Can I pour new concrete over existing concrete?
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Yes you can I just did it to raise an area but you need to some bond crete to make a thin layer so the new concrete can stick to the old concrete
You also have to make sure the old slab is not sealed. Pour some water from a cup on it, if it beads up, its sealed. If the water absorbs and spreads out ... your good to go, just clean throughly first.
A PVA Solution to help it adhere.
Why is it cracked? Find out why it is cracked and address that issue before pouring more concrete on the same spot.
: )
please visit the Quikrete website. They have ways of making concrete look brand new and beautiful!
My thought is if the old is cracked the new may crack as well. Check your drainage. We had that problem and had to put down new after putting in drainage tile. If you live in a cold/freeze area your new may crack again because of the shifting. It also depends on the size of the piece. The bigger the more chance of a crack. I finally gave up and removed all the concrete and replaced it with pavers that can shift without the danger of cracking.
Simply paving over will still leave the problem there . It will crack again. You may need to remove a section and fill in that area so it looks like a sidewalk. They use expansion joints; a material that can give when heat makes the concrete swell slightly. At the very least you have to open the crack so you can get cement down to the ground level.