Concrete adhesive, also known as concrete bonding adhesive, is used to create a strong bond between new and existing concrete. Here's how to use it effectively:
Application Steps:
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Surface Preparation: This is crucial for a successful bond.
- Ensure the existing concrete surface is clean, dry, and free of any loose debris, dirt, oil, grease, paint, or curing compounds.
- Remove any unsound concrete by chipping, sandblasting, or other suitable methods. A rough surface is best.
- Pressure washing can also help clean the surface.
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Adhesive Application:
- Apply the concrete adhesive to the prepared surface using a brush, roller, or paint sprayer.
- Apply it to the thickness of a coat of paint. Don't apply too thickly, as this can weaken the bond. Follow the manufacturer's recommendations.
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Drying Time:
- Allow the adhesive to dry. The drying time is typically 2 to 3 hours, but this can vary depending on temperature and humidity.
- The QUIKRETE® Premium Concrete Bonding Adhesive instructions state that new concrete, cementitious topping, portland cement based stucco, or cementitious based repair material should be placed after the adhesive has dried.
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Pouring New Concrete:
- Place the new concrete, cementitious topping, portland cement based stucco, or cementitious based repair material as soon as the adhesive has dried. This is critical for proper bonding.
- Follow the manufacturer's instructions for the specific concrete mix you are using.
Important Considerations:
- Manufacturer's Instructions: Always refer to and follow the specific instructions provided by the manufacturer of the concrete adhesive you are using. Different adhesives may have slightly different application procedures or drying times.
- Temperature: Temperature can affect drying time and bond strength. Apply adhesive within the recommended temperature range specified by the manufacturer.
- Safety: Wear appropriate safety gear, such as gloves and eye protection, when working with concrete adhesive.
- Clean-Up: Clean tools and equipment immediately after use with the appropriate solvent recommended by the adhesive manufacturer.
In summary, proper surface preparation, correct application of the adhesive, and timely placement of the new concrete are essential for a strong and durable bond. Always consult the manufacturer's instructions for best results.
