About MC-Bauchemie MC-Nafufill TP

MC-Nafufill TP sits in that awkward middle ground of concrete repair that engineers know well: the section is sound and needs no structural reinstatement, but the face is peppered with blowholes, tie-rod holes and shallow honeycombing that look poor and invite water ingress. Rather than skim these over with site-batched cement slurry — which shrinks, dusts and rarely colour-matches — MC-Bauchemie supplies this as a pre-formulated trowel mortar. The dry blend pairs Portland cement and graded fine sand with a redispersible polymer powder and a cellulose-ether water-retention agent, so every bag carries the same polymer loading regardless of who mixes it or what the weather is doing on site.

The polymer is the point of difference. It knits the mortar to the parent concrete and holds water in the mix long enough for the cement to hydrate properly, which is exactly what a thin 1-20 mm layer needs to avoid the map-cracking that plagues neat cement fills. Because the shade is tuned to standard Indian OPC 43 and OPC 53 grey concrete, a well-executed repair effectively disappears on unpainted surfaces — a genuine advantage on architectural fair-face work where the client is paying for the concrete to be seen. Space Arc Engineering supplies MC-Nafufill TP as an authorised MC-Bauchemie project distributor across Delhi NCR, Uttar Pradesh and Pan-India, with technical back-up for method statements and site trials.

The technical insight

The mortar works because of how the redispersible polymer powder (RPP) behaves once water is added. On mixing, the RPP re-forms into a polymer film that wraps the cement grains and fine aggregate; as the mortar stiffens, that film bridges the interface with the old concrete and reduces the internal stresses that cause a thin layer to peel or curl. The cellulose ether does the quieter but equally important job — it holds mixing water in the mortar so that a 1-2 mm feathered zone does not flash-dry against absorbent concrete and lose the water it needs to cure. Together they cut drying shrinkage by roughly 15-25% versus an unmodified equivalent, which is why the material can be feathered down to closed surfaces and still develop a reported minimum 0.8 MPa pull-off bond at 5 mm depth (EN 1542) and around 25 MPa compressive strength at 28 days. The trade-off is deliberate: this is a surface and fine-filling mortar, not a high-build structural patch, so the chemistry is optimised for adhesion, finish and low shrinkage rather than for rebuilding heavy section.

Where it is used

• Filling blowholes and surface pores (roughly 1-5 mm diameter) on stripped concrete faces
• Making good form-tie and tie-rod holes after shutter removal
• Repairing shallow honeycombing pockets, typically 20-100 mm across and 5-30 mm deep
• Fairing and skimming fair-face and architectural concrete before it is left exposed or coated
• Treating and dressing cold joints and construction-joint lines
• Surface preparation and levelling ahead of protective or decorative coating systems
• Cosmetic reinstatement of precast panels and cast-in-situ elements on water-retaining structures

Key advantages

• Single-component — needs only clean water on site, removing the guesswork of site-gauged polymer additions
• Factory-controlled polymer content means consistent bond and finish from bag to bag
• Colour tuned to Indian OPC 43/OPC 53 grey concrete, so repairs blend in on unpainted fair-face work
• Reduced drying shrinkage (about 15-25% versus unmodified mortar) lowers the risk of map-cracking in thin layers
• Wide 1-20 mm per-layer working range covers everything from blowhole blinding to shallow honeycomb filling
• Good trowel and float workability with a practical 30-45 minute pot life at 25 degrees C
• Strong pull-off bond to sound, prepared concrete for a durable, well-keyed repair

Limitations & considerations

• Not a structural or high-build repair mortar — it will not rebuild lost section or carry load, so deep or reinforcement-level repairs need a dedicated repair mortar
• Maximum 1-20 mm per pass; greater depths must be built up in layers with adequate keying between them
• Feathered edges are weak — perimeters should be cut back to a clean, squared arris rather than tapered to nothing
• Substrate must be brought to saturated-surface-dry (SSD); over-wet or dry-and-dusty faces compromise the bond
• Pot life is limited (about 30-45 minutes at 25 degrees C) and shortens in hot weather, so mix only what can be placed in time
• Needs a minimum 3-day moist cure to develop strength and avoid shrinkage cracking, which demands site discipline

Selection & best practice

Specifications

Industry use cases

How we position MC-Bauchemie MC-Nafufill TP

MC-Nafufill TP is the fair-face finishing and fine-filling member of MC-Bauchemie’s Nafufill concrete-repair family. Where the defect is deeper than cosmetic — spalled cover, corroded reinforcement, lost section — specify a structural Nafufill repair mortar such as the Nafufill KM 250 hand/spray-applied range for the body of the repair, then use MC-Nafufill TP as the closing fairing coat over it. Pair it with an MC-Bauchemie Zentrifix or MC-DUR protective or decorative coating where the finished concrete is to be sealed. For clients standardised on other brands we stock, the equivalent fairing role is filled by Fosroc’s Renderoc system (below); Space Arc can advise on the right combination for the exposure and finish the project demands.

Related Concrete Repair products

View all Concrete Repair products →