Basement concrete floor repair after sewer drain line replacement
I had a "professional" plumbing outfit replace my sewer drain line this summer. This included about 15 - 20 feet in the basement. The new line itself is working fine but the concrete job they did to put the floor back in place is horrible. During the dry months, the concrete dried, looking as it should. But now that the ground is wet again, the concrete is very wet looking, especially around the edges of the job and after about 2 months of this, there is a white film appearing on the wet areas. The plumber came back out today and has offered to tear it all back out and do the job over. I know that they dug up the area, replaced the pipe, and then backfilled with the spoils, and put a skim coat of concrete back over top. He says now that they should have backfilled with pea gravel.
My question is, is how he proposed to "fix" this job really going to do the trick? Are there other materials or methods they should use to do the job the best?
In case it matters, I live in south western Ohio.
Thanks for any advice.