Shavingcrete

[freebeard]

Basically using it for rubble fill?

Is it a rocket stove, or could you add an afterburner to it?

[freebeard]

Xist -- Found this:

news.mit.edu: Riddle solved: Why was Roman concrete so durable?

Now I want to make something out of concrete. Importing pzzalano would be difficult but this is just changing the order of mixing the ingredients. Worth making test ingots?

The only thing I can think of that I'd want made out of concrete would be a ferrocement pontoon boat [hull]. The reason being I saw this video on Screw-Propelled Vehicles: Surprising Advantages in Warfare

The unsurprising disadvantage is that you could sink one with small arms. So I propose that the helical screws be a ballast tank. Flooded, it would sink onto the displacement hull. But blow the ballast and it would rise up like a hydrofoil and go forward and back, tank turn and crabwalk.

[Piotrsko]

They had concrete barges back in Nam. Didn't sink any with small arms that I know of.

You can make roman concrete or even better using locally sourced materials. Some of the new additives are amazing. 2000 years, dunno. Roman structures could have been done dry laid no cement.

[Xist]

When I was a kid we visited a concrete boat once.

Mom told me yesterday that it broke loose and floated away.

[freebeard]

Piotrsko -- The helical screw tractors had hollow aluminum screws.

The Romans had a single source for their material.

https://www.britannica.com › technology › pozzolanic-cement
pozzolanic cement | cement | Britannica
Pozzolanic cements are mixtures of portland cement and a pozzolanic material that may be either natural or artificial. The natural pozzolanas are mainly materials of volcanic origin but include some diatomaceous earths. Artificial materials include fly ash, burned clays, and shales. Pozzolanas are materials that,…

IIRC Grand Coulee Dam used local pozzalana. The hot new amendment is flash graphene.

[Piotrsko]

Im confused then. Or you mixed topics unannounced

[oil pan 4]

Cellular concrete. Also floating concrete.
https://youtu.be/t65tbfU9sCI

https://m.youtube.com/watch?v=t65tbf...ature=youtu.be

[Xist]

"Soil is heavy, they taught us that in college!"

[freebeard]

Ontopic for the thread, but I watched the whole thing (1.75x) waiting for the 3D printed gyroid fill and it never came.

[oil pan 4]

Here is a post I made all about crash testing concrete. I stated out with abunch of tests I thought I should do but it really only ever boiled down to 2 things.
Firing a rifle a samples and Cost vs benefit.
Possible applications are clearly shelter related, counter tops, drive ways, starting your own military state, ect.
https://www.survivalmonkey.com/threa...testing.59189/

I read lots and lots of papers. All of them where hyper application specific and the intended audience was people who could talk the talk and walk the walk. People who have spent decades planning, mixing or building with it.
My challenge was find something relevant. Then when i did find something relevant, was it testable, then see if I could get ahold of the thing, make it into a small sample, test it and see if it would be worth it to use on a large scale.
Even knowing sometimes it wouldn't be worth it. Test it any way maybe a cheaper alternative would present it self in the future.
One set tests I knew wouldn't go anywhere, acrylic harder, super plastersizers and water reducers, these can be quite expensive. The cost was prohibitive but I later discovered free and cheaper alternatives by reading all those super application specific papers or reading about historical finds. People in antiquity where using some of these these and probably didn't have any idea why it worked.