Product Overview

MC-Nafufill TP is the surface-filling and render mortar in the MC-Bauchemie Nafufill repair mortar family — positioned to address the large volume of surface defect repair work that every concrete construction project generates immediately after striking the formwork from columns, walls, beams, and slabs. In Indian high-rise and infrastructure construction, it is routine for 10 to 20 percent of the concrete surface area struck from formwork to require some degree of surface repair: honeycombs (typically 20 to 100 mm diameter, 5 to 30 mm deep, caused by inadequate vibration or aggregate segregation during concrete placement), tie rod holes (typically 20 to 25 mm diameter, through-holes from formwork tie system, require complete filling and surface restoration), blow holes (1 to 5 mm diameter surface pores from air entrapped at the formwork face, cosmetically unacceptable on fair-face concrete), and surface irregularities from formwork joint offsets (3 to 10 mm steps at form panel joints). MC-Nafufill TP addresses all these defect types in a single product: the polymer-modified formulation (based on redispersible polymer powder, RPP, factory-blended with Portland cement, graded fine sand, and cellulose ether workability retention agent) provides a smooth trowelable consistency (similar to a standard plaster or render mortar), excellent adhesion to the parent concrete substrate without a separate primer for defect depths up to 15 to 20 mm, and low drying shrinkage that prevents the repair from cracking and delaminating after application. The product is formulated to match the colour and texture of standard grey OPC concrete after curing, producing repairs that are visually undetectable on unpainted concrete surfaces — important for the growing market of architectural exposed concrete (beton brut) finishes in Indian premium residential and commercial buildings. Space Arc Engineering supplies MC-Nafufill TP for high-rise building concrete finishing, infrastructure bridge and viaduct element repair, and precast concrete post-production surface finishing in Ghaziabad, Noida, Delhi, and Uttar Pradesh.

Applications

• Honeycomb repair in concrete columns, walls, and beams immediately after formwork striking — repair of surface and near-surface honeycombs (20 to 100 mm diameter, 5 to 30 mm depth) in concrete columns, shear walls, retaining walls, and beams immediately after the formwork is struck on construction sites in Delhi NCR, Noida, Greater Noida, Gurgaon, and Ghaziabad; the procedure for honeycomb repair with MC-Nafufill TP starts with cutting and preparation of the defect perimeter to a clean, sound, regular edge (avoiding feathered edges) by chisel, disc cutter, or angle grinder to a minimum depth of 5 mm or to the full depth of the loose or honeycombed concrete, whichever is deeper; the prepared surface is cleaned of dust and loose material by compressed air and pre-wetted to a saturated surface dry (SSD) condition (no standing water on the surface at time of application); MC-Nafufill TP is mixed with clean water to the specified water-to-powder ratio (approximately 0.18 to 0.22 litres per kilogram — see PDS) to produce a stiff trowelable mortar, applied to the prepared defect in one or two layers up to 15 to 20 mm depth per layer, pressed firmly into the defect to eliminate voids behind the repair, struck off level with the surrounding concrete surface, and finished with a wetted steel or plastic trowel to the required surface texture; the repair must be moist-cured for minimum 3 days by wet hessian or polythene sheet curing to prevent early drying shrinkage cracking
• Tie rod hole filling and surface restoration in fair-face concrete construction — filling and surface restoration of through-formwork tie rod holes (typically 20 to 25 mm diameter, drilled or core-cut through the full concrete wall thickness at 600 to 900 mm grid spacing for through-bolt formwork tie systems) on fair-face exposed concrete columns, walls, and service core walls in premium residential buildings, office towers, hotels, and institutions in Delhi NCR where the architectural design calls for the concrete to remain visible without render or cladding; the tie rod holes are first filled from one face of the wall using a rod to compact the mortar to the centre of the wall thickness, then finished flush from both faces; MC-Nafufill TP polymer modification and controlled aggregate grading produce a filled surface that, when finished with a fine steel trowel to match the surrounding formwork face texture, is visually consistent with the parent concrete surface after one to two years of weathering and surface carbonation
• Blow hole filling and surface cosmetic improvement on architectural concrete facades — the treatment of the dense blow hole porosity typical of concrete cast against smooth steel or plastic-faced plywood formwork in humid Indian conditions, where dissolved air from the fresh concrete forms a layer of small surface pores (1 to 5 mm diameter, up to 3 mm deep) at the formwork-concrete interface; these blow holes are cosmetically unacceptable on architectural fair-face concrete facades, especially after painting or coating where the pores print through the coating surface; MC-Nafufill TP applied at 1 to 3 mm thickness as a slurry or stiff-consistency mortar rubbed into the blow hole field with a rubber float or trowel fills the individual blow holes and levels the overall surface porosity to produce a consistent, smooth finish suitable for coating or leaving as exposed fair-face concrete

Key Advantages

• Factory-blended polymer modification for consistent adhesion and low shrinkage without site-measured liquid polymer addition — the polymer modification in MC-Nafufill TP is factory-incorporated as a redispersible polymer powder (RPP), not added as a site-measured liquid latex, ensuring consistent polymer content and performance in every bag regardless of site conditions; the RPP re-disperses in water during mixing to form a polymer latex within the mortar matrix that bridges the interface between the repair mortar and the parent concrete, increasing bond strength (minimum 0.8 MPa pull-off per EN 1542 at 5 mm repair depth) and providing a flexible polymer network that reduces drying shrinkage by 15 to 25 percent versus unmodified cementitious mortar — the combination of high bond and low shrinkage is the reason polymer-modified mortars like MC-Nafufill TP are specified for thin-section concrete surface repair where unmodified mortars delaminate within weeks of application in the thermal and moisture cycling of Indian outdoor construction environments
• Colour-matched to standard grey concrete for visually undetectable repairs on unpainted concrete surfaces — MC-Nafufill TP is factory-formulated with Portland cement and carefully graded fine sand in proportions that produce a cured mortar colour close to that of standard Indian OPC 43 or OPC 53 grey concrete when applied at 5 to 20 mm depth; this makes the product suitable for surface repairs on exposed fair-face concrete structures (architectural concrete columns, bridge pier faces, concrete retaining walls) where the repair must not be visually distinguishable from the parent concrete after curing; for repairs on white cement or coloured concrete, consult MC-Bauchemie for the MC-Nafufill TP white or colour-matched version