I have a lot of concrete in my yard that has several 2x4 6-10 foot wood expansions. The 2x4's are now between a 1/2" and a full inch above my concrete. What can I do to fix this? I thought about a hammer and chisel, but it would take me a year! Can I take the 2x4s out? I've had this concrete for about 15 years. No cracks anywhere just expanding wood!
Not knowing what you use this concrete pad for, you could take the plywood out and fill the gaps with polymeric sand. Once you water it in, the sand forms a locking pattern that resists weeds and is fairly easy to replace if it cracks.
I would first try using a sledge hammer to hit a scrap piece of wood laid over the 2x4. This may work. If not, I would try prying the wood out with a crowbar, starting at an end, and using a piece of scrap wood for the fulcrum. If that worked, I'd rip off the 1/2" or 1" part that protrudes with a circular saw. If you can't pry it out, I'd use a reciprocating saw with a 12" blade and force the blade flush to the concrete to cut off the protruding wood.