Product Overview

MC-Injekt EP is a two-component, solvent-free epoxy injection resin from MC-Bauchemie consisting of Component A (bisphenol A or F epoxy resin) and Component B (amine hardener) that, when mixed at the specified ratio and injected into a structural crack in reinforced concrete, penetrates the crack faces by capillary action, wets the concrete crack surfaces, and cures to form a rigid, high-strength epoxy bond across the crack — restoring the tensile, shear, and bending capacity across the cracked section to values at or above the original uncracked concrete strength. The fundamental distinction between MC-Injekt EP (rigid epoxy structural bonding) and the polyurethane injection resins (MC-Inject 1K and MC-Injekt 2K) is the target performance: epoxy crack injection is specified when the structural objective is to restore load-bearing capacity across the crack — making the concrete behave as if the crack had never formed; PU injection is specified when the objective is to stop water ingress through the crack — a waterproofing function — without requiring the bond to resist structural loads. The selection rule for Indian structural engineers is: if the cracked section is loaded in tension, bending, or shear under service loads (beam soffits in bending, column sections with seismic demand, slab mid-spans under live load), epoxy injection is the correct repair to restore the structural contribution of the concrete section; if the section is in compression under all loading combinations and the crack represents a durability rather than structural concern, waterproofing injection or surface sealing may be more appropriate. The low viscosity of MC-Injekt EP (100 to 400 mPas at 25 degrees Celsius) is essential for penetration of hairline cracks down to 0.1 mm width — at this viscosity range, the epoxy resin will penetrate cracks by combined injection pressure and capillary action, filling the crack faces progressively from the injection point to the vent points — a process that can take 15 to 30 minutes for a 5-metre long crack at low injection pressure. Space Arc Engineering supplies MC-Injekt EP for structural repair contractors, structural engineering consultants, and infrastructure maintenance agencies across Ghaziabad, Delhi NCR, Noida, and Uttar Pradesh.

Applications

• Structural beam crack injection — injecting MC-Injekt EP into tension-face bending cracks in reinforced concrete beams (cracks appearing on the soffit and propagating toward mid-depth of the beam section) in buildings and bridges where the cracks indicate overloading, inadequate design, or insufficient rebar and where the structural objective is to restore the full composite load-bearing action across the cracked section before applying additional strengthening measures
• Column and shear wall structural crack repair — bonding diagonal shear cracks or flexural cracks in reinforced concrete columns and shear walls in multi-storey buildings — particularly post-seismic repair where the earthquake has caused cracking of column sections and the repair objective is to restore the column to full structural service before applying CFRP or GFRP wrapping for seismic strengthening
• Prestressed concrete crack bonding — injecting MC-Injekt EP into cracks in prestressed concrete bridge beams, box girders, and pre-cast elements where cracking indicates loss of prestress, overloading, or manufacturing defect — the epoxy injection restores the tensile contribution of the concrete section by providing a rigid bond that supplements the reduced prestress action, while waterproofing injection would leave the crack as a structural discontinuity
• Slab crack structural repair — bonding mid-span and column-strip cracks in reinforced concrete slabs in buildings where the cracks have developed from construction overloading, inadequate curing, or design deficiency, and where the slab must be returned to full service load capacity without reducing its effective structural depth or cracked section modulus
• Foundation and raft slab crack repair — bonding structural cracks in reinforced concrete raft slabs that have developed from differential settlement, shrinkage, or construction loading — particularly in basement structures where the raft must provide full load distribution from the columns above and where slab cracking impairs the in-plane stiffness and load distribution function
• Concrete dam and water control structure crack repair — injecting MC-Injekt EP into structural cracks in reinforced concrete dam bodies, sluice gate piers, and weir structures where the combination of hydrostatic load, temperature movement, and structural demand requires both waterproofing and load-transfer restoration across the crack — crack injection is the most effective and least disruptive repair method for in-service dam structures

Key Advantages

• Restores structural tensile strength across the crack — cured epoxy develops tensile bond strength exceeding the tensile strength of concrete (greater than 3 to 5 MPa in tensile bond tests versus 2 to 3 MPa for concrete tensile strength) — the epoxy-bonded crack face becomes stronger in tension than the surrounding concrete, ensuring that future cracking occurs in virgin concrete adjacent to the repair rather than at the injected crack location
• Penetrates hairline cracks to 0.1 mm width — low viscosity (100 to 400 mPas) enables capillary-driven penetration of cracks as fine as 0.1 mm width without requiring high injection pressures that could fracture the surrounding concrete — critical for injecting the fine flexural and shear cracks that develop in reinforced concrete structural elements at service load levels
• Rigid cure — no post-cure creep or deformation under sustained load — the cured epoxy is a rigid thermoset polymer with compressive strength greater than 60 MPa and tensile strength greater than 30 MPa — capable of full structural load transfer across the injection crack under all design load combinations without the time-dependent deformation of flexible sealants
• Chemical and moisture resistance of cured material — cured epoxy is resistant to the alkaline concrete environment, groundwater, chloride, sulphate, and the range of chemicals encountered in industrial and infrastructure structural environments — long-term bond integrity without hydrolysis or chemical degradation over the 50 to 100 year design life of the structural repair
• Low injection pressure — the low viscosity enables injection at 0.2 to 1.0 bar — very low pressure that does not cause secondary cracking or delamination of the concrete adjacent to the injection crack — particularly important for injection in thin-section elements (slabs less than 150 mm thick, beam webs less than 200 mm) where high injection pressure could fracture the section
• EN 1504-5 compliant — compliance with the European standard for injection products for concrete repair (EN 1504-5) provides specification confidence for structural engineers designing repairs to EN 1504 principles — increasingly referenced in NHAI and state PWD structural repair specifications in India