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  • Users: Gammyleg
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  1. Gammyleg

    Concrete Bleed Water Staining

    Hi, Can anyone confirm what the black material is on the attached photo. Photo taken after finishing of basement floor slab. It's a blended CEM1 & GGBS F5 flow mix which, upon inspection of the placement records, was regularly in excess of maximum flow limits and hence exhibited excessive...
  2. Gammyleg

    Combining different concrete mixes in one pour

    Hi, I have come across a few instances where different grades of concrete have been placed during the same pour opearation, eg C40 concrete for the main slab & c60 concrete below where the columns will sit, also similar with waterproof & non waterproof mixes. The latter presumably being most...

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