The PatchGuard™ Connect Galvanic Anode

The system is an inter-connected sacrificial anode system which acts to control corrosion of reinforcing steel in concrete. PatchGuard Connect is used to control corrosion and mitigate cracking and spalling of sound but contaminated concrete where a corrosion risk has been identified.

Advantages

  • Extends the life of the asset
  • No need to breakout sound contaminated Concrete 
  • Can be adapted to comply with BS EN ISO 12696 [2016] standard for Cathodic protection of steel in concrete. 
  • Targeted protection 
  • Measurable performance
  • Up to 20 years protection

PatchGuard™ connect anodes corrode preferentially to the surrounding steel and protecting it from further corrosion damage.

Problem

PatchGuard™ Connect combats the two main types of corrosion found in reinforced concrete structures

Carbonation induced – exposure to atmospheric carbon dioxide combined with prolonged contact to sufficient moisture and oxygen can leave steel vulnerable to corrosion.

Chloride induced – if chloride in the form of inherently mixed set accelerators or external aggressive salts permeates reinforced concrete in sufficient quantities, an aggressive form of corrosion can be initiated.

When either or both of these take hold in a structure, this can lead to the concrete cracking and being displaced as the steel reinforcement expands and exerts pressure causing a spalling effect. The corrosion and its effects often propagate very quickly – so it is crucial to be proactive in assessing and fixing the issue to protect the structure and maintain its asset value.

PatchGuard™ Connect Anodes

PatchGuard Connect anode will corrode preferentially to the surrounding steel, offering protection against future corrosion damage. Areas of sound concrete that are suffering from corrosion as a result of chloride or carbonated contamination but not yet warrant concrete repair interventions, can be protected from future damage by the installation of a targeted system.

PatchGuard Connect control system comprises of zinc alloy units, XLPE titanium connecting wire, polymeric screw connectors and DuoCrete activating paste.

 

 

Product Diameter Length Zinc Weight
PatchGuard Connect- 175 18mm 42mm 62g
PatchGuard Connect -350 18mm 77mm 120g
PatchGuard Connect -400 18mm 95mm 160g
PatchGuard Connect -500 18mm 115mm 180g

Installation

PatchGuard™ connect anodes are installed into contaminated areas of reinforced concrete, identified as being at risk of corrosion, by simply drilling 25mm diameter holes and embedding the anodes in DuoCrete PG mortar. Anodes are connected to the titanium feeder wire with a single connection to the reinforcement. Chases are cut within the concrete to recess the titanium feeder wire. The system is discrete with no surface wiring or permanent control systems, typically strings of up to 40 anodes is possible. However, the system can be adapted to comply with BS EN ISO 126696 standard for cathodic protection of steel in concrete.

PatchGuard Connect anodes are connected in rows/grids which are locally connected to the primary reinforcement.

How it works

The Patchguard Connect system is used to control corrosion and mitigate cracking and spalling of sound but contaminated concrete where a corrosion risk has been identified but no propagation or spalling of the concrete has occurred at this stage. The system is an inter-connected sacrificial anode system which acts to control corrosion of reinforcing steel in concrete. Protective current is delivered directly to the steel which is at greatest corrosion risk.