Why did this concrete crack?

Poured out a garage floor and it had a crack in it the next day. We put relief cuts in the floor the same day but concrete has a mind of it's own and it does not care about your feelings.

[@randymyers5086]

That's a shrinkage crack! Dryed faster there than the rest. The way it sticks out ,that's why I still use burlap on my jobs. Cover the whole job with burlap wet it down and keep it that way for 48 hours. I get no cracks.

[@1radkill420]

Wet cure for a much stronger and more consistent pad.

[@fhuber7507]

I've seen them allowed to just start turning grey in spots, then water spray and cover with plastic. Seemed to work for that concrete crew. It's all about preventing the surface from drying before the concrete gains enough strength.

[@exploranator]

Well, I just learned something!

[@ed1pk]

Plastic shrinkage. Tyler Ley has great videos on it. kzbin.info/www/bejne/jIaQpX2dic6nm6M

[@KingSobieski]

I never had any concrete crack on any garage floors before. I also haven't poured any either.

[@noway2708]

Champ

[@bondobuilt386]

awesome. lol

[@butopiatoo]

Amazing how there are little details that can escape even a pro, though obviously you made an adjustment that should minimize further issues. Fascinating.

[@bondobuilt386]

Thanks

[@maddycakes9573]

You needed expansion foam on each side of the service door block out. When the concrete wanted to shrink I was tied in to hard in that area.

[@montanagrant4757]

When it cures it becomes dehydrated. Why not give it a top layer? Then clean it up?

[@bondobuilt386]

Thanks

[@montanagrant4757]

Also tell them about finish. You do have a crew for that

[@skliros9235]

Or put a piece of cardboard on each side of door, so the concrete can slide in as it shrinks?

[@jessedukelacrosse6470]

Na, these men scored it just fine , they got mesh down , expansion foam will only make the homewoner call you back every year to redo the mastic, if it was a swimming pool copping fine , better to have to replace mastic other than have to repair pool tile or plaster lol , we use expansion board , basically cardboard or compressed pk paper boards , even those give out over time

[@approots]

In our area, building inspectors want the slab over a foundation at the openings as you have here. Seems better to float the slab over the fill so it can settle as a unit, especially with foam under the slab which will increase settling. I poured 3 slabs at my house all with rebar 16" centers and the only slab that cracked had foam under it.

[@bondobuilt386]

Yes I have noticed these foam under slabs want to crack.

[@MegsCarpentry-lovedogs]

Quite the team work and everyone has to know what their job is to make this successful. I appreciate the explanation. One really gets to appreciate what concrete work is about. Cheers East Canada.

[@bondobuilt386]

Cheers to you as well Thank you.

[@jimanderson4495]

Thanks Ron. On to the next one and keep ‘em coming.

[@bondobuilt386]

You bet uncle Jim. 😊

[@noway2708]

Im pro 30 yrs, if you dont want surprize cracks, dont cut the control joints the next day.

[@bondobuilt386]

I did the cuts the same day we poured with my soft cut. went back the next day to add cuts across the doors because of the crack.

[@georgemckenzie2525]

I appreciate the honest report.

[@bondobuilt386]

glad you liked it.

[@patricklucero815]

So I have had that happen before and i found if i either have some sand or some sill seal over the foundation wall to prevent bond so that when it shrinks from curing the slab is not bonded at the openings it does not crack. The fact that it cracked right away telks me that that is what happened. Structurally sound just looks bad. Nice work.

[@dunep6465]

Job looks good Ron. That mud in the door cracking just looks like shrinkage, not settling. Just my two cents. Throw some epoxy to it and forget it. Sh-t Happens.

[@bondobuilt386]

Thanks that's what I was thinking

[@tedwilliams8766]

we always put a couple pieces of rebar across corners of doorways to help with the cracking. pouring on plastic/foam isnt fun to begin with because the only place for moisture to go is up. definitely got to be on your timing or youll be chasing that floor till its burnt. ive finished floors we poured on windy days on foam, against my protest, and watch the floor crack as early as 2nd hit and surface cracks open up before i even started machining. ive always dislike pouring directly on plastic/foam. what used to be done was the foam, wire mesh and pipe was buried under 4-6" of sand and we never used to have problems with cracking but then again mud was different back then. where i live, we hardly ever have bleed water because of all the chemicals they use which i think is part of the cracking issues.

[@bugtusslealien3931]

Why do use wire mesh when you just leave it lying flat? The mesh needs to be positioned in the middle of concrete for reinforcement. It's used to hold random intermediate cracks tight. It's sort of counterintuitive to your title!

[@bobjoatmon1993]

He explained that

[@YAWN....]

Shuddup fool. Watch the vids with your eyes and ears, sheeesh...

[@samsson6430]

First of all, use rebar instead of wires. Next, water the dried concrete. Lastly, don't cut corners.

[@trevordavis2760]

I wish someone could explain why in the USA everyone likes to sink their flex tubing at the bottom of their floor! Makes zero sense!. Pour the floor, 2 3/4 (min) lower then finish grade. add your tubing, pour gips type top coat. If you need to add a cut, cut it before the gips is pour, good to go. If your heating tube has issues, you only need to destroy the top layer. Just doesn't make sense to sink the tubing.

[@mrmotofy]

Cuz thin concrete doesn't work. 4" is the minimum slab thickness

[@trevordavis2760]

@@mrmotofy sorry but you are wrong, thin set works and a lot of homes in Germany use it. They pour their base first normal around 6" to 8" with a min of 2 3/4" thin set to cover the tubes. Most homes in Germany is made out of Concrete of some sort. I stand be this, all serious Concrete workers should come to the International Build show in Germany to see how to build! Before you say anything, I grew up butchering wood, making Cabinets, laying flooring, and doing a lot of concrete! I've seen the difference in a lot of countries. If I ever move back to the USA I'd either build with ICF or Kodiak Steel.

[@jameshines6486]

Lets face it. Concrete cracks. Vibrating your concrete minimizes this.

[@o_lakisgavalas]

with a good 15cm of concrete on top of the underfloor heating pipes, they might as well turn on the heat today to be ready for next winter

[@quickdeuce]

Re cracks in concrete. One time I had a customer tell me they wanted m to 'guarantee' a slab for their slab on grade house would not crack. I told them I would GUARANTEE IT 'WILL CRACK'. I continued to mention however that I would do everything the ACI recommends to 'control' the cracking but to guarantee a slab would 'not' crack was gonna be a NO.

[@bigal25938]

Need rebar instead of the wire plus the steel is on the bottom and won’t help the concrete at all. The steel needs to be up about a third of the thickness of the concrete. Did you keep the concrete damp while it was curing? Spray it lightly periodically during the first couple days.

[@angusaitchison8378]

How long ago did you do block fill? Crack isn’t off corner so it’s not a natural expansion crack. It’s cracked right where block fill meets floor which indicates to me the block fill load expanded causing pressure on floor an cracked. Any experienced Concretor knows we all guessing to a certain extent though lol

[@krakenwoodfloorservicemcma5975]

love the boo boo bus. I worked out of an old mail truck for years.

[@bondobuilt386]

Ya its handy.

[@drcornelius8275]

Most residential interior concrete has an increased chance of cracking due to higher W/C ratio used. Excessive water means greater volume change and any restraint points will crack.

[@bondobuilt386]

I agree but we do not pour it wet like some do.

[@drcornelius8275]

@@bondobuilt386 Sure, and it helps, but you still have something called "drying shrinkage" occurring. Unless you're using some kind of expansive material in the concrete - type K cement or like material, you will have drying shrinkage. Low w/c ratio, proper wet curing for min of 7 days, and shrinkage reducing admixtures can help as well, but you will still always have volume change.

[@Ilove3SGTE]

Just looking at it you can tell it's not that wet.

[@bondobuilt386]

@@Ilove3SGTE thanks

[@Fldavestone]

We always pulled our wire mesh up into the mud.I think the key is the crack telegraphs into the stem wall .How soon did you pull off that form board? Was that the final part of the pour? It looks to me like it lost support and fell away rather than dried too fast on top and shrunk or curled.

[@travisleaton5409]

Concrete does 3 things gets hard cracks nobody's gonna steal it 😂😂

[@mattl6300]

There's only two guarantees with concrete 1. It's going to crack. 2. Nobody going to steal it.

[@bondobuilt386]

and it will not catch on fire. LOL

[@mattl6300]

@@bondobuilt386 there is now 3 rules.

[@bondobuilt386]

@@mattl6300 yup 👍

[@GRUBB-MUDD]

love the shirts off, like my videos, glad I'm not the only 1 making vifs w sun's out guns out, and shirts off 💪

[@bondobuilt386]

suns out guns out. lol

[@mrmotofy]

I would argue it's unprofessional

[@delyle101]

I can give you the reason why it cracked. Well three reasons 1. Mesh needs to be in the top 1/3 of the Concrete otherwise it is doing 0% work IE if its in the middle it is doing nothing from a structural perspective and if its in the bottom third as shown in the video its doing sweet f all as cracking occurs on the top of the slab - This is basic structural engineering people. IE You needed to put a top mesh layer, with chairs, above the hydronic heating. PLEASE NOTE Mesh on the base will actually promote concrete cancer as the mesh will eventually rust due to water sitting underneath the slab seeping through the plastic barrier. 2. You need to use aliphatic alcohol - Cracks are mostly caused by shrinkage and managing bleed water with aliphatic alcohol no matter the conditions (cold windy is just as bad as hot) the finish compound, when used correctly will significantly reduce the risk of shrinkage cracks 3. Construction joints that are acute induce cracking - You need to do your best to do them perpendicular

[@OntarioMiner]

I have a question about 1/2" radiant barrier PEX in slabs. Can you crimp a coupling to join two pieces together in the slab? Is this not recommended or may cause a potential leak at the coupling? My situation: I need four runs of 300 feet to have a 12 inch spacing for my basement. Supplier only had two 500 foot boxes and one 300 foot box left available. I can cut the 500 feet pipes to 300 feet but would like to make another 300 foot pipe from the offcuts which would require a coupling in the slab. I also have a Sandpoint well under this slab in my basement that could get contaminated if it leaks but that's another story. You understand why I'm asking.

[@bondobuilt386]

You can splice it but try not to unless its is necessary. The couplings will not leak but they restrict the flow a little but. I would buy another roll if it were me.

[@OntarioMiner]

@@bondobuilt386 ok thanks

[@sethdistler5332]

Splice it in a closet or something and box it out so you can access in the future.

[@AW-yv9sq]

Why not put mesh or rebar over the radiant? Why couldn’t you trowel joints?

[@bondobuilt386]

We could put in mesh or rebar over the tubing also but hard to tool joints into a machine finished floor. Thiscwas a shrinkage crack so the steel would not stop it just hold it together.

[@AW-yv9sq]

@@bondobuilt386thanks for explaining good video

[@kevinkotchevar2339]

Concrete quote if it hasn't cracked it will!

[@eldiabloblanco7232]

Any time you have outside corners it will crack at those corners. If you put 3x pieces of #3 @ about 36" at each outside corner it will help.

[@brooketrout1717]

Hey bondo I like to put rebar on top of the tubing

[@bondobuilt386]

I have done that as well.

[@thomascoyne157]

Nice work there 👍👍🇬🇧uk🇬🇧

[@bondobuilt386]

thank you

[@cygnus1965]

What are those big knee boards made out of? Just plywood? Looked light like foam maybe?

[@bondobuilt386]

Closed cell foam board.

[@PG-ku9qd]

I'm a Civil Engineer, and though I've only seen a couple of your videos, I'm betting you have cracks because you don't put any mesh or rebar in your slabs. Not quite sure why you seem to do them that way, but fibers just don't have the same strength that mesh or bars do. Have you been doing this long? By the way, that looks like a shrinkage crack, and there's no way that's going to close up.

[@robertthaller8085]

There is mesh in that floor and fiber

[@jessedukelacrosse6470]

You must be blind , no offense Mr engineer, I am a builder and concrete finisher 22 years , but you can clearly see wire mesh in his slab , and he said it was a 4000 psi mix with fiber

[@PG-ku9qd]

@@jessedukelacrosse6470 Um...no. No offense back at you Mr. finisher, but he stated that the wire was there to hold the heating tubes in place, and that they were not pulling it up for any reinforcement. Clearly something isn't working right, and if you have a better explanation, I'll gladly admit that I'm wrong. By the way, I meant no disrespect to him or anyone else that works that kind of ass-busting profession. It takes a lot of skill and dedication to even get into that business.

[@GRUBB-MUDD]

1st one here, I will give u an answer in a few, I'm guessing it's because u can't saw cut deep cuz the tubing

[@bondobuilt386]

your the 1st so you are the best.

[@GRUBB-MUDD]

@@bondobuilt386 😄 🤣 😂 best at concrete? jk keep knocking em out I watch may not comment on them all but I do watch them

[@bondobuilt386]

@@GRUBB-MUDD thanks bud 👍

[@whskythrttl]

You can put a short piece of rebar at an angle in the corners of the doors

[@pulporock]

Two types of concrete, one that has cracked and one yet to crack. Can you give a close up of some of your fibers or exact type of fibers. There are allot of differing fibers. And just on OSHA no shirt in the sun, I made the same mistake in my 20s. Cheers from Oz

[@tannerwest6823]

If there's one thing a concrete guy can guarantee ya is that it will crack

[@bondobuilt386]

@@tannerwest6823 Yup.

[@bradh74]

You said it when you said "This concrete's funny". You could do that stuff every day of your life and still not see it all! At least it sounds like your customer is a good guy. It's hard to take when something doesn't go the way you expect it to and sounds like he knew that there's no real guarantee with concrete other than, it will crack, we just hope it's where we want it to. That's why many people want a ticket with the weights on it so if something went wrong at the plant they know, but not all ready mix plants have that yet and some won't use it.

[@vegasfordguy]

You didn't pull up the wire! I knew it! Caught you on video! 😂 Just kidding of course. Is Biscuit your son?

[@jessiperry60]

buscit cracked it when he put those knee boards

[@robertthaller8085]

That's a weird Crack, I have no explanation for it, looked prepped very well. I personally would never take a risk and cut those joints in with saw when you have heat in it, I'd tool them in. Wire will still do a lot of good even on the bottom. Looks like a good job to me. Concretes funny stuff, can't control everything

[@lancerudy9934]

Nice video

[@bondobuilt386]

Thank you 😊

[@michaelmann3636]

The crack looks like a settlement problem because it transfers to the wall sections❓

[@genelukes160]

2 kinda of concrete, the kind that's cracked & the kind that's going to crack, the slab is the biggest when poured, water evaporates, it's going to shrink. No degrees, just 25 years in ready mix

[@b_lumenkraft]

"Fiberglass fibers" is not wrong BTW. Sounds weird, but grammatically, it's correct. :)

[@deonfackler5588]

Big biscuit needs to wear a shirt or a lot of sunscreen. Melanoma is no joke.

[@donmccoy4597]

You didn’t cut it in time. And did you cut it 1 1/4” no more than 15 by 15’ squares.

[@donmccoy4597]

Cuts are to give it a place to crack not just for looks.

[@concreter6832]

U seem to always get large complex jobs ,and do them well,

[@scottkazmier420]

One of the 3 guarantee of concrete It’s going to crack It’s going to get hard No one is going to steal it

[@bondobuilt386]

Scott and it won't catch fire. LOL

[@ericclark3885]

Should have a joint in every inside corner like that. They are always a week point. Give it a %100 next time.

[@donbrutcher4501]

Please explain what a low air mixture is and why you use it.

[@jolujo5842]

The concrete was mixed with too much water ... Or the surface froze before the cure was complete. Bad water/cement ratio is most likely.

[@Ron_Masterjohn]

So you’re the guy standing there with your hands in your packets? LOL

[@jeffcotton2235]

Concrete always cracks... it is the nature of the beast. Especially in residential pours. Also was it pure Portland cement or was some fly ash added also?

[@siriosstar4789]

Wrong. AMERICAN concrete always cracks .

[@bondobuilt386]

No fly ash in this mix.

[@jessedukelacrosse6470]

Southern Cali we are back to having idk what , looks like black tar mixed into mud , you can see it coming down Concrete pump hose , haven't seen this since 2007 , must be a shortage again

[@relikvija]

2.30 looks like a painting

[@bondobuilt386]

yes it does 😀

[@Nate.G.1111]

You'll have that on those big jobs!

[@belindariley8835]

its concrete ....thats what it does.... if there's no cracks its not concrete lol

[@bondobuilt386]

yup. lol

[@Tyler43055]

Fibers doesn’t add strength.

[@joehuinker7009]

The biscuit is fried

[@marctrossbach6560]

Excellent

[@concreter6832]

How do they put air in concrete?we don't get very cold weather over here

[@jimkemp308]

It’s been my experience that it should be at least 5inches to hold the weight of the vehicles.

[@viewthoughmyeyes]

What's the main reason concrete cracks or fails? A.) Not enough water and not mixed correctly B.) Dries too fast. C.) Too much water. D.) No expansion joints There's two types of concrete in this world. Concrete thats cracked. And concrete that hasn't cracked yet..... LMBO If you didn't cheat and look down here the answer to the question is C.) too much water

[@andreycham4797]

Are you burning biscuit again ?

[@bondobuilt386]

He likes to go shirtless. LOL

[@scottwilson6957]

Hot mud, dried way to quick.Need water and burlap.

[@securem3]

Pex manufacturers recommend tube be in the top 2" of concrete

[@bondobuilt386]

Try that and you will cut a tube for sure when you do the relief cuts.

[@tnolan3176]

THAT crack almost looks like you pulled the outside form to soon and the concrete pulled apart !

[@mikegreene3048]

I finished concrete for 40+, and I always guaranteed my concrete! LOL, to get hard and crack.

[@Scubasteve22]

This new mud is super shrink happy.

[@quickdeuce]

I notice only you and a couple other older gents were wearing long pants. The younger guys,, wait til they get a case of concrete poisoning and they'll learn. Long pants when working in concrete is a good idea. Shorts aren't that much cooler anyway.

[@moman0166]

After years of expansion and contraction the concrete will crack in the darnedest places.

[@eugenebennett5800]

WHY NOT 5000 LBS ..... WOW

[@toddreynolds8875]

Theres is three guarantees in comcrete work. It will get hard. , no one will steel it, and it will absoluetly crack Any one that says there concrete work does not shrink crack is a liar

[@navagationvrvideos7445]

It cracked cause someone came at night and hit it with a sledge hammer 🔨

[@bondobuilt386]

lol I knew it was not my fault. lol

[@JRP3]

Imagine if concrete was just 5% more flexible.

[@bondobuilt386]

I wish. lol

[@JRP3]

@@bondobuilt386 I did some investigating and there is flexible concrete, more expensive of course: Flexible concrete was developed at the University of Michigan by engineering professor Victor Li. It was developed to be used in earthquake-prone areas around the world such as Japan and Korea. This new form of flexible concrete helps buildings be earthquake-proof, enables roads and bridges with fewer potholes and cracks, and allows other uses where the concrete must be flexible to last longer. This flexible or engineered concrete can be used by engineering services to build commercial projects using traditional methods. Flexible concrete is different than traditional concrete in that it has polyvinyl alcohol fibers and very fine silica sand instead of course aggregate. Other fibers such as silica fibers, glass fibers, steel fibers, and asbestos fibers can be used. These micro-fibers give the new concrete its flexibility. In addition, a slick coating or anti-frictional coating is used to reduce friction between the fiber particles in the cement. This helps eliminate cracks and make the concrete flexible. The concrete can also contain latex, lignin, melamine, polycarbonated ether, lignosulphonate, or other superplasticizers to improve workability and flexibility.

[@jessedukelacrosse6470]

No such thing , just got to score it or saw cut it right , keep concrete hydrated or cover it with plastic which gives it an ugly look for a few weeks

[@JRP3]

@@jessedukelacrosse6470 I literally quoted an article about flexible concrete, so there is such a thing.

[@duanewessie7374]

I thought paddling was only done in Wisconsin in New York it’s called raking concrete

[@viktorstrigeus5800]

US is so wierd. Using inch instead of cm and have almost no rebar/mesh in the slabs

[@eddie8166]

question why not rebar??

[@ed1pk]

Tyler Ley has some great videos on why concrete cracks. One reason is that the concrete is drying out too quickly because of conditions. Wind, humidity, temp, etc. plastic shrinkage kzbin.info/www/bejne/jIaQpX2dic6nm6M

[@ed1pk]

Also best to keep the forms and concrete covered for at least 24 hours and ideally 72. Form removal - Tyler Ley kzbin.info/www/bejne/pYjThZaOnbSfbKM

[@randyrioux5243]

Next time put a expansion joint on your door opening rookies

[@Arthur-ke9vz]

I'd be fired within the first hour, go clean up, bring back my drums, and do something I'm good at lol.

[@tomcander3669]

It's 4000psi concrete!!

[@bondobuilt386]

Yes with fiber reinforcement

[@tomcander3669]

@@bondobuilt386 but you said 4000 pound lmao

[@bondobuilt386]

@@tomcander3669 oh my bad lol 😂

[@noobishsite]

Well to begin i cant understand why you americans use so little steel in your slabs! you should have the bottom steel on distanceblocks from the ground and another layer approx one inch from the top

[@timgoble9891]

That's because that's what concrete does

[@carloscain6673]

It’s concrete it cracks wen and where it once 2

[@bondobuilt386]

yup for sure.

[@galewinds7696]

Bad sign to Crack this quick after pour.

[@Jim-yk9zw]

I was on a job for some filthy rich couple a few years ago and the slab cracked so it had to be Jack hammered out and done again. The fkn thing cracked again which I've never seen before. Only thing on that job and this one is under floor heating but I don't see how that would contribute.

[@bondobuilt386]

Most concrete cracks. Just need to control it.

[@Jim-yk9zw]

@@bondobuilt386 These cracks were a bit more severe than the usual. Our norm was installing aluminium angles as control joints (same on that failed job) and they are often handy as something for the concretors to screed to.

[@mdtransmissionspecialties]

🤘

[@nonyabuisness]

Because concrete cracks 😆

[@bondobuilt386]

yup. lol

[@nonyabuisness]

Water is wet, fire is hot and concrete cracks.

[@bondobuilt386]

@@nonyabuisness for sure 👍

[@rubenrodriguez8696]

I'm pretty sure it all cracks

[@minerdad02]

Beer 30

[@banovak611]

Would you come to Ohio and do a build? Not joking..

[@bondobuilt386]

I can't we have so much work at home.

[@bigsmoke7381]

Concrete will eventually always crack

[@jessedukelacrosse6470]

Concrete cracks no matter what , every concrete guy knows that , nice work over all 👍 if the homeowner gets whiny then it's a quick fix , you know how it is , usually cause a fit to get you to knock off a few hundred bucks from final payment, you know how it is

[@GRUBB-MUDD]

yea I'd say it cracked because u guys didn't do it right, no I'm just kidding bro. I'd say it cuz the foam. have a great day

[@GRUBB-MUDD]

usually don't see cracks after the 1st day b4 saw cut, who knows it probably was the foundation and the Styrofoam, I'd rather just nit use that stuff on certain jobs

[@bondobuilt386]

@@GRUBB-MUDD thanks bud

[@GRUBB-MUDD]

@@bondobuilt386 I'm dropping 1 today that tells my story. can I send u the link?

[@bondobuilt386]

@@GRUBB-MUDD sounds good bud

[@bigal25938]

That’s not normal expansion cracking.

[@fitmcdeezy8778]

Show me concrete that hasn't cracked

[@bondobuilt386]

True. LOL

[@fitmcdeezy8778]

I've had 5" concrete slab with control joints every 12'-6" ,cut 2" deep and it still cracked between every single one. I was pretty blown away. Sometimes concrete says f it I'm gonna do what I want lol

[@bondobuilt386]

@@fitmcdeezy8778 yup lol 😂

[@josearanda9627]

Good Boys

[@SG-uh6sw]

Probably had no black in it you know the saying