Sika SikaTop 122 Plus
Two-component, polymer-modified structural repair mortar carrying an integral FerroGard 901 corrosion inhibitor, for trowel-applied concrete rehabilitation on horizontal, vertical and overhead surfaces.
What is it?
A two-part, polymer-modified, cement-based trowel mortar. A liquid acrylic polymer component is combined with a graded cementitious powder that carries Sika FerroGard 901, a penetrating corrosion inhibitor built into the mix.
Where is it used?
Structural repair of parking decks, bridges, tunnels, dams, ramps, industrial floors and building frames where spalled or carbonated concrete and corroding reinforcement need reinstating.
Why use it?
It combines high strength, very low shrinkage and a corrosion inhibitor in one product, so the patch resists cracking, bonds tightly and helps slow further rebar corrosion in the surrounding concrete.
How is it applied?
Mixed with a slow-speed drill for up to three minutes, scrubbed into a saturated-surface-dry substrate to fill pores, then built up in lifts and finished by trowel.
About Sika SikaTop 122 Plus
SikaTop 122 Plus is Sika’s workhorse structural repair mortar for engineers who need a patch that behaves like the concrete around it. It arrives as two parts: a liquid acrylic polymer emulsion and a factory-blended powder of Portland cement, graded aggregates and Sika FerroGard 901. Blended on site, they produce a grey, trowel-grade mortar that scrubs into the substrate, holds on vertical faces and stays put overhead without slumping. The plant-proportioned kit removes site guesswork on dosage, which is why specifiers reach for it on parking structures, bridges, dams, tunnels and industrial plants where consistency and durability are non-negotiable.
What sets this product apart from a plain sand-cement patch is the corrosion inhibitor carried inside the mix. On carbonated or chloride-contaminated concrete, the usual failure mode is a repair that looks sound but does nothing to protect the steel behind it, so corrosion simply restarts at the edge of the patch. FerroGard 901 penetrates into the adjacent concrete and slows that reaction, extending the life of the repair beyond the patched zone. Add extremely low shrinkage, high 28-day strengths and a thermal expansion coefficient matched to concrete, and you get a mortar that stays bonded through temperature cycles rather than debonding as a hard, brittle plug. Space Arc Engineering supplies and applies SikaTop 122 Plus on projects across Delhi NCR and Pan-India as an authorised Sika channel.
The technical insight
The engineering logic behind SikaTop 122 Plus is compatibility rather than raw strength alone. Ordinary repair mortars often fail at the interface: they shrink as they cure, pulling away from the parent concrete, and their coefficient of thermal expansion differs enough that daily heating and cooling shears the bond over time. Sika addresses both. The acrylic polymer emulsion reduces the water demand and refines the pore structure, which cuts drying shrinkage to well under 0.05 percent and lifts density so the mortar resists carbonation and chloride ingress. The product also passes ASTM C-884 thermal-compatibility testing, meaning it expands and contracts close enough to the substrate that the repair moves as one body. The second mechanism is electrochemical. Even a perfectly bonded patch can trigger incipient-anode (“ring anode”) corrosion, where newly passivated steel in the patch drives corrosion in the still-contaminated concrete just outside it. FerroGard 901 migrates into that surrounding zone and suppresses the anodic reaction, so the repair does not simply push the corrosion front a few centimetres down the bar. The result is a durable, monolithic, self-protecting patch.
Where it is used
- Structural repair of reinforced concrete in multi-storey and basement car parks, including deck soffits and beams
- Reinstatement of spalled or carbonated concrete on bridge piers, abutments, decks and parapets
- Patch repair and reprofiling of columns, beams and slabs in industrial plants and process buildings
- Vertical and overhead repairs where the mortar must hold without formwork
- Rehabilitation of chloride- and carbonation-damaged concrete on marine and coastal structures above the tidal zone
- Repair of tunnels, dams, ramps and retaining walls exposed to aggressive service conditions
- Levelling and reprofiling of concrete surfaces prior to protective coating or membrane systems
- Overlay and resurfacing of worn concrete toppings subject to abrasion and de-icing salts
Key advantages
- Extremely low shrinkage, confirmed by four separate industry test methods, so patches resist cracking and stay bonded
- Integral FerroGard 901 corrosion inhibitor that protects steel in the repair and in the surrounding concrete
- High 28-day compressive strength of about 48 MPa and flexural strength above 10 MPa for genuine structural performance
- Coefficient of thermal expansion matched to concrete, passing ASTM C-884, for long-term interface stability
- Thixotropic, trowel-grade consistency that holds on vertical and overhead surfaces without formwork
- Increased density improves resistance to carbon dioxide (carbonation) and chloride ingress without becoming a vapour barrier
- Plant-proportioned two-component kit removes on-site dosing errors and gives repeatable results
- Certifiable for food-industry environments and compliant with ANSI/NSF 61 for potable-water contact
Limitations & considerations
- Corrosion inhibitor reduces, but does not eliminate, corrosion risk; heavily chloride-contaminated steel still needs proper cleaning and, where specified, an anti-corrosion primer such as Sika Armatec 110 EpoCem
- Application and substrate temperatures matter; work is sensitive to heat, cold, wind and sun, and ACI 306 guidance applies in extreme conditions
- Layer thickness is limited per lift (roughly 3 to 25 mm neat), so deep or large-volume repairs must be built up in passes or extended with aggregate
- Substrate must be sound and saturated-surface-dry with no standing water; poor preparation is the most common cause of repair failure
- Solvent-based curing compounds must not be used, and contact with aluminium should be avoided to prevent an adverse reaction
- It is a repair mortar, not a standalone waterproofing system; active leaks and full protection require complementary products
Selection & best practice
Preparation decides the outcome. Break out all deteriorated concrete back to sound material, saw-cut and undercut the repair edges to avoid feather-edging, and expose an aggregate profile by mechanical means. Clean reinforcement to bright metal; where chlorides are present, high-pressure wash after mechanical cleaning and prime the steel with Sika Armatec 110 EpoCem. Bring the substrate to a saturated-surface-dry condition with no free water. Mix by adding the powder to most of the liquid under a slow-speed drill, blend to a uniform consistency within about three minutes, and adjust with the remaining liquid if needed. Scrub the first pass firmly into the pores to fill every void, then build up in lifts within the stated thickness range, working from the edges toward the centre before consolidating and screeding. Cure properly and avoid solvent-based curing compounds. On tall lifts or in hot or cold weather, follow ACI 306 and keep thin sections shaded from direct sun.
Specifications
| Product type | Two-component, polymer-modified, cementitious trowel-grade repair mortar with corrosion inhibitor |
| Compressive strength (28 days) | Approx. 48 MPa (7,000 psi), ASTM C-109 |
| Flexural strength (28 days) | Approx. 10.3 MPa (1,500 psi), ASTM C-293 |
| Tensile strength (28 days) | Approx. 13.8 MPa (2,000 psi), modified ASTM C-882 |
| Pull-out resistance (28 days) | Approx. 2.8 MPa (400 psi), ASTM C-1583 |
| Drying shrinkage (28 days) | Below 0.05% (ASTM C-157, modified per ICRI 320.3R) |
| Layer thickness (neat) | 3.2 mm minimum to 25 mm maximum per lift |
| Set time | Approx. 35–70 minutes initial (ASTM C-266), temperature dependent |
| Corrosion inhibitor | Integral Sika FerroGard 901 penetrating corrosion inhibitor |
Industry use cases
Car Parks & Podiums
Reinstating spalled deck soffits, beams and columns where chloride- and carbonation-driven corrosion has cracked the cover concrete, with the inhibitor slowing further steel loss around the patch.
Bridges & Highway Structures
Structural repair of piers, abutments and parapets exposed to de-icing salts and freeze-thaw cycling, where matched thermal movement and low shrinkage keep the repair bonded.
Marine & Coastal
Rehabilitating jetty beams, sea-facing frames and splash-zone concrete above the tidal line, using the increased density to resist ongoing chloride ingress.
Industrial & Process Plants
Patching floors, plinths and support structures in plants and, where hygiene matters, food-industry areas thanks to the product’s food-contact certifiability.
Water-Retaining Structures
Reprofiling tank walls, dams and treatment structures, with ANSI/NSF 61 compliance supporting use on potable-water-contact surfaces.
Frequently asked questions
What is the difference between SikaTop 122 Plus and a normal sand-cement repair mortar?
How thick can I apply SikaTop 122 Plus in one pass?
Do I still need a separate corrosion primer on the reinforcement?
Can it be used on vertical and overhead surfaces without formwork?
What pack size does Space Arc supply in India?
Is SikaTop 122 Plus suitable for water tanks and food-industry areas?
How we position Sika SikaTop 122 Plus
SikaTop 122 Plus sits at the structural, corrosion-inhibited end of Sika’s concrete repair range. Where you only need to prime steel before patching, pair it with Sika Armatec 110 EpoCem; for the epoxy bonding and anchoring detailing called out on many repairs, Sikadur 32 is the natural companion, and Sika reprofiling and protective anti-carbonation coatings complete the system. For engineers who standardise on Fosroc, the closest equivalent is Renderoc HS, a high-strength structural repair mortar normally specified alongside a Fosroc anti-corrosion primer such as Nitoprime Zincrich; Renderoc HB is the lighter, high-build option for thicker vertical and overhead reprofiling where structural strength is less critical. Space Arc supplies both the Sika and Fosroc systems, so the choice can follow the project specification rather than what happens to be on the shelf.
Fosroc Renderoc HS — Choose Renderoc HS when the project is standardised on a Fosroc repair system and you can add a dedicated anti-corrosion primer such as Nitoprime Zincrich separately, rather than relying on an inhibitor built into the mortar.
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