Weight per volume of ferro cement

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This topic contains 3 replies, has 4 voices, and was last updated by  Anonymous 4 years ago.

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• #1680

Elwar
Participant

I have been searching the ‘net for the weight of ferrocement and get different results.

My overall question is, what is the smallest size hollow sphere made from ferro cement that would “float”? And by float I mean the weight of the cement is just below the weight of the displaced water.

I am too far out of college to get the volume measurements straight.

Any help would be much appreciated.

#16058

xns
Participant

The average density of concrete used in floors and load bearing walls is 2,200kg to 2,400kg per cubic meter. Hope that helps.

King Shannon of the Constitutional Monarchy of Logos.

#16061

just take the sphere volume calulator:

calculate 2 spheres – take outer sphere volum minus inner sphere volume for the concrete (wall) volume – multiply wall volume with 2,4 (specific weight of concrete).

If you have total concrete weight = outer sphere displacement (volume) – you have a neutral buoyant sphere.

To check on buoyancy see laws of archimedes.

Wil

#16131

Anonymous

You need to determine the thicknes of the concrete/ferrocement, by determining the depth it will be subjected to… Neutral buouyancy at the surface is not the same as neutral at depth. It varies with pressure, causing catastrophic failure, at some point.

That said, there were many small boats built of Ferrocement, the oldest being a canoe and still supposedly serviceable… Most hulls were around 2″ thick, if that helps…

Later,

J.L.F.

Never be afraid to try something new…

Remember, amateurs built the ark, professionals built the Titanic.

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