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...
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...