Want to add a second story to your library of obscure knowledge? Watch this video that reveals how the maximum occupancy of a building is calculated: th-cam.com/video/mcVyC-1DfTg/w-d-xo.html
Today I Found Out , Fun fact....concrete and other masonry building systems are a huge factor in climate change. Next is our black roads. These products absorbs heat during the day and dissipate it at night raising night temperatures. This has a huge impact on overall temperatures.
Bonus Fact 4 - The Hoover Dam in Nevada was the first dam constructed using the mass concrete placement technique. This technique was devised because it was estimated that, using the normal method, it would take 100 years for the concrete to cool. The new technique--embedding a series of one-inch pipes into the blocks and circulating ice water through them--allowed the blocks to cool rapidly and uniformly.The system cooled the concrete blocks in less than two months and opened the door for the construction of the Grand Coulee Dam in Washington state.
@Jay Jammer if you paid attention to the video you would have heard him say that concrete is a mixture of cement, water, and aggregate. Cement is just cement. So no, concrete cannot be in cement because cement is 1 of the ingredients needed to make concrete. The final product cannot be a part of one of the ingredients.
@@Sciguy95 So if concrete cannot be in cement, then does that mean cake cannot be in flour? So flour is just flour? P.S. Does that also mean bread cannot be in yeast?
Asking what the difference is between cement and concrete is a bit like asking what the difference is between cake mix and a finished cake. One is the mix and the other is the finished product.
The easiest way I find to explain the difference is to compare yeast with bread. Yeast is the vital ingredient used in most breads, but you wouldn't want to eat a loaf of yeast.
There were several unusual uses for reinforced concrete structures during World War Two. Check out documentaries on The Atlantic Wall, U-Boat Pens in France, V-2 Rocket Bunker, Hitler's Bunker's, The Maginot Line, and Mulberry Harbour [D-Day]. Many of these structures still stand today in various states of repair or decay.
The manufacture of cement is actually a huge carbon emitter. Ironically, this carbon is usually offset by the fuel used by the kilns, used tires. As tires are a large percentage natural rubber, this offsets its carbon footprint while iliminating a bulky waste product.
Another interesting thing about concrete is that after the "initial set" when the concrete first hardens, it then begins to bleed water and then as the curing process develops it requires extra water to be applied over the first couple of days to help the concrete attain maximum strength. Maximum strength in most concrete is attained after 27 days.
Cement is glue. If you look on many different types of "glues" in the store you will find a lot of them are also labeled as "cement" Concrete is a mixture of glue (water activated {processed rock based} ... Portland cement or similar) , sand and small rocks. Mortar (used in gluing bricks, cinder blocks or large stones together) is a mixture of glue (usually Portland cement) and sand.
Loved it! I love your channels (both TopTenz and Today I found out). Could you possibly make a video one day about tar? I never fully understood how tar is made, where it is used and whether it is still used for constructing roads. ...Or is nowadays only concrete used for roads? Thanks so much in advance.
Ray Giordano Yes, especially by the peasant farmers displaced from their ancestral homes, archeologists who would forever lose access to unexplored potential dig sites, and environmentalists concerned about ecosystems being flooded. Bonus fact: when the Aswan Dam was proposed in Egypt, the ancient temples and monuments were moved to higher ground before construction, in order to preserve them for the future.
+Allan Richardson I have read about a lot of major problems the Aswan Dam has created, but at least burying the past isn't one of them. Sadly, the ruins of Egypt's long gone greatness is about all Egypt has left, so it was a pragmatic thing to do.
The difference between concrete and cement is something you just learned today? LOL Here's a clue: a concrete truck (aka a cement mixer) is a large egg-shaped vehicle rotatung along its long axis to keep the concrete mixture of (usually) Portland cement,water,aggregate,additives to control set from setting up (during which the *cement* component would crystallize around the aggregate). A cement truck (the real thing) is a cigar-shaped vehicle with V's (funnels, usually three of them) on the underside to drain the powder for delivery to a silo. The truck could be used for any powder, and ones like it often are. Just today? You should get out more
Agnė Rinkevičiūtė - Yeah, he said "dry" many times. That's wrong. Concrete hardens because it goes through a chemical curing process. Frankly, concrete shouldn't "dry" during this process, because it needs the water to complete the curing process so that it can achieve it's fully hardened state.
KOakaKO When I learned about concrete in my materials class, the word was SET. Concrete should be poured as dry as feasible, but as soon as it sets, it should be kept wet for as long as you are permitted, as it continues to strengthen, although with diminishing returns. We also discussed the way gravel, sand, OPC, and water are proportioned to make concrete.
I’m surprised that one of your “bonus facts” wasn’t that until the last couple of years we know what the formula was for Roman concrete and that in terms of durability and resistance to seawater the ancient material is actually vastly superior to the modern-day formulation of Portland concrete. Anyway, really enjoy your videos, they're always informative and full of interesting facts.
+Martin Rayner "Roman concrete" Erik von Daniken wrote that the extra durability of Roman concrete was inexplicable and therefore...extraterrestrial in origin. The term "blockhead" seems appropriate.
In my limited experience (I live in southern CA), there are three relevant terms in common usage: Cement, mortar and concrete. Cement is variously used to refer to the material that serves as a binder and also to mortar and concrete although this usage is informal and imprecise. Mortar contains only sand and cement while concrete contains cement, sand and gravel. I have never heard concrete referred to as mortar or visa versa.
Good job though mortar can also have lime added to it. I think it's to cut the strength because you don't want mortar joints being too strong and not giving a little as the building settles.
The claim is made (2:50) that concrete is 'environmentally friendly' - a point which is not that self-evidently obvious. In actuality, because of the tremendous amount of energy required to bake limestone into lime (requires a temperature greater than 1,800 degrees F), and as this energy comes from fossil-fuels, Portland cement manufacture makes a significant contribution to greenhouse gas emissions. However, there is a recent report in Nature Geoscience (1) that long-term up to about 40% of the generated CO2 may be taken back up by the cement through carbonization upon exposure to air - more than had been observed in the past. One of the problems with that is the 'long-term' part. Roman concrete structures are still with us after, in some cases, more than 2,000 years - whilst many consider the service life expectancy of modern steel-reinforced concrete structures to be around 50 years. There are several reasons for this ranging from the composition of the cement, to the method of building (the Romans tamped the concrete), and to the fact that the Romans did not use reinforced concrete - which, in the long run, breaks down concrete from within by differential expansion between the concrete and the reinforcing material, though tensile strength is increased in the short-term. Concrete is a fascinating substance, wonderful to work with, but does have its failings. === (1) www.nature.com/ngeo/journal/v9/n12/full/ngeo2840.html Paywall :( But the abstract is free.
I work restore old buildings and you would be surprised how quickly carbon build up takes to the point of being rather noticable once you clean it. This isn't going to be a problem for ancient structures since they don't have a million cars driving all around them everyday. You hit the nail on the head about the key to their longevity is they didn't use steel in their structures.
When i was a kid, we could go to Central Hardware for bags of play sand for the sandbox in the backyard.. Similar bags with different colors had cement, concrete, and other powdered building materials in them.
for those wondering how deep the sidewalk would be, it's .3025 feet, or approximately 1/3 of a meter: 24,874(equator in miles)*5280=131,334,720 feet 131,334,720*8=1,050,677,760 feet^2 9,000,000 meters^3=317,832,000.5 feet^3 317,832,000.5/1,050,677,760=.3025 feet which, due to slight rounding was most likely originally set as 1/3 of a meter
Bonus fact, I can't believe they missed. The most amazing thing about concrete is that it has nearly the same expansion rate as steel, thus making modern structures possible.
Yep and have the same subtraction rate as well. Zero. Well that's not true cause when concrete degrades it disintegrates where steel expands by rusting then disintegrates. I restore old buildings and have to measure both as a part of my job and neither have ever expanded unless severe rusting had taken place. In those cases we clean all the rust off and then you obviously have less steel sometimes to the point of nothing. If you are talking about thermal expansion they aren't that close as concretes expansion is next to nothing. Now being that one of the secondary jobs of the concrete is to protect the steel that helps to minimize any significant thermal expansion
Good simple facts about the difference between cement and concrete. As simple as it seems the more that is understood, the more uses it will find. Remember OPC comes in at least 5 flavors and that is just Portland. Its all in the MIX!
I hope lots of people watch this video. Since my dad works in the concrete industry I never made the mistake of interchanging them but it annoys me when people do
I know it isn't considered a historical record, but the Bible (OT) is older than Rome and it refers to Limes prior to its own history in the construction of the Tower of Babel (traditionally dated to 4400 yrs ago or 2400 BCE)
jsbrads1 the Bible as a whole wasn't written til a few centuries after the common era, and any sections predating C.E. were individual stories or myths added to the Bible when it was created, as noted with the Jewish texts, many of their stories were taken from Babylonian texts and mythos, and adapted to or straight copied into Jewish faith.
NinjaTyler LoL, no Historian believes that. The gospels... Sure, they were formally canonized by the church hundreds of years after they were written, after CE, except for Paul which came later. The accepted time may vary, but the first five books are attributed to Ezra, tho I can't imagine anyone believing he wasn't basing his work on earlier writing. Roughly 500 years before the CE. The reference in the beginning of Genesis to the Tower of Babel, long before Ezra, referred to cement.
jsbrads1 no, all historians would not agree with you, the Bible is well known to any historian to be a collection of stolen mythos from Hebrew texts and other ancient cultures, many Roman texts flat out state why Christians were called Christians, and it's nothing to do with Christ fyi, and like someone pointed out, parts of the Bible clearly show that the subjects covered occurred hundreds of years before they were written in the bible, there's tons of historical inaccuracies throughout its pages.
Being from Cement, Ok, it's nice to be able to explain to people the difference. People always call the town Concrete instead of Cement to be funny. Thanks!
Concrete's environmental friendliness means it's not toxic to the environment. It takes a lot of energy to make and transport cement. The limestone for cement is usually mined from the landscape. It can't be recycled easily. It's better than steel but worse than wood.
Something else that people get confused by is Pre-Cast Concrete compared with In-Situ Concrete, and Pre-Tensioned Concrete compared with Post Tensioned Concrete.
2:40 ... Environmental friendliness? Some people disagree. In 2012, "the cement industry used ... one-quarter of one percent of total U.S. energy ... [and] it is the most energy-intensive of all manufacturing industries." It takes a lot of heat to make Portland Cement.
Another great video up until the block breaking bit. Honestly don't you all know it's a trick? Ask the guy to do it without all the little slivers of wood between the block. To all those knuckleheads that think breaking blocks or snapping balsa wood with the grain just remember that blocks don't hit back and I'm pretty sure my sister could to the same as you.
I like the dense subject, it reminds me of most favored personal qualities... My teachers always told be I wouldnt get any smarter so I turned to self reflection.
It does also come in white and it can be coloured with various additives. Cracking can be minimised with the use of reinforcing mesh or bar or fibres [steel or fibreglass, even carbon fibre].
Correct, the only way to truly minimise the cracking would be to use special techniques during the curing process, and they are reserved for special High Value projects, not home projects.
Fun fact....concrete and other masonry building systems are a huge factor in climate change. Next is our black roads. These products absorbs heat during the day and dissipate it at night raising night temperatures. This has a huge impact on overall temperatures.
obpinkslip TH-cam changed the algorithm a couple months ago drastically changing the types of videos that show up in the recommended feed. This channel is positively effected by that change.
I learnt this one 30 years ago at TAFE ( Trade |School) cement is an ingredient concrete is sand, steel and cement . Calling concrete, cement is like calling a cake an egg cause it's in a cake.
Simon, you say dry but it doesn't dry, it sets, then cures. Said it a lot actually. And bonus fact: gruesome, didn't a bunch of workers fall into the concrete and stay when they built the Brooklyn bridge? or a dam...
Concrete does not "dry". It "cures" through a process called "hydration" whereby water is bound up chemically with the cement. This is why concrete is so fire resistant. Hydration can only be reversed with heat, and it requires an enormous amount of energy to do so. But at least you got the difference between "concrete" and "cement" right, lol....
Another bonus fact: The Three Gorges dam is so large that it actually measurably changed the speed of Earth's rotation, making our days a tiny bit shorter.
Adam Hosein Concrete is concrete and cement is the powder that is added to the aggregate that glues it all together through chemical reaction when proper amount of water is added.
Why at .59 are you talking about cement but focusing in on a picture of plaster? Then at 1:24 you're talking about cement but zooming in on a picture of concrete? It suggests you don't really know what you're talking about, just reading facts from places like wiki pages and knitting them together with arbitrary images?
The production of cement begins with the heating of limestone which is the corpses of marine life from millions of years back ,the re-introduction into the atmosphere creates carbon dioxide (Co2 ) which is irresponsible for global warming , so to say it is environmentally friendly is a bit of a stretch .
So you can think of cement as a glue of sorts and concrete as a lego block made of a bunch of rocks and sand glued together using the cement as the glue.
I heard that the Romans had this special kind of cement. And for obvious reason people want to know how it was made. Because it is so strong it is still around to this day. I also heard that all traces of the recipes have been lost when that fool, set Roam on fire.
Ive heard that the reason, or at least one reason, roman concrete was so good is the kind of sand they preferred. Apparently they used volcanic sand wherever it was available, which has particles with sharper points and edges that give a stronger structure when its set.
![[Full] 4 ต่อ 4 Celebrity EP.920 | 3 พ.ย. 67 | one31](http://i.ytimg.com/vi/KwiW2M_kAg4/mqdefault.jpg)
Want to add a second story to your library of obscure knowledge? Watch this video that reveals how the maximum occupancy of a building is calculated:
th-cam.com/video/mcVyC-1DfTg/w-d-xo.html
Today I Found Out , Fun fact....concrete and other masonry building systems are a huge factor in climate change. Next is our black roads. These products absorbs heat during the day and dissipate it at night raising night temperatures. This has a huge impact on overall temperatures.
@@markschiavone8003 grew
But... what about SEement? That’s what we use in Texas! 😂 🤠.
Bonus Fact 4 - The Hoover Dam in Nevada was the first dam constructed using the mass concrete placement technique. This technique was devised because it was estimated that, using the normal method, it would take 100 years for the concrete to cool. The new technique--embedding a series of one-inch pipes into the blocks and circulating ice water through them--allowed the blocks to cool rapidly and uniformly.The system cooled the concrete blocks in less than two months and opened the door for the construction of the Grand Coulee Dam in Washington state.
Cement is to concrete, as flour is to a cake.
@Jay Jammer if you paid attention to the video you would have heard him say that concrete is a mixture of cement, water, and aggregate. Cement is just cement. So no, concrete cannot be in cement because cement is 1 of the ingredients needed to make concrete. The final product cannot be a part of one of the ingredients.
Thank you. That was helpful.
@@Sciguy95 So if concrete cannot be in cement, then does that mean cake cannot be in flour? So flour is just flour? P.S. Does that also mean bread cannot be in yeast?
That's correct. You can't pass bread off as yeast. I tried and my girlfriend didn't fall for it.
3:05 apparently we also need a video explaining the difference between elbows and hands.
the chemistry involving it is surprisingly complex.
Asking what the difference is between cement and concrete is a bit like asking what the difference is between cake mix and a finished cake. One is the mix and the other is the finished product.
The easiest way I find to explain the difference is to compare yeast with bread. Yeast is the vital ingredient used in most breads, but you wouldn't want to eat a loaf of yeast.
Vegemite is a Yeast by-product with a little bit of modification and a lot of marketing. ;)
A loaf of yeast. Try saying that 3 times fast!
3:40 "Grand Coolie Dam has enough concrete to make an 8 foot wide sidewalk around the equator of the Earth" But how thick is that sidewalk?
Tony Samson How do you come up with that number?
Jeffrey314159 do the calculation
Since the only references to a minimum recommended sidewalk thickness I can find is 4 inches / 100 mm, I wouldn't trust it over the Pacific.
the grand coolie is a sight to behold though... until that dumbass light show starts playing, that's when I leave
Great video - good detail and really well put together!
Moses Stevens Thanks Moses!
There were several unusual uses for reinforced concrete structures during World War Two. Check out documentaries on The Atlantic Wall, U-Boat Pens in France, V-2 Rocket Bunker, Hitler's Bunker's, The Maginot Line, and Mulberry Harbour [D-Day].
Many of these structures still stand today in various states of repair or decay.
The manufacture of cement is actually a huge carbon emitter. Ironically, this carbon is usually offset by the fuel used by the kilns, used tires. As tires are a large percentage natural rubber, this offsets its carbon footprint while iliminating a bulky waste product.
Another interesting thing about concrete is that after the "initial set" when the concrete first hardens, it then begins to bleed water and then as the curing process develops it requires extra water to be applied over the first couple of days to help the concrete attain maximum strength. Maximum strength in most concrete is attained after 27 days.
Cement is glue. If you look on many different types of "glues" in the store you will find a lot of them are also labeled as "cement"
Concrete is a mixture of glue (water activated {processed rock based} ... Portland cement or similar) , sand and small rocks.
Mortar (used in gluing bricks, cinder blocks or large stones together) is a mixture of glue (usually Portland cement) and sand.
Loved it! I love your channels (both TopTenz and Today I found out). Could you possibly make a video one day about tar? I never fully understood how tar is made, where it is used and whether it is still used for constructing roads. ...Or is nowadays only concrete used for roads? Thanks so much in advance.
When I heard the bonus facts about dams, I instinctively uttered "Damn...".
I am pretty sure "Damn" was used often in response to the fiasco the Three River Gorge dam created in China.
Ray Giordano Yes, especially by the peasant farmers displaced from their ancestral homes, archeologists who would forever lose access to unexplored potential dig sites, and environmentalists concerned about ecosystems being flooded.
Bonus fact: when the Aswan Dam was proposed in Egypt, the ancient temples and monuments were moved to higher ground before construction, in order to preserve them for the future.
+Allan Richardson
I have read about a lot of major problems the Aswan Dam has created, but at least burying the past isn't one of them. Sadly, the ruins of Egypt's long gone greatness is about all Egypt has left, so it was a pragmatic thing to do.
Concrete facts. Cemented into the brain
I’m glad you guys always give us concrete evidence.
Underrated ✌🏻
The difference between concrete and cement is something you just learned today? LOL Here's a clue: a concrete truck (aka a cement mixer) is a large egg-shaped vehicle rotatung along its long axis to keep the concrete mixture of (usually) Portland cement,water,aggregate,additives to control set from setting up (during which the *cement* component would crystallize around the aggregate). A cement truck (the real thing) is a cigar-shaped vehicle with V's (funnels, usually three of them) on the underside to drain the powder for delivery to a silo. The truck could be used for any powder, and ones like it often are.
Just today? You should get out more
cure not harden
I think you mean "cure" not "dry".
He didn't say dry?
Agnė Rinkevičiūtė
- Yeah, he said "dry" many times. That's wrong. Concrete hardens because it goes through a chemical curing process. Frankly, concrete shouldn't "dry" during this process, because it needs the water to complete the curing process so that it can achieve it's fully hardened state.
KOakaKO
Okay, thanks.
KOakaKO When I learned about concrete in my materials class, the word was SET. Concrete should be poured as dry as feasible, but as soon as it sets, it should be kept wet for as long as you are permitted, as it continues to strengthen, although with diminishing returns. We also discussed the way gravel, sand, OPC, and water are proportioned to make concrete.
I’m surprised that one of your “bonus facts” wasn’t that until the last couple of years we know what the formula was for Roman concrete and that in terms of durability and resistance to seawater the ancient material is actually vastly superior to the modern-day formulation of Portland concrete. Anyway, really enjoy your videos, they're always informative and full of interesting facts.
***** Wow, today I found out... ;)
+Martin Rayner "Roman concrete"
Erik von Daniken wrote that the extra durability of Roman concrete was inexplicable and therefore...extraterrestrial in origin. The term "blockhead" seems appropriate.
+Stefan Travis Von D is also a convicted felon for fraud.
Martin Rayner I was actually the wondering the same thing
Martin Rayner v,Ch cbv of
In my limited experience (I live in southern CA), there are three relevant terms in common usage: Cement, mortar and concrete. Cement is variously used to refer to the material that serves as a binder and also to mortar and concrete although this usage is informal and imprecise. Mortar contains only sand and cement while concrete contains cement, sand and gravel. I have never heard concrete referred to as mortar or visa versa.
Good job though mortar can also have lime added to it. I think it's to cut the strength because you don't want mortar joints being too strong and not giving a little as the building settles.
The claim is made (2:50) that concrete is 'environmentally friendly' - a point which is not that self-evidently obvious.
In actuality, because of the tremendous amount of energy required to bake limestone into lime (requires a temperature greater than 1,800 degrees F), and as this energy comes from fossil-fuels, Portland cement manufacture makes a significant contribution to greenhouse gas emissions.
However, there is a recent report in Nature Geoscience (1) that long-term up to about 40% of the generated CO2 may be taken back up by the cement through carbonization upon exposure to air - more than had been observed in the past.
One of the problems with that is the 'long-term' part.
Roman concrete structures are still with us after, in some cases, more than 2,000 years - whilst many consider the service life expectancy of modern steel-reinforced concrete structures to be around 50 years.
There are several reasons for this ranging from the composition of the cement, to the method of building (the Romans tamped the concrete), and to the fact that the Romans did not use reinforced concrete - which, in the long run, breaks down concrete from within by differential expansion between the concrete and the reinforcing material, though tensile strength is increased in the short-term.
Concrete is a fascinating substance, wonderful to work with, but does have its failings.
===
(1) www.nature.com/ngeo/journal/v9/n12/full/ngeo2840.html
Paywall :( But the abstract is free.
I work restore old buildings and you would be surprised how quickly carbon build up takes to the point of being rather noticable once you clean it. This isn't going to be a problem for ancient structures since they don't have a million cars driving all around them everyday. You hit the nail on the head about the key to their longevity is they didn't use steel in their structures.
Nice info all in one place thanks
When i was a kid, we could go to Central Hardware for bags of play sand for the sandbox in the backyard.. Similar bags with different colors had cement, concrete, and other powdered building materials in them.
Me: Lets watch a few of these videos before I go to bed...... It is now 3:20 am and I have an 8 am class. great.
Very informative video. Clear and to the point. Thank you very much. I learned a lot from the vide o.
the background music is very calming
for those wondering how deep the sidewalk would be, it's .3025 feet, or approximately 1/3 of a meter:
24,874(equator in miles)*5280=131,334,720 feet
131,334,720*8=1,050,677,760 feet^2
9,000,000 meters^3=317,832,000.5 feet^3
317,832,000.5/1,050,677,760=.3025 feet which, due to slight rounding was most likely originally set as 1/3 of a meter
Michael Hertzler how does 0.3 feet equal one third of a meter?
Hey Simon, awesome job on the vids. Was wondering if you did (could do) a Today I Found Out about why bugs are attracted to light?
Bonus fact, I can't believe they missed.
The most amazing thing about concrete is that it has nearly the same expansion rate as steel, thus making modern structures possible.
Yep and have the same subtraction rate as well. Zero. Well that's not true cause when concrete degrades it disintegrates where steel expands by rusting then disintegrates. I restore old buildings and have to measure both as a part of my job and neither have ever expanded unless severe rusting had taken place. In those cases we clean all the rust off and then you obviously have less steel sometimes to the point of nothing. If you are talking about thermal expansion they aren't that close as concretes expansion is next to nothing. Now being that one of the secondary jobs of the concrete is to protect the steel that helps to minimize any significant thermal expansion
Did not know I was clicking into a TIFO video.
Simon's voice is a brand. Also his beard. His beard is a brand, too.
Good simple facts about the difference between cement and concrete. As simple as it seems the more that is understood, the more uses it will find. Remember OPC comes in at least 5 flavors and that is just Portland. Its all in the MIX!
Thank you. I always thought concrete and cement were the same thing.
I hope lots of people watch this video. Since my dad works in the concrete industry I never made the mistake of interchanging them but it annoys me when people do
Great information
Guys, girls I love all of your stuff...cool to see some early stuff
Nothing except the bonus facts surprised me.
What a very Concrete Cementing video.
I watched for thirty seconds got my answer now I'm leaving, thank you for being direct.
I know it isn't considered a historical record, but the Bible (OT) is older than Rome and it refers to Limes prior to its own history in the construction of the Tower of Babel (traditionally dated to 4400 yrs ago or 2400 BCE)
Zero Seeker my point was it was written before Rome... Forget for a moment what it was referring to for a second.
Zero Seeker two different times.
Writing of the bible is older than Macedonia and Rome.
The 4400 was the internal reference.
jsbrads1 the Bible as a whole wasn't written til a few centuries after the common era, and any sections predating C.E. were individual stories or myths added to the Bible when it was created, as noted with the Jewish texts, many of their stories were taken from Babylonian texts and mythos, and adapted to or straight copied into Jewish faith.
NinjaTyler LoL, no Historian believes that. The gospels... Sure, they were formally canonized by the church hundreds of years after they were written, after CE, except for Paul which came later.
The accepted time may vary, but the first five books are attributed to Ezra, tho I can't imagine anyone believing he wasn't basing his work on earlier writing. Roughly 500 years before the CE. The reference in the beginning of Genesis to the Tower of Babel, long before Ezra, referred to cement.
jsbrads1 no, all historians would not agree with you, the Bible is well known to any historian to be a collection of stolen mythos from Hebrew texts and other ancient cultures, many Roman texts flat out state why Christians were called Christians, and it's nothing to do with Christ fyi, and like someone pointed out, parts of the Bible clearly show that the subjects covered occurred hundreds of years before they were written in the bible, there's tons of historical inaccuracies throughout its pages.
For further information about concrete and its uses I suggest that you visit your local Cement and Concrete Association website.
That sounds like a fun place indeed!
Also a fantastic website concrete.com/ full of useful information and ideas about concrete hours of endless fun............
Well this is interesting to know as I had always used cement and concrete interchangeably. Looks like I was incorrect.
As a fifth generation Mason, I congratulate you on your research. Excellent video.
Yeah, this was fun.
I lay blosks and trust me. Breaking them with your hands is no super power, especially since they're made flawed
Windows CE. Windows ME. Windows NT. Proudly presenting Windows CEMENT.
Being from Cement, Ok, it's nice to be able to explain to people the difference. People always call the town Concrete instead of Cement to be funny. Thanks!
always wondered what was the difference! 🚙
Concrete's environmental friendliness means it's not toxic to the environment. It takes a lot of energy to make and transport cement. The limestone for cement is usually mined from the landscape. It can't be recycled easily. It's better than steel but worse than wood.
Great lecture, thank you. More grease to your elbow. I learned from your great video.
Something else that people get confused by is Pre-Cast Concrete compared with In-Situ Concrete, and Pre-Tensioned
Concrete compared with Post Tensioned Concrete.
Mark Fryer Yep, "Concrete" is a variable product. To say something is made of "concrete" is like saying something is made of "steel".
I'd like to see a video on how martial artists actually break cement blocks and if they do anything to make it easier.
2:40 ... Environmental friendliness? Some people disagree. In 2012, "the cement industry used ... one-quarter of one percent of total U.S. energy ... [and] it is the most energy-intensive of all manufacturing industries." It takes a lot of heat to make Portland Cement.
When making concrete I like to use peanuts instead of gravel -- also, curry gives it a nice dark yellow colour.
Another great video up until the block breaking bit. Honestly don't you all know it's a trick? Ask the guy to do it without all the little slivers of wood between the block. To all those knuckleheads that think breaking blocks or snapping balsa wood with the grain just remember that blocks don't hit back and I'm pretty sure my sister could to the same as you.
I like the dense subject, it reminds me of most favored personal qualities...
My teachers always told be I wouldnt get any smarter so I turned to self reflection.
Well done. Very informative, but let's not forget the two laws of cement. It is grey, and it WILL crack.
It does also come in white and it can be coloured with various additives. Cracking can be minimised with the use of reinforcing mesh or bar or fibres [steel or fibreglass, even carbon fibre].
minimized not eliminate
Correct, the only way to truly minimise the cracking would be to use special techniques during the curing process, and they are reserved for special High Value projects, not home projects.
Just throw heshin over it and when it up while curing ;)
Fun fact....concrete and other masonry building systems are a huge factor in climate change. Next is our black roads. These products absorbs heat during the day and dissipate it at night raising night temperatures. This has a huge impact on overall temperatures.
Nice!
bonus fact 4, the Chinese damn took so much steel to construct that it raised the price of steel globally.
So it really just comes down to a matter of semantics.
DukeOfMarshall What isn't semantics?
maths
DukeOfMarshall not at all!
DukeOfMarshall no! Did you even watch the video?
Cool, I already knew the difference.
It's doesn't "dry and harden"
it "cures and then dries"
Gotta get the nomenclature correct with these facts videos mate.
So it doesn't harden?
@@bryanbutchmartin9260 It hardens when it cures.
150k subs in 30 days. up 300%. What did you guys do? Magic.
obpinkslip TH-cam changed the algorithm a couple months ago drastically changing the types of videos that show up in the recommended feed. This channel is positively effected by that change.
I learnt this one 30 years ago at TAFE ( Trade |School) cement is an ingredient concrete is sand, steel and cement . Calling concrete, cement is like calling a cake an egg cause it's in a cake.
have you ever done any videos on hempcrete
have you done dirt vs. soil yet?
Want to have some fun? Take a shot every time he says concrete and a double when he says cement.
death by alcohol isn't fun... well at least not for your loved one's!
How does cement not harden in transport, storage etc? Is there a time limit on transportation before it hardens?
@0.22 you state it's allowed to dry. concrete dose not dry. water is apart of the chemical reaction rather it "sets".
Simon, you say dry but it doesn't dry, it sets, then cures. Said it a lot actually. And bonus fact: gruesome, didn't a bunch of workers fall into the concrete and stay when they built the Brooklyn bridge? or a dam...
Fun fact, cutting tools are made of iron or tungsten cement
You forgot to mentpon the Itaipu dam between Payaguay Brazil and Argentina that used 12.3 million cubicmeters of concrete to build the dam.
The pictures of Concrete Masonry Units made me think of cinderblocks. you should do a video on the.
Concrete does not "dry". It "cures" through a process called "hydration" whereby water is bound up chemically with the cement. This is why concrete is so fire resistant. Hydration can only be reversed with heat, and it requires an enormous amount of energy to do so.
But at least you got the difference between "concrete" and "cement" right, lol....
Another bonus fact: The Three Gorges dam is so large that it actually measurably changed the speed of Earth's rotation, making our days a tiny bit shorter.
Concrete is like a filler while cement is like a brick glue.
Adam Hosein Actually 'brick glue' is a sand & lime mortar ?
Adam Hosein Concrete is concrete and cement is the powder that is added to the aggregate that glues it all together through chemical reaction when proper amount of water is added.
As an engineer, It's a pet peeve when people refer to concrete as cement.
I have seen a work truck advertising as "the best cement contractor".
Never hire someone who calls himself a cement contractor.
making the raw material for cement releases a lot of carbon dioxide, though some is reabsorbed as it cures in concrete.
and the trees can breathe easier for it
Hi why do we use aggregates on Concrete and what other use
How thick is the sidewalk around the earth equator? We know it's 8 foot wide.
It should be 4" but a lot of sidewalks are 3.5" because of the use of 2x4's (a 2x4 is really 1.5 x 3.5 inches)
Did anyone else think of that guy from insane pools when Simon said Portland cement?
Wait wait wait, an 8 foot wide sidewalk around the equator of the earth!?!?! Bonus Shock more like it!! Jaw dropped to-the-floor!
I'm down with OPC, you know me!
Yes
some say the concrete in the Hoover Dam is not fully cured yet, is this True?
Why at .59 are you talking about cement but focusing in on a picture of plaster? Then at 1:24 you're talking about cement but zooming in on a picture of concrete? It suggests you don't really know what you're talking about, just reading facts from places like wiki pages and knitting them together with arbitrary images?
Steve Gould entertainment.
Because probably make it
Good job you didn't put him off going to make 1000's of other entertaining and educational videos with condescending comment.
The production of cement begins with the heating of limestone which is the corpses of marine life from millions of years back ,the re-introduction into the atmosphere creates carbon dioxide (Co2 ) which is irresponsible for global warming , so to say it is environmentally friendly is a bit of a stretch .
didnt know there was a difference, shit
0:40 Don't tell me, the Chinese invented it first
It wasn't.
So you can think of cement as a glue of sorts and concrete as a lego block made of a bunch of rocks and sand glued together using the cement as the glue.
🤔why does this voice sound so familiar? Does the speaker do biography videos too?
were these simons first videos?
the thumbnail reminds me of bob the builder
I heard that the Romans had this special kind of cement. And for obvious reason people want to know how it was made. Because it is so strong it is still around to this day. I also heard that all traces of the recipes have been lost when that fool, set Roam on fire.
Ive heard that the reason, or at least one reason, roman concrete was so good is the kind of sand they preferred. Apparently they used volcanic sand wherever it was available, which has particles with sharper points and edges that give a stronger structure when its set.
consider all your videos liked
Fact I didn’t need of the day
Concrete heats up too and will set in water too
Ya down with OPC? Yah you know me!
What do they say about the acropolis where the parthenon is?
Cement is a powder that you mix with water and sand to make concrete. People often call concrete cement. They are wrong.
The question is answered by 0:34