What You Need to Know About Concrete Adhesion
Concrete is a material composed of cement, aggregate, and water. Several types of adhesives can be employed to repair concrete. Concrete adhesives come in different formulas tailored to the type of material you’re bonding. Options are available for both small home fixes and larger, more advanced jobs. Whether it’s carpet fitting, gluing metal to concrete, or repairing roads, Loctite has the right concrete adhesive for the job.
How Concrete Adhesion Works
Clear the Surface
Remove any loose chips or stones from the surface area where you will be applying the concrete bonding adhesive. Also, make sure that the surface is relatively clean of dirt and debris by using a broom to sweep it away.
Prepare the Adhesive
Shake the container of concrete bonding adhesive vigorously for a couple of minutes before opening it. Then, pour a portion into a separate container and dilute with clean water; mix about one part adhesive with two parts water. The first application will serve as a primer for the final coat.
Prime the Damaged Concrete Surface
Take a paintbrush and apply the watered-down adhesive directly to the cracks or splits in the surface. Allow this to dry for a couple of hours, or according to the instructions included with your product, before continuing.
Apply the Concrete Bonding Adhesive
Once the initial primer layer has dried a bit, you can begin applying the final coat. Use the paintbrush again to apply the bonding adhesive; this time full strength, directly to the damaged concrete. When brushing it on, make sure to use a thick coat for the best results. Refer to the instructions on the container once again, and wait for the prescribed drying time.
Mix and Apply New Cement
If you'll be putting gypsum or finish plaster (instead of cement) on top of the concrete bonding adhesive, you should apply it while the adhesive is still tacky and not yet dry. Otherwise, continue with regular concrete when the appropriate dry time has passed. Follow the directions on your new cement for mixing it, making sure you have a wheelbarrow or a bucket handy. Then, apply it to the top of your bonding solution. Smooth the surface with a trowel and allow it to sit and cure properly.
What Will Concrete Stick To?
Concrete does adhere to wood, though the connection is often not ideal. Many builders use wood panels as forms that concrete is poured into to create a foundation or floor such as a patio with a pavilion finish or an exposed concrete wall. After the concrete is cured and dry, the wood is removed.
If you don’t want concrete to stick to wood, you would need to use a release agent to make removal easier. Lumber mills often pretreat their wood with oil-based blends to make it stick-resistant. If your wood has not already been treated, you may have to purchase a commercial agent and apply it yourself.
Concrete also sticks very well to plastic. Treating plastic with a release agent before coming in contact with concrete is the best way to ensure your plastic buckets and tools remain free of dry concrete.
What Will Concrete Not Stick To?
Concrete does not adhere to:
Concrete: Dried concrete doesn’t have any natural bonding agents, so to get wet concrete to bond to existing concrete, a bonding agent will need to be used.
Moulds: Most concrete moulds are made from urethane rubbers, which are designed to be resistant to concrete bonding.
Paint: Paint is another material that has no natural bonding agents, so concrete generally won’t stick to it very well.
Oil: Oil or oiled surfaces are often used to make the surface resistant to concrete bonding.
Other agents such as glue and mortar.
To promote adhesion, you’ll have to add the bonding agent yourself to get the concrete to work properly. If you’re repairing existing concrete, you’ll need to get the concrete to bind to these materials so that the repair lasts as long as possible.










