Design Table 1 - Design Criteria:
Corrosion Risk Category | Chloride Content* | Minimum Current Density at 20 Years** |
Low to Moderate | <0.8% | 0.6mA/m2 |
High | 0.8 to 1.5% | 1.2mA/m2 |
Extremely High | >1.5% | 2.4mA/m2 |
* Chloride content is calculated using percentage by weight of cement.
** Design current densities for Sika Galvashield CCX anodes are double the standard current densities at 20 years.
Design Table 2 - Unit Sizes and Minimum Hole Sizes:
Anode Type | Unit Size: diameter x length (mm) | Minimum Hole Size: diameter x depth (mm) |
Sika Galvashield CC2 | 32 x 75 | 40 x 105 |
Sika Galvashield CC4 | 36 x 100 | 45 x 130 |
Sika Galvashield CCX | 46 x 115 | 56 x 145 |
Anode Spacing
The following Tables provide guidelines for achieving the minimum current density for the appropriate corrosion risk category as stated, 20 years after installation.
NOTE: In warmer or more demanding conditions (such as marine environments), Sika Galvashield CCX anodes are recommended to achieve the 20 year anode life.
Design Table 3 - Low to Moderate Corrosion Risk (Chloride Content* <0.8% or Carbonated Concrete):
Steel Density Ratio | Sika Galvashield CC2 | Sika Galvashield CC4 / CCX |
(Steel Surface Area / Concrete Surface Area) | Maximum Grid Dimensions (mm) | Maximum Grid Dimensions (mm) |
<0.30 | 650 | 700 |
0.31 - 0.60 | 475 | 675 |
0.61 - 0.90 | 375 | 550 |
0.91 - 1.20 | 325 | 475 |
1.21 - 1.50 | 300 | 425 |
1.51 - 1.80 | 250 | 375 |
1.81 - 2.10 | 225 | 350 |
* Chloride content is calculated using percentage by weight of cement.
Design Table 4 - High Corrosion Risk (Chloride Content* 0.8 - 1.5%):
Steel Density Ratio | Sika Galvashield CC2 | Sika Galvashield CC4 / CCX |
(Steel Surface Area / Concrete Surface Area) | Maximum Grid Dimensions (mm) | Maximum Grid Dimensions (mm) |
<0.30 | 475 | 600 |
0.31 - 0.60 | 325 | 475 |
0.61 - 0.90 | 275 | 375 |
0.91 - 1.20 | 250 | 325 |
1.21 - 1.50 | 225 | 300 |
1.51 - 1.80 | 200 | 275 |
1.81 - 2.10 | 175 | 250 |
* Chloride content is calculated using percentage by weight of cement.
Design Table 5 - Extremely High Corrosion Risk (Chloride Content* >1.5%):
Steel Density Ratio | Sika Galvashield CC2 | Sika Galvashield CC4 / CCX |
(Steel Surface Area / Concrete Surface Area) | Maximum Grid Dimensions (mm) | Maximum Grid Dimensions (mm) |
<0.30 | 340 | 475 |
0.31 - 0.60 | 240 | 335 |
0.61 - 0.90 | 195 | 275 |
0.91 - 1.20 | 170 | 235 |
1.21 - 1.50 | 150 | 210 |
1.51 - 1.80 | 135 | 195 |
1.81 - 2.10 | 125 | 180 |
* Chloride Content is based on percentage by weight of cement.
NOTE: For structures in high or extremely high corrosion risk environments that have high steel density ratios requiring close anode spacings, Sika Galvashield Fusion anode systems are typically more economical.