Product Overview

MC-RocTec 45 is a factory-blended, fine-grain, polymer-modified cementitious repair mortar from MC-Bauchemie with a maximum aggregate size calibrated for smooth application at 5 to 15 mm depth — positioned in the MC-Bauchemie structural repair mortar range as the precision fine-grain option between surface skim-coat mortars (0 to 5 mm) and the medium-aggregate MC-Dur 200 (5 to 20 mm). The product combines Portland cement, graded fine silica aggregate (maximum grain size approximately 1 to 1.5 mm), and polymer redispersible powders to produce a mortar that, after gauging with water on site, has a workable consistency suitable for hand application, float finishing, and sprayed application. The polymer modification provides three functions: increased adhesion to the prepared concrete substrate relative to plain cementitious mortars; improved flexibility (lower elastic modulus) compared with rigid cementitious mortars, reducing the risk of shrinkage cracking and thermal stress delamination in shallow repairs where restraint forces from the substrate are high relative to the mortar section thickness; and improved surface durability and resistance to surface abrasion and freeze-thaw cycling. The fine aggregate grading (maximum 1 to 1.5 mm) allows MC-RocTec 45 to produce a smooth surface finish when float-applied, making it suitable for visible architectural concrete faces, beam soffit repairs in car parks and residential buildings where surface appearance is important, and column face repairs where the repair must match the surrounding concrete texture. The mortar complies with EN 1504-3 as a repair mortar meeting the structural repair class requirements for compressive strength and adhesion, providing specification confidence for structural engineers and architects specifying repair of concrete structures in India. Space Arc Engineering supplies MC-RocTec 45 for structural repair contractors, builders, and maintenance engineers across Ghaziabad, Delhi NCR, Noida, and Uttar Pradesh.

Applications

• Shallow beam soffit and web repair — application of MC-RocTec 45 in 5 to 15 mm depth to repair beam soffits in residential and commercial buildings where carbonation-induced corrosion has caused cover spalling and rust staining, and where the required repair depth after concrete removal and rebar treatment is less than 15 mm — the fine aggregate of MC-RocTec 45 produces a surface texture compatible with the original formed beam face, allowing a cosmetically acceptable repair finish that can be painted without surface grinding
• Column face repair at shallow depth — restoring the full cross-sectional geometry of reinforced concrete columns in buildings and car parks where fire damage, impact damage, or corrosion-induced spalling has removed 5 to 15 mm of the column face — a repair where MC-Dur 200 aggregate (maximum 3 mm) may produce a slightly coarser surface texture than acceptable, and where MC-RocTec 45 fine grain achieves the smooth column face appearance required by the building occupants and the structural engineer
• Wall surface repair in industrial and infrastructure structures — repairing impact damage, tie-bolt pockets, and corrosion-induced deterioration of reinforced concrete walls in water treatment plants, tunnels, underground car parks, and infrastructure structures where the repair depth is 5 to 15 mm and where the smooth surface finish of MC-RocTec 45 simplifies subsequent application of protective coatings or waterproofing systems
• Slab soffit repair — restoring the underside of concrete slabs in multi-storey car parks, podium decks, and building structures where delamination of the bottom cover layer has exposed the slab soffit to 5 to 15 mm depth — the fine grain of MC-RocTec 45 allows proper compaction in the overhead slab soffit repair position without the segregation and drop-out risk associated with coarser aggregate mortars
• Precast concrete repair and remediation — repairing surface defects in precast concrete panels, columns, beams, and bridge beams at the precast plant or on site where the precast element has surface honeycombing, form-joint defects, or minor mechanical damage at 5 to 15 mm depth that must be repaired to achieve the specified surface quality grade before delivery to site or installation

Key Advantages

• Fine grain for smooth surface finish — maximum aggregate size of approximately 1 to 1.5 mm produces a trowel-finished surface with a texture comparable to fair-faced formed concrete — suitable for visible architectural concrete repairs, painted surfaces, and coating-applied surfaces without surface grinding or skim-coat application over the repair mortar
• Single application at 5 to 15 mm depth — factory blending ensures consistent particle grading and polymer content that allows clean, single-pass application from 5 to 15 mm without the slumping and aggregate segregation of hand-mixed site mortars — eliminating the need for multiple thin coats to achieve 10 to 15 mm repair depth
• Polymer modification for improved adhesion and reduced shrinkage — the polymer dispersion content increases adhesion to concrete substrates compared with plain cementitious mortars (adhesion greater than 1.0 MPa in pull-off test per EN 1542) and reduces drying shrinkage, which is the primary cause of edge debonding and surface cracking in shallow concrete repairs where restraint from the surrounding slab or beam concrete is high relative to the mortar section
• Applicable by hand trowel or spray — the fine aggregate and polymer modification allow application either by hand trowel/float for normal site conditions or by mortar spray equipment for large-area applications — the spray option significantly increases application speed for wall and slab soffit repairs in infrastructure structures
• EN 1504-3 compliant — meets the structural repair mortar performance requirements of EN 1504-3 for compressive strength, adhesion, and resistance to carbonation — ensuring specification compliance for repair of structures specified under EN 1504 principles, increasingly common in NHAI bridge maintenance specifications and major building contracts in India