What Is the Best Bonding Agent for Old Concrete to New Concrete?

When you’re joining new concrete to existing slabs in Kansas City, proper bonding determines whether the new layer adheres or separates. Kansas City’s wide temperature take a look swings and freeze–thaw cycles make choosing the right bonding agent critical for long-term performance.

Top Bonding Options

Acrylic bonding agents: The most common for overlays and patching. They’re water-based, easy to apply, and create a flexible film between old and new concrete. Epoxy bonding adhesives: Two-part systems that provide the strongest bond—ideal for structural repairs, vertical surfaces, and heavy-duty slabs. Polymer-modified cementitious slurries: Combine cement and polymers to improve chemical adhesion and match the coefficient of expansion between layers.

How to Apply for Best Results

Surface prep: Clean, degrease, and mechanically roughen the existing slab to open pores and remove sealers. Apply evenly: Roll or brush on bonding agent per manufacturer’s instructions. Avoid puddling. Timing: Some agents must dry tacky; others require wet-on-wet placement. Follow label directions precisely.

KC Climate Tips

click here Use products rated for freeze–thaw durability. Avoid bonding in direct sun or high winds; Kansas City heat can flash-dry the agent. Maintain surface temps between 50–80°F for best cure and bond strength.

Common Mistakes

Skipping surface profiling—smooth old concrete offers little mechanical grip. Using latex paint instead of real bonding agent—it peels under stress. Pouring without timing the bond layer properly—leads to delamination.

Bottom Line

For Kansas City overlays and patching, an acrylic or epoxy bonding agent matched to your mix type and temperature range ensures new concrete bonds solidly to old. Prep, timing, and weather awareness are the key to success.

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Pub: 11 Jan 2026 02:43 UTC

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