Tsing Ma Bridge, Hong-Kong
The Tsing Ma Bridge in Hong Kong designed by Mott MacDonald stands as a monumental feat of engineering, connecting the islands of Tsing Yi and Ma Wan. Completed in 1997, the bridge became known as the world’s longest suspension bridge to carry both road and rail traffic on two levels, with a main span of 1,377 meters. Beyond its structural significance, engineers have preserved its longevity and visual appeal by applying advanced protective treatments.
The Challenge: Environmental Exposure
Chloride ions in saltwater penetrate reinforced concrete and attack the steel reinforcement, which leads to cracking, spalling, and structural failure. While concrete provides an alkaline environment that protects embedded steel, saltwater disrupts this protective film, allowing corrosion to begin. Concrete’s permeability speeds up the process because it allows moisture, oxygen, and salts to reach the steel. These elements cause the steel to rust and expand. As a result, the expanding steel damages the surrounding concrete.
The Tsing Ma Bridge, now a major tourist destination and scenic landmark, needed ongoing protection to maintain both its appearance and structural performance. To stop water ingress and prevent salt‑induced corrosion in its reinforced concrete pylons and decks, the maintenance team applied Tech‑Dry Solid Silane as a targeted protective treatment.
The Solution: Tech-Dry Solid Silane Treatment
To mitigate these risks, the bridge’s concrete pylons and decks were treated with Tech-Dry Solid Silane, a water-repellent solution. This topical silicone cream is designed to penetrate deeply into concrete surfaces, forming a protective barrier that resists water ingress and chloride penetration. In marine environments, it offers an added advantage because it prevents run‑off and avoids contaminating the surrounding areas.
Enhanced Durability and Aesthetic Preservation
The application of Tech-Dry Solid Silane has proven effective in preserving the Tsing Ma Bridge’s structural integrity and visual appeal. By blocking moisture and chloride ingress, the treatment reduces the risk of corrosion‑related damage. This reduction in damage also minimises maintenance costs and downtime. In addition, the treatment helps preserve the bridge’s visual qualities, allowing it to remain both a landmark and a vital transportation link in Hong Kong.
The Tsing Ma Bridge highlights the vital role of proactive maintenance in preserving critical infrastructure. By strategically applying Tech-Dry Solid Silane, its concrete structures are shielded from the damaging effects of marine exposure. This approach demonstrates the value of advanced protective treatments in enhancing durability and extending the lifespan of infrastructure exposed to harsh environmental conditions.
To discuss how Tech-Dry solutions can support your next project, contact the team for expert guidance.