You can't end this series until you design a reinforced concrete beam your press can't break. (and you can lift yourself!) :)
@sydmushas5 жыл бұрын
Agreed
@taragwendolyn5 жыл бұрын
Lol... good luck? While you're at it, see if he can design a carbon nanotube space elevator that won't collapse under its own weight?
@sopgenorth5 жыл бұрын
I'd suspect that one of the existing designs could beat his press just by letting the concrete cure for a month or longer.
@extreamemineing5 жыл бұрын
hit the gym
@dav1dsm1th5 жыл бұрын
Or a pasta machine.
@SithLord20665 жыл бұрын
I was taught that there are 2 kinds of concrete in the world. Concrete that has cracked, and concrete that's gonna crack.
@TheLe0165 жыл бұрын
I hate when people say the same about motorcyclists and crashing
@fsmoura5 жыл бұрын
i hate when my motorcycle crashes
@truckertech92725 жыл бұрын
Stucco also fits here.
@Nosirrbro5 жыл бұрын
@Rick Sanchez If you're talking about the incan stoneworking, as far as I am aware those are solid stones that were put together quite masterfully. Something roman is probably an exception though.
@iankrom5105 жыл бұрын
@Rossirbro I remember my Grandpa telling me about visiting a Mayan pyramid that had concrete at the top, he said the concrete looked absolutely pristine. According to the Mayan guide the pyramid was capped with concrete when it was built. I know it’s Mayan not Inca but it is still pretty cool!
@fsmoura5 жыл бұрын
This topic is *solid,* but very *stressful.*
@bonanzatime5 жыл бұрын
fsmoura just run some rebar through your ears. ..should lighten the load.😅😅 .....oops, I mean 'tension'.😂😂😂
@TheLe0165 жыл бұрын
Normally I'm stressed anyway, but for sum reason, I would like to know Mohr
@munishkalia9225 жыл бұрын
I just love the way you present. Incredible you are. Steel structures or Trusses or Frames could be interesting topics.
@knightshousegames5 жыл бұрын
There were some tense moments, but as hard as it may be, in the end you won't crack, you'll just come through stronger.
@binupdhungana38894 жыл бұрын
the comment is cemented into my memory now...
@user-zp5vt1tu6b5 жыл бұрын
Be careful using the vibrator. If you vibrate it too much the rocks in the mix sink to the bottom.
@andreaaristokrates95165 жыл бұрын
That'd make an interesting demo...
@quintinbassett94675 жыл бұрын
Two two three Five five six It’s very possible that Grady doesn’t have a lot of experience with that specific piece of technology and Kevin does. Someone who helps builds these structures would be undeniably more of an expert on the equipment they use everyday. There’s no guarantee that Kevin is the expert on this specific thing but there is no need to be an ass about it. It’s just some friendly advice for Grady.
@TheComedyButchers5 жыл бұрын
Two two three Five five six Maybe Grady hasn’t used a vibrator before?
@MntRprznt5 жыл бұрын
Yeah, being an engineer doesnt mean that you know how to use all machines - engineers can take tips as well.@Two two three Five five six
@fsmoura5 жыл бұрын
_"Be careful using the vibrator"_ thats what she said
@Wordsnwood5 жыл бұрын
Hey Grady! ideas for more: - how the angle and length of off ramps and curves on highways is determined. (When I was at Thinkercon I found that the off-ramps were short and curved very tightly and I wondered if it was because they do not have snow/winter like we do up here in Ontario) - More on city/urban infrastructure (ie: how blue is added to green lights because of red/green colour blindness?) horizontal vs vertical stop lights. - canals? - why cloverleafs on highways are a terrible design and why they used to think they were fine - how do they build roads/railroads over permafrost in the north? - cog railways on mountains? - airport terminals - we use those a lot and I bet there is lots of design and infrastructure planning in their layout Have fun!
@che3se14955 жыл бұрын
God I can't even imagine what a nightmare horizontal traffic lights would be. Only reason I can use the road is because I memorised where each light is.
@Wordsnwood5 жыл бұрын
@che3se1495 -- better never visit Quebec then. Or Alberta. Hmm, according to Wikipeda also parts of New Jersey, Pennsylvania, Japan... (Not intending to be flippant -- I thought everywhere had blue mixed in the green these days to allow for red/green colour blindness. Maybe not.)
@TheOwenMajor5 жыл бұрын
Cloverleafs are fine for moderate levels of traffic and are a relatively affordable design.
@rfldss895 жыл бұрын
@@che3se1495 colorblind?
@che3se14955 жыл бұрын
@@rfldss89 Yeah, normally not that bad but I just got used to relying on the position to avoid the confusion.
@rosspalmer98753 жыл бұрын
An interesting issue that arises with stressing concrete is that it it is not as good at resisting impact sounds. As an acoustic engineer we test many concrete floor slabs to find their levels of impact insulation. An unstressed slab always is better, compared to a stressed slab, at reducing the levels of impact noise for lower occupants.
@quilope11 ай бұрын
I am so glad I stumbled across your comment! I am learning as much as I can about concrete, because I'd like to start building speaker cabinets with it. I'm no engineer, so anything written in English like this is a huge help. I'm not surprised the pre-stressed stuff transmits sound more readily. It's more compact, and that would include all the cracks, air pockets, etc. I could see how that would provide less resistance for the vibrations to travel. Do you know anything about volcanic pumice powder being used as an aggregate for "higher strength" mix? Or have any experience with light-weight concretes?
@cdouglas19425 жыл бұрын
Long ago in my Public Works Admin career, I got to visit a prestress plant to observe a girder being build for a bridge my city had commissioned. The science of the shape, drape and position of the tensioning cables and the arc of the girder form itself was quite interesting.
@Chiaros3 жыл бұрын
I seriously loved this in-depth look at concrete. I have no idea why, I work IT from home. But it still feels like I learned something super useful.
@odin_35 жыл бұрын
If this is my teacher in engeneering.... MY LIFE WILL NEVER BE BORED
@TheCook5055 жыл бұрын
Exactly what I was thinking
@davidbuschhorn65395 жыл бұрын
Pre-stressing is big in tractor trailer trailers. If you look along an empty flatbed trailer you'll see it bows upward. When fully loaded, it's flat. That's one way police can chase down overloaded trucks at a glance. If the trailer is sagging, it's overloaded. You can actually cheat a bit and run a few beads of welding rod down the entire length of the bottom of the trailer beams. As the beads cool, they'll pull the beams into more of an arc ;-) It gives you a little more "spring" in the bow of the trailer. It won't make any difference at a weigh station obviously. Your weight will be your weight :-) Around here, mostly you only have to worry about weigh stations at state lines.
@davidbuschhorn65395 жыл бұрын
@ClickThisToSubscribeYes. They use it in manufacturing the trailers to begin with. Mobile home trailers in particular.
@mytech67795 жыл бұрын
The weld beads do create a bit of light pre-stress in the beam, but the basic camber arc is not by its self a form of pre-stress. The beam still deflects about the same inches per ton, you simply changed the starting point.
@ceasaraugustus17585 жыл бұрын
Camber, not prestressing
@fieroboom3 жыл бұрын
Dude. I LOVE the way you do your sponsorships. I already pay KZfaq for ad-free video, & I'm usually genuinely not interested in all the sponsors I've seen so far, but you are the ONLY one who gives me the option of not having to sit through the ad or try to skip through it, and I *GREATLY* appreciate that. If I'm not interested in the product, then the ad is just an irritant. You mention the sponsor up front, then do the ad at the end, which allows me the opportunity to decide if I want to watch it, and that is awesome. Thank you!! Awesome videos too!! 😁👍 I love your scale models; they really drive the point home & make the subject matter easy to visualize.
@HepauDK5 жыл бұрын
Greetings from Denmark, home of the best sand for concrete. :) Without prestressed concrete, I would have had far less to do at work for the past year. 14 railroad overpass bridges (reverse T-beams, dang that white, high alcalic cement cures fast!) and 2 parking houses (TT-plates and parking decks, dunno what they are called in english) under the belt. And that's on top of the normally rebarred stairs and landings I have made production drawings for. :) The heaviest beam I have drawn so far was a 1400mm high and nearly 19m long dual console beam (800mm consoles) weighing 41,86 metric tons. All becsuse the architect wanted to fit in one more parking space between each column in the parking basement under a supermarket with 3 floors of appartments above it...
@TruthSeekerD5 жыл бұрын
Glad to hear that in other countries there isn't a war being fought against the personal automobile. Around here, they wouldn't bother to build any parking or they'd put in a dismally inadequate amount.
@silviuguseila25524 жыл бұрын
@@TruthSeekerD you might be surprised but we have no idea what "around here" means for you
@kokodk24 жыл бұрын
Godt det ikke var mig der skulle armere den søjle haha
@LordDoddka4 жыл бұрын
laughs in Australia
@kindlin3 жыл бұрын
@@TruthSeekerD Also missing most the point of the post. He used that as an example of an architect gone wild, not a good design philosophy.
@diamondflaw5 жыл бұрын
I’m not recalling if you’ve covered this before, but I recall reading a paper talking about how modern fast-setting high strength concretes are more vulnerable to fractures due to increased thermal expansion while curing than old slower setting concretes.
@DeadlyNinja2475 жыл бұрын
You should now try focusing on shear reinforcement, as the failures you have demonstrated are quite brittle, and in the real world not ideal, as you don’t want a RC member failing so fast. Good videos these are awesome (y)
@clee87685 жыл бұрын
If you watch the second beam failure at 0.25 speed you can see that the failure mode is actually the back right stressing anchorage. But yeah all the others are shear failure. I doubt he waited very long for the concrete to cure and could have used a larger washer than what was on there.
@DeadlyNinja2475 жыл бұрын
C Lee yeah that’s a type of failure you have with PT concrete (at the end of the ducts/anchorage). The rest of them throughout the concrete series has been shear failure.
@MattCasas4 жыл бұрын
Punching would help .
@mfbfreak5 жыл бұрын
Your videos make me think of those 1940s-1960s films that explain all kinds of tech stuff. I love those, and i love your videos! I love the demonstrations of those basic things like how concrete cracks under stress, but doesn't fail.
@mfbfreak5 жыл бұрын
I have no idea if engineering was more popular in the past than today. I mean, this channel does have hundreds of thousands of subscribers. I do often get the feeling that these days, people don't have a feeling for mechanical stuff anymore. But that might very well be because we have all grown up in a world where cars just work and go for 100.000km without special maintenance, where large spans are completely ordinary in big buildings and where tens of millions of transistors fit into your hand. It's so incredibly ordinary to us, that not that many people stop to ponder 'how did that happen'. I can't blame those people...
@mytech67795 жыл бұрын
Those old films were originally only shown on a limited basis, usually in specific training courses. Second up is that they are too on point for the post-modernist infested system that seems to have a need for adding a bunch of extraneous crap pushing subtle political ends even at the expense of the technical material at hand. KZfaq to the rescue, at least for the moment ...I really don't enjoy having all the eggs in one basket.
@war_correspondent Жыл бұрын
Watched this before final exam for reinforced concrete design 2 this morning. Thanks for simple explanation!
@PracticalEngineeringChannel5 жыл бұрын
Okay, okay - I think this one will conclude the series on concrete (for now!). It's time to move on to a new topic :) For now, support the channel by checking out Dashlane - it's free and I hope you find it useful! www.dashland.com/practicalengineering
@dh31435 жыл бұрын
Flex seal? The best adhesive on this planet!
@guitarjoel7175 жыл бұрын
I love your concrete series - I hope to see more concrete videos in the future! I have no suggestions for new ideas at the moment, but I will let you know if I come up with anything. Thanks for your excellent and informative videos!
@yeiiful5 жыл бұрын
Pre fabricated methods of construction?
@danielallemang94145 жыл бұрын
How do they build bridge bases underwater?
@rommeldemesa25795 жыл бұрын
Steel structures!
@CybranM5 жыл бұрын
Love all these concrete videos! I didnt know it could be this interesting
@columbuswaterpark13125 жыл бұрын
first time in my life that engineering lectures dont make me wanna run away. these lectures are so friendly and inviting that they motivateme to staart a career in this field
@francescogiuseppearagona11093 жыл бұрын
In Italy there was a famous architect who specialised in prestressed concrete, Riccardo Morandi. He designed a bridge in Venezuela over the Maracaibo lake, which is still in use, and later a very similar, but smaller one in Genoa, that unfortunately collapsed 3 years ago due to poor maintenance.
@shubhamshrivastava58123 жыл бұрын
This is the guy, who scored an A in every subject in his engineering college.
@1linkbelt3 жыл бұрын
and it shows!
@zuilok5 жыл бұрын
I really love the way you handle the sponsor pitch. You mention it in the beginning which you probably have to and then leave it for the end of the video where I can just turn it off. No looking for the actual start of your video.
@gabrielfraser21095 жыл бұрын
Just soldier through it, KZfaq analytics tells him where viewers tend to stop watching, and that probably affects sponsorship revenue.
@gabrielfraser21095 жыл бұрын
Dark Phoenix You get a free video. You know, the video you're watching. It actually took time and money to make, and all he asks is that you listen to the sponsorship.
@JimVito5 жыл бұрын
@@gabrielfraser2109 exactly. The sponsors probably wouldn't keep paying if they know their advertisement is not being watched. If I enjoy a creator, I always watch them.
@crazydragy42332 жыл бұрын
Despite the episodes feeling a little recycled and stretched out at times this has been a lovely introductory series.
@adrianstudios5 жыл бұрын
I love when you talk about member stressing and tensioning and servicing. The vibrating stuff only encouraged the 12 year old in me. Excellent video though, rock hard.
@membersonlydave5 жыл бұрын
Thank you for posting more Concrete videos. This is great.
@usacomp2k35 жыл бұрын
Rally enjoyed this series. Also really enjoyed meeting you at Thinkercon. I’d love to see more in water hammer. Is hydraulic fluid susceptible also? Does viscosity change the effect?
@GeneralJackRipper2 жыл бұрын
I have only arrived at concrete today, but I can already tell there are two types of concrete channel on youtube. One that talks about concrete, and one that actually pours their own concrete. Good job.
@jojojorisjhjosef5 жыл бұрын
I love this channel, as a electrical engineer I can keep learning new stuff from this channel.
@barefootalien5 жыл бұрын
Great video as always! I have a question, though (*and an idea for another video!*) Our house is built on a post-tensioned slab, rather than a deep foundation (suburbs of Phoenix). It has warnings imprinted on the concrete never to drill or tap holes, and when asking a construction contractor why, he said "because the entire slab will basically shatter and explode". Needless to say, as someone with a science and engineering background, I find this... unlikely. Concrete is brittle, but not *that* brittle. But is he right? What *does* happen if you damage pre- or post-tensioned concrete under load? I'd love to see a video where you build another beam of pre- and post-tensioned concrete, and instead of just amping up the pressure with your press until they fail, instead put them under their design load, and then drill into them to see if they exhibit such a spectacular failure mode as this guy was describing. If they don't, then you could explain why the slab has that warning. I suspect it may simply be because if you damage the reinforcement while you drill into the concrete, *that* could be bad indeed. That I could actually see creating some sort of (minor)explosive failure state as the steel snaps rather than bending like it did in this video.
@BlackBirdMax5 жыл бұрын
Great video. Really enjoy your work. Informative and a pleasure to watch. As a plumber I would love to see you cover electrolysis. The importance of dielectric unions and nipples.
@truckertech92725 жыл бұрын
As a former home inspector, I would love to see this too. I saw di-electric unions on water heaters often and also saw what happens when you don't have them.
@8432925 жыл бұрын
@@truckertech9272 I'm having a home inspected tomorrow... what's a di-electric union?!?
@truckertech92725 жыл бұрын
@@843292 This YT video covers it really well. kzfaq.info/get/bejne/bMuhftaK3JOWk30.html
@shenron29423 жыл бұрын
This is the overview of Prestressed concrete and I understood easily what's the difference between RCC and PSC, now I can learn PSC design more easily
@cherylm2C6671Ай бұрын
I like this man's homework, and the presentation isn't slack, either.
@UpcycleElectronics5 жыл бұрын
Idea: advancements in the plastics side of composites. I tell people all the time about how a carbon fiber bike is really just "plastic with stuff in it." People tend to focus on the fabrics because they are visually interesting. I spent several years as a buyer for a chain of bike shops and could clearly see, if steel bikes had remained the standard they would cost far more than plastic bikes do now. They are far more labor intensive and have several engineering limitations when it comes to tubing dimensions and bike sizing. To the uninitiated: steel road bikes were sold in ++1cm sizes from 48cm to at least 61cm with many models/brands selling higher and lower sizing. The plastic bike lead to the innovation of "compact geometry" and shifted the sizing of bikes from, mostly frame specific sizing, to a more flexible individual fit by changing the bars, stem, and seat post. A steel bike of the past would come in at least 13 sizes for each model. Modern bikes are offered in less than half the number of sizes per model. This greatly lowered the investment needed per model for wholesale distribution networks and retailers alike. That change lead to the diversification of the bicycle market into all kinds of specialties. The molding technology has come a long long way, especially the interior forming technologies currently available. There are also lots of interesting advancements in doping additives like hollow and/or lightweight fillers. The one tech that I think is a bit more interesting is the addition of basalt dope for carbon fiber wheel braking surfaces. The fact that a clincher tire mount flange can be incorporated into a rim design with a plastic braking surface is remarkable. The heat of a 180lb person/bike stopping quickly from 60mph+ coming down a mountain with a thin piece of plastic stopping them is voodoo. Those are the usual geeky talking points. The aspect that I've never heard about in any depth is how the actual epoxy plastics have changed and evolved on the chemical side. At most people will talk about the mechanical design aspects like, "real structural carbon fiber fabrics are almost always a uniweave with around a 45 degree lay up. Or they will mention the diameter and refinement of the individual carbon threads, combined with higher vacuum power, and resin percentage control are the factors that determine weight versus strength in the composite. People like to focus on the fiber because dumb monkeys buy shiny things. They don't like to remind people, ultimately carbon fiber composites are just plastic with stuff in it. What's the real story on the plastics side of current composites engineering? -Jake
@petroelb5 жыл бұрын
I get the feeling you are talking a much higher end bike than what I ride.
@UpcycleElectronics5 жыл бұрын
@@petroelb Which of my six are we talking about? Felt AR4 (main/rebuilding on the stand now) LeMond Tourmalet (main back up/steel is real - fun to stomp others riding carbon bikes with) Cannondale SuperSix HM (cracked) Cannondale R900 (in pieces under my bed) Cannondale Jekyll (storage) Bianchi 928 (parted in storage) ...the benefits of making next to nothing for a paycheck while working in bike shops...
@mytech67795 жыл бұрын
Compact geometry is completely independent of the basic frame material. The main limit on steel is the low dent resistance of very thin wall large diameter tubes needed to take advantage of steel's properties in this application. I am quite familiar with aerospace composite engineering (experimental airplane structural components more specifically) and... no, a composite is not just plastic with stuff in it. In fact the polymer matrix (which is not a thermoplastic in over 99% of carbon fiber products) is only there to bond the fibers into a fixed position, very little primary strength and stiffness is contributed by the matrix. The fibers are of very high elastic modulus and the polymer is of modest to low elastic modulus, the matrix may be to 10% of ultimate stress/strain when the fibers fail, and the matrix won't have the ultimate strength to take up the slack after the fibers have broken; think of a rubber coated steel wire. The polymers used are most often epoxy or cross linked polyester, but some use polyimides for high temp applications and dynamic bearing surfaces without the use of metal inserts, vinyl-esters for a water barrier in submerged items like boat hulls(prevents osmotic-pressure blistering), phenolics also pop up a fair amount as they tend to be dimensionally stable easy to bond post cure and economical in certain production situations also somewhat fire retardant. Epoxies adhere to most fibers better than polyesters but epoxies are more expensive and have lower modulus of elasticity and the only time adhesion tends to be a primary concern is with aramid fibers[kevlar tm], which are in turn only used where you need loads of toughness and impact resistance and so the lower modulus is not a detriment as aramid composites tend to be relatively flexible in any case, and due to low adhesion designs should limit compression loading. (as the matrix, especially bonding with the fiber, does play a fair roll in compression loading) Specific variations on resin products within a chemical family tend to come down to processing performance as much as final product strengths: cure temps, cure time, viscosity, sensitivity to mixing ratios, defect rates with a given process, shelf life, etc.. The needs of resin for frozen pre-impregnated fabric to be cured in an autoclave is quite different from the needs of a field repair using any of a wide variety of fibers over some mystery base polymer.
@UpcycleElectronics5 жыл бұрын
@@mytech6779 Cool read. The steel bike compact geometry limitations comment is really referring to the practice of lugged frames where the lug shells were designed for use on multiple frame sizes. Filet brazing is possible but was always more labor intensive and required more skilled labor in general. The cost effective/low end/entry level bike market is what I'm primarily referring to as the limitation. You know far more than I do about polymers and composites, but that's exactly the kind of stuff I'd like to hear about in details I might better understand. I have as much experience as can be expected from someone that painted with PPG DBC and Omni for years professionally, and played around with a few amateur composite projects. I've also picked more than a few engineer's brains at Interbike in Vegas, but I'm no expert, just exceedingly curious. -Jake
@immeohmyoh5 жыл бұрын
MyTech you sound like you know your material's science. What could i put over large 220watt solar panels in place of the front-glass that was cracked into thousands of tiny pieces falling out. It needs to be transparent, & preferably lightweight and rain&sun.heat/cold proof. Preferably paint/pour/spread/stick/iron-on as opposed to cut (like glass) and size on. Is there a resin/epoxy/laminar/sheet etc whatever that fits the bill? I'm not sure if i can just leave the solar-crystals exposed without a covering and dust them off once in awhile. I assume the glass was there to keep them dry but what do i know.
@mindockMK15 жыл бұрын
Grady's wife: What do you want for Christmas honey? Grady: A construction grade concrete vibrator
@frankmiller953 жыл бұрын
lt's the other way around. He asks her and that's her answer.
@harshwardhansinghgehlot74875 жыл бұрын
Thankyou so much I'm a student of civil engineering n I was searching for this how to perform prestress at collage , that's a great idea given by your video...
@bonanzatime5 жыл бұрын
No One Says It Better Than You, My Friend. God Bless You. ..It's good to know there's someone like you in the world. ...the world needs More engineers like you.
@schneir54 жыл бұрын
I'm a "concrete professional"!
@PallavTHEsinha3 жыл бұрын
Good luck to you sir!!
@schneir53 жыл бұрын
@@PallavTHEsinha Thanks! I just make the cad drawings at a precast concrete company, but I think that counts, right?
@DanSheldon485 жыл бұрын
How about doing something with Roundabouts. Show how do drive them and how they are safer than traditional intersections. Also show how they drive them in Europe and how they would function better in the US if they where driven correctly.
@imemine74 жыл бұрын
Greetings from Australia where we imported roundabouts from the UK but forgot to teach people how to use them.And we usually make them too small.
@AyeCarumba2213 жыл бұрын
Dan: the challenge here is roundabouts are not common enough in the u.s. for people to really be comfortable with them. In Europe, they are commonplace and everybody is mostly on the same page about procedure.
@SergeidFedotov8 ай бұрын
Hello Grady! I am a fan of your videos! As a structural engineer, I want to mention, that models seem to be a little off the dimensions of the beams and overreinforced. So, in addition to bending, destruction occurs from punching along inclined sections.
@tractorboy314 жыл бұрын
I used to make precast concrete walls. We used 5/8 7 strand cable that we pulled 240 ft of cable each run and we used around 14 to 30. We had to string it through end panels for tops and bottoms of the walls and blockouts for doors and window or similiar stuff. Then when ready we set up a hydrualic ram and cleared the safety zones for tensioning. 240 ft of cable we stretched around 14 inches. Qc operated the tensioner and had a gauge he watched then when finished we gave him the stretch measurement as a double check cause if he pulled said pressure and then got a 20 inch measurement instead of 12 inch range a strand possibly broke or its strength is compromised another way so we would scrap the cable and redo it. ( made it real fun when we realized after tension engineers didnt call out a plate on the top side of pour needed strand strung though it so we had to detension cable and pull it out and jig the plates and restring and tension it again) supposed to do 1 pour a day boss canceled that pour due to time loss
@fsmoura5 жыл бұрын
i wish i'd come up with a good joke, but i'm not good *under tension*
@Joshua79C5 жыл бұрын
that was such a stressed joke
@kapilbusawah71695 жыл бұрын
This is sorta stretched out a bit
@mugnuz5 жыл бұрын
Just bubble out with a concrete vibrator
@SlidewaysMotion5 жыл бұрын
Your comedy isnt *cracked* out to be all that much, but im still *pulling* for you.
@fbiagentmiyakohoshino82234 жыл бұрын
fsmoura all of these jokes are gay
@juan31415 жыл бұрын
*so this is where it all ends huh?* *THAT STRESSES ME OUT*
@juan31415 жыл бұрын
*TOO MUCH PRESSURE, I'M ABOUT TO CRACK*
@fsmoura5 жыл бұрын
*solid* joke 👌id laugh but im too *dense*
@georgegreen34705 жыл бұрын
I see what u did there
@beepbeepcoyote5 жыл бұрын
Thanks for throwing stones in the mix......
@leerman225 жыл бұрын
RACIST FROG REEEEEEEEEEEEEEEEEEEE!
@kosinskiarek5 жыл бұрын
I don't do anything with engineering and your profession (engineering) but it sure is a joy to watch this and learn. Thank you for well executed video and your great attention to detail !!!!
@soldtobediers5 жыл бұрын
The working years from 1986 to 2009 of having been an Inspector of New Construction of Highways and Bridges for TXDOT... Highly Applaudes you're coverages of the characteristics of the nature concrete has up it's sleeves under tension & compression. 112718
@sighpocket55 жыл бұрын
What about concrete additives.....?
@TheKmaki5 жыл бұрын
Whats with "San Antonio" at the top?
@TheLe0165 жыл бұрын
It's the best place to live obviously
@babylonfive5 жыл бұрын
He lives there.
@TheKmaki5 жыл бұрын
@@babylonfive I figured as much. Thanks!
@stevevox49155 жыл бұрын
"finally got a construction grade concrete vibrator" casual... Concise and enlightening information none the less. I do always enjoy the professional nature of your short films Grady, very well done.
@telecasteredtodeath3 жыл бұрын
Great vid, I heard a mate say sometimes pre-tensioned steel reo can sometimes whip out of wet concrete and you don't want to be anywhere near it if does.
@funny-video-YouTube-channel4 жыл бұрын
Concrete university class 2020 :-)
@GFmanaic5 жыл бұрын
I didn't know my life needed more concrete, but then here we are
@Lorkin325 жыл бұрын
Your video series has inspired me to one day build a 3-4 meter monument of myself in concrete, which I hope will stand the test of time and make people in 30 000-40 000 years or so believe i was a great king or mighty fighter or something like that. The plan is to make it so unconvenient to move or destroy that it's just allowed to stay
@sifatulislam62344 жыл бұрын
THank u for this video .I am civil engineering student . 4th year running alhamdulillah . This video helped me a lot.
@teamgrimaracing36075 жыл бұрын
Hiiiiii from Sydney Australia do I have any fellow Aussie friends
@ZeppSiros5 жыл бұрын
Sure. Up in Brisbane. These videos are great
@fsmoura5 жыл бұрын
Fun fact: in Australia, the pre-stressed concrete rebar is _compressed_ instead of _distended,_ because it's in the Southern Hemisphere, and thus spinning the other way.
@OrcinusDrake5 жыл бұрын
Perth engineering dropout reporting!
@jamesmccann5315 жыл бұрын
I am not Australian, but I do know that the Sydney opera house is held together by steel cables, effectively compressing the concrete into itself.
@catprog5 жыл бұрын
Brisbane here
@fsmoura5 жыл бұрын
1:32 ultimate strength best strength
@shanerandon38885 жыл бұрын
More concrete! Addmixtures! Corrosion control. Nano technology. Love this series, it makes explaining things to customer's requests easy peasy. Thank you.
@shanerandon38885 жыл бұрын
Ooooh and pressure on formwork when pouring concrete.
@victorpetchenev41193 жыл бұрын
6:37 Предварительно-напряженный железобетон классно взрывается! Хотя если бы с торцов стояли шайбы большей площади, блок бы еще немного продержался .
@zachlap30204 жыл бұрын
« Not all cracking is made equal » Me: that’s crackist
@abunchofiguanaswithinterne21865 жыл бұрын
*weird flex but ok*
@nigratruo4 жыл бұрын
I really like how civil this discussion here is, usually it is a lot more uncivil when talking about such a concrete example. KZfaq comments normally cements its reputation as a trollfest.
@abdullahalmahruqi19765 жыл бұрын
It is never useless to learn from this channel! Please do upload videos about loads taking by bridges, especially live loads.
@fiegenfiegen4 жыл бұрын
As a technical translator. I had never fully understood what they meant with the pre-stressing and the post-stressing thing! Thank you! The explanation goes straight into my translation office's termbase (our database for terminology).
@niagarawarrior96235 жыл бұрын
and NOW i know what prestressed concrete is, and why its so awesome.
@sudeep25804 жыл бұрын
By only theory it's was difficult for me to understand the concept of pretension and post tension in concrete but this live practical cleared my concept. Thanks
@SonnyDarvishzadeh5 жыл бұрын
I've been using KZfaq for more than 12 years. Your channel just broke my record of liking videos of a single channel in short period of time. Or maybe physics is what fascinates me the most..
@olekaarvaag94055 жыл бұрын
My day always gets better when you upload a new video, especially about concrete. I love the demonstrations you take the time to build. They help a lot in understanding the concepts! ... I'm not going to comment on the "construction grade cocncrete vibrator".
@wdobni3 жыл бұрын
good video....clear, brief, and to the point.....it might have been augmented at the end by a demonstration of how a prestressed concrete bridge section is actually made at the factory
@SteveChisnall3 жыл бұрын
I'd like to see a video on how and *why* concrete is aerated (via autoclave or other means) in certain applications, and explaining *when* aerated concrete is preferable to more densely consolidated concrete.
@evilkidm93b2 жыл бұрын
I like the post-stressed version most! nice idea.
@devintiebout5 жыл бұрын
I love how you go over concepts I JUST talked about in Reinforced Concrete Design, Soil Mechanics, Hydraulics & etc... at UMKC. Keep up the good work!!! Love your content!
@marblemasIer5 жыл бұрын
Building on Permafrost would be an interesting topic. Here in Alaska its a huge issue, and some really cool solutions have been developed (pipelines, building foundations, etc)
@stan0s3 жыл бұрын
I've worked I the steel game for around 5 years and never fully understood the difference between conventional and p.t decks. This gives clarify and should be taught befor when ever someone is new to the game
@RichardLightburn5 жыл бұрын
Wonderful!! It makes sense that prestressed isn't significantly stronger than simply reinforced, but I hadn't articulated that. Thanks for the insight!
@noleshot27133 жыл бұрын
Something I’ve wondered about but never took time to investigate: what is prestressed concrete? Thanks for a clear, elegant tutorial! Suggestion: a video of the manufacture of large prestressed structures and how the the massive forces in production and usage are managed....or not!
@OTOss83 жыл бұрын
Neat, I'm a dummy that didn't do well in school but I learned something here. Thank you for that.
@Barbacito3 жыл бұрын
The Morandi Bridge (the Genoa Highway bridge that collapsed on 14 aug 2018) was one of the first structures built in prestressed concrete (mid 1960's). But the blame, apart from the criminal absence of mantainance, is air contaminants and pollutants that went right through the cement and corroded the steel inside (and the concrete itself)
@surendrajaiswal89355 жыл бұрын
Seriously I have never understood the prestressed concrete theory but now I have seen the practical
@John-pv7gk3 жыл бұрын
This video is very interesting. It's really important for students to study with visual presentations so that we can imagine and know what we are actually dealing with. It's so annoying that our instructors jumped to a topic and disregard the definition of prestressed. They already discussed the basic concepts of prestressed without giving definition. I just know after I watched this amazing video that the purpose of pre-stressing is to reduce deflection. Didn't mention in our class 😑
@jetblackstar5 жыл бұрын
Binge watching this series and all your previous. thoroughly enjoying. Can you consider doing a vid on concrete foundations and how they strengthen a building. I know the rough principles but you do cover some awesome detail in remarkable brevity.
@CanCobb Жыл бұрын
Fun fact - in my province, post-tension concrete spans require periodic inspections by an engineer to retain occupancy. It's an expense that condo corporations are only beginning to feel as the buildings where this is common are requiring service. They are SUPER useful to create building designs with fewer columns, but they add significant costs to the owners over time.
@papa-jerbear43925 жыл бұрын
Enjoyed the video. I was hoping you would also talk about the post tensioning with cables and rebar. In a lot of beams you have rebar continuous across the bottom and cables running through it as well in a Cosin arch with the high points above the theoretical supports and the low point of the cable at the center of the beam.
@sgtkasi5 жыл бұрын
Engineering is fuckin' wild, I appreciate the work they do, but goddamn you people are essentially physical magicians to me
@blipco55 жыл бұрын
Great explanation and demonstration as usual. The vibrator...Dont get carried away with it. Too much vibration in the mixture and you wind up with air bubbles due to cavitation.
@dimesonhiseyes91345 жыл бұрын
It should be noted for those that care that a prestressed and poststressed member is almost always reinforced with non stressed steel as well.
@chrisc599111 ай бұрын
You guys always had the toys I wanted back when I was younger
@gerarbendfeldt5 жыл бұрын
Thank you for your videos from Guatemala. I have a question, and I hope I can see a video about this subject. So, what about the transversal reinforcements inside concrete beams? What exactly are they doing? It represents a improvement in resistance? Cool videos. You are the real mvp!
@mikez41325 жыл бұрын
Nice shot of the Ft. Duquesne Bridge at 1:35 for any Pittsburghers...
@rolfbjorn99375 жыл бұрын
I really like wood as a construction material. I'd like to see you attempt to make a steel, concrete, wood, and composite structures (mini bridges? or hollow cube ) and testing them. You could even go as far as making a box that fits them and light the test subjects on fire, and see which one survives the best. Nice surprises could come out of this.
@gabrieljuegayaprende Жыл бұрын
thanks, Grady your videos are so cool and interesting for me
@brianthoman71425 жыл бұрын
Your example gadgets really help illustrate the concept you're showing us clearly. Great job!
@stevefanis10624 жыл бұрын
Great series you have! Would love to see a a few videos on bridges and tunnels. Keep up the great work!
@maulfiabbas22643 жыл бұрын
explanation is understandable and your efforts to explain the theory is outstanding to me. good job pak.
@TakumiFujiwara803 жыл бұрын
As a follow up of Genoa Bridge collapse i find this video incredible interesting... THX! Subscribed and like.
@ab_ab_c5 жыл бұрын
Excellent vid as usual! Thank for sharing your knowledge, experience, & effort!
@HB-ps6rn5 жыл бұрын
There is an underground parking garage near me and when you park on the ground level you can feel the structure moving. Definitely an unsettling feeling but interesting to experience
@avid0g5 жыл бұрын
Try walking in the pedestrian lane on bridge with fast moving traffic. Feel the waves!
@FilippmitF2 жыл бұрын
It's interesting that in my appreticeship to a architectural draftsman I learned what reinforced concrete is but not that there is something like tensioned concrete
@vituvieira5 жыл бұрын
Omg, your channel is so good. Better than a lot of my university professors
@Jookyforever5 жыл бұрын
Very good job explaining the basics, and thank you so very much for knowing it doesn't make it flexurally stronger than mild reinforcing!
@michaelking15794 жыл бұрын
A fascinating, clear explanation a layperson can understand. Thanks for the explanation.
@MrTotalAhole5 жыл бұрын
I love concrete. Not an engineer or even wanna-be engineer, yet I find this stuff (everything on his channel) fascinating.
@richardmcgrath79594 жыл бұрын
Very noticeable difference in the modes of failure between the two members.