Assuming this is just a cosmetic repair (you don't plan to put heavy load above the patch), it is a simple matter of cleaning the hole by brushing to remove loose debris, mix up the concrete, place. I agree with the post about mixing it up dry, much stronger, less likely to crack. I would not be too concerned about bonding to the existing concrete, assuming this is a cosmetic fix rather than structural.
I would avoid hydraulic cement, costs more, sets very quickly, no aggregate, so is not as strong as normal concrete.
I would avoid hydraulic cement, costs more, sets very quickly, no aggregate, so is not as strong as normal concrete.
