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Cracked deck over seawall

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IRstuff

IRstuff

Aerospace
Jun 3, 2002
44,502
Based on these pictures, is the damage likely to be severe or not? It was bad enough to pop the adhesive and drop the tiles into the drink. Or was the tile installed on a previous patch job? It looks like there's a separate layer of concrete applied to the part where the rebar is showing.

IMG_2825_xi7pfr.gif

IMG_2824_ikune7.gif


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Perhaps we need a new forum titled "Pending Engineering Failures & Disasters"...

John R. Baker, P.E. (ret)
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The reinforcement is corroding, and the ferrous oxides created by that process are much larger in volume than the steel. The concrete spalls as a result. That is what laymen tend to call "concrete cancer". So yes, the condition is severe and requires action. It can be repaired, but needs a specialist contractor. The location over the water will present problems.
 
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What kind of a facility is this?

Any chemicals present other than the possibility of salt water?

May need a better maintenance program to prevent intrusion of solvents through the tile grout, as well as considering waterproofing the concrete from below.

Just a bad detail all in all.

I agree with the above too...

Mike McCann, PE, SE (WA)


 
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It's deck of a waterfront home, with seawall about 3 ft back from the edge of that deck, but it's OBE, since seller wanted a quicker contingency than the buyer could stand. [cry]

Thanks

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"OBE"?? Out of Body Experience??

Edge prep doesn't look very sophisticated to me.

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Also: If you get a response it's polite to respond to it.
 
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overcome by events (OBE) -- we seem to use that phrase at work a lot...

I think a previous owner saw the crack and "fixed" it by hiding it under the tilework; the current owner is not resident and may not even have realized that the deck is damaged. The first picture seems to suggest that someone had applied a fascia of concrete to cover up the exposed rebar and the continued rusting popped the fascia off on the left side of the deck, which also popped off the tile that was glued over that.

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I saw that type of damage a lot in Central America.
It starts when the concrete crew uses too much water in the mix to make the mix easier to place. You can get a nice smooth finish with a minimum of vibrating.
With more water than is needed for the chemical reaction of the concrete setting the excess water creates porosity in the concrete. Atmospheric moisture, acid rain, sea salt on windy and stormy days, all contribute to the corrosion of the re-bar.

Bill
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"Why not the best?"
Jimmy Carter
 
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