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- Mar 15, 2011
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- South Floriduh
crunchie -- What you say is true. I've lived down here for a loooong time. And one of the things I have noted is that if you are "on the beach", you cannot have any windows open. SALT will wreck your electronics and stuff.The whole strip along the Intracoastal from Miami Beach northbound past Palm Beach is not "bedrock", but a porous coral reef, with a lot of landfill to make it flat and even and continuous where there used to be mangrove swamps.
Undermining by ocean currents and waves seems quite likely all along the reef, imho.
And salt mist (essentially a daily thing) attacks concrete and follows any cracks to rebar. Frankly, I am surprised with 60 fargin MILES of tall concrete buildings built on sand a couple hundred feet from the actual ocean shoreline, that they haven't been falling down all over.
And nickndfl is spot on.
Here is a perfect example of what apparently happened from the crappy setup they had there:
From this technical site:
We get this quote (and see if it doesn't make you think twice about an ocean-front condo):
Here’s a fun fact takeaway: The intrusion of chloride ions, present in deicing salts and seawater, into reinforced concrete can cause steel corrosion if oxygen and moisture are also available to sustain the reaction. Chlorides dissolved in water can permeate through sound concrete and reach the steel. Chloride-containing admixtures can also cause corrosion.
Followed by this:
SPALLING: When steel corrodes, the resulting rust occupies a higher volume than the steel, which creates expansion and causes tensile stress to the concrete. Expanding corrosion of concrete-covered steel is like an internal pressure cooker to the surrounding concrete, causing it to spall. When spalling occurs, pieces of the concrete basically pop off (like an unsecured lid on said pressure cooker). Spalling can ultimately create more severe problems, because it perpetuates a vicious cycle.
If left untreated, spalls can accelerate deterioration by leaving even more steel exposed to the environment (see the ghastly photo below). In fact, rusting is one of the most common failure modes of reinforced concrete in bridges and buildings.
Would you park your car in this garage?