What is a good method for keeping cpvc conduit raised off of a concrete floor?

What you propose will work. You don't give much detail. You can support the conduit off the floor with cinder blocks, with a unistrut frame, by hanging it from overhead, supporting it off the wall (directly connecting the straps to the wall, or cantilevering it), and others. There are pipe supports available, too. But it's hard to give you any specifics without knowing your specific needs.