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Post by thebastidge on Aug 7, 2017 1:05:37 GMT
Further research shows the concrete cloth would not work for hulls. It's got a plastic polymer liner on one side, and doesn't really match up at seams.
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Post by thebastidge on Aug 9, 2017 0:42:59 GMT
My sample pack of basalt cloth is on its way. I've been reading lots of patent descriptions about Ferrocement boat hull construction. There are some concepts missing from the field.
Jeff, I still can't find any independent verification that Portland cement cannot be x-rayed, rebar inside or not.
i think you are incorrect, as the only discussion of X-ray difficulty I can find mentions the difficulty of placing film behind awkward hull shapes and support members, not anything about composition of the cement. Lots of places are advertising imaging services for concrete inspection. Ground penetrating radar, acoustic resonance, and where they can get a film plate behind it, X-ray.
The problem with calcium in OPC is the fact that seawater reacts with it (seawater is particularly good at interacting with various forms of calcium ions) and chemically rots the OPC matrix, crumblng OPC then cracks and fissures, allowing sulfur and chlorine ions at the steel reinforcement, corroding and swelling the steel, which spalls the concrete just like freezing water expanding in a crack would.
Take a look at this calcium/X-ray issue again, if you would. I think it may be one of those assumptions you 'know' to be true that simply isn't. I would be happy to read any authoritative source showing empirically that I am wrong.
In any case, type F low calcium flay ash based Geopolymer with basalt fiber reinforcement rather than steel mesh and rebar really seems to be the way to go.
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Post by thebastidge on Aug 12, 2017 14:49:30 GMT
My sample pack of basalt cloth arrived. Pretty cool stuff, MANY varieties of weave and weight.
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