Q&A for How to Adhere Concrete to Concrete

I personally use water and a wire brush to clean off my tools. I put the excess concrete in a contractor-grade trash bag and then dispose of it. Make sure you're cleaning everything off right away so the concrete doesn't harden on anything.

Try Bondo. It feels like putty, sets quickly and sticks to wood and other material. As it is an epoxy itself, it will form a good base for epoxy paint. Although it's advertised for auto body work, it can be used in construction projects as well. You can get it at Home Depot.

You can, it won't adhere to anything, though. One usually employs grout for such tasks. Since your pavers are exposed to the sun, they heat and cool, which makes them act as if they're breathing. Select backfill, sand, or the cheap stuff the quarry sells (the dust stuff, though it's not dust). These tolerate the heating and cooling better, and allow the pavers to shift as needed. You can use concrete, no question, it's just not the best choice for long term durability.

It won't form a true bond, but you can use PVA glue and a leveling compound mix. Make sure you soak bonding edges with water first.

You can't fix this easily. You could either dig out one or more grooves in the sidewalk so that they act as drains and divert water away from your house or build up grooves above the surface so that the water is stopped from entering your house.

Try using E6000 adhesive. I just used it to glue pieces of a fountain back together. Treat it like concrete, keeping moist and covered for several days to build strength. I dabbed some leftover stain on mine to make it match the fountain coloring as much as possible.

Utilize mesh screening or a wire reinforcement, that will help it to adhere better. Also, don't make your cement mixture too "soupy," as it will just run down. Don't forget, if you add extra water beyond the manufacturer's recommendation, you'll lose viscosity and your cement will be weaker.

Using a cement bonding slurry will greatly improve the adhesion between the paving bricks when you reset them.

No, the concrete slurry will start to set as soon as you mix it together and will become unusable after 1 hour. Unfortunately, it can't be stored for later use.

Yes, you can use a concrete mixture to apply it where the steps are crumbling, though they may not last long before they start to crumble again.

Applying a thin layer of bonding slurry before you add new concrete will help with adhesion and fill the joints.

Create a bonding slurry, apply it to both beams, then use a new concrete mixture to connect the two slabs.

Pin it together. Drill a hole in the leg and the bench, put in a 4 to 6 inch rebar and use mortar or grout to lock it in.

No, you would need support so that it doesn't cave in on the existing concrete. The rebar provides extra support for the new concrete. This will also help it last longer.

The concrete won't stick to the paint so if you want to do a good job you should remove the paint first. You can try using a heat gun for this.