[GT182]

Phil, it sounds like a new floor will be required. Do you know if the original floor was reinforced with wire screen or rerod?

Here's an idea to save some money.... Rent an electric jackhammer to bust up the area you're going to replace. If it's wire reinforced all you'll need is a good set of wire cutters. Actually the broken up concrete could be compressed into the sand and used as a reinforcement too. Less cost for new cement. BTW, use 5000lb rated cement this time around.