Testing the PSI of Wet and Dry Pour Concrete Slabs

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Testing the PSI of Wet and Dry Pour Concrete Slabs

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Full Steam Designs

Жыл бұрын

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@faraday9234 11 ай бұрын

3/4ths the strength is a lot better than expected. (Edit: Thank you for the likes, and for the people in the comments the context of the video is a backyard sidewalk.)

@borttorbbq2556 9 ай бұрын

Genuinely

@thisismyname1701 8 ай бұрын

fact

@tvviewer4500 8 ай бұрын

yeah but this leaves out the fact that the concrete isn't uniform and will crack accordingly if any decent load is put on it.

@faraday9234 8 ай бұрын

@@tvviewer4500 Yeah if its just a sidewalk why does it matter

@tvviewer4500 8 ай бұрын

@@faraday9234 If it's a typical 4 foot wide sidewalk - expansion from the sun will make the deficient mix apparent too.... You gotta mix for a reason...

@user-ez5ho2wl3r Жыл бұрын

Swiss hammers are designed to give very rough data to determine if any more testing is needed. Concrete core test will be the most accurate. And show how consistent the mix is. More than likely your dry slab will be stronger than what the Swiss hammer results are. BUT looking at concrete strength alone will not determine concrete quality. Yes absolutely your dry slab strength will hold anything you put on it. But it will probably not hold up to any freezing and thawing cycles that it is exposed to. Unless you are in a warm dry climate and don’t have any cold weather I would always go with a wet batched concrete to allow air entrainment to develop during mixing. To help protect against against freezing and thawing. I love the effort!! Keep it up! Concrete rabbit holes are always interesting to go down.

@BS-ys8zn 10 ай бұрын

Of late there is talk of the "discovery" of self healing concrete used by the Romans. And I wonder, how well does this concrete stand up to freeze thaw cycles as we here in Ohio gets more freeze thaw cycles in a month as Italy gets in a century.

@noahtackett6264 10 ай бұрын

@@BS-ys8znwell considering those Roman roads went into Germany and France I think it'll do decently in the cold

@HeadsDisplay 10 ай бұрын

@BS-ys8zn it was the added cook lime chucks added when pouring the water mix concrete. As the concrete cracks, it open the lime chuck to get hit by water/moisture in the air which would seal up the crack

@brendandor 9 ай бұрын

@@BS-ys8znItaly is extremely mountainous so plenty of areas get very deep snow in winter and plenty of freeze thaw cycles, however I don't know whether there is roman concrete on those areas. However it's not that relevant because modern self healing will be tested a lot before it's approved for cold areas (hopefully).

@zfolwick 9 ай бұрын

My dry pour slabs have been doing quite well so far

@ashlardarned2540 11 ай бұрын

I'd like to see compression and tensile strength comparisons of the concrete samples, as well as taking a cube of each and putting it through accelerated freeze/thaw cycles in the presence of moisture.

@rajulislam4687 10 ай бұрын

Yep totally agree from my own experience throughout my construction career I have had to fix many mistakes of other builders and some my own and have noticed jackhammering into dry pour is always giving less resistance than a wet pour

@TheeHamiltons Жыл бұрын

Awesome, can you do a couple cores as well and test psi on top, middle and bottom?

@Doomzdayxx 2 ай бұрын

No, that would debunk his test.

@bustersgarage 9 ай бұрын

Exactly!! IF you can introduce water balanced enough to catalyse the mix evenly, it would be relatively strong. But it's much more difficult for individuals to keep consistency while watering a dry pour form. Without strict control, this intruduces a greater chance of variation across the slab consistency. A person might have a dry center and firm exterior or a stronger slab with a powdery exterior with a solid center. Poorly mixing concrete batches in a wet pour can do the same thing. This is why in critical pours, samples will be taken in specific durations across the truck loads. Too wet/dry, too much/little entrapped / entrained air, post-pour hydration (wet cure) as well as ambient temperature being too hot/cold. I encourage people to experiment and see their results and work with what they have. It's concrete, so it can always be knocked back out. Also, a dry pour is handy for post fixing. You tested the external hardness, which could work well for domestic patios, but what I would love to see is the standard crush cylinders molds made and dropped off to crush. To get both consistency across 3 samples each, then compared results. 3 wet-pour cylinders and 3 dry pour cylinders created, not moved for 5 days- kept out of the elements. Then one of each crushed at 2wk, then 1month, then 3 months. - ACI Certified concrete tester

@rharris22222 2 ай бұрын

I would vote for standard beam tests, too. I know they closely correlate with crush tests, but I would like to see it.

@philhatfield2282 Ай бұрын

Why keep out of the elements? All that concrete will likely be used in outdoor environs, so exposure to elements is guaranteed. Test it how it would be.

@rharris22222 Ай бұрын

@@philhatfield2282 Because that is the fundamental approach to what we mean when we say "Science." It means a certain way of doing things so we can gather useful information from our experiments. In this case, there are all sorts of known effects from "Exposure to the elements." For example, if you pour concrete when it's really hot and windy, or if it gets really hot and windy during the curing period and you don't take special precautions, you end up with what's called "Drying shrinkage." If you pour concrete when it's raining or if it starts raining before the initial cure is set, you end up with a watery layer on top that flakes off, called "Scaling." I could name many more and I'm not even a concrete expert. The point is, what we want to test is NOT the effect of the weather during curing. What we are talking about testing is the construction method. So the proper way to do that is to eliminate as many of the other problems that you can between various tests. If they are all cured in a room at regular room temperature and with a normal moisture level in the air, you eliminate many of the other sources of strength variation and the ONE really important variation is the ONE thing you are trying to test. Also, "Keeping it out of the elements" is exactly what you do in real construction to the greatest practical degree. You DON'T just pour concrete on a hot and windy day and say "Oh well, it will probably be wrecked by excessive drying. Even on really large projects like highways, they have weather watches for rain, wind, temperature both hot and cold, they spray on curing compound, and often they cover with plastic or burlap for the first 24 hours, and even rewetting longer to assure good curing. In precast concrete beams, many are cured in conditions totally unlike what they will ever see in the field. The idea is to build strong concrete in the first place, and that means controlling the environment during the early curing process.

@Moe7133 Ай бұрын

I did a dry poor on my lawn next to my mail box because the mail lady uses her Vehicle and makes a runt on my lawn. I dry pour it with 6” deep and reinforce it with a mesh wire for strength. Wet it for one day and twice in the morning. I let it sit for another day to dry. The next day which is the 3rd day, I allowed the mail lady to run it over and it handled it well. It’s been 2 months now and it still looking good! I can tell you that it was so much easier than wet pour and I don’t have to rent a mixer or play with mixing it in a wagon. Just take it to location and cut, pour, rake to level, use a 2x4 to squeegee it, and paint roll it, then shower it with mist mode first follow by shower after 2-3 mist. I may do a walk way to my lake with dry pour in the future.

@mpgisbtsarmybaefighting2838 Ай бұрын

Hi question. Was your roller wet or dry when you rolled it please?

@Moe7133 Ай бұрын

@@mpgisbtsarmybaefighting2838 It was dry.

@callmeishmaelk767 2 ай бұрын

Dry pour is almost as strong as what it's rated for. That's great to be honest.

@callmeishmaelk767 4 күн бұрын

All depends on the application and how much you give a shit. I have a 10x20 section that is stone surrounded by concrete drive. I have no idea why they didn't pave this section. The concrete driveway surrounding it is only 2" and is holding up good enough and that area has vehicles parked on it. The area I want to fill will basically be foot traffic and garbage cans. I'm dry pouring and then skimming everything with new Crete anyway

@M4rio21 Жыл бұрын

I have been checking your shorts for a while now in anticipation of this test. I feel better about trying this on my backyard patio this week. Thank you sir.

@Henry_Swanson 11 ай бұрын

"I've been checking your shorts for a while now in anticipation"

@M4rio21 11 ай бұрын

Quick update, I did the pour and it was fine, except the edges were kind of terrible. I did a second dry pour with the top being mortar and it looks much better then the 80lb bag.

@M4rio21 11 ай бұрын

@@Henry_Swanson😅😅😅

@elsancho-mx7om 11 ай бұрын

He's wrong

@elsancho-mx7om 11 ай бұрын

@@M4rio21it's going to fall apart

@Dwohman 8 ай бұрын

I will stick with wet pour. With a dry pour, you have no way of telling if the concrete is completely set up throughout the material. You would have to do a core sample to get an accurate result. This would be like case hardened steel vs. tool steel. Tool steel is completely hardened. Case hardened steel is just hardened on the surface but soft at its core. I see very few aspects where you need to use a dry pour.

@Rheasound 9 күн бұрын

finally a proper test. thank you for your time to show us the data. cheers from FL.

@otallono 2 күн бұрын

this is stupid, the outer shell is hard, yea but it's not testing the inside which is very brittle, when you break one of these open (or when it cracks) it literally just crumbles like nothing

@KING-FU 6 ай бұрын

ASTM 39 is the standard used to test the psi strength of concrete by applying measured force to a cylinder shape of cured concrete and has been for over 80 years. That’s the test the industry and manufacturers use to determine strength of their mixes. Nearly 40 years in construction and I’ve never seen what was shown here to test the compressive “strength” / psi of concrete. JS The biggest problem I have with “dry pour” is the lack of control over the surface texture and porosity. The amount of finishing passes via troweling either leaves the surface porous (screed and float), or harder / closed by more troweling, which makes the concrete surface far more durable. Obviously if it’s simply placed dry and water misted over it, the mix and surface will remain “open” and more susceptible to wear.

@thomaslindsey7685 8 ай бұрын

The wet pour test must consist of the slump, which is the amount of water used and is a measurement of how stiff the concrete is when placed. Look it up.😊

@ChristianWagner888 9 ай бұрын

I would always do a wet pour. For small projects, like this pad, mix manually. For something a bit larger get a concrete mixer. For any large slab or driveway, get a premix truck with a slide or pump. Check the slump, also test your own mix quality with concrete cylinders submitted to a lab. I would not trust dry mix to perform consistently, but our own wet mixes have always performed as expected in tests and on site.

@FisherCatProductions 7 ай бұрын

Chris, Slump tests? Compression cores? Lad, we did that when repairing dams! I know you don't thing you think that is necessary for a chicken coop slab, so I'll assume you, like most pros, are completely missing the point. Envision, if you will, a DIY couple that has never so much as built a picnic bench. (Call to the local batch plant) "Send me 2.75 yards of 3500 psi, and we're gonna' wanna' 4" slump. What? Do I have somewhere to dump any leftover? Why would there be leftover? Unh. Have to grade the base, huh. I did--sorta'. Better make that 3.25 yards. What? OK, make it four! Don't wanna come up short! Huh? Uh, no, you can't get that close. A wheelbarrow? I can get one. Of COURSE I can push it. I'm in good shape for 72! 800 pounds? Really?? I'll get a little wheel barrow. Who? Oh, it's just my wife and I. First time for everything! Of course I got a screed, I ain't no dummy. What's a float? No! A trowel?? For what? I told you I got a screed! No, I don't wanna send a sample to the lab!! Are you laughing?" OK, THAT guy can dry pour a slab for his chicken coop, dumping bags from his pickup, with a 3" PVC pipe screed, and a garden hose--and have FUN doing it. If he comes up short, he grabs a few more bags. Any "leftover" he takes back. If it takes 3 days, it takes 3 days. It will outlast him and his chickens. And he done it hisself! Yup.

@mandowarrior123 Ай бұрын

@@FisherCatProductions why can't you just dump the water in and mix it there? True comparison is a half arsed mix vs a dry pour I'd think. The thing that shocked me when I had a slab poured, I asked if they do waterproof concrete for my subfloor and they said, sure, but it's expensive- but it was pennies more and meant no tanking or anything needed. My dad's a chartered builder and we hired a bunch of young landscaper muscle in winter to wheelbarrow it in a rota. They were exhausted but the concrete guys were happy. I'd go for a mixer delivery every time- they even have ones that it only puts in the water at the end now so you can even deliver to old gerald for his chicken coop and doesn't bugger a mixer.

@Mars-zgblbl 10 ай бұрын

Ran several hundred Swiss hammer tests against compressive strength of same cylinders. The correlation coefficient was well below 0.5.

@sonofasosa4592 Ай бұрын

Appreciate the no fluff approach you took!!

@93rgratz 10 ай бұрын

The issue isn't the surface hardness it's the consistency through the slab. You will have places that don't go through the full chemical process and it will create weak points. Don't waste your money just mix it

@RichardSmith-ir7rp 8 ай бұрын

I agree with @93rgratz. When it is mixed homogeneous, it will be more consistent throughout the entire slab. Home owners can certainly get away with this because they're only held to their own standard. The question has always been whether it was as strong. Now consider how well a dry pour will bond to rebar compared to a homogeneous mix???

@riccochet704 8 ай бұрын

Concrete is porous. It will wick ground moisture and fully cure over time. This is why you can dry set fence posts without adding any water. There's enough moisture in the dirt for the mortar to absorb and set. If you keep watering a slab it will 100% set and cure.

@savagememes873 8 ай бұрын

yeah you can mix it anywhere. like a bucket or wheelbarrow. that's how the discus posts here in my city where concreted in. that's how all the posts on the hicking track are concreted in. we just mix it on spot in what ever container we can.

@savagememes873 8 ай бұрын

@@riccochet704 no that's not how it works att all... the reason some idiots dry pour fence posts is because they don't have to be that strong and nobody cares if they crack as they are not that important. but it's still extremely weak and inferiour to mixed concrete. you have to mix it for it to cure and set properly otherwise it will have weaknesses in it and will crack prematurely.

@Josh.1234 7 ай бұрын

I don't believe this test really shows the overall strength of a slab. It may test a point for its PSI but it can't tell what deflection that slab will take before breaking apart. And that could even be under it's own weight. Things can be hard but not necessarily strong.

@MrBoshell. Жыл бұрын

You need a crush test, or we know it as a cube test, I’ve never seen a PSI test done and can’t really see what benefit it has, only a crush test will tell you if the size stone + cement + slumb (wetness) will hold up

@TheeHamiltons Жыл бұрын

Will tune in for the full video on this type of follow up

@ChristianWagner888 9 ай бұрын

We do 2 or 3 standardised test cylinders. 6 inch diameter, 12 inch height, for each pour. A nearby engineering lab does the crush test. We never failed a test.

@jsh3234 8 ай бұрын

Basically there are some that will just take the easy way out.

@reedsilvesan2197 5 ай бұрын

There's several parameters that determine the strength of concrete. 1. The amount of cement that is put into the mix. Most concrete is 5 sacks to the yard. Government standards are a minimum of 6 sacks per yard. 2. The amount of water is also important. The water in concrete doesn't evaporate, it stays in the concrete forever. The more you put in, the weaker the concrete. 3. Temperature during the hardening process. Keeping the concrete cool during the curing process will increase the strength significantly. However, Don't ever let it freeze, it will be garbage.

@varok1206 7 ай бұрын

Wet pour is 10% as strong as concrete with caged rebar. Do you need "that much?" You use what is in scale to the project demands at hand. Whichever you use....rock? Dry pour? Wet pour? Reinforced pours? Make sure your yields supports what tasks it needs. Good video

@davidhenderson3400 10 ай бұрын

The first thing I noticed was a color difference between the two

@robertopics 8 ай бұрын

And thickness

@stephenbrooks9196 2 ай бұрын

I don’t have an elephant crossing at my house😂😂😂…. I just need to repair a section of my walkway that has become a trip hazard until I can get the entire walkway done and a dry pour just seems like a quick temporary fix….

@cameronpetties9768 8 ай бұрын

Learned about this tool in my concrete class this semester! I failed my ACI written exam but plan to retake it in the spring time.

@papito8032 26 күн бұрын

Dry pour reading on swiss hammer holds 3625psi. Well enough for a residential back yard slab. The numbers dont lie

@insaneTrout 10 ай бұрын

Well. I think it comes down to people doing it correctly. I am sure there are people who cannot/do not do a dry pour the same as the people who cannot/do not do a wet pour correctly. Though a wet pour is a little harder to mess up ( not impossible) so which ever anyone choses to do they should do some practice sample runs first

@mudslutmusic9052 11 ай бұрын

A Windsor probe or a core sample compression test would be more accurate

@DeruUeruddo 10 ай бұрын

Who needs accuracy when you've got a difference like that. Besides, we all know that unconsolidated dry pour is going to have a much higher air %. Which = less strength.

@Sovereign_Citizen_LEO 23 күн бұрын

The question is this: What is the long term durability of wet pour vs. dry pour. I guarantee you the wet pour will be much stronger, for much longer.

@Shannonveganmama 6 ай бұрын

Thanks for doing this!! As a single chick, dry pour seems a lot more managable for some hardscape plans I have this summer.

@Ransetsu Ай бұрын

It'll break in a few years.

@Jais271 Жыл бұрын

Awesome dude. Thank you!!! Can you cut them in half and test the center?

@FullSteamDesigns Жыл бұрын

These are the other half’s that were left over from the larger slabs I cut in half. I drove over those pieces and smashed them with a hammer. Check out the other videos

@3Hose Жыл бұрын

@@FullSteamDesigns This has been an interesting distraction for me. When my mind wanders it goes to solutions or how to try the next thing. Recently my mind went to packing the concrete mix with a vibratory flat bottom packer. I noticed that wet pour condenses the material down to a lesser volume than the dry mix. It would be interesting to see if packing it would make any difference in strength. If you do any more tests I would love to see the results. So far so good. I appreciate the time you put into supplying this info for the rest of us out here.

@the-house-of-flying-knives Жыл бұрын

Great work, bro. I'm a big fan. Keep it up 💪

@jakel.1724 7 ай бұрын

wet ground in frame. pour concrete dry. half way. water it till saturated and dry pour finish normal. bet it would be 90%.

@Hellsong89 7 ай бұрын

... still would recommend making wet pour since you never know if you want to do something else with the area and slab.. even if its just 1/4th difference, it matters when you push the limit.

@sjgmlg 9 ай бұрын

Been doing mud beds for over 30 yrs dry method in showers with bagged sandmix. Just add water when your pitch is close and then get your pitch perfect and add water again. Eliminates premixing of mud bed outside of shower, much easier and a lot less labor.

@EFD620G 11 ай бұрын

The problem is that few people mix the contents when dry pouring..

@tolgamatouk7206 8 ай бұрын

If bearing strength doesnt matter then a dry pour can work. I wouldnt do it as a concretor because its just problems waiting to happen. If youre driving a car or anything like that on it this wont be any good. Dry pouring concrete is only good for certain applications, and even then its not always the best solution just easy and relatively cheap. If youre using dry pour it will work better if you compact it while its slightly wet

@billsmith9234 8 ай бұрын

thanks for the result. Numbers look pretty good !

@user-mh1js5ud6f 7 ай бұрын

I do concrete and i only dry pore fence post, mail boxes, things that wont bare much weight or you cant see them.

@mydraftable6526 2 ай бұрын

When I do fence posts, I put some water in a bucket and then add the concrete. By the time the hole is dug the concrete is ready. Just tip the bucket and you're done.

@howlingcommandose 10 ай бұрын

Patio of a slump of 5 doesn't need more than 2500 psi. Truth is at 3600 psi with fiber, webbing or rebar you can drive or park on it.

@lunarmist428 8 ай бұрын

But for how long ? That's where the strength comes in. The turning of the wheels can eventually cause problems imo.

@dthorne4602 7 ай бұрын

This test only reliably shows surface characteristics. a 3 inch slab has variable curing all throughout, especially dry pour.

@howlingcommandose 7 ай бұрын

@@dthorne4602 no argument with that, but since I mentioned slump it wouldn't be a dry mix.

@codyreber8370 2 ай бұрын

That extra 25% strengh is important to me. Also so is rebar. I break things, if you think i cant accidentally break a slab, youd be wrong. My work experiments have damaged steel plates

@rich7934 10 ай бұрын

Wish you had mentioned how old the concrete was and what the weather was like. IMHO 1 month minimum during rainy season (1"+/week of rain average) to make sure all the concrete has reacted and cured. During dry season you would need to spray down twice a week.

@user-yz8hn2fm2b 11 ай бұрын

As a Journeyman Cement Mason I think that you're allowed to do whatever you want as a homeowner. If you think you're saving a ton of money by avoiding professionals and "dry pouring", go ahead. But there are a host of issues that come with not properly mixing concrete. If you don't care about quality this is the way to go! These videos irritate me as someone who's in the industry, but hey to each, their own. You should try making a cake without mixing the batter and let me know how that goes. Might get something close but it's not what it was meant to be. WHY SPEND THE MONEY ON CONCRETE AND USE IT THE WRONG WAY?

@titanofgames7988 10 ай бұрын

Dump cakes are pretty good

@WoodGrinds 10 ай бұрын

these type of pages keeping work going around for all us professionals into the future. a bunch of “well i thought i could fix it after i watched this one video that made it look easy” clients.

@outman6207 9 ай бұрын

WHY? because concrete is CHEAP, Labour is ridiculus expensive .....

@jcfra420 9 ай бұрын

I have poured as a homeowner, it amazes what people will do to get out of a little work lol. It is not that much effort to mix concrete. Even if it is a small pad, it is very cheap to rent, or even purchase at harbor freight a drum mixer.

@crafterlula1328 9 ай бұрын

As an Apprentice Cement Mason, I think you're totally missing the value of this man's advice! If people follow this guy's advice, it'll lead to more botched concrete projects that we'll have to fix. THINK OF THE MONEY WHEN PEOPLE REALIZING THRE'S A REASON IT COSTS A FAIR BIT!

@Chris-ev2ih 9 ай бұрын

Okay I’m just throwing this out here because I slightly remember reading about it. But alot of the old Roman concrete buildings that are still up today had dry- un mixed concrete in it. Whenever the concrete would crack the dry concrete would weld repair the crack with the outside moisture. You can fact check it, I’m sure I’m wrong on somethings but I do remember that part and thought it was interesting

@Chris-ev2ih 9 ай бұрын

*self repair

@DeuceGenius 6 ай бұрын

Their concrete is still around because it was like 10ft thick solid concrete.

@CCoburn3 Ай бұрын

It always depends on the application. Do you need to handle lots of weight (e.g., for the foundation of your house)? The wet pour is the way to go every time. Are you using it to pour a little slab at the back door to keep muddy footprints out of your kitchen? Dry pour is fine.

@bbwitching 8 ай бұрын

Thank you, this is a valuable comparison for DIYers!

@shawnd567 Жыл бұрын

So it's 20% stronger to do a normal wet pour. Going to do wet.

@Scott-ib3tm Жыл бұрын

My takeaway is - so the payment for a massively easier undertaking is only a 20% reduction in psi - SOLD. Going to dry pour my shed base now for sure. It's for parking mowers and storing rakes and cushions, not holding up a semi.

@rawbacon Жыл бұрын

The test has a 25% plus/minus accuracy and he's only testing the surface which is where the water enters from, meaning the mix is different from top to bottom.....The middle could be dust and that thing won't detect it.

@AveragePicker 11 ай бұрын

@Scott-ib3tm Except it's not "massively" easier. Maybe for a small square patch you can reach across, if we ignore you have to go out and keep checking and watering it. I'd much rather level wet.

@electronicsandewastescrapp7384 11 ай бұрын

@@Scott-ib3tm great for tiny projects.. but a lotof projects it's silly to buy a bunch of relatively expensive bags vs. having a truck come in premixed. Huge time (and back) saver if you're time is worth money...

@kickpushlongboards 9 ай бұрын

Plus it only takes like 60 seconds to mix a bag of concrete? Maybe 2 minutes? And you could even mix it in the dirt hole and get a 90% mix instead of 0% mix

@esexavo 10 ай бұрын

Lol i am a concrete contractor this is just too funny , bro you all should do your drive ways like this no lie, i love redoing driveways

@bigrig0625 9 ай бұрын

He didn't recommend doing driveways like this did he? He said it could be utilized for small projects around the house. Get over yourself, Mr. expert!

@esexavo 9 ай бұрын

@@bigrig0625 please every should pour like this. Its super cool, just call when you need to replace any concrete guy will do much better job, get over it little brokie

@bigrig0625 9 ай бұрын

@@esexavo No use explaining anything to someone with your mental capacity 🙄

@esexavo 9 ай бұрын

@@bigrig0625 says the man that believes this to be a legit option, your iq matches that of a dead pal tree in the summer

@c172215s 9 ай бұрын

Hey As a professional I redo other professional's crap all the time. Being a professional is meaningless nowadays.

@user-hc6kd6kr7n 3 ай бұрын

Maybe, I wouldn't use it because in my area the ground moves/heaves or ground swell every year. Maybe it's ok for livestock areas or small sheeds. Even a dry pour sidewalk or patio would crumble in a couple years around here.

@brianburnside5949 6 ай бұрын

I'm sorry, but that tester is only useful if the concrete had a uniform mix and set up properly. A dry poor is not uniform in the least so surface readings don't tell what is going on underneath.

@neomacchio4692 Жыл бұрын

Boom… love it when someone reveals the truth about something… anything!

@jsraadt 11 ай бұрын

A sample size of 2 does not determine the truth

@mydogatemyhomework3768 11 ай бұрын

@@ricknmoorte1498 with a Swiss hammer 😅😆🤣. Drill a core sample son. Then you will see the "truth" in those tests.

@elsancho-mx7om 11 ай бұрын

He's wrong....

@SuperMultimitch 10 ай бұрын

This is not an appropriate test for the application

@user-gx1yz8ny1l 9 ай бұрын

Boom another dumb

@davidv1219 11 ай бұрын

Nice job man. Useful conclusions based on real numbers. Very thorough. Great video

@n.gineer8102 8 ай бұрын

He clarifies “for homeowners” to use which means minimal loading where 2000 is more than enough. Pavers, fence posts, patios, bbq pits etc = no problem. Not for footers for decks and patio covers.

@jawms 7 ай бұрын

Flip that block over and test the bottom. Then crack it in two and test along its whole thickness. I don't think that your psi measurement will be consistent throughout. But the wet sure will be.

@ArFadez 8 ай бұрын

As an American concrete aci certified concrete field tech, you need break tests made in cylinders that get crushed in a lab to get a real idea of concretes strength.

@david21968 8 ай бұрын

Why not just mix it. This is how it has been done since Roman times and yet some lazy homeowners think they can cut corners

@maitaimaitai4046 15 күн бұрын

Maybe cause it's easier on people pockets, time, etc to do it dry themselves. And "think they can", they do. Everything is used to divide people, just take his test as it is and move on. Why call others lazy, etc. Something is definitely wrong with you.

@oneskydog6768 14 күн бұрын

If it meets the requirements of the home owner it is a quality job! Perfection is the enemy of production. Manufacturing engineer everything from rockets and satellites to golf clubs and bicycle spokes. Requirements vary depending weather you are working on an ICBM or your garden. You should have seen the crap the brown people mixed to set my one block wall on next to the ditch. In AZ.

@pulsefel9210 7 ай бұрын

as long as the water can get to all the cement in the concrete it wont really matter. air isnt the main thing, its the reaction.

@markusgeimer3099 8 ай бұрын

Im so glad you did this test because ive always wondered the ACTUAL difference

@7Inkredible7 Жыл бұрын

Dry pour appears a lot easier. Gotta try it on my driveway path project.

@josepascasio3793 10 ай бұрын

For the love of God, please don't do this if you're gonna drive over it or if you live in a state that goes through freeze thaw cycles.

@7Inkredible7 9 ай бұрын

@@josepascasio3793 neither will be an issue. Im going to just walk on it. It's a sidewalk path connected to the side of my driveway. And I live in Texas.

@josepascasio3793 9 ай бұрын

@@7Inkredible7 perfectly fine then👍

@washedrazor 11 ай бұрын

As an engineer who has never heard of the dry pour method, I like this

@zedwpd 11 ай бұрын

Go watch Country Cajun Living

@user-gx1yz8ny1l 9 ай бұрын

Go to school again

@drewclendenen1848 8 ай бұрын

@@user-gx1yz8ny1l no sir do not send him back to school, what he needs is some real life hands on in the field training, seeing all aspects of the work involved in the project he is designing.

@chasecrallie2557 6 ай бұрын

I don’t know why we are simply looking past that the dry pour has no entrapped air, and if you live in a climate that drops below freezing at any point, it will be pulverized by freeze thaw

@psyience3213 7 ай бұрын

The dryer the mix the stronger the concrete, only problem is dry pour your not mixing it up and making is super consistent

@davidblalock9945 9 ай бұрын

Honestly, back in Washington we never bothered to even wet the concrete when pouring pilings for pole structures. The moisture content in the soil was more than enough to activate the concrete. We’d just make them half again the depth we needed and call it good.

@FisherCatProductions 7 ай бұрын

Our surveyors always used wet 'crete to permanently set their pins. They were very skeptical when we helped by setting them in dry Sakrete as they went along. They were believers when they had to move a few of them a week later, and had to bust them out with a sledge hammer.

@ckotterman 11 ай бұрын

Pretty straightforward. Dry pour is probably fine for a lot of things. But wet pour is going to be more consistent throughout by nature and therefore probably better for "harsher" conditions. But you don't need perfect concrete for most small home projects in non-extreme weather. Good stuff.

@airflowfpv7791 9 ай бұрын

If you want it to still be there in 5 to 10 years without needing replaced, you are doing yourself wrong, trying to dry pour a 4 in. or thicker pad. It will not hold up. Maybe, sometimes under perfect conditions, people will have good luck, with it sufficing but it is definitely a toss up and is equivalent to not having the clay and limestone mixed properly before calling it Portland Cement. I mean you can cut a hole out of a shoebox and call it a birdhouse too...

@MonkeyDelicious 28 күн бұрын

You can see the quality in the concrete.

@JohnSmith-hr5xx 7 ай бұрын

I have set posts and dry poured footers for decks many many times. Just pour in the hole dry and then easily pour half a five gallon bucket of water on top. After it drinks it pour another half a five gallon bucket on it. It's plenty strong for that kind of job. If your going to build something heavy then definitely mix it with a shovel in a wheelbarrow to wet pour. On a small patio or slab I mix water into it with a hoe right on the ground and just work it as I go. Anything big call a contractor. I wouldn't use bags on say a driveway or house footers ever.

@williamalston3324 Жыл бұрын

Nice! Science!

@SophiaAphrodite 8 ай бұрын

Only concrete contractors said it was low, or move the goal posts to protect their industry. No one is dry pouring a driveway.

@mandowarrior123 Ай бұрын

With all due respect, cement mixers are cheap, and you can mix it with a shovel. On the flipside, you can dry pour a driveway just fine. Concrete contractors have enough industrial scale projects to 'protect their industry' where sprinkling water for many days is too much work when wet mix goes off in a few hours. The ones with opinions have seen it fail, as freezing is usually a big threat to dry mix. If buried as a post it never freeze cycles, and has minimal force on it. It's a bit of a waste of money not to mix it in my opinion, but its your concrete. Also you get more blowing about, concrete powder can blind you and cause lung diseases, so be careful with it.

@seetheworldfrommyharley Ай бұрын

@@mandowarrior123 well said

@dusannestorovic5699 7 ай бұрын

From my experience, dry pour is good enough for sheds and patches of concrete in the back yard to put your grill on top of

@slavi7191 8 күн бұрын

Thank you for the info

@archael18 9 ай бұрын

If dry pouring was a thing, the manufacturers would put those instructions on the bag.

@maxgood42 9 ай бұрын

I don't think they would recommend something that could be misinterpreted, as this could lead to legal issues. There are good ways and bad ways to dry pour.

@archael18 9 ай бұрын

@@maxgood42 The only good way is fence posts that are always in the ground. Anything else is just a poor reproduction in comparison. It may hold what you ask of it but it will never be as strong as it was meant to be.

@maxgood42 9 ай бұрын

@@archael18 Yes application matters so if a bag had dry pour instructions on it then this maybe used in a way that it would not be safe, so yeah fence post or light traffic areas in less extreme environments and loads. But not if you need it to spec. Also the way it is watered can have different results.

@user-jo3ug9ov1v 9 ай бұрын

Hahaha just so they could charge you more lol let's not lie here the whole dry pour thing is just a marketing campaign they have been fairly honest on so far... By honest I mean not saying anything about it

@jds2048 8 ай бұрын

Unless the government is listening in on your bathroom visits.

@nickbono8 10 ай бұрын

Dry pours are just fine for post setting for fences and that’s about it.

@christianlassen1577 6 ай бұрын

it's the having to come back every 30 minutes to re-wet it, for a few hours, that's the deal breaker for dry pouring. pour, smooth, maybe check on it a little later to touch it up, leave it alone, easy

@jaybrooks1098 8 ай бұрын

Dry pour is likely more brittle. Dry pour is good a few jobs I’m sure. The concrete bricks look like compressed dry pour methods were used for instance.

@Edpo26 Жыл бұрын

I just did a 10x10 slab this past weekend. Came out amazing.

@mydogatemyhomework3768 11 ай бұрын

Wow. How many bags did that take?

@ronblauvelt7457 3 ай бұрын

Concrete laborers will always tell you something that takes money out of their pocket is wrong

@adorable6385 8 ай бұрын

Thank you sir keep up the good work

@Hardworkingman870 6 ай бұрын

Do this test place 1 gallon water in 2 each 5 gallon buckets now add 1 dry bag concrete mix in one in the other mix 1 bag as instructions place in second bucket top both with water let sit 1 week remove each and test you will be surprised

@ArcheWhatzitGonnaB3 11 ай бұрын

What is the debate between these two methods? Isn't dry pouring worse in every way? Doesn't this PSI test only test the top layer? How reliable is it to soak concrete several times just hoping that everything gets wet and forms solid. I can't imaging this dry pour method is reliable at all anywhere the ground reaching freezing temperatures. I'd imagine if water is able to soak through the dry pour method enough to wet most (if not everything) then rain and whatnot could also soak in to the cracks, freeze, expand, and destroy the slab very quickly. Dropping a hammer or something on it too, the solid slab should displace the force and result in chips and whatnot, while the dry pour method would theoretically not displace the energy evenly, resulting in cracks right? It just seems assbackwards, you wouldn't put cake mix into a pan, spray it with some water, and bake, that'd result in a dogshit cake that's not cooked right.

@j-bob_oreo 8 ай бұрын

never heard of a dump cake ? no mixing

@ArcheWhatzitGonnaB3 8 ай бұрын

@@j-bob_oreo Nope, wouldn't consider alternative concrete mixing practices as common knowledge either.

@billsmith9234 8 ай бұрын

You need to Make you own judgment on this. No one said dry pour better. But dry pour saves you a lot of back breaking labor . If it's just a basic back fill job say thing like raise floor 2in for laying tile . Is that really necessary for me for put in 2-3X extra labor?

@Daniel_Roach 8 ай бұрын

I dont understand why people will argue about a shortcut somehow being better than the intended method.

@ryanjones9305 11 ай бұрын

Loosing 1/4 of the strength is ok? Why use concrete at all then? Maybe use some 1x3 wall studs in your house framing since it’s probably strong enough to withstand most things. It’s certainly be lighter and easier to put up.

@FullSteamDesigns 11 ай бұрын

Sure

@danielakers9711 8 ай бұрын

to get proper accurate information you need to test four samples of each in test cylinders in a lab under controlled conditions with a machine designed to test concrete compression strength

@bigbadbamboo1 10 ай бұрын

I dry pour posts and sidewalks. Quick and less labour costs

@savagememes873 8 ай бұрын

no it's not because there is no added labour cost to wet pour. you can litteraly just mix that shit in a bucket in just a few seconds and you get a much better results. there is no application for dry pour because there is no added labour to wet pour while wet pour is 100x better meaning you are actually wasting time and energy on a interior result.

@sethdewey2121 5 ай бұрын

@savagememes873 no added labor to wet pour? Your joking right? Yea you can just mix some water in a bucket but do that 47 more times to get the amount of concrete you need for a project vs just dumping the bag an screeding it an tell me it doesnt add more labor lmao

@jaredliftz Жыл бұрын

Liked before you even tested it

@PaxHeadroom 8 ай бұрын

I simply don't think saving 16 minutes of mixing in some water and pouring a slab is worth a 20% reduction in the strength of the material, especially considering we don't even know how it will weather. The cross section of the dry slab revealed a lot more air inclusions that might allow more water into the slab to freeze.

@derekwirth2162 Ай бұрын

The real thought is there are too many variables to get those dry pour results and consistent strength throughout the slab. I'd be curious what the strength is on the bottom of the slab and material up against the forms. I'd never do dry pour personally or promote it.

@praticalorigami 11 ай бұрын

It's like cooking a steak in a toaster. Do it the way it's done and you won't have any unexpected problems.

@mexicaninjafredfred 9 ай бұрын

Whats the point of testing anything then? Just do everything the way it's always done forever and never learn anything new you seem really clever and creative and fun 😂

@alexmccart2566 9 ай бұрын

@@mexicaninjafredfredgoing the lazy route isn't trying anything new. I'm sure dry pouring has been done hundreds if not thousands of years ago.

@mexicaninjafredfred 9 ай бұрын

@alexmccart2566 you don't get it aquafps would be disappointed

@Junior-zq2ls 9 ай бұрын

@mexicaninjafredfred do what you know, not what you're told. You will save money.

@Junior-zq2ls 9 ай бұрын

@mexicaninjafredfred you are going based off of opinion, not fact.

@nilsschear1095 Жыл бұрын

So dry pour produces weaker concrete. Got it. Is anyone surprised? Now I want to see how it holds up in multiple freeze thaw cycles.

@Scott-ib3tm Жыл бұрын

Not surprised but happy to have science rather than emotion to go on.

@WlfLLC 6 ай бұрын

I appreciate the test. As I have used dry pour to direct water into my drain properly. Thinking about it for other locations but wasn't sure.

@TomJG23 8 ай бұрын

Strength aside the wet pour looks way better. If your doing work at your house do it right.

@FullSteamDesigns 8 ай бұрын

Sure. They both look pretty bad since neither was finished.

@drewski_1 Жыл бұрын

Lets go, dry poor with another W

@cameron538 8 ай бұрын

Of course the surface is going to be fine, how's the core?

@sambennett5828 8 ай бұрын

Cool to see some real science! Thanks!

@Ham68229 7 ай бұрын

I've always preferred wet pour for the fact, you ensure you get a solid mix vs a dry pour.

@mexicaninjafredfred 9 ай бұрын

The man could say " for small home projects" 9000x times in this video and mouth breathers would still complain in the comments i swear concrete guys must have a hole in their heads 😂

@ebenezerwheezer2957 Жыл бұрын

I'm waiting for all the wet pour trolls to come out. Not understanding situations where a dry pour is more viable and convenient than wet pour.🍿

@Ethen1066 10 ай бұрын

Test the underside of the slab as well, the top might be fine for compression, but if the bottom is weaker the tension will crack it

@FullSteamDesigns 10 ай бұрын

There’s no point in trying to test a rough surface with this tool. The readings won’t be reliable.

@DanielGalland 2 ай бұрын

A surface test? Where your testing probe can be placed on individually hard aggregate which would skew the results? Instead of an overall crush test which would give you the actual PSI?

@WhiteoutMonster 11 ай бұрын

You need to go tell that one guy that just can't get over the fact that dry pour is inferior. I made him mad yesterday it seems.

@rehamkcirtap 7 ай бұрын

In most cases I'd mix it correctly based on my specific application. But I was a concrete guy. For average america those will be all right if you're not anything structural

@willkincaid5841 8 ай бұрын

Best way to do it is use test cylinders we had measure the slump and take at least 3 cylinder samples. The cylinder is plastic or pvc, i believe they are around 4 inches wide and around 8 to 10 inches tall. Now they do make bigger cylinders for sample tests. Id do whay you do and take it to a company that will take those cylinders and they will test them under a hydralic press. Just a thought id like to see it.