About MC-Bauchemie MC-Nafuplan HD

MC-Nafuplan HD is MC-Bauchemie’s answer to a problem every rehabilitation contractor knows well: when the damaged area runs into tens or hundreds of square metres, trowelling mortar by hand stops being practical. It arrives as a single-component dry powder in 25 kg bags, blended at the factory with polymers and a coarse aggregate grading so that on site you add only water, feed it through a mortar pump, and spray it onto the wall or soffit. The polymer content is what lets it grip vertical and overhead surfaces in builds up to 40 mm without slumping, while the coarse aggregate keeps shrinkage and material cost in check on thick sections.

For Space Arc’s clients across Delhi NCR and the wider country, the appeal is throughput. A trained spray crew can reinstate 100 to 300 m2 of vertical or overhead concrete in a working day, which changes the economics of jobs like a bridge soffit or a tunnel invert entirely. The mortar is classified under EN 1504-3 as an R3/R4 structural repair material and aligns with IS 456 guidance on overlay repair, so it carries the paperwork that consultants and infrastructure owners ask for before a repair is signed off. It is a specifier’s product first, chosen when the scale of the deterioration rules out patch-and-fill.

The technical insight

The performance comes from three things working together. First, the polymer modification: dispersed polymer in the matrix improves the mortar’s tensile and flexural behaviour and, critically, its adhesion, delivering a pull-off bond above 1.5 MPa (EN 1542) so the repair acts monolithically with the parent concrete rather than as a bolted-on skin. Second, the coarse-aggregate grading: unlike fine skim mortars, the larger particle range lets each spray pass build 10-40 mm of sound material while restraining drying shrinkage and holding rebound below 15 percent by mass on vertical faces, so more of the bag ends up on the structure and less on the floor. Third, the sprayed placement itself compacts the mortar against the substrate as it hits, driving out voids and producing a dense matrix that reaches over 35 MPa compressive strength at 28 days. Together these give a repair layer that resists cracking better than an unmodified mortar and bonds well enough to carry structural load.

Where it is used

• Reinstating spalled and delaminated concrete on bridge soffits and decks
• Restoring tunnel invert, wall and lining sections over large areas
• Rehabilitating soffits and slabs in multi-storey and podium car parks
• Resurfacing retaining walls, abutments and slope-protection concrete
• Section rebuilding on industrial structures, silos and process buildings
• Resurfacing and making good precast panels and large façade elements
• High-volume repair of chloride- and carbonation-damaged infrastructure
• Overhead and vertical repairs where formwork-and-pour is impractical

Key advantages

• Machine spray application reinstates 100-300 m2 per day, far outpacing hand trowelling
• Builds 10-40 mm per pass on vertical and overhead surfaces without sagging
• Low rebound (under 15 percent) keeps waste and clean-up down on site
• Strong pull-off bond above 1.5 MPa for a monolithic, load-carrying repair
• EN 1504-3 R3/R4 classification satisfies consultant and owner specifications
• Single-component powder, water-only on site, so mixing errors are minimal
• Coarse aggregate controls shrinkage and cost on thick, large-volume sections
• Small patches can still be hand-applied, so one product covers the whole job

Limitations & considerations

• Wet spraying needs a suitable mortar pump and a trained nozzle operator, not general labour
• Rebound and finish depend heavily on operator technique and correct substrate saturation
• Coarse aggregate makes it unsuitable for thin skim coats or fine cosmetic finishing
• Substrate must be sound, cleaned to exposed aggregate and any corroded steel treated first
• Like all cementitious repairs, it needs proper curing to develop strength and resist shrinkage cracking
• Not a standalone waterproofing layer; water-retaining or buried structures need a separate protective or waterproofing system

Selection & best practice

Specifications

Industry use cases

How we position MC-Bauchemie MC-Nafuplan HD

MC-Nafuplan HD sits at the large-area, machine-sprayed end of the concrete repair range. For smaller hand-applied patches on the same project, MC-Bauchemie’s Nafufill KM 250 and the finer Nafufill GSE from the same family are the natural companions, and a compatible MC anti-corrosion primer should be used on exposed reinforcement. Where a job needs full waterproofing after repair, pair it with a suitable system from our waterproofing range. Within the Fosroc lines Space Arc supplies, Renderoc SP30 is the closest equivalent, and the Renderoc hand-applied mortars cover the patch repairs; buyers standardised on one brand can specify a single family end to end, while others mix brands to suit availability and consultant preference.

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