What you need to do first is to check if you have that room near the threshold of the door for that extra concrete(which is minimum of 3.5" inches) then you need to remove the top surface of the old concrete to be rough surface don't break too much just about an 1"wash clean and let it dry and only then to install the new concrete.
not normally. it depends on what you are trying to accomplish. if you need a thin layer than you can pour a thin set layer which hardens and adheres better than concrete. if the added part is thicker you can drill holes in the old and put re bar in then pour on top to help tie the two together.
how much does it cost to form and pour concrete in Mobile, AL
about how much to pour a concrete slaba 12 x 14'
it can be done == you can pour self leveling cement mixture over old concrete but you must first rough up surface of old concrete then put bonding agent then mix self leveling mix very wet so you can pour from high spot and it will run to lower areas . Use wood furring strips ripped at an angle to compensate for the angle in the sloped concrete.
No. Concrete won't bond to concrete. It will end up cracking.
not normally. it depends on what you are trying to accomplish. if you need a thin layer than you can pour a thin set layer which hardens and adheres better than concrete. if the added part is thicker you can drill holes in the old and put re bar in then pour on top to help tie the two together.
how much does it cost to form and pour concrete in Mobile, AL
about how much to pour a concrete slaba 12 x 14'
POUR THE CONCRETE OVER THE BRICK
There are a number of ways in which you could prepare the ground to pour a concrete curb. You could level the surface and pour sand.
it can be done == you can pour self leveling cement mixture over old concrete but you must first rough up surface of old concrete then put bonding agent then mix self leveling mix very wet so you can pour from high spot and it will run to lower areas . Use wood furring strips ripped at an angle to compensate for the angle in the sloped concrete.
pour more concrete over the top and smooth it out
You pour liquid concrete into a frame and let it set.
No. Concrete won't bond to concrete. It will end up cracking.
Yes
Yes, but you will need to reinforce with a wire mesh and then pour.
pour card poor or fare