Why Concrete Needs Reinforcement

[@fizzie6902]

Ah yes... That 3am content.

[@Stinkycillygrwm]

Ha

[@GRITBONE]

12:56 am content for me

[@tacccobell]

3:44am on the dot

[@3point1.2]

I was watching other videos on this channel at 3am, it's now 5:52am and I've arrived

[@kalnoa8452]

Ah yes... That KZbin rabbit hole content

[@JayV688]

So the next time someone says they have concrete evidence against you, you just give them some stress

[@macforme]

and tension!

[@wasilqayyum]

JoulSA But what if they reinforce it?

[@macforme]

@@wasilqayyum If that injures anyone they will put you behind rebars.... sorry...I'll show myself out.

[@eric0125]

@@macforme nice one lol

[@mansour522]

Tension to be accurate. Compression is still a stress but concrete handle it very well

[@lilbuddyjoker]

"Stress in this case doesn't mean anxiety or existential dread" damn dude you really know your audience hahahaha

[@nootaboot7042]

Jorge Uresti *crying*

[@pablomarcosreis838]

Hahahahahahahaha

[@antonioaguirre3989]

Lmao

[@johnlemon273]

that hit close to home😢

[@6shadowflame]

Want to like, but 666 is just too perfect

[@Kdot19]

Another interesting thing to note, you CAN have too much rebar in a beam. Since steel is much stronger than concrete, having too much steel in the tension zone will cause the concrete to fail in compression before the reinforced concrete can fail in tension. Since concrete is a brittle material, this turns the failure mode BACK into a brittle failure, rather than a ductile failure. So the goal with designing a reinforced concrete beam is to have enough steel to have the strength required, but not too much to the point where failure becomes brittle again. Strength AND ductility are both very important

[@whatthe9256]

Correct. In other words, having too much steel would result to the concrete structure instantly collapsing without prior warning which would result to hundreds or thousands of death in contrast to having the concrete fail first before the steel which will alarm the people in the vicinity to evacuate before the inevitable collapse since the steel would be able to hold the crumbling concrete first before collapsing

[@nickmeale1957]

Would having four steel rods in his structure be overkill?

[@Kdot19]

@@nickmeale1957 hard for me to say I don’t have much experience actually designing to know off the top of my head lol. I just had some structural design classes. Also rebar comes in a lot of different sizes so you’d wanna specify the total area of steel in a cross section rather than the number of bars

[@nickmeale1957]

@@Kdot19 Interesting

[@whatthe9256]

@@nickmeale1957 Four is the minimum for any main structural support like column or beam but for lintel beams and stiffiner columns that support the walls you can have two depending on how high the wall is

[@Leonidas1262]

I work in flatbed oversize. Hauling rebar safely, in a timely manner. Is something I take much pride in my work ethic. Great video man.

[@GoAndLive]

Wishing you good fortune. An actual essential worker😎🤙

[@neoc03]

You guys are invaluable. I always try to help truckers merge, it's the least I can do. So few people respect or understand how vital they are to everything running smoothly.

[@outlawedTV88]

Cool. Fun fact. Did you know they found rebars in the Egyptian statues and buildings over 2000 y old?! Yup, scratch your head. So the question is: IS our history fake or did they have some advanced tech back than?

[@_Xds_]

@@outlawedTV88 where u here tht my guy? Onion News network?

[@markpenny523]

Dkzbin.info/www/bejne/qKiXq2CoiNyBoLs, it is a video I found online talking about the origins of COVID, and that the video talks about the west is responsible for COVID, I don’t know if it is true but this video was 10 years ago, and it predicted many things that have become true since then. I love America, but I am with humanity if this is true, if you guys can share this it would be amazinesesd

[@alexharkler]

As a special inspector and field technician, part of my job includes making these concrete samples and breaking them later in our lab. I think you did a great job covering this subject. The only thing that annoyed me was that you dropped the 20lb weight into the bucket. It may have held a bit more if you would have gently placed that weight in the bucket or had kept tossing small objects in there.

[@person_perhaps]

But would he get his hand out in time?

[@alexharkler]

@@person_perhaps Sometimes sacrifices must be made in the name of science.

[@ozdagap1809]

@@alexharkler 😂ah. Yes. Sometimes people have to have their bodies dissected while awake in order to further science

[@nothinginparticular6419]

@@ozdagap1809 that's a thing it's how the medical field has become so amazing. Anesthesia and sleeping drugs weren't always present. Also if this was already discovered there's no reason to sacrifice your hand lol

[@stevenelliott8977]

It also should have been a test to rip that concrete in half, not tear a hook out of it.

[@bisonwesker]

Recommended: Video games Video games Video games Video games Why concrete needs reinforcement Video games

[@yabovax7403]

Jaja

[@farizanroslan]

You made the right choice.

[@yabovax7403]

@@pierreo33 😯

[@Robert_D_Mercer]

It's because of gamers like me who care about the world. ;) (I was forced to do this irl, my brain man....)

[@Kaheedran]

Don't forget somolian pirate videos

[@makim-k5850]

As an Ironworker who installs rebar and post tension cables as well as precast prestressed concrete this was a very informative and interesting video. You did a great job of explaining everything in layman terms for people who don't do this every day. Great video!

[@helmgimble1258]

Man, this reminds me of when I studied civil engineering at uni. I dropped out to eventually become a software developer. Thanks for reminding me why

[@danielalvarezleon1004]

lmao

[@ngynnhuvy2850]

Dropping out must feel free and horrifying at the same time. I'm so hesitant.

[@scout1710]

lol

[@joshuaarnold1895]

Why did you stop studying civil engineering?

[@jincongdai2982]

@@joshuaarnold1895 i think civil engineering is one of the hardest engineering majors

[@roxxarus1809]

I'm not a mechanic. I'm not an engineer. I'm not a construction worker. I've never watched a single video about construction or engineering in the past month. This has been recommended in my feed for whatever reason. I love this video and the concept of the channel.

[@mahuk.]

This might be just another comment on youtube, but I really wanted to say thank you for making these videos. Since I discovered this channel I've been really enjoying watching them. Wish you were my teacher in college, but here you're teaching with ease the basics about some complicated topics to thousands or millions of people through the internet. Thank you.

[@erick289777]

In 2016, an earthquake hit Ecuador and was catastrophic to the infrastructure of the coastal side of the country. The reason being was that to save costs, many buildings were built using seawater for the concrete mix. The salt found in the mix weakened the steel reinforcement significantly, so when the stress came, it just gave in. I think this is something worth mentioning. (this theory might be incorrect? I heard it in the news - I am not a professional in the subject).

[@henrylam92]

Salt, moisture, and oxygen can corrode metal much worse than rust. So you are correct

[@lanes8237]

Chlorides cause corrosion in concrete as well as steel. Bad news.

[@pixeldimond]

What an epic failure. To think that they would cheap out on something like that is mind boggling.

[@gamelard1963]

i work in scaffolding and all the material that is exposed to ocean air rust really really bad that it makes you think they were sitting there for decades being unused

[@JeremyRobertWalker]

basalt rebar fixes that

[@harunsuaidi7349]

Remember, just because you're strong doesn't mean you don't need support from others.

[@jonathanpruegert3007]

Deep

[@fernmccreary2729]

Harun Suaidi whoa dude u blew my mind

[@lewisjones284]

Always lift with a spotter

[@-mae-5524]

Harun Suaidi DID YOU JUST

[@wanted247ha8]

A.K.A the Lebron James effect.

[@jordan3119]

I worked as a CMT and we would stress cables post pour and no one ever explained to me the purpose beyond “the boss said so” thanks for elaborating!

[@Fwago1]

That always drives me crazy. I do a much better job knowing WHY I need to do something instead of just being told "because I said so".

[@raven4k998]

well the boss says so to maximize the strength of what ever your building with that reinforced concrete

[@calebfisher7067]

@@raven4k998 Thanks, we also watched the video.

[@3vanguardofthephoenix335]

@@raven4k998 shh guys he works for the boss! Look busy!!! And never question the boss man's authority 🤐 Loool

[@fartonaut2291]

2:47 You got really lucky to get a frame while the concrete was cracking.

[@ndimumnini5894]

or he has a really good high speed camera?

[@doctorlarry2273]

video is good at that.

[@MrKinir]

"video is good at that." A conventional camera is very bad at that. Unless you're extremely lucky.

[@CitroenDS23]

The cheap way is to genlock 3 or so cameras with a phase offset and then use camera output containing the moment wanted. Maybe he had more than one beam? But it isn't that hard at all.

[@louf7178]

@@CitroenDS23 "Instant" would have been a better word choice than "moment" in this topic, LOL. i.e. bending moment.

[@orbtastic]

30+ years ago at College we had a year long module on "materials". Part of that was making concrete cubes and testing them. One of the lads on the course worked for a concrete company and brought in some extra strong reinforced cubes and the teacher went ape when they didn't shatter in his testing machine.

[@NitroAuto77]

What did it test out at ? MPa?

[@jetyoun7215]

Algorithm out here trying to make people experts on the Miami Condo collapse.

[@stephennorcross]

Word

[@Cameron.storch]

😂I just watched a video about that whole thing

[@culiasnla]

ikr, those engineers knew fuck all about what they were doing, they shoulda watched this video.

[@edmundnlemadim]

Lol I was about to mention the same thing 😅

[@bishop51807]

I came to the channel after the I-40 bridge failure. I guess the country is literally falling apart.

[@connorh5335]

You do a good job at pulling young peoples attention towards civil engineering, I bet at least one person has been influenced to go into that field by you

[@sarowie]

even if people just appreciate the wonder of modern infrastructure and the time scales it spans, he has done something awesome. Infrastructure is such an unloved child of politics - the decisions span multiple election, if not generation and people take it for granted.

[@takingbacktheplanet]

Around 30, haven't decided what I wanted to do yet because so many domains interest me and I have not had pressure to make that kind of choice yet, but I love every video this guy has made to date basically and his rather casual and intimate approach to the subject (the topics of which would actually be quite dire in terms of consequences if there would ever be, uhm, catastrophic failure I guess is the term? ;) Always looking forward to next one!

[@sasori144]

Connor Hyland he's very informative and opens up alot of doors cool channel

[@TheMultipower47]

I don't have much interest in civil or structural engineering but I still thoroughly enjoyed this

[@TegustaVon]

I'm late, but I do love the thought of it. However, I've already made up my mind into being a mechanical engineer.

[@AndrewNowacki]

“You shouldn’t make a rope out of concrete.” Well said.

[@highlypolishedturd7947]

Crap! going back to the drawing board...

[@LOLLYPOPPE]

Rope should only be made from rope

[@lunchpunchcrab32]

Note: *make rope out of rope*

[@LOLmusics]

Anyone know where I can buy a concrete rope ?

[@markfairbanks3533]

If i ever am to be hung, that will be my request...a concrete rope!

[@zeagias]

Ive been in construction for about 3 years now as a laborer and this explains so much. Thanks!

[@dominikschaefer7626]

Material stress is not unrelated to anxiety - at least when having to do the calculations in college

[@Anonymouspock]

Dominik Schaefer Tension problems really stress me out, although they aren't a lot of work. Despite this, somehow they still use a lot of energy due to very low efficiency in doing them.

[@GoErikTheRed]

I feel ya

[@13lade23]

Dominik Schaefer deflection equations, stress transformations are a pain in the ass.

[@antoniohugo289]

Same :-)

[@PKPJayhawk04]

Cold sweats and flashbacks to structural analysis.

[@mnomic8371]

Nice video. Also to add: Concrete beams that pass over columns need to have more steel at the top due to tensile stresses occuring over the column. It is also important to note that steel structures alone are not fire resistant (they deform with heat etc) so the concrete cover acts as fire proofing. However, not having sufficient concrete cover over the steel can affect this and can also cause “concrete spalling” if moisture penetrates cracks in the concrete and cause corrosion. Concrete spalling is when the concrete face is pushed off due to expanding steel as a result of excessive corrosion/rusting. There is constant research going on now to find ways to protect the steel with additives mixed into the concrete during casting.

[@Joelsmediahere]

Wait what? Is this how that building on 9/11 fell apart ? Without warning?? 😭

[@Stephanie-gm6ue]

@@Joelsmediahere no what the heck? it fell because a planed flew right into it.

[@Joelsmediahere]

@@Stephanie-gm6ue oh well I was referring to building 7 😅

[@Stephanie-gm6ue]

@@Joelsmediahere huh?

[@mnomic8371]

The problem with the world trade center design was the outer wall panels and the floor joists. Once the central columns were compromised, the building lost its strength in the impact area and as the outer wall panels moved outwards the floor joists, that were supported by the wall panels, fell onto the level below. The design was to allow maximum open-plan office space without having columns everywhere. But the terrorists knew exactly where to hit to destroy the main central column.

[@poissonpuerile8897]

Never in my life did I think concrete would be fascinating! Well done. Very impressed by pre-stressing - what a brilliant innovation!

[@JRjr3]

This is amazing, I work security for active construction zones. Most of which are apartment complexes, and sometimes I work one week and see some areas with cracks and do not enter signs, then within a couple the area is all new concrete and looks like it was redone and not just filled in. All my life I thought that cracks were just going to happen no matter what and all that mattered was the wood structure deeper in the concrete.

[@OregonDARRYL]

Think of concrete as the opposite of rebar. Concrete is for compression - not tension, because it pulls apart easily. Rebar is weak in compression, and will bend easily, but great for tension, because you can pull on it with enormous force. Combined together... using the best traits of concrete and steel wire or bar - and you have a great combo for structures.

[@yavuzyurur7129]

The exact same lesson my late father taught me .

[@isoaxe]

No so. Rebar (and structural steel in general) is very strong in compression too. Don't mistake the fact that (relatively) thin bar of steel bends easily with having low compressive resistance. The reason it bends easily is because it has a low second moment of area, to which deflection is proportional.

[@Postermaestro]

@@yavuzyurur7129 where did your early father go?

[@kosskrit]

@@isoaxe Theoretically yes, but practically thin rods are prone to losing stability when you compress them.

[@Dad_Lyon]

@@isoaxe To put it simply, it's slender 😀 I'm an aero engineer so no concrete experience. Under compression, does the rebar buckle? I don't know if that'd be realistic because the concrete should fail before you get high strain/deflection, but if the concrete could deflect I'd imagine it provides some lateral stability to the rebar.

[@nurakmalsharizal979]

Hi just wanted to drop a comment saying i watched this video last night to understand more about reinforced concrete for my exam the next day..and guess what..i could answer a question by remembering this video and its content..thank god i stumbled upon your video...keep it going and thank you so much

[@mikesergo4471]

Great 👍👍

[@anisizzati6492]

Never thought I would find you here HAHAHA

[@operatorjewski9450]

Same

[@mansour522]

There is nothing very special in this video tbh that just reinforced concrete 101 first week

[@ibeenlucid7627]

Mansour mohamad doesn’t mean that it is not helpful 🤷‍♂️🤷‍♂️

[@Moneymyke357]

The algorithm has struck again. RIP to those poor people in Miami

[@coredetta]

What happened?

[@morenofrank08]

@@coredetta building Collapsed and some people are missing under the rubble but an engineer called it 3 years prior but no one listened

[@Bidens_Diaper]

@@coredetta Damn yo, living under a rock

[@TurboTroller]

Damn I was wondering why this was recommended, but that makes sense. RIP

[@LILDroidDEX]

Lol yep algorithm is working lol. This is good information too.

[@T8ersalad]

I am eternally grateful.. I can intellectually capture any lesson naturally I have learned. I used to crave dense dives, but now I’ve fluently conceived anything anyone could possibly openly discuss… (it feels like). I have reached a point I get frustrated if it’s not a really really soft spirit explaining the lesson to me. Your demeanor is an anxiety relief as I refine my knowledge base to a head banging wall level. Lolol. If the lesson isn’t GRACEFULLY carried… I’m thinking the script writer does not passionately understand.. and move on. Understanding something and therefor teaching it is sufficient.. understanding something from Passionately discovering it is the essential teachers we need. The bees knees.

[@funa8843]

People joke about the “3am content” a lot but it’s nice to see how many of us are simply curious about the world around them. In an age of alternate facts and outright science denialism. Curiosity is more important than ever.

[@superchase4106]

Don’t think anyone is denying consistently provable “concrete breaking easier than with rebar inside it”.

[@ZethoYT]

@@superchase4106 you'd be surprised with people

[@christopherquintero6910]

@@ZethoYT yeah 🤣

[@captainhindsight8604]

what about when the scientist themselves disagree, or use correlation and causation, something we were always told to was wrong before. I’m curious af about that

[@accelmemory]

@@superchase4106 The flat earthers haven't advanced to that point yet

[@TooMuchThought]

*Just finishes making concrete rope. “Well fuck, now ya tell me!”

[@Life_is_Awesome_Civil]

Great work

[@Sangprabu2045]

ooke

[@alimirzatv2293]

i subscribed 2 you, now u hav 1.8 million subs nice!

[@crow5228]

nm

[@MrBlackHawk888]

A concrete comment. +1

[@drv3973]

I have zero interest in construction. zero. but i saw this vid a few weeks ago (youtube algo) and can't get it out of my head. there is something powerful about a great explanation. it really stays with you. great video.

[@glenchaos9]

I do pool construction, it’s actually pretty crazy how we bend and shape the rebar to reinforce the pool before putting concrete

[@bjarkimar4110]

We use it here for decades in every type of construction ,iceland

[@DoseOfJapan]

Just 10m. Super easy

[@glenchaos9]

@@DoseOfJapan 10m? lol, well what we use 3/8 #3 & half inch #4 for pools, half inch for the beam but yes it’s easy if you know what you’re doing lol

[@ACTUALLYRICH]

I work in civil engineering inspection and testing, and it always amazes me finding out what I’m testing (if I haven’t sampled myself personally from site) for what project to get the bigger picture of the scope of work.

[@thegman4759]

Yeah I guess it's cool till you work with it everyday then it'd just a pain in the ass I build foundations and I hate rebar absolutely hate it

[@stevenhenry4814]

Hey, I have just started watching your videos. I am a building supervisor and commercial diver and I have really found your videos informative and easy to watch. You have done such a good job of covering important aspects while not overloading with information given the relatively short time you have to explain a topic. Awesome job

[@isaacalvarado123]

I've been a concrete finisher for two years now and this was very interesting to learn. Thanks.

[@shen1801]

I have never worked with conrete in my life, and it was still interesting to learn!

[@ajtg3807]

@@shen1801 if you do WEAR GLOVES! Over the years concreting has made my skin terrible

[@CErra310]

should I be concerned?

[@florimondhusquinet]

At 4:36 you expressed very simply what I had in mind each time I was thinking about the way rebars actually work. I thought I just didn't understand. But my intuition was right. Now I understand the world a bit better and that cured my depressive feelings for a minute. Thank you.

[@sophiamelfi6305]

Hey in not an engineering major or really care about the subject, but I love the way you explain these topics. It's super engaging and I actually find myself looking forward to learning and seeing what you have to say. Thanks Grady!

[@Nafeeshomedesigner]

yeah right sophia

[@Nafeeshomedesigner]

Sophia give me your social contact

[@Nafeeshomedesigner]

Tell me sophia

[@syedibspk8418]

Can you upload a detail leacture on foundation plan for steel structure

[@hypercuriosity9828]

CIVIL WORLD bloody pervert

[@drawengrave01]

Well done. Reminded me of the Hyatt Regency walkway collapse even though concrete was not at fault. As a city inspector/engineer I had to closely watch contractors who often didn't follow design specs, cut corners and lackadaisical engineers who verbally authorized changes without engineering reviews and change orders. Getting my life threatened by a unscrupulous contractor isn't fun.

[@treeguyable]

Isn't it great, when some inadequate coward tries to feel superior, by threatening, lying. They are everywhere.

[@wadesworld6250]

The Florida International University bridge collapse was an exact demonstration of these forces and failures.

[@Eugenepanels]

Threat is taking it way to far that sob needs to be taught a lesson as to what happens if u do that

[@whatyousaidbud]

@@Eugenepanels the trouble is, the person handing out threats is the one who access to large holes that get filled with concrete, if you catch my drift.

[@Auxified]

This stuff is really cool. I wish I learned about this type of thing when I was younger. Getting to see what everything around us is made out of makes the use cases of applied math and science very apparent.

[@lumchunglasangtam5609]

I’m currently in my last year civil engineering degree in uni and these videos are so refreshing … it’s like a revision for me and these are the really basic concepts to always remember

[@enb3810]

I'm almost certain that these videos are aimed at a young audience but every video I see is captivating. Lucky I don't have to do the hard number crunching that really makes things tick.

[@fprintf]

I've shared these with my daughter who is a Sophomore of Civil Engineering and she finds them very interesting and helpful despite their rather basic subject. It is a nice way of understanding what makes CivE and materials science useful.

[@nc3826]

Y u dont think can teach an old dog new tricks?

[@Aaron.Reichert]

"You shouldn't make rope out of concrete" I rarely feel comfortable promising to take a piece of advice but this one seems easy enough to keep.

[@kainebishop3970]

@San the Man Seeing this is like finding an easter egg in a video game

[@user_0231-j]

@San the Man lmao

[@MrBlackHawk888]

Such a verbose expression instead of "Thanks for advice". I will save it for later use.

[@TheMrByrom]

I teach a beginning Engineering Principles class. My students have been studying this exact topic for the last week. Tomorrow they are going to make small plaster beams that will span 1 foot. They will be able to add sand, rocks, fiber, glue, cable, wire, fiberglass grid, etc. They even have the choice between plaster of Paris or dental plaster. There will be 2 winners, the best strength to weight ratio and the best strength to cost ratio. I plan to use your videos for next year, keep up the good work. I will post a video of some of the student designs soon. Also, if you are ever in the SLC area, I would love to have you as a guest speaker.

[@baileetalbot9376]

Love this comment

[@sankalp7135]

That’s so nice.

[@TheMrByrom]

Here is the video of my students breaking beams. kzbin.info/www/bejne/fpTLlKKYg8Zrd6s It is a long video due to lots of beams. You don't have to watch all of it to see how different mixes and reinforcement can change how strong it is and how it breaks. The record was 705 pounds.

[@markm_koko]

its fun to watch, as an Electrical Engineer, this helps me quite a bit on understanding the basic theory on re-bars..

[@MikeRoberts-OmegaEng]

What happens over time with rebar rusting and "vanishing" inside the concrete. I know today rebar comes with a plastic shroud to keep moisture out, but the nature of manufacturing causes nicks in the plastic. A fascinating picture I saw was in road construction from the 60' compared to days of road work; the amount of rebar in a raised road support than in now is 90% more. I do enjoy your channel. Thank you for producing them!

[@Kdot19]

Rebar generally doesn’t rust inside of concrete because there isn’t oxygen available for it to oxidize. Actually, the reason rebar usually is embedded about an inch inside a beam rather than it being on the surface, where it would provide the most benefit in terms of reinforcement, is because that 1 inch of concrete is meant to protect the rebar from weathering. Like he mentioned in the video, the concrete has to crack for the rebar to have any effect, so when designing a beam like the one shown, the structural engineer actually ignores any capacity that 1” concrete cover may provide and uses the capacity of only the steel by itself, so it is actually purely to protect from things like weathering and fire.

[@CasanovaBrown57]

@@Kdot19 I'm glad to see that there's people still out there that know about concrete.

[@Kdot19]

@@CasanovaBrown57 I had two classes on concrete and steel design this stuff was like carved into my brain lol

[@gojtron]

kzbin.info/www/bejne/hn2pYmt-bq96ftU

[@grahamhannah2108]

Steel can rust from the old practice of adding calcium to the concrete to cure the concrete faster. The calcium eats away at the metal causing failure of the concrete.

[@HJCF0520]

Congratulations on 500,000 subscribers! Your videos are awesome!

[@gorillaau]

HJCF0520 On to the next 500,000.

[@radiobehemoth9334]

As you can see, this man is clearly an Engineer. He solves practical problems.

[@kamikaze3124]

I dont see him using gun tho

[@radiobehemoth9334]

@@kamikaze3124 This problem doesn't NEED more gun tho...

[@kamikaze3124]

@@radiobehemoth9334 there is no thing as enough gun

[@CyberHo4X]

* me Proud as an Engineer“

[@radiobehemoth9334]

@@kamikaze3124 That is true.

[@vKross]

Working as an Industrial Climber that helps out building my bosses "concrete bunker" as we like to call it has me really interested in these types of videos often times, I knew pretty much everything but since I am German I find it fascinating learning these things in two languages.

[@JLFamilySong]

Grady, thanks so much for all the prep work you do for your videos. I have learned so much! When I was a child, my dad decided to add on to our home. He decided to use cinder block instead of reinforced poured concrete for our basement walls. (Rebar = reinforcing bar) Unfortunately, I spent the rest of my childhood bailing our basement out every time it sprinkled outside. The water sprayed through the cinder block like hundreds of shower heads. When it rained, my older brothers would run around with a pencil and circle all the streams to later go back and smear on this water proofing paste used specifically to waterproof cinder block. If you're wondering, no it didn't work.

[@SkyTowerKurogane]

Interesting. I don't know why YT recommended this for me, but it's quite interesting. The practical demonstrations are great. Great video.

[@Meg_A_Byte]

I would love to see more types of concrete in the next videos, like mixed with resin, fiberglass and others. Thank you for this series!

[@rpgcraftsman520]

I knew rebar was a reinforcement for concrete, but I never knew how or why it worked. This was very informative; thank you!

[@ashallama223]

Nope. How come a long rebar which sags under its own weight be a any help for reinforcement

[@rpgcraftsman520]

@@ashallama223 Did you even watch the video?

[@ashallama223]

I can make video that can convince anything. This is a question to ask anyway.

[@LillyP-xs5qe]

My dad is a civil engineer, so I'm aware how much more you can talk on concrete! So many different recipes! And add ons for the concert! Also how important it is to use vibrators while casting!

[@Maric18]

to enjoy yourself while you are waiting ( ͡° ͜ʖ ͡°)

[@LillyP-xs5qe]

Maric well I wouldn't use the concrete vibrators for that... Unless you enjoy internal bleeding and being ripped to tiny pieces, then go ahead!

[@bmwdaywhatyouwant7679]

Police officer: Help! I need reinforcement! Steel manufacturers: hold my beer.

[@ThamizhanDaa1]

Hold my *rebar

[@punker4Real]

Chinese rebar is like using play doh

[@jimsvideos7201]

I have money for a shirt that says "You shouldn't make rope out of concrete".

[@MikeHarris1984]

I second that! This shirt must be made!

[@simoncollins2574]

There are so many good quotes from his videos my favorite is ""engineers generally try and avoid building civil structures out of liquids." From the quicksand video. I would love either of these on a shirt

[@OmarBKar-sw1ij]

Or "every time you say cement instead of concrete an engineer's calculator dies" this one in my favorite

[@OmarBKar-sw1ij]

I'd pay 100 bucks for it

[@computer5272]

"a length of strong cord made by twisting together strands of natural fibers such as hemp or artificial fibers such as polypropylene." You're correct but for the wrong reasons. Way to go.

[@catto_]

I do not know why this showed up on my recommended, I've never watched something even remote to this, but thank you, it was very interesting

[@jimibones178]

The most interesting thing I learned about concrete when I got into carpentry is that concrete and steel expand and contract at the exact same rate, which is why steel reinforced concrete doesn't immediately crack. I never thought about it before they taught it in my apprenticeship but I found that interesting for some reason

[@jimibones178]

@retsaM innavoiG well it's true buddy. That's why bridges and skyscrapers and shit aren't full of cracks. Roads are because the ground heaves but that's a different cause

[@SmartiesSniffer]

I just got done learning how and where to space rebar in reinforced concrete in my theory of structures classes next semester. I love this so much

[@Mrhvac]

I love KZbin and am thankful for people like yourself that make these videos. I didn't realize how complicated concrete was.

[@youtubealgorithm6188]

This is one the rare videos where I don't even think of skipping. The narration, the illustrations, etc. are perfect (at least for me).

[@solarkadakiadam]

I had almost no interest in these subjects before watching the video, but this was a great explanation and introduction, i learned a lot and loved your video, great content man, you're great!

[@oscarhernandez8836]

I'm civil engineer and still enjoying this video.

[@saicharangarrepalli9590]

What do you mean "still enjoying it"? You would enjoy it more if you are a civil engineer.

[@anilkumarsharma1205]

are you able to produce the energy from atmospheric pressure by using a large scale android's barometer means big modal of android barometer ,say a kilometres diagonal large area could produce 27kilowatt energy per day

[@liammiddleton3064]

Hey what titanium rebarb in sted of steel?

[@yusufy4743]

Yeah.. You should

[@brokenwave6125]

That's like saying, I'm a chef but I still like watching the Food Network... Yeah...obviously.

[@FrozenHare]

You're like the awesome engineer who's amazing videos would draw us all in during science, someone get this man a movie deal asap.

[@kimpavfx]

4 years later, this comes up in my recommended. i understood everything you said, surprisingly. nice video

[@monkeyboy018]

Dude I love your videos. I get an education, and I get to see cool stuff. You're the best

[@__1201]

I was always curious how rebar functions in concrete. I knew it allowed the concreted to hold more weight, but wasn't sure how it did so scientifically. This video perfectly explains that.

[@TheLancebringer]

Threaded rod is a terrible idea to reference Re-Bar. Re-Bar is made from a mild, low carbon, high ductility steel. This allows much more 'strength' from the metal, it has a longer durability for external and internal forces. Meaning it can actually stretch before breaking. Threaded rod is made from a myriad of materials, with my uses finding them in the higher carbon range. Higher carbon content allows the threads to retain their shape and not stretch as much with normal torque levels usually required of them. Much like bolts, which are mostly higher carbon. Not only that but the sharp ridges formed or cut for the threads provide a very nice shear point allowing threaded rod to break with relatively very little force, Re-Bar, not so much. Your video still shows the relation and still works well enough for most purposes. But you did ask for what we thought, and this is my thought.

[@Bhatt_Hole]

Rebar nerd!

[@doctorlarry2273]

Actually threaded rod is quite appropriate for a demonstration. Even the smallest size rebar (#3) is way too big for the size "beam" he was testing. I used a number of rebar models when I did a lot of model slab tests 50 years ago ranging from twisted strands of tie wire to threaded rods.

[@ender10man]

Are you going let DoctorLarry show you off ?

[@stevethea5250]

Is just makes the concrete more flexible rightttt

[@stuartluig2911]

Settle down yall, settle down

[@LiveLaughLuke]

For 20 times in a row I’ve been suggested this. Now I finally watch it.

[@rudellius]

I've already watched it and it just showed up on my front page again

[@ryangaffneysguitarphilosop732]

You've answered questions about concrete I didn't even know I had. Great video.

[@cakeload3488]

In the video, I noticed something to reduce the shear effect that can occur on old wooden post supports bearing some weight, that may also experience shear from wind force. Recently, I fixed 1m weather-treated iron stakes to a piece of aged 2.5m lumber posts sitting in a 30cm bed of quick set concrete. I realised the job would be stronger if I had used a treated wire mesh wrapped around the concrete to bind it and improve the overall strength. Thanks for the prompt.

[@originalbluebuddha]

Great. NOW I see this. I just spent a fortune on concrete rope I no longer trust.

[@PipeScholar]

:'D

[@mmastroleo]

I'm having a new house built and they are doing post tension foundation and now I understand what that means. I appreciate the quick informative video.

[@cyanwolf264]

we all know why we are here together

[@AD_RC]

why? this just recommended for me

[@reedman0780]

Im here to understand why the hell I have to draw rebar in autocad

[@rowen616]

I sure as hell don't... What the fuck happened in Miami?

[@CoolNinja925]

KZbin's dark algorithm 🤣😐.

[@GMarieBehindTheMask]

🤓

[@gregfarley5737]

I really appreciate your knowledge and that you are willing to share with those of use that don't have an engineering background. Thanks.

[@gus1955]

This answered a lot of the questions I had about concrete. I still have a ton more! Thank you so very much.

[@erics.2362]

Ask your questions, I should be able to answer most of them.

[@janisbanis6882]

@@erics.2362 can you sink in concrete

[@urm786]

Showing the sponsor ad at the end is what got you a new subscriber

[@leokimvideo]

Can you do a video on why Chocolate needs sugar

[@anon6413]

2 mAke IT tASTe NiCe, dERP

[@breakinglegsandbreakinghea3167]

Don't know why this was in my recommended. Still, i enjoyed

[@nijohn12]

Zack is NOT gsneric...

[@anonimous2451]

Cawsa boss, dem der jeaneric wite boyz needz ta be scool'd ya know, so dey be more better smarts den us ol' po niggazzzzz

[@adamsmith-bg5wq]

Pretty sure google's algorithm throws a wild card in there occasionally.

[@breakinglegsandbreakinghea3167]

@@adamsmith-bg5wq Then element of surprise. Watching Marvel videos and all of sudden "CONCRETE!!!" "this is what you want to watch"

[@wentaoqiu4072]

4:18, this guy even made special effect as the concrete lost balance, amazing dedication..

[@fuzzybanana0123]

I wake up and randomly think to myself how much rebar matters in a structure....and I watch this video and learn more in 8 minutes than I have the last 10 years lmao. Who knew this could be so interesting? Great vid my man.

[@1whamster]

Back in 1981 my uncle and his two pals were travelling to do a gig when they were killed instantly less than a mile from home, the car they were traveling in hit a 1930's reinforced concrete lamppost column, the car was a big Morris Oxford, disintegrated on impact, splitting in two, and the engine was catapulted sixty feet down the road, the column hardly had a scratch on it, the cops said the lamppost was designed to carry a ten foot long, cast iron arm and tram wires, and were capable of ruining a truck never mind a car, some years later they were replacing them with modern galvanised steel ones and it took about an hour jack of hammering to break them at their base, I noticed they were hollow about 30inch in circumference and about 3inch thick concrete with about eight 10 mm rebars and wire skeleton and about thirty feet in length

[@theXEN0KID]

Sorry to hear about your uncle. But as an example, this really puts the capabilities of reinforced concrete into perspective. I'd have never thought about how outrageously strong a concrete lamppost is. Makes you wonder why they would ever switch to galvanised steel posts when the concrete could do so well. I'd wager it had a few more decades left in it at the time they were taking it out

[@ethanepps5500]

theXEN0KID a steel post would give way to a car instead of a concrete barrier which would be rigid. Car manufacturers build cars these days to absorb impact better by allowing deformation of the bumpers and other parts of the car to lessen abrupt impact. Same concept...hope that makes sense.

[@pk-zi7lm]

_that run-on sentence tho_

[@epiccat9740]

@@pk-zi7lm Ikr almost died reading this as there was no time to breath.

[@theXEN0KID]

Ethan Epps That actually makes a lot of sense. Bound to rack up way more in repair costs though I’d imagine

[@ancbi]

it's nice to see you have very concrete plans for the next vids.

[@Vendetta162X]

Being under Stress and Tension: Not exclusive to humans

[@jean-christophel.7745]

Sorry, i don't speak english very well, it's why i will follow in french. C'est bien la première fois de ma vie, à 51 ans, que je trouve une vidéo intéressante d'ingénierie sur le béton ! J'ai appris les notions relatives à la flexion : l'extension, la compression et le cisaillement comme décrit en début de vidéo, mais pour des poutres métallique. Alors ça m'intéresse beaucoup aussi pour le béton. Super vidéo, je like et je m'abonne 👍

[@prayushrajbhandari6799]

You should do a video on High Strength Concrete and Self Healing Concrete.

[@John_Montgomery]

Love the videos, I am an electrical contractor and have always been fascinated by concrete but never understood any of it... It's interesting to see and learn. There is an awful lot of conversation right now about the FIU bridge failure if you wanted to talk about that I would love to listen

[@HAMZAALI-oj5zj]

I am a university student and I gained very important information with your videos

[@mikesergo4471]

Me 2 loved your way deliverying the concept very well 👍👍👍

[@siddhantnandi4077]

University in Pakistan hahaha

[@ShamanSZN]

This has been on my recommended for a week. You convinced me, I'm watching.

[@michael-gary-scott]

Congratulations on 500k!

[@X3WorkshopDesigns]

Thanks for sharing your wisdom. This really will help me when I make my concrete countertops.

[@nc3826]

How did it turn out? BTW this was great post but there r a lot more relevant posts for ppl that want to make a concrete countertops.

[@ofmiat4693]

Could you go into fiber reenforced concrete, and its uses? As well as best fibers to use?

[@randommcranderson5155]

This is a pretty basic video and fiber reinforced concrete is a pretty niche subject.

[@tomc.5704]

But it sounds like an interesting topic, so i'd love to hear more about it

[@jrmdawg]

Polypropylene fibers are used in concrete mainly to reduce shrinkage in the specimen. As the concrete cures over time it shrinks slightly mostly due to the hydrating chemical reactions and evaporation. This leads to small cracks that are bad for the concrete's durability. The fibers are almost always used with conventional steel reinforcement as well and I've mostly seen them used on foundations and elevated slabs. There's also steel fiber reinforcement which serves a similar purpose but provides even more crack and shrinkage control. Hope this was helpful for you or someone else reading!

[@ofmiat4693]

More than I knew 10 seconds ago, I had heard some about it, but much on what or why. So yes, a bit clearer that beffore. Thanks for chiming in.

[@trevorh6438]

Burlapcrete and Concrete Canvas too.

[@spacefalcon6900]

Your voice is soooooo soothing and relaxing, it's like i am learning while relaxing

[@randy7068]

As a redimix driver I would add 3 points. 1. There is a difference between concrete and cement. Concrete has aggregate or stone in it, while cement does not. 2. The more water you add, the more it will decrease the strength of the concrete. #. There is also fiber mesh you can add to concrete (made from fiberglass strands) that will improve it's strength.

[@damienbaker3118]

No cement is the powder used to make concrete

[@m-h1217]

@@damienbaker3118 Both are powder, and there are 2 types. Cement and concrete. So, no.

[@rosscarroll6735]

@@m-h1217 Nah dude, Damien is right. Cement is one of the primary ingredients of concrete.

[@m-h1217]

​@@rosscarroll6735 Yes, but concrete is still in a powder form. When you buy it you get it in a bag just like cement. Cement is not only an ingredient to make concrete, it can be used by itself. So saying "No cement is the powder used to make concrete" implies that it isn't used like the original comment states. For real I've been around and worked with that stuff since I was a kid.

[@JC-nu5zt]

@@m-h1217 when you buy a bag of “concrete” you are actually buying all the materials needed to make concrete, minus water. It is not concrete until it is mixed. Until it is mixed with water all you have is a bag of cement powder, crushed stone and sand. Yes you can use cement on its own. Doing so usually makes it easier to have a nice glossy smooth finish, but it is not considered to be construction grade unless it is mixed into concrete. So yes cement is the powder that is used to make concrete.

[@piccoloatburgerking]

This video is certified Florida classic.

[@severeoneblunt]

Florida hood classic

[@JaCKal_0000]

Hahahahahaha fuck sake

[@kittyNya38]

I feel I shouldn’t be laughing at this.

[@JaxMerrick]

@@severeoneblunt "You can't call it a Hood Classic! That's reserved for very specific things!" HeavenlyFather, aka Lord Headass

[@tanzkoyolforever7743]

Tinvaak hi dovahzul, wunduniik?

[@boriscrisp518]

bizarre mix of really dull and really interesting

[@PracticalEngineeringChannel]

One of the highest compliments I've received

[@taba1950]

Engineering is dull by nature

[@stelms10]

Practical Engineering That's how i describe civil engineering

[@lostindixie]

Good engineering is usually dull, it's the screw-ups that are interesting.

[@Volvith]

Welcome to mechanical engineering. ;) (EDIT: And structural engineering. They kinda cover the same subjects from time to time. :3)

[@norukamo]

I was wondering why there needed to be metal in concrete and I finally know why! Thank you so much!!!

[@kmntal]

please talk about Basalt and fiberglass Rebar

[@jackielinde7568]

Can you cover shapes used in concrete forms (like bridge beams) and how they are used to make the structure withstand heavy loads and the management of forces on it?

[@garret1930]

Jack Linde mostly for beams it's about increasing the inertia and keeping the stress concentrations relatively consistent, which is why we have I beams all over the place. They provide the largest inertia with the lowest material

[@MikhaelAhava]

This has been in my watch later for over a year lol.

[@MakeTheVid61]

MiguelPpM lmfao mine too! I’m watching this off my watch later finally haha

[@noahhayes7041]

Well i just now got it so. Twins

[@blizzard2508-k7n]

We're you surprised at what videos younger you wanted to watch?

[@frogskills8477]

I don't know why KZbin recommended this, but now I have new knowledge about concrete.