Tai Kwun (Old Central Police Station) Central

• CUSTOMER: Tai Kwn, HK Jockey Club.
• SECTOR: Heritage Preservation
• DATE: 2025

PRODUCTS:

• “FOSROC GALVASHIELD XP”
• “RENDEROC GP”
• “PROTECTOSIL CIT”

THE PROJECT

The Central Police Station is a walled compound of historic heritage buildings and courtyards located in Hong Kong’s Central District. Established by the British in 1841 as the colony’s main police station, magistracy, and prison, the site is one of Hong Kong’s most important remaining historical monuments.

For this important revitalization works, the preservation of the historic old concrete structure is an important part of this heritage preservation project. To ensure this old decade concrete can remain in good condition, the client discussed with Fosroc on proven conservation products.

THE SOLUTION

It is well known that for repairing old, contaminated concrete, new spalling concretes would be formed around the repaired areas, an effect known as “Incipient Anode Effect”. This is well documented in the EN 1504 Repair Standard and means that concrete repairs work need to be ongoing and never ends.

For this landmark preservation project, the client would not want to keep on the concrete repairs for every year or so. In such case, Fosroc Galvashield XP anode offers a perfect solution.

THE BENEFITS

The easy-to-use Galvashield XP product in Concrete Repairs, can effectively prevent the formation of new Corrosions around the Repair area, enable a durable long-lasting repairs.

Fosroc Galvashield anodes are comprised of high purity zinc cast with an enhanced alkail mortar which keep the zinc active over the life of the anode. It works on the principle of sacrificial protection. When two dissimilar metals are placed in an electrolyte (concrete), the most active metal (zinc) will sacrifice itself to protect the less active metal (steel reinforcements) against corrosion. The benefits are :

• Proven Technology - More than 20 years track records.
• Type 1A Anode - Alkali-activated to maintain activity of Zinc.
• Long lasting - Up to 20 years’ service life, reduce need for future repairs.

As a simple tied in anode during concrete repairs, the client found that the Fosroc Galvashield anode is easy to use and cost effective in providing a long-term concrete repairs solution.

“Fosroc Galvashield XP” anode used in the Corrosion Control works at Tai Kwun.

“Fosroc Galvashield XP” anode was simply tied in at the steel re-bars of the tunnel during repairs.

“Fosroc Galvashield Monitor Unit” to monitor current output and lifetime

“Fosroc Galvashield XP” anode proven to be an effective product to control steel reinforcement corrosions in concrete.