Home and Auto Why is Rocksalt

DenverChief · 04-28-2008, 06:02 PM

AKA Ice Melt so detrimental to concrete? I just noticed our sidewalk leading to the house is flaking really bad...just wonding why

BIG_DADDY · 04-28-2008, 06:05 PM

Your sidewalk is flakey too?

**CrazyPhuD** · 04-28-2008, 06:11 PM

The reason why is that concrete does absorb water and while it is very good at resisting compressive loads(i.e. your car), it doesn't like being pulled or pushed apart. What happens with rock salt is that you melt the snow into a slushy mess. This slushy mess allows water to penetrate the concrete. That itself wouldn't be bad, however salt has a property of attracting water so the extra salt content in the slushy mess causes your concrete to absorb more water than it normally would. Again still not that bad yet. The problem is that usually even with the salt, the temperature will drop down enough at night so that the water refreezes.

This is the problem, as the ice crystals grow and form they can tear the concrete apart from the inside out.

It's the refreeze after the salt that does the damage.

DenverChief · 04-28-2008, 06:13 PM

Quote:

Originally Posted by CrazyPhuD

The reason why is that concrete does absorb water and while it is very good at resisting compressive loads(i.e. your car), it doesn't like being pulled or pushed apart. What happens with rock salt is that you melt the snow into a slushy mess. This slushy mess allows water to penetrate the concrete. That itself wouldn't be bad, however salt has a property of attracting water so the extra salt content in the slushy mess causes your concrete to absorb more water than it normally would. Again still not that bad yet. The problem is that usually even with the salt, the temperature will drop down enough at night so that the water refreezes.

This is the problem, as the ice crystals grow and form they can tear the concrete apart from the inside out.

It's the refreeze after the salt that does the damage.

ah ok...thanks

aturnis · 04-28-2008, 06:57 PM

Quote:

Originally Posted by BIG_DADDY

Your sidewalk is flakey too?

Dees is funny!

04-28-2008, 06:02 PM
DenverChief Pedantic Join Date: Mar 2001 Location: Rocky Ford Casino cash: $3072617	Why is Rocksalt AKA Ice Melt so detrimental to concrete? I just noticed our sidewalk leading to the house is flaking really bad...just wonding why
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04-28-2008, 06:05 PM	#2
BIG_DADDY THE RED MENACE Join Date: Aug 2000 Location: Texas Casino cash: $2558410	Your sidewalk is flakey too? __________________ The diabolical genius of Marxism-Socialism is that it provides the emotional and intellectual road map for autocrats to persuade millions of people to support their own enslavement to government. ~Mark Levin April 15, 2019
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04-28-2008, 06:11 PM	#3
CrazyPhuD Meow Join Date: Jun 2005 Casino cash: $10005050	The reason why is that concrete does absorb water and while it is very good at resisting compressive loads(i.e. your car), it doesn't like being pulled or pushed apart. What happens with rock salt is that you melt the snow into a slushy mess. This slushy mess allows water to penetrate the concrete. That itself wouldn't be bad, however salt has a property of attracting water so the extra salt content in the slushy mess causes your concrete to absorb more water than it normally would. Again still not that bad yet. The problem is that usually even with the salt, the temperature will drop down enough at night so that the water refreezes. This is the problem, as the ice crystals grow and form they can tear the concrete apart from the inside out. It's the refreeze after the salt that does the damage.
Posts: 8,523