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Old 10-11-2022, 05:18 PM   #151 (permalink)
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Basically using it for rubble fill?

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

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Old 01-06-2023, 05:44 PM   #152 (permalink)
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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.
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Old 01-07-2023, 11:50 AM   #153 (permalink)
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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.
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Old 01-07-2023, 01:08 PM   #154 (permalink)
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When I was a kid we visited a concrete boat once.

Mom told me yesterday that it broke loose and floated away.
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Old 01-07-2023, 03:59 PM   #155 (permalink)
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Piotrsko -- The helical screw tractors had hollow aluminum screws.

The Romans had a single source for their material.
Quote:
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.
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Old 01-07-2023, 07:46 PM   #156 (permalink)
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Im confused then. Or you mixed topics unannounced

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