[Shop-talk] concrete not hardening

[Jack Brooks]

Shook,

It could be temperature; it could be how you mixed it.

Put a blanket or other insulation over it and wait a few more days.
Typically, the longer concrete takes to cure, the stronger it will be.

Jack 

-----Original Message-----
From: shop-talk-bounces at autox.team.net
[mailto:shop-talk-bounces at autox.team.net] On Behalf Of old dirtbeard
Sent: Friday, January 02, 2009 3:36 PM
To: shop-talk at autox.team.net
Subject: [Shop-talk] concrete not hardening

Hey shop talkers,

Well I set a footing yesterday (8" quick-rite tube with a Simpson 4x4 post
bracket) using no-mix, quick-set concrete and today it still has not
hardened.
I did it in the evening and the temperatures dropped into the 40's and I
know that cement should cure at 50 degrees or higher (I am in SoCal and was
not even thinking about a cold snap). I am wondering:
    - could the low temperatures caused the problem?
    - will it eventually harden?
    - will the strength be significantly diminished as a result of the low
temperatures?

Another consideration is that the concrete mix was over five years old and I
thought that may be an issue (looked good when I poured it in the tube,
though). Not a big deal, but I am hoping not to need to dig it out again....
:(

best,

shook
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