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Why is salt corroding my concrete

 

 

If you live in Canada, dealing with snow and concrete de-icers in the winter can feel like a necessary and annoying evil. De-icers like rock salt can wreak havoc on your cars, your clothes, and even the concrete you walk on. While the frustrations of salt seem far away there are steps you can take during this summer season to protect your driveway in the winter.

 

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How Salt Causes Damage to Concrete

 

There are three main ways that salt ruins concrete:

Melts and Freezes the Ice

Salt only melts snow and ice, it does not get rid of them
As they melt, the snow/ice mixes with the de-icer forming salt water
This salt water has a lower freezing temperature and therefore seeps into the porous concrete
As temperatures drop the salt water eventually freezes in the concrete causing it to expand, creating:

Chips
Flaking
Spalling
Pitting
Cracking

Crystallization and Subflorescence

As the moisture evaporates from the concrete the salt remains in its cracksEventually the salt recrystallizes in the pores of the concrete causing:

FlakingSpalling
This process is called subflorescence

Rebar Metal

Salt corrodes rebar metalIf rebar metal is present in concrete the salt will corrode and rust it
The rust will create pressure on the surrounding concrete causing:

SpallingCracking
Pitting

As the concrete gets more cracks it becomes more susceptible to salt, which makes it break down faster

How To Protect Your Concrete From Salt Damage This Summer

 

An easy step you can take this summer is to get an epoxy coating on your concrete driveway.

The treatment will seep into the pores of your concrete and will harden into a glasslike seal
This will prevent saltwater from seeping into the concrete, where the real damage is done
It won't break down when its exposed to salts, cold temperatures, or spilled chemicals
Also makes shoveling snow and ice easier if your floor is exposed to the outdoor

This treatment is much easier and quicker to install during the summer when cold weather and snow won't get in the way of working outside. Taking an extra step now will save you time, money, and wasted frustration in the future!

 

 

 

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Garage Enhancements Team
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June 20, 2019
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