Hello,

Last Friday I mixed up some concrete. Each mix was about 1/3 bag cement
(35k bags) with aggregate and water with a splash of washing up liquid.
All seemed well, but the last load was well into darkness so I was
working by security light with lots of shadow.

The final load was the top inch or three of the footings, so I levelled and
tamped it and covered it up for the night. It stayed covered for a few
days to protect from sun, but when I looked it was soft enough to push my
finger in!

The top few inches are affected, lower down seems solid, so :
1 What went wrong ?
2 Can I scrape the soft stuff off and simply replace with another batch,
perhaps overlapping the solid stuff sideways?

John

--
John Mulrooney
NOTE Email address IS correct but might not be checked for a while.

If you think you can - you can.