mike ring wrote:

"Mike" wrote in :


Just for interest, if it does deteriorate, could anyone explain the
mechanism - it would ease the pain of shelling out for a new bag!

It absorbs moisture from the air and forms hard lumps. If it hasn't done
this I still wouldn't recommend building a house with it but for a fence
post go ahead. The worst it can do is refuse to set.


That's the problem - it does seem to refuse to set, but I wanted to find
out how long I need to wait.

It's been 24hrs and my test bit is still toffeeish, it wouldn't hold up a
post.


Will take a couple of days at this temp to set hard.

I guess that means it's knackered, but with an undated bag, and it looking
perfectly good, it's a bit hard for a muppet like me to tell.


Its fine. You are just impatient.

If it didn't turn to rock, its OK. I just used a half bag I had leftover
from last year, and it went off allright in a coule of days, once I had
sieved the rock hard lumps out of it and used a bit more than usueal for
luck...

Oh by teh way, there is not size dependent cire time for concrete. Its
only depebndeint on temperature. generally it sets overnight in summer,
and about 2 nights in winter, to the level it feels 'hard' and takes on
full strength over a couple of weeks.

It takes time to DRY OUT though...


mike