We must search for alternative building materials for sure. Thank you.

Economics ppl purely and simple ECONOMICS get off your high horse and face reality.

apparently, the speaker fails to see that old-style buildings are even less economical, because they are dark inside and make inefficient use of space (due to need for thick walling). Imagine your workplace was a muffled old dark cold claustrophobic castle.

I work in construction of sky scrappers built, and it's crazy how much rebar is put into the these high rises. I don't like rebar and concrete so much work ,effort, money, time, and huge material waste. Construction has the highest rate of material waste. Even glass is a big part of sky scrappers, and glass is not the strongest material, and glass is made out of melted sand, and so much sand has been used to make glass, that now sand is running out. Me I like using wood but you can't build every structure out of wood because this would result in no more trees left, which means no more oxygen left. New ideals and materials is starting to be more available in today's time, but the worst thing is if it's not fire proof. 🤨🤔😇😇🙄🇨🇦

Car industry and oil industry lobbies are behind the way cities in America are build the way they are, to be car friendly and not human friendly also to increase the profit of the aforementioned industries.

Natural stone would be great, but... how to make it earthquake resistant? We know that brick and mortar will crumble from seismic events. Should earthquake zones only use steel construction?

1:34 what is concrete And the problem looks like this 4:45. This is visible everywhere in India for example

Eine oberflächliche und geirrte Geschichte.

super!!

Actually concrete makes ugly cities. The past cities are much more beautiful. The businessman like it because its quick.

im not a fan of brutalism nor do i know any

Do the rebars really HAVE to be made of steel? 🤔 It would probably be more expensive with rust proof rebarbs but perhaps the result would last longer.

This has been done in arab cities for thousands of years

Modern architecture is ugly; modern cities planning is suck!!

Humanity will rot.

Seems like a trand on videos I have seen that in the 60s and 70s they ruined alot of reaply nice stuff

Oh yes, let's house 8 billion people in low rise housing. The cost of land is really cheap these days.

and i can guarantee i won't make it to the end of the video, because the intro was some hyperbolic click bait fear wanky bullshit

How about using fiberglass rebar? I do realize that fiberglass rebar does not have the same strength properties... perhaps sheer or tensile strength is different. However, for many many applications, it could work just fine and that would resolve the oxidation problem for those structures. Anyone able to speak to this?

Add volcanic ash like the romans fixed the issue for them should do wonders for us.

Bake each level before building the next? Like contiguous brick perhaps?

Alternative rebar materials also help: glass or carbon fiber, or basalt.

Have to build out of stone to last thousands of years and point up the mortar every century. You would have to do pours basically with magma/molten stone somehow to build the way concrete is used to build and make it last like that.

The corrosion of the reinforcing steel elements increasing the volume of the reinforcing elements which cracks the concrete. The use of reinforcing elements of non corroding materials has not advanced into market use. Basaltic Fiber Rebar.being one.

In the Uk they are building a new railway called HS2. The bridges and viaducts are almost exclusively reinforced concrete. How long will they last I ask ? I walk in Derbyshire and see stone built railway viaducts and bridges still in use after 180 years and some canal bridges that are nearer 250 years old. Were they not a good investment? Some other bridges constructed in the 1960s are now in serious need of repair as the corroding re-bar has "blown off" the surrounding concrete. Short terminism is to blame! Excellent vid highlights these issues, but I suspect greed conquers all ?

nice

part of the problem is the reinforcing steel rusts and creates gaps

This is a video of ignorance! All reinforced concrete has a finite life depending on the depth cover to the reinforcement, type of reinforcement, chemical dosed during mixing, amount of water added to the mix and the type of cement , any cement replacement material used and the environmental condition the structure has to withstand. It is a total ignorance that a concrete structure could last for ever. Engineers today can compute the exact life span of a reinforced concrete structure. A publicly available software called Life365 has been available for at least two decades. Anti-corrosion chemical can be dosed in the mix, water added in the mix eventually evaporates to form pores so lesser water leads to denser concrete, cement replacement materials like micro silica, Fly ash and GGBS can be partially replaced the cement to make concrete more difficult to penetrate with water, stainless steel, epoxy coated or galvanized rebar can be used to reduce the risk of corrosion and external surface of structure could be protected by membrane. Many measures can be adopted to lengthen the serviceable life of a concrete structure and this is the duty of the designer. Hidden time bomb is the for the uneducated who has no practical knowledge on reinforced concrete design.

I always suspected that concrete that can be pumped through thin tubes cannot be strong. They will become powder after 20 years. If there is luck, building will stand only on reinforcement steel bars. The public bridges are the worst victims. But politicians will replace for contract money before expiry. What about residences..

Architecture as an endpoint in itself is incomplete. Architecture should be enabling, rather than oriented around worship of itself.

The most striking and memorable construction techniques and designs I have seen are those in some of the leading international 3D-printing design competitions, centered around designs appropriate for near-future construction of homes on Mars. Some of those designs, using native on-site materials, are very beautiful and appropriate.

Man, I love your videos! Incredible work! 🤌 Also very well placed reference to N. Talebs "Skin In The Game"! 🔥

low sound....seems like concrete stuck in the throat 😂

Good & interesting video. Oxidation of rebars would depend on humidity in places,, water flow / leakages etc so may be buildings in arid regions may last longer due to delayed / slower decay.

Nice job, Charlie!

'Contractors hav mostly lost the knowhow to build' .. this is certainly true in America , a storm , fire , hurricanes , tremors has devastating effects leaving cities towns villages in tatters , the insurance industry has stopped insuring these stick built houses & the knowhow to built good sturdy homes, r very minimum .

What’s the latest news on the use of either basalt or fiberglass rebar ? Awesome video, thank you ! 👍

Led coating will will help rebar last longer than any other thing that you can do to it.

There is a reason that all over the world they use reinforced concrete and have for over a hundred years. 1) Yes they are designed for 50-100 years. It is *very* expensive and difficult to retrofit a building older than that when we come up with new standards and things like HVAC that aren't a hundred years old. We don't live in buildings today that are a thousand years old. They're museums folks. There a dozens of reasons why you build to suit a current need and not try to predict the future of what people will need in that particular part of that particular city in a millenia. I don't know what the material conditions were of the Norman Invasion, but I do know they weren't putting in chases for low volt fiber optic cable in their architecture plans. 2) It's cheap. It the cheapest way you can build at scale. It's been good enough for every highrise apartment or skyscraper for over a hundred years. And it's ludicrous to say that it takes 50 years to pay off. They appreciate in value 3) Construction is a very slow to adapt business. The new ways of doing it might well be better, and hopefully cheaper. You're going to need a binding UN resolution to make every nation adopt the macro economics to make their way down to the city sized economics and make laminated timber the new default. If it's more profitable than everyone will switch over. 4) The sand problem is overstated. You can use different kinds of sand if you have a stronger cement design to compensate. There are also other mixes that use things like pulverized granite. 5) Graphene is going to save the day if it can ever leave the lab. Plenty of other meta materials that can fill in for steel when they also get cheaper. Laying down a spiderweb of it and then pouring concrete on top will allow for concrete buildings without the spalling.

there sure will be some interesting YT-videos in ooohhh...2074, with all the "worrisome" reinf'd. conc. bldgs fallin' over! me, I ALSO worry about the True-Longevity of metal NAILS in all our WOOD Structures, especially those of "pressure-treated" WOOD. Those smaller-than-Common-size Gun Nails don't seem to have "100-year" lifetimes to them, especially! just sayin' :-) wadayasdink?

REVOLT AGAINST THE MODERN WORLD!

If the buildings last 50-100 years then is it really that bad? Especially if it’s easy to build with.

Concrete - nothing but trouble. Ugly, often dangerous, and leads to a massive building scale that suits only multinationals with no interest in the locale.

Planned Obsolescence is the profitable model. Do I need to say more?

Bottom line: The USA needs to be torn down & rebuilt every 50 years

On one hand you are totally right, the massive and often crude use of concrete is a big problem nowadays. But on the other hand you aren't considering the reallity of much of those buildings: Many of them were build when millions of people needed homes. If millions of people search for living spaces it's a much better idea to build an appartment block where thousand people can find shelter than building a dozen single family houses for some dozen people! So it's true that they could have been build in a more sustainable way but two story family houses aren't the solution either.

Reinforcement can make buildings earthquake proof. Use of galvanised reinforcement will reduce rusting of the Reinforcement.

More Poundburys and less monoculture of shitty new builds with no character.

👍

We've regressed so badly, civil engineers two thousand years ago perfected the art of building stuff, and ever since its just been cost cutting. 😔