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Freezing & thawing damage in concrete
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| My 15 year driveway is starting to look pretty bad with all the pock-marks
caused by water freezing and causing dime sized holes to appear on the
surface. Is there a product that I can use to patch these holes? I try to
seal the drive each winter, but sometimes I get caught by a hard freeze.
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Posted via a free Usenet account from http://www.teranews.com
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| RicodJour 2006-10-30, 1:25 pm |
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Patch wrote:
> My 15 year driveway is starting to look pretty bad with all the pock-marks
> caused by water freezing and causing dime sized holes to appear on the
> surface. Is there a product that I can use to patch these holes? I try to
> seal the drive each winter, but sometimes I get caught by a hard freeze.
Those spots are either caused by using salt as a de-icer or due to
excessive moisture in the concrete mix when first place. What do you
use to seal the driveway?
There are assorted epoxy coatings and topping mixes, but they're either
not cheap or not very good.
R
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| hallerb@aol.com 2006-10-30, 5:25 pm |
| Use hydralic or patching cement.......
let it dry at least a week the DUMP on literally thompsons water seal
broom in place to spread, let dry it may take a couple days even if its
hot.
note concrete will now be a shade darkewr but not absorb water.
detoriatriuon will largely stop of you applied enough/
reapply every 2 to 3 years it wouldnt take nearly as much
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| ephedralover@hotmail.com 2006-10-30, 5:25 pm |
| Common Surface Defects
Concrete which has been damaged by cold weather commonly has surface
defects. The most common defect is spalling. Spalling is simply the
peeling or loss of the top finished layer of the concrete. It usually
happens because the upper surface of the concrete froze before enough
crystals grew to give this layer a strength of 500 PSI.
Popouts are another common surface defect. A popout is created when a
piece of aggregate (rock) in the upper surface of the concrete explodes
as a result of freezing. Some pieces of aggregate have a tendency to
absorb water. This water freezes, expands and BOOM! Gravel companies go
to great lengths to try to remove this type of rock from the gravel.
However, they don't always catch every piece.
Deicing salt damage is another common surface defect related to cold
weather. Scaling of your concrete can happen even if everything was
done correctly. As concrete is exposed to air, it gets harder. This
process is called carbonation. The carbon dioxide in the air reacts
with the concrete and creates limestone (calcium carbonate). Some forms
of limestone are very hard!
This carbonation process, however, usually takes one year to produce
any substantial differences in strength. So, if you use deicing salts
or they drip from the under side of your car onto your new slab, you
may have a problem.
Popouts can also be caused by dirty aggregates.
This might help.
http://www.vseal.com/surfacedefects/surfacedefects.php
Patch wrote:
> My 15 year driveway is starting to look pretty bad with all the pock-marks
> caused by water freezing and causing dime sized holes to appear on the
> surface. Is there a product that I can use to patch these holes? I try to
> seal the drive each winter, but sometimes I get caught by a hard freeze.
>
>
>
> --
> Posted via a free Usenet account from http://www.teranews.com
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| hallerb@aol.com 2006-10-30, 5:25 pm |
| keeping moisture out of the concrete stops the detoriationm after
thompsons water beads on surface and doesnt absorb to freeze and expand
doing damage
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| ephedralover@hotmail.com 2006-10-30, 5:25 pm |
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hallerb@aol.com wrote:
> keeping moisture out of the concrete stops the detoriationm after
> thompsons water beads on surface and doesnt absorb to freeze and expand
> doing damage
Well, I see a problem with this. Concrete is porous. It will absorb
moisture from the sides and bottom where it comes in contact with the
soil. Having a top coat will make the slab hold onto more moisture as
it can not evaporate as well as it could have.
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