MC-Bauchemie Centricrete UF
MC-Bauchemie’s ultra-fine, two-component cement suspension for pressure-injecting hairline cracks, joints and voids that a standard OPC grout is too coarse to enter.
What is it?
A two-component, ultra-fine (microfine) Portland cement suspension grout — a binder powder plus a liquid additive, mixed with water in a colloidal mixer and pumped at low pressure through packers into cracks, joints and voids.
Where is it used?
Structural and shrinkage cracks, construction/cold joints and honeycombed concrete in basements, retaining walls, water-retaining structures (UGWTs, STPs, ESRs), tunnel linings and load-bearing masonry — under dry, damp or actively water-bearing conditions.
Why use it?
Being cement rather than resin, it restores alkalinity around reinforcement and bonds mineralogically with the host concrete, cures without shrinkage or expansion, and is EPD-certified — while its sub-10-micron grading reaches cracks a coarser grout would only bridge over.
How is it applied?
Water and Centricrete UF Additiv are stirred together first, the binder is added while stirring, and the suspension is mixed for a full 10 minutes in a colloidal mixer; flow is checked with a Marsh funnel, then the mix is pumped through packers with a low-pressure injection pump within the roughly 60-minute working time.
About MC-Bauchemie Centricrete UF
Centricrete UF belongs to MC-Bauchemie’s mineral-based injection range, alongside the single-component Centricrete HCS, and is built on an idea that’s simple to state but not trivial to manufacture: grind Portland cement fine enough to inject like a resin while still curing like concrete. Its technical datasheet lists a particle grading under 10 microns by laser granulometry and a milling fineness of roughly 16,000 cm²/g — for comparison, ordinary IS-grade OPC typically runs 2,250-3,200 cm²/g Blaine, so this is five to seven times finer. That fineness is what lets a cement grout, rather than an epoxy or polyurethane resin, get into cracks and micro-voids a normal grout would simply sit on top of. The system ships as two components — a 25.03 kg bucket of binder and a 2.35 kg canister of liquid additive — mixed with about 13.5-14 litres of water per bag in a colloidal mixer, always as complete containers.
For basements, retaining walls, underground water tanks, STPs and metro/tunnel linings across Delhi NCR and pan-India sites, the practical case is direct: shrinkage or structural cracks and construction-joint seepage need sealing before, or sometimes instead of, a waterproofing membrane going on. Centricrete UF is rated for dry, damp and actively water-bearing conditions, cures with only about 2% dimensional change so it’s less likely to debond from the crack it fills, and its published strength gain — roughly 26 N/mm² at 24 hours rising to about 42 N/mm² at 28 days — shows it restoring real structural continuity, not just plugging a leak path. It is a rigid-fill system, though, and not a substitute for flexible resin injection where a crack is still expected to move.
The technical insight
The number worth sitting with is the fineness: about 16,000 cm²/g against conventional OPC’s 2,250-3,200 cm²/g. That’s what gives it a Marsh-funnel flow time of 50-55 seconds — closer to a low-viscosity resin than a typical grout — letting it be pumped through 12 mm packers into cracks a non-shrink grout would never reach. Its E-modulus of roughly 20,400 N/mm² sits close to typical M25-M30 concrete stiffness, so the filled crack doesn’t become a hard, brittle inclusion inside a softer matrix, a common failure mode with mismatched repair materials. One flag for specifiers: the strength, fineness and density data on the sheet are referenced to EN 196-1, EN 196-6 and EN ISO 3675, not IS 4031/IS 269, and sulphate resistance is validated by the German SVA method rather than an IS test — worth raising with MC-Bauchemie’s India technical team before tender if a specification insists on IS-referenced certificates.
Where it is used
- Rigid filling of structural and shrinkage cracks in RCC beams, columns, slabs and walls
- Sealing and reinforcing construction/cold joints in water-retaining structures — UGWTs, STPs, ESRs
- Consolidation grouting of voids and honeycombed concrete behind formwork
- Crack injection in tunnel and metro linings under water-bearing conditions
- Re-bonding and stabilising cracked or rubble masonry in load-bearing and heritage walls
- Sealing basement and retaining-wall cracks ahead of membrane waterproofing
- Repairing cracks and voids in precast box culverts, panels and segments
- Crack sealing in canal linings, dam faces and other hydraulic structures
Key advantages
- Sub-10-micron grading penetrates hairline cracks a standard OPC-based grout is too coarse to enter
- Mineral chemistry restores alkalinity around reinforcement rather than just bridging the gap
- Cures with only about 2% dimensional change (EN 445), lowering debonding risk
- Sulphate-resistant per the SVA method — relevant for below-ground and aggressive-soil work
- Injectable under dry, damp and actively water-bearing conditions, not dry cracks only
- About 60 minutes’ working time gives crews a realistic pumping window per batch
- EPD-certified, useful for green-building documentation
- Strength gain to ~42 N/mm² at 28 days shows genuine structural contribution, not just sealing
Limitations & considerations
- Rigid grout — unsuitable for live/moving cracks, which need a flexible PU or resin system instead
- Requires a colloidal mixer and a proper low-pressure pump (MC-I 910) with packers; not a hand-mix product
- Application stops below 5°C component/substrate temperature, relevant for winter and hill-site work
- Data sheet is referenced to EN standards, not IS 4031/IS 269 — confirm early if a spec demands IS certificates
- Fixed component sizes (25.03 kg binder + 2.35 kg additive) set a minimum practical batch, so tiny patch jobs carry some wastage
- Performance depends on correct 10-minute mixing and precise water dosing — under-mixing shows up in flow time and, later, strength
Selection & best practice
Run a trial injection before committing to the full crack network, as the datasheet recommends — it’s the only reliable way to fix packer spacing and pressure for that crack’s width and depth. Mix in the stated order: water and Additiv first, then the binder added slowly with continued rapid stirring for the full 10 minutes; check the Marsh funnel flow time (target 50-55 seconds) before every batch goes to the pump, since under-mixing shows up there first. Keep substrate and component temperature above 5°C, use each batch within its ~60-minute working time, and clean tools with water before anything sets. On actively water-bearing cracks, arrest or reduce flow first so the slurry can gel in place rather than get washed out.
Specifications
| System / chemistry | Two-component ultra-fine (microfine) Portland cement suspension — binder powder + liquid additive |
| Grain size distribution | < 10 μm (laser granulometry) |
| Fineness (grinding/milling) | approx. 16,000 cm²/g (EN 196-6) |
| Mixing ratio (Binder : Additiv : Water) | 25.03 : 2.35 : 13.5–14, by mass |
| Density of mixed slurry | 1.65–1.75 kg/dm³ (EN ISO 3675) |
| Working time | approx. 60 minutes |
| Compressive strength (24h → 28d) | approx. 26 → 42 N/mm² (EN 196-1) |
| Flow time / injectability | 50–55 sec, Marsh funnel 4.76 mm (EN 14117) |
| Pack sizes / shelf life | Binder 25.03 kg bucket + Additiv 2.35 kg canister; 12 months (5–30°C, dry, sealed) |
Industry use cases
Water & wastewater infrastructure
Sealing construction-joint leakage and structural cracks in an underground water tank or STP wall under active water pressure.
Residential & commercial basements
Rigid filling of settlement or shrinkage cracks in a basement retaining wall before the waterproofing membrane goes on.
Tunnelling & metro infrastructure
Crack injection in tunnel lining segments showing seepage at joints.
Heritage & masonry structures
Consolidation grouting of loose rubble masonry walls to restore monolithic load-bearing action.
Precast & industrial concrete
Sealing cracks and voids in precast box culverts or wall panels before handover.
Frequently asked questions
Is Centricrete UF the same as epoxy crack injection?
Can it be injected into a crack that’s actively leaking water?
What equipment does the applicator need?
How fine a crack can it actually fill?
What’s the working time after mixing?
Does temperature affect the job?
How we position MC-Bauchemie Centricrete UF
Within MC-Bauchemie’s own line-up, Centricrete UF sits next to Centricrete HCS, a single-component, chloride-free version of the same rigid-fill idea that’s simpler to batch on sites where two-component dosing is harder to control. For cracks still expected to move, or for reaching truly hairline widths, MC-Bauchemie’s resin-based (MC-Injekt) systems are the right chemistry instead — Centricrete UF is deliberately the rigid, mineral option, not a universal injection product. On the Fosroc side, Space Arc’s catalogue doesn’t carry a genuine equivalent: Fosroc’s Conbextra range (GP1/GP2/GP3, EPX) is built for free-flow grouting under baseplates and machine foundations, a different job from pressure-injecting a fine structural crack, so it isn’t treated as a like-for-like substitute here.
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