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Old 03-06-2013, 03:39 PM   #1
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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

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Old 03-06-2013, 05:01 PM   #2
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Side walk question


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.

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Old 03-06-2013, 05:16 PM   #3
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Side walk question


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
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Old 03-06-2013, 05:50 PM   #4
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Side walk question


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
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Old 03-06-2013, 07:13 PM   #5
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Side walk question


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.
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Old 03-06-2013, 10:22 PM   #6
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Side walk question


Quote:
Originally Posted by concretemasonry View Post
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 View Post
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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