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Old 12-16-2015, 07:10 AM   #1
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Trick Question


It looks as if water soaked up through my concrete step, but not all of the surface indicates that. Why?

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Old 12-16-2015, 07:57 PM   #2
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no pic for me.
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Old 12-16-2015, 10:20 PM   #3
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Yep: your post is cursed with a black box with a big X in it.

Concrete will wick up only as high as the available water that is available in your ground.

You might get only a bit of saturated ground , or you may have a lot. Depending on seasonal changes.


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Old 12-16-2015, 11:17 PM   #4
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Pic from personal folder and posted through normal site procedures. Shows for me. Says it uploaded.
Attached Thumbnails
Trick Question-wet-step-15.jpg  

Last edited by SeniorSitizen; 12-16-2015 at 11:36 PM.
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Old 12-17-2015, 10:13 AM   #5
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Now I get a photo.

Was I ever mistaken in my first post. YES

How old is that step, if it is still curing I would not worry too much.

But if it is at least 6 months old you might be concerned.


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Old 12-17-2015, 11:29 AM   #6
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I poured the step 31 years ago. It's on sand that's dry as a bone.
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Old 12-17-2015, 12:19 PM   #7
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31 years.

it's cured.

Do you use a de-icer in the winter, that can discolor concrete?

Maybe some kind of cleaner came from inside the building.

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Old 12-17-2015, 12:22 PM   #8
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Quote:
Originally Posted by de-nagorg View Post
31 years.

it's cured.

Do you use a de-icer in the winter, that can discolor concrete?

Maybe some kind of cleaner came from inside the building.

ED
No and no to de-icer or cleaner.
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Old 12-17-2015, 12:24 PM   #9
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No wet looking area today. It all looks dry.
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Old 12-17-2015, 01:18 PM   #10
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Quote:
Originally Posted by SeniorSitizen View Post
No wet looking area today. It all looks dry.
No dry pics now. It's snowing on it.

Last edited by SeniorSitizen; 12-17-2015 at 01:21 PM.
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Old 12-17-2015, 01:54 PM   #11
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Could it be a small growth of concrete mold that shows when dampened or the light is just right?

A 10% chlorine bleach solution applied in warm weather will determine that. Rinse well.
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Old 12-17-2015, 05:30 PM   #12
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Quote:
Originally Posted by SeniorSitizen View Post
No wet looking area today. It all looks dry.
If it were moisture coming up through the concrete, it wouldn't dry up that quickly.

I think what you saw in that picture you posted was condensation forming on the SURFACE of the concrete. You have to remember concrete is heavy as sin. It cools down at night, and it takes a good few hours for it's surface to warm up during the day. During that time, as the air temperature (and humidity) rises, condensation will form on the still cold concrete. That makes the surface of the concrete wet, and it's easy to mistake that for moisture rising up through the concrete.

Also, if you live where temperatures drop below freezing in winter, then the water expanding as it freezes inside the concrete will cause something called "spalling" where the surface of the concrete breaks off in chips. Condensation on the surface of the concrete won't cause spalling because the moisture isn't deep enough in the concrete.
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Last edited by Nestor_Kelebay; 12-17-2015 at 05:41 PM.
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Old 12-17-2015, 06:02 PM   #13
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Nestor gets the A+ on the test question and has bragging rights as long as he wants. Good job.

The dry area in the upper right was 64F ( 17.7c ), damp area was 61F ( 16.1c ) and the dew point temperature was 62F ( 16.6c).
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