Sika® FerroGard®-908
Dual functional surface applied corrosion inhibitor and penetrating sealer for reinforced concrete
Sika® FerroGard®-908 is designed to be applied to the concrete surface. Sika® FerroGard®-908 penetrates the concrete and mitigates active corrosion and/or delays the onset of corrosion.
- Passes - USBR M-82 Corrosion Mitigation Test Protocol
- Significantly reduces active corrosion due to chlorides and or carbonation, even in cracked concrete
- Increases the resistivity of the reinforced concrete
- Enhances the durability of reinforced concrete
- Long term efficiency, deep penetration
- Does not require concrete removal
- Repels additional water and chloride ions
- Contains amino alcohol corrosion inhibitor
- Ready to use and easily applied by spray or roller
- Adds additional benefits when used prior to protective coatings in concrete restoration systems
- Not a vapor barrier; allows vapor diffusion
- Proven effective per ASTM G109/Cracked Beams
- Increases the resistance of concrete to freeze and thaw cycles and de-icing salts
Usage
Sika® FerroGard®-908 is recommended for steel-reinforced concrete, pre-stressed, precast, post tensioned concrete or concrete in marine environments. Common applications include:- Bridges and highways exposed to corrosive environments (deicing salts, weathering)
- Building facades and balconies
- Parking garages
- Piers, piles, and concrete dock structures
- Vertical, horizontal and overhead surfaces
- As part of Sika’s system approach for buildings and civil engineering
Advantages
- Passes - USBR M-82 Corrosion Mitigation Test Protocol
- Significantly reduces active corrosion due to chlorides and or carbonation, even in cracked concrete
- Increases the resistivity of the reinforced concrete
- Enhances the durability of reinforced concrete
- Long term efficiency, deep penetration
- Does not require concrete removal
- Repels additional water and chloride ions
- Contains amino alcohol corrosion inhibitor
- Ready to use and easily applied by spray or roller
- Adds additional benefits when used prior to protective coatings in concrete restoration systems
- Not a vapor barrier; allows vapor diffusion
- Proven effective per ASTM G109/Cracked Beams
- Increases the resistance of concrete to freeze and thaw cycles and de-icing salts
Packaging
5 gal. (19 L) pails, 55 gal. (208 L) drums
Color
Clear
Product Details
Chemical Base
Alkylalkoxy Silane
Shelf Life
24 months from date of production if stored properly in original, unopened and undamaged sealed packaging
Storage Conditions
Store in unopened, undamaged and original sealed packaging in dry and cool conditions. Condition material between 40 °F (4 °C) and 95 °F (35 °C). Protect from moisture. If damp, discard material
Solid Content
99 %
Penetration Depth
| Flash Point | 104°F (40°C) |
| Chloride penetration (NCHRP 244) | @125 sq.ft./gal |
| Series II – Absorbed chloride: 88% | |
| Series IV – Absorbed chloride: 98% |
Corrosion Data
Cracked Concrete Beam (ASTM G 109 modified)
20 Ponding cycles: 2 weeks with 3.0% sodium chloride solution and 2 weeks drying at 68°F.
After the 20th cycle, the concentration of the sodium chloride solution was increased to 5.0%
Application before cracking – Measurement after 2.5 years of ponding
| MacroCell Current in µA | Corrosion reduction | |
| Untreated | 81.9 | |
| Sika® FerroGard®-908 | 6.9 | 92% |
Application after cracking – Measurement after 2.5 years of ponding
| MacroCell Current in µA | Corrosion reduction | |
| Untreated | 81.9 | |
| Sika® FerroGard®-908 | 0.6 | 99% |
Application after cracking and after corrosion initiation – Measurement after 2.5 years of ponding
| MacroCell Current in µA | Corrosion reduction | |
| Untreated | 81.9 | |
| Sika® FerroGard®-908 | 10.0 | 87% |
US Bureau of Reclamation M-82
Standard Protocol to evaluate the performance of Corrosion Mitigation Techniques in Concrete Repairs
Figure 4 taken from the test report indicates “the corrosion rate in the treated slabs was significantly lowered. This can be seen by the slope of the curves in figure 4”
Chloride ion uptake reduction
Compared to untreated concrete, concrete treated with Sika® FerroGard®-908 shows a significantly reduced chloride uptake (test carried out using various methods).
Water penetration reduction
Test performed according to the European Standard EN 13057:2002 modified (100 mm sample size). Capillary absorption measurement were carried out after shaving 1, 5 and 7 mm of the concrete surface to assess the reduction of water absorption in the depth of the concrete surface.
Penetration depth
Sika® FerroGard®-908 is compared to a product available in the market on two types of concrete mixes (one concrete with water cement ratio of 0.70 and the second one with 0.45). The results show clearly a higher penetration of Sika® FerroGard®-908 into the test concrete when the same consumption was applied.
Application
Ambient Air Temperature
40–95 °F
Coverage
Required consumption is 125 sf / gallon. This is normally achieved with 2 coats (250 sf/gallon/coat); however 3 coats may be required for dense concrete and 1 coat may be achievable on porous concrete. Site mockups should be completed to verify.
APPLICATION
Apply using a low-pressure spray, brush or roller, in a single pass from the bottom up taking care not to let the product run. Apply subsequent coats wet on wet. Avoid ponding on the surface.
If used as a corrosion treatment prior to the application of Sikagard® and Sikalastic® protective coatings please contact Sika Technical Services for more information.
To ensure excellent bond, use of Sika® Concrete Repair Systems, sealants and coatings is strongly encouraged. Field mock ups are always recommended to verify final construction installation requirements.
Do not apply Sika® FerroGard®-908 to wet or damp substrates. Do not apply if rain is expected within four hours following application, or if high winds or other conditions prevent proper application.