The problem on site
When concrete beams develop visible cracks that extend deep into or completely through the member, structural engineers and project managers face a critical issue. Unlike hairline crazing on a plaster finish, structural cracks in reinforced concrete beams compromise the integrity of the element. These cracks disrupt the monolithic behavior of the concrete, interrupt stress transfer, and leave internal reinforcement steel exposed to air, moisture, and potential carbonation.
On active job sites, a common mistake is treating these fissures with superficial cosmetic repairs. Teams often apply polymer-modified mortar, cement slurry, or joint sealant along the outer surface. While this conceals the defect from view, it fails to address the structural separation within the core of the beam. The void remains open inside the concrete cross-section. Under sustained dead loads and dynamic live loads, unbonded crack faces continue to act as stress concentrators, which can lead to progressive deterioration and deflection.
Why it happens
Structural cracking through reinforced concrete beams usually originates from one of several primary mechanisms during or after construction:
- Overloading: Excessive construction loads, early removal of formwork, or operational service loads exceeding original design calculations can induce tensile stresses that concrete cannot resist.
- Foundation Settlement: Differential settlement beneath footings or columns induces unexpected shear and bending moments in the connecting grade beams and upper-level framing.
- Drying and Plastic Shrinkage: Restrained volume changes as concrete hydrates and loses moisture can generate high internal tensile strain, opening full-depth cracks in long-span beams.
- Thermal Movement: Severe diurnal temperature fluctuations across thick structural sections induce differential expansion and contraction, cracking unyielding structural joints.
Because the crack runs through the entire structural section, surface filling does nothing to bridge the load path. The two halves of the beam remain mechanically separate. True structural repair requires introducing a material that travels deep into the micro-fissures, displaces trapped air, and cures to form a rigid structural connection between both concrete faces.
How Space Arc Engineering approaches it
Space Arc Engineering works directly with site engineers, contractors, and project consultants to resolve structural cracking using pressure injection methodology. Rather than just selling materials off the shelf, Space Arc Engineering functions as an experienced technical distributor and practical solution partner on site.
The injection process requires precision and strict sequence control. Space Arc Engineering guides your site crew through a methodical, bottom-up injection procedure to ensure complete section filling:
Surface Preparation and Port Placement
The concrete surface along the crack path must be thoroughly cleaned using wire brushes or mechanical grinders to remove dust, laitance, oil, and loose particles. Injection ports or packers are then mounted directly over the crack at intervals determined by the depth and width of the fissure. If the crack extends entirely through the beam, ports and surface seals must be placed on opposing faces to prevent material escape.
Crack Sealing
Between the injection ports, the exposed surface crack is sealed with a rigid epoxy capping paste. This temporary or structural surface seal holds the injection pressure and prevents the low-viscosity resin from venting outward during pumping.
Systematic Bottom-Up Injection
Injection must always begin at the lowest port on vertical cracks, or at one end on horizontal cracks. Space Arc Engineering advises your application team to pump resin steadily at regulated pressure until clean, unfoamed resin begins exuding from the adjacent port. The operator then caps the current port, moves the delivery nozzle to the next port, and continues the sequence. This systematic approach expels air ahead of the resin front and ensures continuous filling across the beam depth.
The system we supply
As an authorised project distributor, Space Arc Engineering supplies Fosroc Nitofill LV, manufactured by Fosroc. Fosroc Nitofill LV is a specialised, low-viscosity epoxy resin injection system designed specifically for the structural repair of cracked concrete members.
By supplying Fosroc Nitofill LV, Space Arc Engineering provides contractors with verified material performance backed by the extensive testing and quality standards of Fosroc. The system delivers specific mechanical advantages for structural beam restoration:
- Penetrates Fine Cracks: The low viscosity formulation allows the resin to travel deep into internal micro-cracks and narrow fractures under controlled pressure, ensuring complete penetration of the damaged zone.
- Restores Continuity Through the Section: Once cured, the epoxy bonds securely to the fractured concrete faces, restoring structural integrity and load transmission across the original fissure.
- Injected Without Heavy Breaking: Unlike traditional section enlargement, jacketing, or breakout methods, pressure injection preserves the existing sound concrete. The beam remains intact without inducing structural shock or micro-fracturing from pneumatic breakers.
Space Arc Engineering ensures that project teams receive authentic Fosroc Nitofill LV along with the compatible accessories, injection packers, and capping mortars necessary to complete the application correctly.
What to check before you order
Before initiating an epoxy crack injection order, structural engineers and site supervisors must confirm several critical field parameters:
- Crack Activity: Epoxy injection produces a rigid structural bond. It is strictly suited for dormant (non-moving) structural cracks. If the crack is an active, moving expansion joint, flexible sealing systems must be considered instead.
- Moisture Presence: Check whether the crack interior is completely dry, damp, or actively leaking water, as this determines resin compatibility and pumping technique.
- Opposing Face Access: Verify whether you can reach and seal the opposite side and bottom face of the beam. If the crack passes entirely through, resin will escape unless the back side is properly capped.
- Crack Width: Identify the minimum and maximum crack widths along the length to verify suitability for low-viscosity resin injection.
- Equipment Readiness: Confirm that your injection pump, mixing vessels, air lines, and personal protective gear match the technical specifications required for two-component epoxy systems.
Talk to our technical team
Selecting the right materials and enforcing the correct injection sequence is critical when restoring load-bearing concrete beams. Space Arc Engineering provides full technical guidance, material estimation, and distributor support across northern India.
To discuss your site conditions or review product data for Fosroc systems, contact our technical team directly:
Phone: +91 99991 55255 / +91 72900 89007
Website: www.space-arc.in
Explore our complete capabilities: Visit our solutions to see how we assist contractors and engineers with structural rehabilitation and concrete protection.
Space Arc Engineering is located at 11/155, Sector 3, Rajendra Nagar, Sahibabad, Ghaziabad, Uttar Pradesh 201005.