Yes. Please tell the lefties that cement when curing natural sequsters C02.

Thank you for sharing, glad to hear co2 gets back into the concrete.

are you an engineer?

I did the control systems for a preheater precalciner system. It had a short kiln…the clinker cooler was the hardest to keep smooth control.

Cement absorbs Co2 ? Thought that was just lime ? Cement hardens from hydration though right ?

It was the Romans, not the Egyptians. Volcanic ash, called pozzolana, or pozzolan, was mixed with slaked lime, and that mix was mixed with sand and gravel to make Roman concrete. It lasts for thousands of years.

​@@robinpage2730 ...and cures in seawater too!

@@robinpage2730 I heard it also had tiny chunks of sea shell embedded in it. Seems the shell was a reservoir of calcium carbonate that seeped into the surrounding cement material over eons and sustained its structure. When we made it, it was all ground very fine for strength and fast set. The Roman stuff lasted, well it still lasts…

​@@robinpage2730 Pozzolana is not just a form of volcanic ash but as a sandy form of volcanic ash made out of micro-particles of micro-porous silica almost like diatomaceous earth to allow 10,000 times more surface area to react with the burnt quicklime or slaked lime to form a NON-POROUS calcium silicate which is also very strong. Since the late 1960s many scientists and engineers has been trying to find ways to improve on this principle of calcium carbonate to silica inter-reactions. In the Eastern Roman Empire they have no pozzolana or pozzolana sandy volcanic porous ash but they instead used a substitute called crushed and powderized bricks which has been crushed and grinded until it is as fine as white flour. How long it will last? One archeologist demonstrated how that product is made by mixing an equal volume of burnt quicklime and powderized brick powder and adding sufficient water to form a mortar and slap on on a rock wall wet with sea water to make it water proof and he said "IT IS GOOD FOR THE NEXT 5,000 YEARS!" Others use either silica sand with a silica content of 95%, or silica brick with a silica content of 97% or, quartz-quartzite-diatomaceous earth with a silica content of more than 97% up to more than 99%. They are all crushed, pulverized, grinded, powderized to become as fine as bleached white wheat flour so that they will dissolve in water (water is a universal solvent) and when mixed with water soluble burnt quicklime or slaked lime they form calcium silicate cement. One scientist-engineer went so far by mixing an equal volume of sodium silicate (waterglass with a 50% silica content and 50% sodium carbonate content) mixed and dissolved in hot water and allowed to cool into a viscous liquid similar to honey and then mixed with an equal volume of burnt quicklime or slaked lime until both has completely dissolved together (plus some additional water so that he can add a calculate volume of sand and-or graded gravel which are both mica free so that the resulting cement mortar and-or concrete is very strong) that he ended up with a weird form of almost glassy or glazed form of calcium silicate mortar and-or concrete which is very strong and virtually non-porous!

Modern Portland Cement is simply synthetic volcanic ash. You can use any kind of silicate, it's the temperature, heating and cooling times that determine the quality of the final product.

I don't even remotely believe that whole Hoover Dam claim. It sounds like another asinine claim to wow and dumbfound the masses.🙄 Are we to believe that they imbeded wireless Tempurature sensors throught the concrete? Concrete Dams are poured in blocks, using a quick curing cement, and each block is essentially cured by the time another block is poured on top of each block. Are we to believe that the Hoover Dam is the one concrete structure in the world that somehow created an anonymous forever lasting chemical reaction that defies Physics?

If you're going to unnecessarily criticise an excellent informative video , the least you could do is basic schooling beforehand. Typical arrogant illiterate American. 'Except' & 'screed' by the way . Apology accepted

Except not accept

Thanks. Learning to accept criticism.

Oh, Thanks. I didn't no.

Great tip!

I would definitely qualify as a retarder. Are there job openings?

@@wanderingfido only for the competition ;)

Throw a can of coke in the back of the mixer to slow it down…

@@RajinderYadavdo you snort a sample of the batch to see if there’s enough in there?😂

Glad you enjoyed it!

What’s happening on the thumbnail?

​@@Factora_engstop using words over and over you bore people and sound repetitive like crazy

And he's very good with the words me thinks.

Some are huge and are lined with 6-9in brick to keep in the heat. It's pretty cool to see one while running. The heat the put off is crazy.

I always wondered where cement came from since it gets hard when wet. I thought it had to be mined from deep underground or something.

Glad it was helpful!

Amennn, and, i wonder, why it wasn't invented by our black brothers ... ?

Hey! I'm making a documentary about cement factory workers. I would love to hear about your time working there.

40kg of cement is only 3.88 dollars

Cement isn’t concrete. But yeah, in Idaho 80 pounds of premix concrete is $7.62

Thank you very much!

Not Ai

Totally AI.

@@Factora_engsure sounds like it.

@@Factora_eng Maybe it's not but pronunciation of a number of words was just wrong. Maybe not AI but seems like a computer. A native speaker would just know that doesn't sound right.

​@@Factora_eng 1:42 No human would read, "cydrilical" when, "cylindrical", is misspelled. That is AI 100% proof. In the words of Will Ferrell... "I wish you weren't a liar" Absolutely disgusting to lie about it

Glad it was helpful!

The first thing that ran through my head!

😅

🤔

Me2 !!! ! !!! 😀

I know 🤯

You bet!

Thank you!

stable food supply, the rest follow after, mostly from boredom or one up your rival

@@mandalamarcho7997 Amen, Because, before that, people had to spend most of their ime just working 4 the food 4 surviving. That is why the Progress couldn't be achieved.

Glad you enjoyed it!

🙌

Wear a good quality face mask. The dust will kill you faster than smoking. I am 70 years old, and retired. I occasionally worked around carbon black refineries. I wore a full quality face mask and used petroleum jelly around my ears. I still had to blow my nose to get rid of some carbon black. I never never got in my vehicle before a good shower. Carbon black is just like coal, causing black lung cancer.

Cool, thanks

How would that be ??

Especially if it’s in China and not in the correct quantities as it should have been. Tofu-Dreg project is so very bad that buildings are failing. Very bad

You actually believe this?

They added pozzolan (volcanic ash, which makes the lime putty/aggregate mix smoother and easier to work) and eventually realized that it actually reacted chemically with the lime to make a hydraulic cement. The secret is the silicates and aluminates in the ash. Clay also contains these compounds, that's why it's a raw ingredient in Portland cement. The difference is, we burn it much hotter than they did. The clinker we depend on for fast setting times, was garbage to the Romans. The chemistry is not good for durability.

Modern concrete can carry much greater loads.

@@larrybarnes3920 😂

Perhaps modern concrete can carry much greater loads than way back then, but not many people need it to do that, so why can’t we just get an option to buy the same stuff the Romans put out ?

The main difference between roman concrete and modern is the larger chunks of quicklime they mixed in, this made the concrete "self healing" and therefore can last longer. Today you can buy concrete that has a similar composition as roman concrete but better in every way, the only problem is that it is waaay more expensive... and most chooses to not sell it. In fact most buildings today are calculated to last just 50-100 years and therefore expensive concrete is not needed. If you want to see the best concrete we can create today look att the concrete in nuclear waste storage bunkers, that concrete often uses iron ore as aggregate and is calculated to last 1000+ years :)

💪

So did Bill.

Probably the same fella who worked out you could get milk from a cow.

Lime mortar had been used for thousands of years, but takes weeks to cure. The Romans sometimes experimented with additives to modify the workability of the liquid mix. They added pozzolan (volcanic ash, which makes the mix very smoothly workable) and discovered that it actually reacted with the lime to make a hydraulic cement.

Once humans had fire, I think all it took was for someone to put a limestone rock or maybe some sea shells in the fire (calcium). When it gets hot enough, the rock breaks down to a powder. When that powder gets wet again it will solidify. This is basic lime. Cement is a relatively new variation that adds sand (silica) to change the hardness of the finished product.

@@steveburian6880 Yeah so cement is actually also a development instead of an invention 🤔 But it's true, I think a lot of stuff has just been stumbled upon.

Cylindrical

Omg

How do people never hear the pronunciation of such common words? Drives me crazy.

Spelling police

@@mimusic1853 No, the AI bot speech police.

@@petermoto409 People shouldn't use words they can't pronounce.