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Low strength concrete; residential

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Five or six homes (3,000 sf ea.) have been built on a slab-on-grade
foundation system in the Sacramento area.
The plans call for 2500 psi concrete.  There are no minimum sack content or
mix design requirements on the plans.
Due to 4-1/2 sack mix, hot weather (July, 98) and added water the 90 day
strength varies from 1100 to 1800 psi.

The developer wants to jack up the houses and remove and replace the
concrete slabs.
The cost per house is $100,000.

I am trying to help my client, the concrete subcontractor, resolve the
problem in a less costly manner.

Do you have any ideas?

What about sawcutting around the inside of the bearing walls and removing
all of the slab except that
under the sill plates?  Or even removing under the sill plates except for a
small "underpin" chunk and
regrouting under it?

I look forward to your comments.

Brad Friederichs