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Old 12-06-2015, 08:32 AM   #21
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Well, I knew. 😀


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Yeah, but your looks cool as heck
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Old 12-06-2015, 11:33 AM   #22
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Maybe I should have said many, a lot on the East Coast are. Have dove on several liberty ship artificial reefs and there is a good example of a breakwater built from them at the entrance to the harbor of Cape Charles, Virginia.

Ted

The Kiptopeke breakwater is made out of McCloskey concrete ships as well.
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Old 12-06-2015, 11:45 AM   #23
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Same idea: The tunnel crossing the Fraser river, for highway 99, was built ashore, of reinforced concrete, floated into place and sunk. That was done in the early 60s and is now scheduled for replacement by a new bridge to be built in the next few years.
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Old 12-13-2015, 08:50 AM   #24
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ARCHIVED - USQUE AD MARE - Ship Details - CCG Publications
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Old 12-13-2015, 09:09 AM   #25
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Ferro-cement the was a favorite building material for amateur boat builders for many years. They thought it would be an easy cheap material to work with. It just made crappy boats that soon bled rust through the concrete. Back in the 1970s there was a company that made ferro-cement houseboats on the Miami River. They went bankrupt pretty quick.
All new(er) house boats in Holland (and there's a lot of them) have concrete tubs. Done right they require no maintenance and last (almost) forever....

Of course "done right" means the right mix, additives, metal reinforcement design, curing schedules/temperatures.....etc etc.

Do a Google Image search for "drijvende huizen"...... there's some amazing stuff there, including floating neighborhoods. When there's plenty of water and not enough land, you get creative.
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Old 12-13-2015, 09:13 AM   #26
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All new(er) house boats in Holland (and there's a lot of them) have concrete tubs. Done right they require no maintenance and last (almost) forever....

Of course "done right" means the right mix, additives metal reinforcement design.....etc etc.
Maybe "done right" means they stay in fresh or brackish water.
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Old 12-13-2015, 09:14 AM   #27
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I am indeed not aware of concrete tubs in salt water.
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Old 12-13-2015, 11:23 AM   #28
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I am indeed not aware of concrete tubs in salt water.
Our Hood Canal bridge floats in salt water...

https://en.wikipedia.org/wiki/Hood_Canal_Bridge

HOLLYWOOD
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Old 12-13-2015, 01:31 PM   #29
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I am indeed not aware of concrete tubs in salt water.
Ferro-cement is ideal in salt water - the effect of osmosis is to help pull the water OUT of the cement, which cures it. This process continues FOREVER as the cement gains in strength, though it becomes immeasurable after a number of years.


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Old 12-13-2015, 01:45 PM   #30
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Our Hood Canal bridge floats in salt water...

https://en.wikipedia.org/wiki/Hood_Canal_Bridge

HOLLYWOOD
Not the poster child for chloride resistance. The first one didn't last very long...
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Old 12-13-2015, 01:50 PM   #31
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Ferro-cement is ideal in salt water - the effect of osmosis is to help pull the water OUT of the cement, which cures it. This process continues FOREVER as the cement gains in strength, though it becomes immeasurable after a number of years.

Keith
Yup. I've got compressive strength for cores for many years of the Powell River Hulks. Keeps getting stronger and stronger.

Chloride intrusion wise, some hulks actually do much better than the ACI 100 recommendations for modern concrete construction. Lots of engineers and scientists scratching their heads on that one. They figure it has something to do with the paste matrix from the materials the used to construct.
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Old 12-13-2015, 02:51 PM   #32
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Old 12-13-2015, 03:42 PM   #33
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The sistership of the Atlantus is still floating at Powell River.

Keeping a ship afloat, instead of intentionally grounding, tends to increase it's lifespan.

Other intentionally grounded concrete ships in Bimini, California, Oregon, Hawaii, Kwajalein Atoll, Normandy, Cuba, Texas, and Virginia aren't fairing so well either.

Oxymoronically, the intentionally sunk concrete ships in Chuuk Lagoon and Guam are well preserved.

The other floating concrete ship I am aware of is tucked away in a cay in Belize, still functions as a tanker, and is used to store molasses.

So, if you own a concrete ship, in summary: Floating, good. Grounded bad. Sunk, OK.
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