip galvanizing companies situated along the east coast of Canada and the U.S., and serves all projects east of the Mississippi River.

The Alliance recommends the use of ASTM A767 Class 1 coating for all transportation projects as it provides superior value to epoxy and stainless-steel rebar. The Alliance recommends A767 Class 1 because the thickness of the coating is the primary factor in service life. In other words, the thicker the coating, the longer it provides corrosion projection.

To learn more about HDG A767 Class 1 and the Galvanized Rebar Alliance, visit our website at


Editor's Note: Scranton Gillette Communications and the SGC Infrastructure Group are not liable for the accuracy, efficacy and validity of the claims made in this piece. The views expressed in this content do not reflect the position of the Roads & Bridges' Editorial Team.