To prevent the concrete from cracking while it s curing hardening cover it with a plastic sheet to slow the process.
How to repair concrete at garage vehicle door entrance.
Fixing curb how to fix a broken curb concrete sill repair or replace side entrance repairing a concrete curb or concrete sill can be difficult.
Or use non shrink precision grout in the crack.
Remove all the cut asphalt and scrape off any caulking material sticking to the edge of the garage floor.
You would removing a piece something like 8 foot by 3 or 4 inches.
Where my garage floor meets the block walls where the garage door comes down about 1 by 6 of the concrete has broken off exposing the rebar.
Fill the crack to a reasonable depth with sand backer rod and then apply a self leveling caulking or concrete crack filler.
It is only right at the entrance edges.
I can get all of the broken pieces out pack more sand or shaved chipped rock into the hole.
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Wetting the pad with a fine spray of water every two to three hours for the first day helps too.
This is more involved but it s permanent fix.
The old asphalt will lift up and break off in sections.
The more time concrete has to cure the stronger it will be.
Use quick setting cement plus bonding adhesive to repair the large voids from the broken missing concrete.
Once the starter row is in place and tamped apply additional patch material in 1 in.
Next build a starter row of patch material photo 2.