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Sika Galvashield XP, Type 1A Embedded Galvanic Anodes, Interior & Exterior

Sika Galvashield XP, Type 1A Embedded Galvanic Anodes, Interior & Exterior

Surface Treatments
SIKA

Sika is a global leader in specialty chemicals for the construction and industrial sectors. The company develops and supplies innovative products and systems for bonding, sealing, damping, reinforcing, and protecting structures. With a strong focus on sustainability and performance, Sika serves a wide range of applications including concrete production, waterproofing, roofing, flooring, and structural strengthening.

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General Specifications
Packaging 50 units per box; 6.8 kg - 25 mm x 31 mm x 64 mm
Usage Embedded anodes for concrete repair longevity (e.g. joints, slabs, epoxy rebar)
Chemical Base Embedded galvanic anode (zinc-based)
Usage Area Exterior & Interior
Color N/A
Storage Conditions Store in original unopened, sealed and undamaged packaging in dry and cool conditions. Avoid extremes of temperature and humidity
Density N/A
Consumption N/A

Type 1A Discrete Embedded Galvanic Anode Range for Corrosion Prevention

Sika Galvashield XP Range is available in five sizes: Compact / XPT / XP2 / XP4 / XPX embedded galvanic anodes are used in concrete repair and rehabilitation to prevent the formation of new corrosion sites adjacent to completed patch repairs. Designed for optimum performance and ease of installation, the alkali-activated (Type 1A) anodes are comprised of high purity zinc core that is activated by the surrounding specially formulated cementitious mortar with an internal pH of >14 which keeps the zinc active over the life of the anode. The anode is quickly and easily fastened to the exposed reinforcing steel using the contractor-friendly One-and-Done™ single-wire connecton. Once installed, the zinc core corrodes preferentially to the surrounding reinforcement, thereby providing galvanic corrosion prevention to the adjacent reinforcing steel and mitigating ‘ring anode corrosion' or the 'halo effect'.

  • Proven technology - supported by independent test programme.
  • Sika Galvashield XP is the original embedded galvanic anode with an extensive 20-year track record.
  • Type 1A anode - alkali-activated to maintain activity of the zinc; meets building code requirements that prohibit intentionally added constituents that are corrosive to reinforcement with the repair area.
  • Easy to install - innovative single wire One-and-Done™ connection can be installed twice as fast as traditional two wire connections, saving up to 50% on installation labour costs.
  • Focused protection - provides localised corrosion protection where it is needed the most, at the interface of the repair and the remaining contaminated concrete.
  • Cast zinc core - provides high anode utilisation and a secure long-term connection between the zinc and the integral lead wire.
  • BarFit™ design - grooved edges on Sika Galvashield XP2, XP4 and XPX anodes assist with secure anode placement.
  • Steel connection wires - provides dependable steel-to-steel contact with no intermediate materials (e.g. galvanising) that may impede the long-term electrical connection.
  • Economical - provides localised protection where it is needed the most, at the interface between the repair and the remaining contaminated concrete.
  • Versatile - effective in chloride-contaminated and carbonated concrete containing chlorides. Can be used for both conventionally reinforced and prestressed or post-tensioned concrete.
  • User friendly - installation is quick and easy, requiring no special equipment or training.
  • Low maintenance – requires no external power source or system monitoring.
  • Measurable – anode performance can be easily monitored if required.
  • Does not cause hydrogen embrittlement.
  • ICRI CSP-3 (Concrete Surface Profile) - raised ridges provide increased surface profile to promote mechanical bond between repair mortars and concrete.
  • Does not cause hydrogen embrittlement.
  • Long lasting – minimum 20 year anode service life* when using standard design tables, reduces the need for future repairs.
  • Full System – can be used in conjunction with Sika FerroGard and Sikagard technologies to offer a total corrosion management system.
Usage
Sika Galvashield XP anodes may only be used by experienced professionals. 
  • Patch repairs. 
  • Interfaces between new and existing concrete. 
  • Slab replacements. 
  • Expansion joint repairs. 
  • Repair of epoxy-coated rebar. 
  • Bridge widening and other structural modifications. 
  • Repair of pre-stressed and post-tensioned concrete. 
  • Mitigates ring anode formation (i.e. the 'halo effect') in concrete repairs. 
  • Extends the life of concrete and joint repairs. 
 
Advantages
  • Proven technology - supported by independent test programme.  
  • Sika Galvashield XP is the original embedded galvanic anode with an extensive 20-year track record.
  • Type 1A anode - alkali-activated to maintain activity of the zinc; meets building code requirements that prohibit intentionally added constituents that are corrosive to reinforcement with the repair area. 
  • Easy to install - innovative single wire One-and-Done™ connection can be installed twice as fast as traditional two wire connections, saving up to 50% on installation labour costs.  
  • Focused protection - provides localised corrosion protection where it is needed the most, at the interface of the repair and the remaining contaminated concrete.
  • Cast zinc core - provides high anode utilisation and a secure long-term connection between the zinc and the integral lead wire. 
  • BarFit™ design - grooved edges on Sika Galvashield XP2, XP4 and XPX anodes assist with secure anode placement. 
  • Steel connection wires - provides dependable steel-to-steel contact with no intermediate materials (e.g. galvanising) that may impede the long-term electrical connection. 
  • Economical - provides localised protection where it is needed the most, at the interface between the repair and the remaining contaminated concrete.
  • Versatile - effective in chloride-contaminated and carbonated concrete containing chlorides. Can be used for both conventionally reinforced and prestressed or post-tensioned concrete.
  • User friendly - installation is quick and easy, requiring no special equipment or training.
  • Low maintenance – requires no external power source or system monitoring.
  • Measurable – anode performance can be easily monitored if required.
  • Does not cause hydrogen embrittlement.
  • ICRI CSP-3 (Concrete Surface Profile) - raised ridges provide increased surface profile to promote mechanical bond between repair mortars and concrete. 
  • Does not cause hydrogen embrittlement.
  • Long lasting – minimum 20 year anode service life* when using standard design tables, reduces the need for future repairs.
  • Full System – can be used in conjunction with Sika FerroGard and Sikagard technologies to offer a total corrosion management system.
 
  • Independent testing - indicates concrete repair service life can be extended by more than 400%.
         * As with all galvanic protection systems, service life is dependent upon a number of factors including reinforcing steel density, concrete conductivity, chloride concentration, humidity and anode spacing. 
Packaging

Sika Galvashield XP Compact

50 units per box

6.8 kg box

Sika Galvashield XPT

50 units per box

9.1 kg box

Sika Galvashield XP2

40 units per box

10.2 kg box

Sika Galvashield XP430 units per box12.0 kg box
Sika Galvashield XPX20 units per box13.6 kg box
Technical Information
Design Considerations

Table 1 - Design Criteria: 

Corrosion Risk Category

Chloride Content***

Minimum Current Density at 20 Years

Low to Moderate

<0.8%

0.4mA/m2

High

0.8 to 1.5%

0.8mA/m2

Extremely High

>1.5%

1.6mA/m2

*** Chloride content is calculated as a percentage by weight of cement. 

Anode Spacing

The following anode spacing guidelines are based on achieving the minimum current density for the appropriate corrosion risk category 20 years after installation.

NOTE: In warmer or more demanding conditions (such as marine environments), Sika Galvashield XPX anodes are recommended to achieve the 20 year anode life. 

Table 2 - Maximum Anode Spacing for New Construction and Carbonated Concrete:

Steel Density Ratio*

Sika Galvashield XPT / Sika Galvashield XP Compact**

Sika Galvashield XP2

Sika Galvashield XP4 / XPX

<0.3700 mm700 mm700 mm
0.31 to 0.60700 mm700 mm700 mm
0.61 to 0.90580 mm700 mm700 mm
0.91 to 1.20500 mm700 mm700 mm
1.21 to 1.50440 mm680 mm700 mm
1.51 to 1.80400 mm600 mm700 mm
1.81 to 2.10370 mm560 mm700 mm

* Steel surface area / concrete surface area.

** Sika Galvashield XP Compact may have reduced life due to reduced zinc mass (40g). 

       

Table 3 - Maximum Anode Spacing for Low to Moderate Corrosion Risk (Chloride Content <0.8%***):

Steel Density Ratio*Sika Galvashield XPT / Sika Galvashield XP Compact**Sika Galvashield XP2Sika Galvashield XP4 / XPX
<0.3675 mm700 mm700 mm
0.31 to 0.60450 mm700 mm700 mm
0.61 to 0.90350 mm575 mm700 mm
0.91 to 1.20300 mm475 mm625 mm
1.21 to 1.50275 mm425 mm550 mm
1.51 to 1.80250 mm375 mm500 mm
1.81 to 2.10225 mm350 mm475 mm

* Steel surface area / concrete surface area.

** Sika Galvashield XP Compact may have reduced life due to reduced zinc mass (40g). 

*** Chloride content is calculated as a percentage by weight of cement. 

       

Table 4 - Maximum Anode Spacing for High Corrosion Risk (Chloride Content 0.8% to 1.5%***):

Steel Density Ratio*

Sika Galvashield XPT / Sika Galvashield XP Compact**

Sika Galvashield XP2

Sika Galvashield XP4 / XPX

<0.3450 mm700 mm700 mm
0.31 to 0.60300 mm475 mm625 mm
0.61 to 0.90250 mm375 mm500 mm
0.91 to 1.20200 mm325 mm425 mm
1.21 to 1.50175 mm275 mm375 mm
1.51 to 1.80150 mm250 mm350 mm
1.81 to 2.10125 mm225 mm325 mm

* Steel surface area / concrete surface area.

** Sika Galvashield XP Compact may have reduced life due to reduced zinc mass (40g). 

*** Chloride content is calculated as a percentage by weight of cement. 

     

 

Table 5 - Maximum Anode Spacing for Extremely High Corrosion Risk (Chloride Content >1.5%***):

Steel Density Ratio*

Sika Galvashield XPT / Sika Galvashield XP Compact**

Sika Galvashield XP2

Sika Galvashield XP4 / XPX

<0.3300 mm475 mm625 mm
0.31 to 0.60200 mm325 mm425 mm
0.61 to 0.90175 mm250 mm350 mm
0.91 to 1.20150 mm225 mm275 mm
1.21 to 1.50125 mm175 mm250 mm
1.51 to 1.80100 mm150 mm225 mm
1.81 to 2.10N/A125 mm200 mm

* Steel surface area / concrete surface area.

** Sika Galvashield XP Compact may have reduced life due to reduced zinc mass (40g). 

*** Chloride content is calculated as a percentage by weight of cement.

        

NOTE: Spacing should be reduced for continuously wet substrates to extend the expected service life of the anode. Where stirrups in beams or columns are exposed, place a Sika Galvashield XPT / XP2 / XP4 / XPX anode at each stirrup location. Spacings are based on an average annual temperature of 10°C.