Use

Sika CNI is recommended for conventional steel reinforcement as well as prestressed or posttensioned concrete that will be exposed to chlorides from marine environments or deicing salts. Sika CNI may also be used in concrete elements where chlorides are added initially to the concrete mix.

Characteristics and Advantages

In the high alkalinity of concrete, reinforcing steel builds up a natural passivation layer. This layer protects the steel from corrosion. This passive ferric oxide layer however can be damaged by the presence of chlorides and combined with the presence of moisture and oxygen which will lead to corrosion of the steel.
Sika CNI will help oxidize the steel to form ferric oxide, which resists chloride attack. This reduces the areas of ferrous oxide ions that are susceptible to attack by chlorides. Ferrous oxide creates a ferrous oxide complex (rust), if attacked by chlorides. In the presence of these chlorides, rust continues to generate in these areas (corrosion pits) and ultimately leads to staining, cracking and spalling of the concrete.
Sika CNI fortifies the ferric oxide passivating layer prior to the penetration of chlorides. The nitrite ions in Sika CNI will convert ferrous oxide to more resistant ferric oxide, thereby protecting the steel reinforcement from corroding.

Colour

Greenish liquid.

Packaging

208 litre (55 US gal.)/drum
1040 litre (275 US gal)/tote
and bulk delivery

Use

Sika FerroGard 901 is recommended for all steel reinforced concrete or repair mortars and grouts exposed to corrosive environments. Typical uses are:

• Concrete bridges, highways and pavements exposed to de-icing salts
• Concrete marine structures operating in chloride environments.
• Concrete tunnels, infrastructure or retaining walls.
• Concrete in industrial plants where corrosive substances are present.
• Concrete parking structures and decks.
• Concrete piers, piles, caissons and dock structures.

Sika FerroGard 901 specifically provides protection from chloride and carbonation induced corrosion.

Characteristics and Advantages

• Multifunctional inhibitor, active at both anodic and cathodic sites of a corrosion cell.
• High vapour pressure characteristic of inhibitor results in penetration through concrete.
• High affinity for steel enables displacement of chloride ions from metal surfaces.
• Forms a physical, high integrity and absorbed layer on the surface of embedded steel.
• Continuous barrier protects reinforcement from corrosion caused by loss of alkalinity.
• Creates an environment which restricts influence of moisture and oxygen in concrete.
• Material performance is supported by significant test data and track record.

Sika FerroGard 901 offers owners, specifiers, port authorities, transport ministries and engineers a proven technology in corrosion inhibition that is easily added to ready-mix or precast concrete and repair mortars or grouts. This dual action inhibitor dramatically delays the initiation of corrosion and greatly reduces ongoing corrosion activity.

Sika FerroGard 901:

• Extends the service life of concrete structures and reduces maintenance costs.
• Does not contain calcium nitrite; is non-hazardous and is environmentally friendly.
• Does not affect the rheological properties of plastic concrete; no changes in mix design or placement operations are required.
• Does not affect the properties of hardened concrete such as compressive and flexural strengths, permeability, etc.
• Reduces the harmful effects of steel corrosion which cause concrete cracking, staining, spalling and ultimate loss of structural integrity.
• Provides corrosion inhibition in the presence of chlorides, de-icing and marine salts.
• Enhances the durability of repair mortars and grouts in corrosive environments.

Colour

Green

Packaging

20 L (5.3 US gal.) pail