Hair line cracks in fresh concrete

samsung

Member
Location
North Yorks
Just on concreting our yard.
Full works visqueen, mesh, fibres, C45 .
As it dries we're getting hairline cracks appearing .
Its been tampered with mechanical and then float and brush finish.
I'm assured it won't affect finished strength , but its really annoying. !
Any suggestions.
Thanks S
 

HolzKopf

Member
Location
Kent&Snuffit
'plastic shrinkage' if conditions too sunny, warm or breezy. Fine spray, better still cover as well. Not easy if its a large area of course but plastic sheeting or tarps would be ok. Sacking that retains moisture is better. Some cracking in a slab is inevitable but surface crazing if it does dry out to fast is ok really as long as not deep
 

Forever Fendt

Member
Location
Derbyshire
'plastic shrinkage' if conditions too sunny, warm or breezy. Fine spray, better still cover as well. Not easy if its a large area of course but plastic sheeting or tarps would be ok. Sacking that retains moisture is better. Some cracking in a slab is inevitable but surface crazing if it does dry out to fast is ok really as long as not deep
All above good advice, you can get a spray that puts a film on top to stop the shrinkage cracking although your fibres should do this perhaps you are having it to wet and you could try a blended cement if the spec will allow it
 

samsung

Member
Location
North Yorks
Yep visqueen under all
Contractors said there is 2 tutypes of concrete, some cracks as you're laying it, the other cracks eventually !
True enough I suppose.
Thanks.
 

Vincent

Member
Location
Kildare Ireland
My dad always put a polythene sheet over fresh concrete and will keep some water under it for a few days after. This prevents the cracks from it drying out to fast. A few shovels of sand and timbers to keep the sheet in place.
 

David.

Member
Mixed Farmer
Location
J11 M40
^this
Wouldnt think of laying a slab without keeping it covered with silage sheet for at least a week, condensation under it is enough to keep it damp.
 

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