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-   -   Side walk question (http://www.diychatroom.com/f105/side-walk-question-173748/)

rossfingal 03-06-2013 03:39 PM

Side walk question
 
We've got a side walk that was poured last Summer -
Bag mix -
Out of the sun - kept wet -
(Not down pouring rain)
Winter has come - there's a bag of rock-salt in the garage -
Ice build-up, on some spots -
It's not "spalling" -
Deteriorization of the surface -
From salt??

rossfingal

tony.g 03-06-2013 05:01 PM

If the concrete
was of the correct mix
of correct water:cement ratio
properly compacted,
protected from
drying wind,
it should not
be affected
by
salt.

concretemasonry 03-06-2013 05:16 PM

Anytime you use concrete in a exterior cold weather situation, it is generally accepted that it should be air entrained (5% air) to get freeze-thaw durability even with salt.

Dick

rossfingal 03-06-2013 05:50 PM

Thanks for the response, people! :)

"tony.g"
It was protected.

"concretemasonry"
It's "bag-mix" - could not get a truck in. (300 - 60# - bags)

Thanks again! :)

rossfingal

Mort 03-06-2013 07:13 PM

I believe they have bag mixes with air entrainment. Now, how accurate the percentage is (6%+/- 1.5), is anybody's guess. Chemical entrainment is easier to dose, but wouldn't survive being cooped up in a bag.

jomama45 03-06-2013 10:22 PM

Quote:

Originally Posted by concretemasonry (Post 1131265)
Anytime you use concrete in a exterior cold weather situation, it is generally accepted that it should be air entrained (5% air) to get freeze-thaw durability even with salt.

Dick

Quote:

Originally Posted by Mort (Post 1131337)
I believe they have bag mixes with air entrainment. Now, how accurate the percentage is (6%+/- 1.5), is anybody's guess. Chemical entrainment is easier to dose, but wouldn't survive being cooped up in a bag.

These two answers are correct. "Quickrete" and the like rarely make it through one decent freeze-thaw winter because the mix lacks adequate air entrainment.........


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