Side walk question

rossfingal · 03-06-2013, 03:39 PM

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

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

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.........

03-06-2013, 03:39 PM	#1
rossfingal "Nail-Bender" Join Date: Mar 2011 Location: Western suburbs, Chicago, Il. Posts: 2,129	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

03-06-2013, 05:01 PM	#2
tony.g Member Join Date: Apr 2012 Location: non-US Posts: 546	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.

03-06-2013, 05:16 PM	#3
concretemasonry Member Join Date: Oct 2006 Location: Minneapolis/St. Paul, Minnesota - Latitude 45.057 Longitude -93.074 Posts: 3,357	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

03-06-2013, 05:50 PM	#4
rossfingal "Nail-Bender" Join Date: Mar 2011 Location: Western suburbs, Chicago, Il. Posts: 2,129	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

03-06-2013, 07:13 PM	#5
Mort World's Tallest Midget Join Date: Nov 2008 Location: Twisp, WA Posts: 484	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.

Side walk question