It depends on the project. If it’s a pad or slab repair, mixing concrete with a bonding agent allows you to work quickly and ...

ARDEX BACA is a two component, brush or spray applied coating used as an anti-corrosion agent for reinforcing steel as well as a bonding agent for fresh concrete or mortar to existing concrete ...

Now, given you are layering fresh concrete over an existing slab, a bonding agent like the Quiktrete Concrete Bonding ...