How Strong Is Concrete? Hydraulic Press Test!

[@HydraulicPressChannel]

Thanks to Vabe / Rudus for providing the test samples for the video! It was super nice to be able to test this with official test samples and they also happened to fit our 150 ton machine really nicely! Also happy holidays to everyone! I am taking couple days of from the youtube so I am not super active on looking through the comments during this time.

[@lajoswinkler]

Very interesting video. For the next experiments with concrete, try bending loads. Try mixing your own concrete, too.

[@pete5405]

@@lajoswinkler "Try mixing your own concrete, too." yeah, especially with rebar ;)

[@steveshoemaker6347]

AWESOME VIDEO.....Thanks very much from USA🇺🇸

[@drewcagno]

Have a very nice and relaxing holiday.

[@dillon5285]

You should try with Roman concrete now that we know the recipe

[@Iamthelolrus]

I'm starting to wonder when they will get around to splitting the atom on this channel. It just seems like a logical progression.

[@supersim81]

No they gonna crush the atom :D

[@fred_derf]

If they get into nuclear testing, they'll be testing fusion, not fission.

[@KlodFather]

@@supersim81 - They will collapse the Neutronium sample they have and cause a total protonic reversal where it opens a black hole and the press slips through a hole in spacetime and ends up in another part of the universe. I know for sure because I learned it from Captain Proton on TV and I am wearing my Hydraulic Press Enganeer Hat LOL. They will discover that in the space on the other side is every sock, glove, shoe, and everything else that anyone ever lost. That is where they go. (YA DURAK)

[@onemoreguyonline7878]

Accidentally starts a fission reaction

[@ABrit-bt6ce]

Lowri, "where's my chisel" In an Australian accent. (Young Einstein thoughts there).

[@Kragatar]

That press is impressively durable. 8 years of exploding stuff in it and it still shows no signs of wearing out.

[@PereMarquette1223]

I’m sure it’s been maintained properly and had components replaced or rebuilt overtime.

[@MrNukealizer]

It did have a problem once or twice with the hydraulic lines popping off after stuff exploded. That's all I can think of though.

[@PereMarquette1223]

@@MrNukealizer given the amount of force that is applied, that’s to be expected. Rubber hydraulic lines grow old and fail at times too.

[@HydraulicPressChannel]

@@PereMarquette1223 Might be hard to believe but I have only replaced on connector during the 8 years :D Sure there is some explosions but other than that it has been on quite little of use. We run it maybe 3 hours per week on average. On some jobs these might run 24/7 for many years without any problems.

[@HydraulicPressChannel]

@@PereMarquette1223 This has steel lines so no worries about those breaking

[@repeat_defender]

I keep wanting to say I can't believe this channel has 8.83 million subscribers, but I really can believe it after I watch because every crush is exciting as hell. It's like, universally entertaining.

[@ThatOpalGuy]

They've crushed my hopes of ever matching their subs

[@djosbun]

Agreed!

[@janeblogs324]

Just imagine if they spoke English, 20m sub's !

[@billboyer8897]

Had friends who tested concrete samples for a living. They took two samples for each pour, and if the first one tested OK, the second one was surplus. We often used them as winter ballast in the truck or van, to help get around in ice and snow. Some house levelling companies use the left-over cores as piers, and some landscapers use them as edging.

[@halfnelson6115]

The launch pad that Starship destroyed on the 1st launch attempt was made of concrete called Fondag. It would have been interesting to see that tested, too.

[@SamanthaTotimeh]

After all these years, I still love this channel and their videos! Also the final concrete's face was hilarious and explosion was awesome!

[@CMDR_CLASSIFIED]

The googly eyes and the faces are the best! Merry Christmas to you and yours!

[@GFantastic]

I do this every day at work but ours hardly ever explode - I think you're stressing yours much faster than EN 12390-3 allows. You generally get a higher result if you stress them faster too.

[@HydraulicPressChannel]

We have also really flexible press. The table bends something like 10mm so the explosiveness comes from that mostly

[@Alpejohn]

I have been working with this to for many years in my previous job. We tested with cubes, and it was not uncommon that they exploded, but that only happend with the strongest types of concrete after 28 days. But this was a really interresting video non the less! 🙂

[@ArmaGuyz]

Depends on the Press the one I used had a swing handle and it went at a set speed you couldn't make it go faster or slower. When I tested Cylinders they almost always exploded I forgot about the 28 day Break its been a long time ago for me.

[@ArmaGuyz]

@@Alpejohn The Cylinders do too its pretty common I blew my door off the machine often. Usually the older ones got the big pops but sometimes a 7 day break could do that as well. Depends on who the Job was for. I didnt test many of the tiny cubes those were not much fun to test any how lol. We did soil samples with sulfur caps as well.

[@josephcote6120]

My first job during high school was working at a concrete testing lab. Hired muscle and janitorial services. We cast 6 inch diameter by 12 inch long cylinders by the hundreds. Mixed a big batch and poured it into metal can molds. When cured we stripped the cans off and prepped each cylinder. Each end had to be perfectly flat to match the surfaces of the press; we used little pie pans that we poured liquid sulfur into, then set the cyl into it. When it was cooled we did the other end. When ready we picked a fair number of the batch at random eliminating any with big defects, and put them into the press, squeezed them till they popped. The press had a huge dial gauge and a needle that moved with the main needle to show the max pressure. Recorded that number, cleaned and reset the press and did the next. After all the readings the engineer would go and write up an official report certifying (or not) that batch of cement. The last part of my job was recovering any sulfur that was still clean and in good shape to use again. All the torn open cans, busted cement, and unused cylinders went into a huge dumpster. $10/hr for a high school kid in 1978 was pretty good. Backbreaking labor was not so fun.

[@littleboy3459]

$10 in 1978 is at least worth $46 today. You're telling me you got paid $46 out of high school with no experience? Fml

[@VoltisArt]

@@littleboy3459 good jobs exist. They don't come along often, and yes, some people get lucky with their first try.

[@vaalrus]

I used to use these concrete cylinders to make shelves, instead of the ubiquitous cinder blocks… My mum used to work for an engineering testing lab. Most of them came home with poured sulphur caps that were added to even out the end pressure from the press anvils.

[@ArmaGuyz]

Usually we only did the sulfur caps for Soil Sample tests I didnt do much of that for the concrete cylinders. The Sulphur is heated to the flash point.

[@fred_derf]

I'd like to see the other samples used to test their Shear Strength, particularly with and without fiber reinforcement.

[@puzzleginger]

I would be curious to see what happens when you push a cylinder close to it's limit (say, within 10% of the breaking point measured in the current video), then release the pressure, rest the cylinder, and repeat the test to see whether they will still shatter at about the same point, or actually got affected by being pushed to the limit once already.

[@ireallyreallyhategoogle]

Interesting

[@ArmaGuyz]

Ive done it and I can say it depends on the age of the sample cylinder and the material its made out of. With weaker mixes the Structural intergrity of the cylinder is compromised already theyre often softer will it change the break pattern though NO. It shouldnt change the break pattern thats the whole point of Compressive Strength testing you want it to bust under load the same regardless of if you press it new limits and stop and doing it again or not. Youre simulating load conditions. How the break occurs is vitally important structural information. There are numbers that they go off of referring to the breaks typically one the busts and crumbles through our and cracks center would be a 4 one that shears and breaks the edges and holds strong with be a 5 on the ratings. I think there was anotehr number but its been close to 20 years now.

[@gth042]

Another type of strength contest: I wonder if shorter slices of the different samples could be combined into one mixed-stack sample. Also, providing a little outward tension by way of a large bearing ball might be fun -- hardness tester 5M. To heck with that, I hope you guys are able to enjoy a nice break and wind down from a chaotic year. Thank you for your uploads!

[@marchanson5935]

I am a concrete tester in Washington State USA. Watch your videos all the time! I was able to call within a thousand PSI what each of those were going to break at. 😂

[@gavinhay6627]

You can do the psi to kg conversion in your head ?

[@marchanson5935]

@@gavinhay6627 hell no. He listed the load weight in KG and lbs.

[@miza6]

as a tester can you comment on the fibers? from my recollection they are there to mitigate sheering forces not compression. like the first concrete test actually looked like it sheered vs crushed.

[@marchanson5935]

@@miza6 that is correct. Fibers do not add any significant compression strength.

[@psidvicious]

@@miza6 As a career concrete guy, I’ve only had the concrete spec’d with steel fiber used once on a job and it was used specifically for heavy duty wear properties. It was used for the floor of a new loading dock ramp at a trash recycling facility.

[@danwhite3224]

Actually surprisingly interesting I personally hate working on concrete that has steel fibres embedded because it's a pain to drill into... Burns through concrete drill bits in no time!

[@michaelwright2986]

10:45 "Hmm. That. went. well." I follow this channel for moments like that.

[@Hank_J_W0mbleton]

I know my day is going to be better when I hear, “welcome to hydrolic press chanel”

[@patrickperkins5817]

Please more videos with both of you I love the extra commentary

[@moletrap2640]

This was a great one, well done!

[@landsgevaer]

I would love to see such tests done with a sheet of rubber on both sides of the concrete to better spread the load. The force would still be the same, so no difference there: the rubber doesn't "absorb" any of the force. But you might avoid peak forces on tiny parts of the concrete's surface if the top or bottom surfaces are slightly irregular and not entirely flat. Once the concrete cracks in such a spot, the whole thing seems more likely to break, imho.

[@bundles1978]

I suggested something similar last time they tested concrete. I was ACI certified 20 years ago, used to run a concrete plant. 1. Not sure what euro standards are, but those cylinders were not made properly under ACI standards. you do not vibrate cylinders 2. If those were 8 inch cylinders, then you guys got roughly 3100psi, not that strong really. especially if that was granite they used as aggregate. 3. rubber or sulphur endcaps are the correct way to break cylinders. 4. have the company make some proper concrete, using things like a high range water reducer, a retarding agent, a high cement content, and silica fume/flyash if you can find it. Euclid chemical is the place to start in the USA, not sure about the EU. 5. if you do this, you will likely end up in the 12,000 psi range or even higher if you cure it correctly for 28 days. 6. only make a 4 inch cylinder, fill it in three layers, and only rod each layer about 10 times(I forgot the actual number here), screed off top and leave it. 4 inch cylinder is necessary as their machine likely couldn't break an 8 inch cylinder of this stuff as you would need at least 271,000kg of force if done correctly. follow this and if you can break it, it will be loud for sure. last time I tested stuff like this, the midsection literally exploded.

[@GOAT_GOATERSON]

Yeah, or a board or something

[@slechartley]

We use a cylinder end grinder at work, we only use sulphur on cores we can’t grind.

[@ANATURALDREWSASTER]

I think under these loads, a sheet of lead or copper may work well

[@roidroid]

​@@ANATURALDREWSASTERthe steel of the flexible press is probably ample tho, yea?

[@jimmeade2976]

Very interesting video, as usual. It would be interesting to see a test of how strong the concrete is to a bending moment. Support the concrete cylinder at both ends and press in the middle.

[@glynnepritchard2526]

Concrete is relatively weak in tension so would fracture easily, hence the use of rebar

[@cleanpowerelectric]

I love this episode! I did these tests in high school back in the 70’s. It was so much fun!

[@BetaMayra]

Nice! and Hannan's laugh made the video better

[@LukeAWallace]

Another shoutout to the indestructible lightbars in the chamber💪

[@kirk1156]

Make your own concrete mixtures and see what makes it stronger

[@HydraulicPressChannel]

I think I could try with stupid add-ons :D

[@hermitoldguy6312]

@@HydraulicPressChannel Only yesterday I was thinking about medieval concrete, and what they might have tried to a) make it stronger, and b) make more concrete for a given ammount of lime.

[@KernelLeak]

@@HydraulicPressChannel concrete + cornflakes = ?

[@PaulG.x]

@@hermitoldguy6312 There was no medieval concrete. The Greeks and Romans had a form of structural concrete using natural pozzolana but the technology was lost in the dark ages. Inferior slaked lime mortars were used until Portland Cement was developed in the early 19th century. The slaked lime materials were too weak to create structural forms from. The Pantheon in Rome is an example of Roman concrete construction.

[@ells5656]

They add carbon and other materials then also heat up the water when making it@@hermitoldguy6312

[@mencken8]

Best channel on YT. Change my mind.

[@19derrick77]

6:21 complete mayhem in the box… That’s pretty solid

[@ivanmac89]

Very cool, Lauri! I'm in construction in Canada and have done concrete many times but I've never seen the fibre additives, usually only liquid accelerators or plasticizers.

[@fred_derf]

We've used the plastic fibers before, they're used to replace wire mesh pouring floors.

[@terot8341]

Fiber additives aren't that much in regular use, but when building big warehouses etc. it's used. Reduces rebar usage a lot and much cheaper faster to lay down big slabs on one go. Pain in the ass to use tought, and all cement mixers and pump drivers hate 'cause it chews up all rubber hoses so quick.

[@timothybayliss6680]

We use poly fibres in Ontario pretty frequently. It interferes with a polished floor finish so we usually use it for stuff like loading ramps or parking. If you are putting wire mesh it can usually be substituted with fibres. Warehouses will have steel fibres.

[@johndododoe1411]

The Bible mentioned mixing in straw, so in the 1980s someone tried doing that in concrete, thus inventing fibre reinforced concrete .

[@fred_derf]

@@johndododoe1411, writes _"The Bible mentioned mixing in straw, so in the 1980s someone tried doing that in concrete"_ from wikipedia: _Historically, horsehair was used in mortar and straw in mudbricks. In the 1900s, asbestos fibers were used in concrete. In the 1950s, the concept of composite materials came into being and fiber-reinforced concrete was one of the topics of interest. Once the health risks associated with asbestos were discovered, there was a need to find a replacement for the substance in concrete and other building materials. By the 1960s, steel, glass (GFRC), and synthetic (such as polypropylene) fibers were used in concrete. Research into new fiber-reinforced concretes continues today._ So, you're wrong. P.S. Look up _wattle and daub._

[@rootbrian4815]

The high-speed shots were amazing!

[@villehursti]

Now this is infotainment! Hyvää joulua!

[@TaccRaccoon]

1:41 the timing was perfect

[@zapfanzapfan]

Best test result: Hannah laughs 🙂

[@kingginger3335]

It's really cool seeing it explode like that. Its not like normal things that you crush. Like typically the object you're crushing will expand and bulge. But the concrete looks the same the entire time until it can't take anymore.

[@DaveC2729]

I'm not surprised by the results with the fiber. As you mentioned later in the video, those additives are more about tensile strength; concrete already has more compressive strength than just about anything, so the additives actually sacrifice compressive strength to trade it for tensile strength. But beyond that, I've seen a company put its faith in the fiber additive for a high-stress application and have it utterly crap out, so my impression of the fibers is not a great one. So I would like to see you test the tensile strength by laying them down sideways, supported at the ends, and pressing down on the middle and see if the fibers are doing anything good at all, or if they're actually a bad thing. Also, I'm sure I've said this before, but your new (well I guess she's not all that new anymore) assistant's voice is soooooooo adorable! You should keep her forever. I'd watch your channel just to hear her laugh. I mean Anni's voice was kinda cute too, but this girl takes it to a whole new level.

[@Silentguy_]

You guys have really trained that concrete well. It knew to explode right after you said it was stronger than you thought for maximum comedic effect.

[@Gefionius]

Concrete is specifically extremely strong against compression. Not in any other direction though. That is why they commonly pre-stress/tension concrete.

[@psidvicious]

That’s also the reason for the reinforcing steel (rebar).

[@markissboi3583]

MerryXmas to the Squishy of stuff hydraulic channels cheers from Ozstraya

[@balazslakatos9817]

best test so far, very practical.

[@microbuilder]

Looking forward to your new press bunker!!

[@SeatedNickel]

I made a sleeve out of an old cylinder mold to place around the cylinder to help prevent excessive debris. Definitely helps with clean up.

[@CameronSalazar2113]

whoever built that box should be given a award for it handling what it went through today, and whoever made that glass or plastic should be given the cannot scratch award! amazing

[@owenbrau63]

I used to work in a municipal materials testing lab, this was what I did every day, usually at least a dozen or more. For some we had to use the BIG press, 400,000 pounds/182,000kg force. We wrapped them in a heavy canvas to prevent chunks from flying around the lab.

[@augustinep6193]

Good. Thanks. Merry Christmas.

[@charleswood3383]

That’s awesome. I actually worked in a concrete test lab and we regularly broke concrete cylinders every day

[@HydraulicPressChannel]

Did they explode this much? Or is it just my press that throws things around :D

[@massspectrometer6757]

@@HydraulicPressChannel The lab I was a part of had shielding around the press. There were holes in the drywall behind the press that shot through the spaces in the shielding sometimes.

[@HydraulicPressChannel]

Also did you ever add the faces to these :D

[@massspectrometer6757]

@@HydraulicPressChannel Much more character to your 6" cylinders.

[@andrerenault]

@@HydraulicPressChannelDetails are fuzzy (it’s been a few years), but generally we stopped pressing once we noticed the concrete had failed, but before it exploded. As you probably know, you can tell because the force stops increasing while the deformation increases. However, sometimes we missed it or were bored, and the cylinder just went. Of course we had shielding around it and PPE

[@photodave219]

That’s awesome. Merry Christmas!

[@maximilianrpm2927]

Arrived for the pressure tests, stayed for the googley eyes

[@seanstevenson7592]

My explodie buddy... Another award winning show. The commentary was great as usual and the screams are hilarious... Thank you. Keep up great work

[@stephenwend91]

Now I don't have to try this at home in my living room. Lol

[@FriedOnionsYT]

Thank you for such amazing videos I appreciate it

[@Innerspace100]

@@davidsmixer That's not Anni, that's Hanna. Anni is up in Lapland, and is no longer married to Lauri. All three are on completely friendly terms, though, so no drama whatsoever.

[@FixingWithFriends]

I was hoping you would do this one thanks! Could you illustrate different water ratios vs strength (if other people enjoyed it).

[@dennisnieradka6668]

Merry Christmas to you & your wife.🎄

[@CheerfulChipa]

@HydraulicPressChannel - I would love to see a test with different formulas of 3D Printed concrete. This would be very interesting!

[@TheEudaemonicPlague]

In the late seventies, the Army's Construction Engineering Research Laboratory just outside of Champaign Illinois had one of these, and they were doing tests on concrete just like that. They had an Explorer troop, too. I never actually joined the Boy Scouts/Explorers, but I took advantage of the situation--joining in on the fun. In addition to building a hot water solar panel and playing games on the PLATO terminals (two of them), we put things under the hydraulic press. I don't remember what we crushed, but it wad certainly fun. One thing that I keep remembering, though, is that my grandfather got his hands on a whole bunch of those concrete samples--he lined his extensive driveway with them laid end to end. I can't ask him where he got them--he died many years ago.

[@johnbewick6357]

Be interesting to see how Graphene mixed with the various concretes would change the results.

[@urg0ogame846]

Didn't know that Billy Corgan used to play Hydraulic press as well !

[@LordGrievous1970]

Yay! It's a proper video, not a 10 second 'Short' video!

[@SpartacusPlanktonpants]

It would be interesting to compare this professional grade stuff to DIY ready-mix, and also to a replica of Roman concrete.

[@stalhandske9649]

That would be very interesting indeed. The ability of certain Roman concrete structures to withstand being exposed to elements for thousands of years is astounding.

[@psidvicious]

@@stalhandske9649 The Roman concrete has survived so well because they did not incorporate steel reinforcement bars. In the short term the steel adds a lot more tensile strength but it also rusts over time which causes the surrounding concrete to spall out. As far as the bagged concrete available to diy’ers, if the instructions are followed, it will test to the prescribed strength+. Most people add additional water though to make it easier to work with, which weakens the concrete’s ultimate strength.

[@stalhandske9649]

@@psidvicious I'm gonna trust what you said, way out of my field anyway. What I was after, however, was more along the lines of how Roman style concrete compares to modern in terms om components. My understanding is that Romans used pozzolanic ash, plentiful in Southern Italy but not an element of modern concrete as far as I know. This component made concrete well suited for underwater casting.

[@johanjohnson9169]

That was actually one of my first jobs. I worked at skanska and did strenth tests with a hydraulic press.

[@AngelinaJolie734]

What's good about this channel is that it's never fake, it's always concrete. 😛

[@TradieTrev]

ROFL! Good pun!

[@Nyllsor]

Great episode! :)

[@Atheistic007]

The anthropomorphism makes it engaging!

[@jayburkhart1781]

you have way to much fun sir.

[@Real28]

The energy that was released in the bridge sample is scary. But thats what makes concrete a modern marvel

[@booshmcfadden7638]

Those were very violent. MERRY CHRISTMAS!

[@theninearemine8499]

An interesting test would be to stack discs of the different concretes on top of each other. Press them and see which one fails first.

[@imacdonald99]

Very interesting when you crush proper things like this. The more serious the test, the more interesting it is.

[@technicalfool]

I'm wondering what would happen if you pressed some kind of crazy vehicle suspension spring down, tied it with wires, and then encased it in high strength concrete. Maximum mayhem, maybe? Don't put a deck of playing cards in there as well though. That might go thermonuclear when it lets go.

[@johndododoe1411]

Concrete provides very little pulling strength, so an encased compressed spring would push itself out . Concrete buildings are held together by steel, concrete just prevents it from crumbling .

[@hurricane9634]

Video idea: put some flash powder (very sensitive explosive) in a thick steel cilinder and crush it with a piston (the flash powder should be sealed inside). I wonder what would happen when the powder ignites under pressure

[@apismellifera1000]

Every time the concrete blew up I jumped. Happy Holidays to Hydraulic press channel.

[@RetroScythe]

You should try testing concrete at different temperatures, try heating one, leaving one outside and freezing one. You could also try to see if moisture content affects them. Try soaking them in water for a few days and see what affect that has on it.

[@ArmedAngryAtheist]

Maybe expose the concrete to fire for a set amount of time (5-15 minutes?) then crush it to see if it changes.

[@psidvicious]

It does. Exposed to fire, small pockets of moisture in the concrete boil and explode, spalling it badly. They just demo’d a bridge section of I-95 that had a tanker explode underneath it. Ruined the structural integrity.

[@samuelgarrod8327]

The giggle in science when you say it gets me every time.

[@bghoody5665]

Q: Name something explosive? Average person answers: TNT. Gasoline. HPC viewer answers: Concrete. Paper.

[@geekyzebra91]

I know here in the USA we use fiberglass in concrete, and depending on what it's being used for, you can get small rock or big rock concrete

[@teknologyguy5638]

The Eyes and Faces, very entertaining. Annie's reaction to the breaks is more entertaining lol. Should have had a picture in picture in this one 👍👍

[@dogbee]

This was awesome!

[@EXTREMOZAU]

A excellent vide ,and your coment so god i lern alit from this video i apreciate all your hard work

[@therealebolaboy]

I love the faces on the test cylinders.

[@patrickbelongea6896]

The fiber reinforcement adds flexural strength at the cost of a bit of compressive strength.

[@DUKE_of_RAMBLE]

_"The difference between doing science and just screwing around, is writing down the results!"_ -Adam Savage [Mythbusters] I think that recording it and publishing it on KZbin qualified as a fair analog to "writing it down". Therefore, EVERY video you do is a Science Video! ♥️😊

[@tomasclasson]

Awesome video! And "regular steel reenforcing things" == "rebar" ;-)

[@TheOfficial_InsaneStang]

I wish I would have thought about that when I was building supports for my bed when I was married to my ex…. These would have held her up better 😂

[@UnitZER0]

I miss the music during the slow-mo parts. The way the music drop was synced with the explosion was always awesome!

[@koreywilliams4570]

I recently poured my first bag of cement last week building my bench grinder stand. Leaned the difference between cement and concrete too.

[@rayodell8213]

I reckon the second one had a split personality 😮😅😂🤣

[@djkarcher1896]

Does your press have some sort of automatic safety switch off when something explodes in it? I've seen it turn off quite often, and by the way, I love me some good hydraulic press explosions, so I was very happy to see some in this video.

[@TheHitmanAgent]

2:26 When a friend asks: "How's your life?" My answer: "It is OK"

[@kingcodebra]

I run concrete and this video confirmed what I always suspected. Fiber doesn't increase strength like most people think, it just holds things together when it fails. And by the by, most floor concrete is 2500 psi, just for reference. Highest I've heard of was 8500 psi. The highest I've run is 6500 psi for underground forms for utilities.

[@johndododoe1411]

Europe doesn't use PSI for anything but tires . We use Pascals, bars and atmospheres . 1 bar = 100,000 Pa . 1 atm = 1.01325 bar = 101,325 Pa ≈ 14.7 psi.

[@psidvicious]

Concrete additives these days have got compressive concrete strengths well over 20,000 psi

[@florasakura3045]

In Asia, rice water was mixed into concrete. and it is said to be harder than our normal concrete. Also volcanic ash is said to be good.

[@TheSonshade]

Merry Pressmas!

[@tiredoldmechanic1791]

It's good to know that concrete can withstand almost twice what it's rated for.

[@Daniel-uj1nu]

A great video!! Someone should sponsor you a pane of bulletproof glass

[@TheBigNoize.]

very good and educational vid

[@Trancos1202]

Awesome video as always. Anna sounds so sweet and sad saying "Mister nice guy". XD Good video guys. Conrgats to you Laurie for all these good ideas,. And yeah, the fiber one looks bad ass. XD

[@chrisvydjap3695]

The first explosion shocked me so much 😂

[@simontist]

How about reinforced concrete? Columns often have axial and circumferential reinforcement.

[@HalvardSkurve]

Please make (small) square ones, with 90degree rebar corners (the rebar ends on top of the previous rebar), compared to 135 degree rebar corners (the rebar ends pointing into the concrete at the first/last corner)

[@Joel-st5uw]

"This is the tough guy" 😂😂 Love it!

[@SuperFkv]

Even i know it will explode, i still jumped up 😂Merry Christmas 🤶 Love from Denmark ❤