Ooooo, those are fun, but wear safety glasses and ear plugs, especially in a basement. If the new concrete is supported on either side by older concrete, and your base plate is somewhere near the middle, you should be OK, but that first week is still a bit crumbly. You'll know pretty quickly if it's gonna hold. You can always go back with a hammer drill and some redheads later.
Correction from earlier post; CaCl2 should NOT be slick, however it does absorb water, so it will stay wet. Your plastic pipe should be fine - its already chlorinated
