Sika® FerroGard®-903 Plus

BRE, The use of surface applied Sika® FerroGard® 903 corrosion inhibitor to delay the onset of chloride induced corrosion in hardened concrete, BRE Client Report No. 224-346, 2005
Mott MacDonald, Evaluation of Sika® FerroGard® 901 and 903 Corrosion Inhibitors, Ref. 26’063/001 Rev A, April 1996.
SAMARIS (Sustainable and Advanced Materials for Road Infrastructure) - Final Report, Deliverables D17a, D17b, D21 & D25a, Copenhagen, 2006
Mulheron, M., Nwaubani, S.O. , Corrosion Inhibitors for High Performance Reinforced Concrete Structures, University of Surrey, 1999
C-Probe Systems Ltd., Performance of Corrosion Inhibitors in Practice, 2000

Aqueous solution of amino alcohols & salts of amino alcohols

24 months from date of production if stored properly in undamaged and unopened, original sealed packaging

Store in a cool environment. In case of - frost (< -5 °C), - reversible crystallisation may occur. If this happens, let the product warm up at room temperature (+15 to +25 °C), then stir well to re-dissolve the crystals.

~1.05 (at +20 °C)

~10

~20 mPa·s (Brookfield RVT, spindle 2, 100 rpm, 23 °C)

Sika® FerroGard®-903 Plus is part of the Sika® Concrete Repair & Protection Systems: 

Site surveys and experimental tests have shown that Sika® FerroGard®-903 Plus can penetrate through concrete at a rate of a few millimetres per day and to a depth of approximately 25 to 40 mm in 1 to 2 months. This penetration rate can be faster or slower dependent on the porosity of the concrete. Sika® FerroGard®-903 Plus penetrates through both liquid and vapour phase diffusion mechanisms.
Note: If after application of Sika® FerroGard®-903 Plus, the concrete surface is coated with protective coatings (cement based, acrylic or impregnation) or hydrophobic impregnation, the rate of diffusion of the inhibitor is reduced but not stopped as the mechanism of diffusion liaises then only on the vapour phase.
As concrete quality and permeability differ, it is recommended to perform some preliminary depth profile testing by the Sika “Qualitative Analysis” to assess the specific penetration rate.

+5 °C min. / +40 °C max.

+5 °C min. / +40 °C max.

Generally ~0.50 kg/m² (~480 ml/m²).
For very dense concrete with low permeability, the rate of application of Sika® FerroGard®-903 Plus can be reduced but must not be lower than 0.300 kg/m² (290 ml/m²).
To assess project requirements, consumption and depth of penetration shall be checked on site using the Sika “Qualitative Analysis” – refer to the relevant method statement.

Sika® FerroGard®-903 Plus is supplied ready for use and must not be diluted. Do not shake the material prior to use.

Sika® FerroGard®-903 Plus shall be applied to saturation by brush, roller, low pressure or airless spray equipment.
After the application of the last coat, as soon as the surface become mat, do a low pressure water cleaning (water hose).
The day after application, the treated surfaces shall be cleaned by pressure washing (~ 10 MPa – 100 bars) to remove any traces of soluble salts that may have deposit at the surface.

Number of coats:

This is dependent on the porosity and moisture content of the substrate and the weather conditions.
Vertical surfaces: Normally, 2 to 3 coats are necessary to achieve the required consumption. In case of dense concrete, additional coats may be required.
Horizontal Surfaces: Saturate surface by 1-2 coats, take care to avoid ponding.
Waiting time between coats: This is dependent on the porosity of the concrete and the weather conditions, normally 1-6 hours. Allow the surface to dry out between coats to a matt damp appearance.

 
OVERCOATING:
If the application is carried out as described above, no further treatment is required before over-coating with Sikagard^® hydrophobic impregnations, Sikagard^® breathable coatings or Sikafloor^® products (Refer to appropriate Product Data Sheet for application details)
If non Sika coatings are to be applied, please contact the manufacturers technical department for confirmation of compatibility with Sika® FerroGard®-903 Plus or undertake compatibility and adhesion site trials.
When Sika® FerroGard®-903 Plus is used within a patch repair or before a cementitious overlay, Sika repair or overlay system can be used. Standard preparation (pre-wetting) shall be applied.
When using a smoothing coat/pore filler over surface treated with Sika® FerroGard®-903 Plus, products such as SikaTop^®-121, Sikagard^®-720 EpoCem^®, Sika MonoTop^®-107, SikaTop^®-Seal 107, Sika MonoTop^®-723 N, etc. can be used. Cementitious levelling mortars shall only be used if there is a well prepared open textured surface that is completely cleaned of residue.
If other Sika cement based products are to be used, site trials are recommended to confirm preparation and suitability.
If non Sika cement based products are to be used, please contact the manufacturer technical department for confirmation of compatibility with Sika® FerroGard®-903 Plus or undertake compatibility and adhesion site trials.

Use water to clean application equipment