my slab for my shop is 7 days old and is flaking. it was poured in 50-60 degree weather no rain on it for 2-3 days i live in texas so no freezing right now the land was dry before we poured it. the contractor is saying it was a bad mix and the concrete company is saying it was a good mix that its the contractors fault.there were 2 different trucks the first truck looks good the second is where the problem is. where the problem is the slab is a different color than the rest kinda a darker gray color. the concrete company came out today at the 7th day mark and did a hammer test or something to test the psi and said it was 2200 right now we ordered 3000psi any help would be appreciated
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