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I trust any engineer who responds with an “it depends..” over someone who has an absolute answer. Stainless would probably do ok but I’d assume stone or fiberg
by dieselgate 4y ago
I trust any engineer who responds with an “it depends..” over someone who has an absolute answer.
Stainless would probably do ok but I’d assume stone or fiberglass/FRP would be superior over time out in the elements. But not the best stuff to build a house with.
Oh what about titanium?
Edit: lol oh well even timber structures Can last a millenium if maintained
- avodonosov 4y agoWhy not simply use gold?
- WhatIsDukkha 4y agoGold attracts vermin.
- Nomentatus 4y agoHow poignant, that the obvious solution is the worst "solution" of all, due to human nature.
- gnfargbl 4y agoConcrete, bricks and granite can also work pretty well... as the Pantheon in Rome proves.
- Nomentatus 4y agoNot to mention the wooden beams, under the portico, which are also original. They of course, are out of the rain; so are a solution to a lesser problem, where aging is concerned.
- RhodesianHunter 4y agoWe don't make concrete like the Romans did though.
- elcritch 4y agoStill concrete will still last longer than most other materials. The biggest issue with modern concrete construction is the usage of reenforced concrete using iron or steel rebar which tends to corrode quickly. Reenforced concrete seems to have a half life of ~50 years.
- magicalhippo 4y agoWill be interesting to see how carbon-fiber reinforced concrete[1] fares in comparison. [1]: https://www.compositesworld.com/news/tprc-research-studies-void-removal-mechanisms-in-vbo-processing https://www.compositesworld.com/news/tprc-research-studies-v...
- smegger001 4y agostainless steel rebar and polymer coated rebar are also options for reinforcing concrete that have a lot of potential, as the issues is moister induced rusting of the rust rebar expanding and cracking the concrete there are multiple solutions that i don't know that we have data on the long term durability of yet. I wonder how one would go about artificially aging something embedded within a block of concrete to test for that.
- mikewarot 4y agoIt appears that coated rebar just offers a channel for the ingress of water, and thus corrosion, if there is a break anywhere in the coating, like a wick in a lamp. Basalt fiber rebar might be a better way to go, as it won't oxidize. Studies will be needed to find out if it actually is better in the long run.
- XorNot 4y agoWe do actually, it's just not as useful and used in more demanding applications. The biggest problem is rebar spalling though, not the concrete.
- vkou 4y ago
- roywiggins 4y agoStone and adobe, in the right conditions. https://en.m.wikipedia.org/wiki/Ancestral_Puebloan_dwellings https://en.m.wikipedia.org/wiki/Ancestral_Puebloan_dwellings
- breischl 4y agoIn those conditions even plain, untreated wood lasts a long time. Many of those structures still have wood beams in pretty good condition. ie, the durability of those structures is more due to where they are, than what they are made of.
- ghaff 4y agoAlthough (at least the right) stone is almost certainly a pretty good answer in general. There are plenty of historical examples and I'm skeptical that anything else exposed to the elements would do better. And if not exposed to the elements that feels like cheating.
- breischl 4y agoFair, but the sandstone and clay in that area is generally pretty awful. TBH most of the ancestral Puebloan structure are crumbling apart despite being protected by overhanging rock "roofs".
- ghaff 4y agoYou're right about the pueblos specifically. They're still extant mostly because the climate is so dry there. Something like granite would be a much more long-lived structural material in wetter climates. Indeed that's the primary stone used in, say, Machu Picchu.
- Spooky23 4y agoIt depends on whether they are occupied or not. I worked on an upstate New York farm with a barn that was post and beam, with a stone foundation. It was ~350 years old but had a good roof for that entire time.
- elil17 4y agoFiberglass/FRP is an interesting one. I believe the limiting factor there would be that the polymers used would slowly degrade/weaken over time due to chemical aging. Fiberglass boats last up to 50 years but that is in a harsher environment - not sure how long you could go on land. Perhaps some polymers could be formulated to last that long, I'm not sure.
- mikem170 4y agoUV from sunlight degrades fiberglass/FRP over time. I believe that boats are painted to protect them from this, and need to be recoated periodically because the uv sunlight will degrade the paint eventually, also.
- elil17 4y agoSeems unlikely that you’d have a reliable source of paint for 1000 years, which might be the limiting factor. But there’s always some rate of chain scission, even in the absence of UV/water/whatever. I just have no idea whether that has a meaningful impact on material properties over 1000 years.
- heavyset_go 4y agoI feel like if you're really hard pressed for a UV blocker you could just use mud.
- svachalek 4y agoYeah I've seen old boats turn to dust. UV utterly destroys fiberglass given a little time.
- dieselgate 4y agoThey can last a lot longer than that but that’s about the duration that frp has existed for boats, probably early ‘60s is when production boats started to use frp hulls. Frp is great for fuel tanks and exhaust systems - it’s superior to stainless for these applications (corrosion resistance being key factor). But yes as mentioned by sibling UV will definitely degrade
- dsfyu404ed 4y ago>I trust any engineer who responds with an “it depends..” over someone who has an absolute answer. That heuristic matches on the hordes of liars who try and sound smart while hedging their claims with a liberal application of weasel words to avoid being provably wrong. And those people outnumber the "good engineers" probably by at least an order of magnitude...
- HPsquared 4y ago"When a measure becomes a target, it ceases to be a good measure."
- renewiltord 4y agoIt is, however, far more interesting to me when people are able to split the hypothesis space well. For instance, take the question "Is drinking 1500 ml of water daily good for you?". Well, that depends on what other fluids you consume, whether or not you are on an IV as well, and whether or not you are drinking it by accidental consumption via waterboarding. It even depends on whether or not Baldur the Interstellar Water Hunter exists and will kill you for every drop over 1499 ml that you consume. It's true, it does depend. But machines can exhaustively describe the hypothesis space now. Comprehensiveness is not the only virtue of a human.