What Role Do Steel Plates and Concrete Jacketing Play in Bridge Rehabilitation Projects

Bridges face constant stress from traffic, temperature changes, and natural wear. Over time, they develop cracks, corrosion, and weak spots that reduce their load-carrying capacity. To keep these bridges in use and avoid major replacements, engineers carry out rehabilitation work. Two of the most common methods used in these projects are steel plate bonding and concrete jacketing.

Let us look at how these methods work and the role they play in strengthening bridges.

Why Do Bridges Need Rehabilitation With Steel Plates and Concrete Jacketing?

Many bridges have been in use for several decades. They may not meet current load requirements. Some of them may have been damaged by accidents, earthquakes, or poor maintenance. Rebuilding a bridge takes time, money, and usually disrupts public movement. That is why rehabilitation is often chosen.

Structural Reinforcements (refuerzos estructurales) are used to improve the performance of the existing bridge without rebuilding it. Steel plates and concrete jacketing are part of this process.

How Is Steel Plate Bonding Done?

The surface is cleaned to remove dust, rust, or loose particles. The steel plate is prepared and fixed using bolts or bonding material. The joint is then sealed to avoid moisture or air from getting trapped. This helps the plate stay fixed under load.

In structural reinforcements, steel plates are often added to increase bending strength or shear capacity. The method is simple and does not need major tools.

What Is Concrete Jacketing?

Concrete jacketing is a process where a new layer of concrete is added around an existing column, pier, or beam. This layer increases the size and strength of the original member. Steel bars are placed in the new layer to improve load resistance.

This method is used when the original section is too damaged or when higher strength is needed. It also helps protect the structure from future damage.

How Is Concrete Jacketing Applied?

First, the old surface is roughened. Then, steel reinforcement is placed around the member. A formwork is fixed, and fresh concrete is poured into the gap. After curing, the new jacket becomes part of the structure.

Concrete jacketing helps in both repair and protection. In structural reinforcements, it is widely used in bridge piers and support columns. It adds both size and strength without removing the old part.

When Is Each Method Used?

Steel plate bonding is used when there is minor to moderate damage. It is faster to install and works well for beams and girders. It does not add much weight.

Concrete jacketing is used when the damage is more serious. It is better for columns and piers that carry vertical loads. It adds weight, but it also adds strong protection.

Conclusion

Steel plate bonding and concrete jacketing are important tools in bridge rehabilitation. They help fix weak areas, add strength, and reduce the need for full replacements. These methods are practical, proven, and widely used.