What’s going on here?

Lawless

Member
Hi
Had a slab poured recently (Monday) and this has started to happen on the surface.
Should I be concerned? RC40 mix mesh no fibres.
643D3473-D87F-48A9-9034-47D304307AA8.jpeg
 

Highland Mule

Member
Livestock Farmer
Will it be ok.
what can I do to avoid it happening Again?

An expert will no doubt be along soon, but I think you can/ should cover the top during hot weather (with a polyethylene sheet or something) and maybe even get the garden spinkler out and occassionally dampen it for the first few hours. Remember that concrete curing is a chemical reaction, not a drying out process - it needs water to be able to go off properly.
 
Location
Suffolk
Get some straw or hessian and soak it or both. Soak it for a week now. If you've had the hot weather this week like we've had it in sunny Suffolk speed is of the essence.
WhyTF don't the concrete co's just put a note on the ticket on 'How-to-cure-concrete-properly-with-care!' It really isn't rocket science, just keeping it moist is so simple but such a big issue. A 150mm cube cured properly will rate another ten tons in the press against a poorly cured cube. I know we all did this at college and the results were interesting to put it mildly.

SS
 

David.

Member
Mixed Farmer
Location
J11 M40
Get a clean roll of silage sheet and waft it gently down onto the slab as soon as the wetness has gone off the top (try not to drag it over the surface), perhaps couple of hours from tamping and edging. Weight the edges down the outside of the shuttering with timbers or similar to stop wind getting under it, and leave it covered for a week minimum. The next morning the sheet will be sucked down tight to the surface, and the condensation underneath will keep the slab wet for the duration.
 

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read the TFF thread here: https://thefarmingforum.co.uk/index.php?threads/gfc-was-to-go-ahead-now-not-going-ahead.405234/
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