Concrete crack injection Sydney – epoxy and polyurethane repairs for waterproofing and strength.

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Crack Injection (Epoxy & Polyurethane)
Precision sealing and structural bonding of concrete cracks using epoxy or polyurethane injection systems, tailored to the cause, movement characteristics, and required performance outcome.

Concrete cracks can occur from shrinkage, movement, settlement, overload, or corrosion-related damage. Left untreated, they can allow water ingress, accelerate reinforcement corrosion, and compromise the structural performance of the element. Crack injection is a proven remedial method for restoring integrity and waterproofing, but it must be designed for the crack’s nature — epoxy for structural bonding, polyurethane for flexible, waterproof sealing.

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How We Deliver Crack Injection Repairs

  1. Investigation & Crack Mapping
    • Measure crack width, length, and pattern to identify cause and movement potential.
    • Moisture content testing to determine if the crack is active and leaking.
  2. Surface Preparation & Port Installation
    • Clean crack surfaces of dust, laitance, and loose material.
    • Install injection ports at calculated intervals (typically 150–300mm) for full-depth penetration.
    • Seal crack surface with a temporary epoxy paste to prevent resin escape.
  3. Resin Selection & Mixing
    • Epoxy Injection – High-strength adhesive resin to structurally re-bond cracked concrete.
    • Polyurethane Injection – Hydrophobic or hydrophilic resin to form an elastic, waterproof seal in moving or wet cracks.
  4. Controlled Injection Process
    • Inject resin under calculated pressure to avoid blowouts or further cracking.
    • Monitor backflow at adjacent ports to ensure complete fill.
  5. Finishing & Quality Assurance
    • Remove surface seals and ports once resin has cured.
    • Grind flush and apply protective coatings if required.
    • Conduct adhesion and leak testing to verify performance.

Applications

  • Structural Beams & Columns – Restoring load-bearing capacity.
  • Basement Walls & Lift Pits – Sealing against groundwater ingress.
  • Podium Slabs – Preventing water migration to occupied spaces below.
  • Façade Elements – Arresting crack propagation in exposed surfaces.

Why Atomic Projects for Crack Injection

  • Material-Specific Expertise: We use resin systems from leading manufacturers like Sika, Parchem, and Fosroc, matched to the exact crack profile.
  • Movement Analysis: We differentiate between static and dynamic cracks to avoid premature failure.
  • Engineer-Verified: All structural injection works are performed under engineering specifications for certification.
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Crack injection isn’t just about “filling a gap.” Done properly, it’s precision surgery for your concrete — restoring integrity, stopping leaks, and extending the structure’s life for decades.

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If you’re ready to get started, we're ready to help.

Take the next step and let’s build something that lasts.

 

📞 Call Us: 0410 515 509

✉️ Email Us: hello@atomicprojects.com.au

 

— Ben Tran, General Manager, Atomic Projects

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