What Is Causing This?!

Tom gets a call because the concrete at a warehouse is heaving. Check out what he finds underneath the concrete!
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[@terryross1754]

I am a life-long engineering QA/QC person, and I really enjoy watching a conscientious professional boss running a good team. You are a good example to others. Keep on keeping on !

[@Concretewiththehauses]

Thank you very much. I really enjoy every day.

[@ryansmuscle]

Amen brother

[@btj1844]

I was in commercial construction for over 45 years and have experience with heaving and subsidence. Generally speaking, depending where you are geographically, heaving can be caused by many things like leaking pipes under the slab, unstable soils types below the slab such as high P.I. soils or fat clays. A soils investigation by a qualified Geotechnical engineer would expose this before foundation and slab work if employed. In severe cases the entire slab may need to be removed and remedial work applied to the subgrade such as lime stabilization or complete soil replacement. It's always a complicated subject with lots of finger pointing. Good luck!

[@MikeZMonroe]

Appreciate your comments from professionals that has had practical experience in a construction dilemma like this. The owner of this property I’m sure appreciates all the input as well as Tom.

[@longwildernesswalks]

Hey Tom, first time viewer of your channel here. First, great episode and wonderful explinations. Thank you! We ran into a similar issue in Lubbock, Texas back in 2009. Slag was used as a base media, and we found that every time it rained our warehouse would heave. Our company was a distributor of water chemistry for industrial treatment so 275 gallon totes would go in and out all day on forktrucks. We would avoid traveling over the effected area when it did heave, as best we could. That said, we did not tear out. Instead (since the building was at the base of a hill and water was pooling in a low area around the building) we built a 3' deep french drain around 3/4 of the building. Mainly around the areas were no traffic would be. Almost instantly the slag stopped heaving as we diverted any water away from the foundation and out toward the street for runoff. This solved our issue, and 14 years later we're still doing great! Might be something worth suggesting. We also placed a few layers of poly in the bottom of the trench and up the wall toward the building, then covered it, to prevent any passthrough leeching. It's not cheap, but it's cheaper than pouring 3000 sq.ft. of concrete again. Water, it's a huge pain in the butt. Great episode! I'll be back for sure!

[@jimmcginty8572]

Always enjoy watching you and your team figure out the problem, and then professionally finishing it!! Thanks for the soil education Tom.

[@Concretewiththehauses]

Our pleasure!

[@tombarnes1871]

Hi Tom, After WWII a lot of brick homes were built in the Pittsburgh area, many used the J&L slag from the pile along the Parkway North. A lot of people used the slag because it was cheap as opposed to 2-B washed gravel. Eight years or so later the foundation blocks began deteriorating Requiring the house to be lifted everything removed and new block foundation installed. The ground was with the slag interacted with the concrete eating each out!!

[@Concretewiththehauses]

Wow, that is amazing. Imagine the price tag on all of that.

[@keithburch5506]

What is the 'slag' made from? I understand the company owner is leasing the building and isn't going to pay out any more than necessary. This really reminded me of my 9.5 years in construction. When we had bad weather they would try to find work inside for us. We were bricklayers, but we did many different jobs inside. Better than signing up. Less than 32 hours, we would sign up for temporary unemployment. Wasn't a full week pay, but better than no pay. You pointing out the dried/frozen mudd in your skid loader, reminds me also if jobsites. The brick crew was on site when it was fresh. Just graded dirt w a concrete footer. Any amount of water makes a muddy mess on everything! So I feel for you, it's a day to day problem when working on new jobsites. So many of us can honestly say, "I hate mudd!" I did remember y'all being there the first time. Another great video in the books! Thanks Tom.👍🙏❤🇺🇸🇺🇸

[@Concretewiththehauses]

Thanks Keith it’s always a struggle working in the winter

[@robertwazniak9495]

Tom… the obverse can also happen. If the expandable soil was wet (expanded) when the building was constructed, then a lowering of the water table could have caused the problem. The area around the perimeter of the building could have a lowered water table for some reason and the soil settled. Here in Wisconsin, it is quite common to have level manholes in the winter and they turn into bumps in the summer. Here it is frost raising the roadway and the manhole doesn’t get frost under them. A similar thing happens with the expandable soils. The “draining” of the perimeter could be weather caused or somebody may have just installed an underground utility and inadvertently created a French drain and over the years the water table lowered a bit.

[@MikeZMonroe]

Super insightful comment. In reading other comments there’s a wealth of very knowledgeable people watching Tom who respectfully comment as they really technically know there $hit.

[@Concretewiththehauses]

You’re right, that sounds like it could happen

[@skliros9235]

This is my thought too. Add in the fact, they are stacking heavy materials around the exterior of the building, that adds weight on the building foundation. The building is settling slightly.

[@raybonecrusher4516]

I have seen the same thing happen before. During construction, a access road is built thru the site. Many times fly ash is added early into the ground to dry up areas that traffic has pumped up moisture. Most of the time the area that was used as a access road will hump up during the curing time after the concrete is poured. It looked to me like the heaving of the concrete was uniform and in a straight line from end to end of the building. The access road thru the building would not have the same substrate as the rest of the building.

[@Concretewiththehauses]

What a mess

[@Davewdmace]

Nothing wrong having that "go to expertise" makes you and your business more diversified and profitable. And that's the bottom line. Always enjoy and look forward to seeing your videos.

[@Concretewiththehauses]

Thanks

[@donttreadonme9132]

I hydro excavate every day here in Colorado Springs. We have a lot of different soils here. I dug a 22 ft deep 4ft diameter hole and it was all sand. Other spots we have clay, sandstone and tons of river rock and cobble.

[@jamesadams893]

I enjoyed the video ,nothing like somebody talking incessantly and showing very little of the actual work done

[@jimmieburleigh9549]

I'm sure I'm not the only one that can do without the loud music

[@bollera.bolljr2414]

Tom , without a proper soil test this could come back to bite you .We were called in to remedy a slab in a municipal garage that was heaving , after breaking out a section of floor 8"thick we had a soils engineer take a coring sample , his findings were we were actually on a peet bed that was app 4' deep , if not deeper .Their solution was to layer 2" dense blue styrofoam in a predetermined criss cross pattern to stabilize the future concrete floor , surprisingly this was done in numerous building in the area and was a working solution . we did this app 8 yrs ago and it is a municipal vehicle garage , so far we have had no problems , we are in the metropolitan Chicago area ! hope for the best and pour the rest !

[@paulrosselle9747]

Was the job done wrong? Or are you being a critic?

[@dc6233]

@@paulrosselle9747 Did you read what he said?? This "could come back to bite you" because he may have needed to excavate more material. However, if the water table was that high, what then?? I'm sure there could have been more testing and greater costlier solutions, but being a leased building with the owner responsible for the repairs, I get it. I don't think the guy was being a critic, he was sharing his experience with a solution that works in similar situations...

[@JS-qd9rz]

DC maybe people didn't realize the business owner is responsible for the maintenance and upgrades and not the building owner.

[@ladeseddy5994]

Agreed. Seem it before. Styrofoam. Drainage would help a lot. Next big rain....

[@bollera.bolljr2414]

@@paulrosselle9747 no on both counts . Job was bid as occupant wanted it repaired .Owner of building should have known this was a problem since he has owned it .I'm just being honest that we had a similiar problem with a municipal building , the floor was heaving .After numerous attempted repairs owner called us and we immediatly took soil borings .Boring company suggested excavating to minus 4ft and layering in 2 in styrofoam in a pre determined pattern to within 10in of finish grade and pour with rebar ....it works !

[@BloodSweatTearsConcrete]

Working indoors even for a couple days (especially in a factory setting) makes me miss the outdoors. I can’t imagine working everyday in there. Nice work!

[@Concretewiththehauses]

Tell me about it

[@michaelc.3812]

I like in golden Colorado and knew the answer to your expansive soil question. We have it up and down the front range as there is much clay in the soil. Builders in homes out here have resorted to NOT pouring basement floors but they hang a joist style floor in many homes (most of the homes out here have basements, unlike some other areas as our water table is much lower). We also must build floating walls when finishing a basement or any walls on top of concrete (look up floating walls, and they aren’t to difficult but they are SUPER important so you don’t destroy a home). Good video Tom, thanks

[@Concretewiththehauses]

Very interesting the different techniques

[@michaelc.3812]

Nice job Tom, and it seemed a good compromise to fix what really had to be repaired and not tearing out the entire floor. Nice weather in there too, considering it’s feb!

[@Concretewiththehauses]

Thanks 👍

[@jamivanschoyck3852]

Very nice you took the time to explain about expanding soil’s. Most people wouldn’t do that that gives us all the indication of your character Tom thank you very much very useful information

[@Concretewiththehauses]

Glad it was helpful!

[@jimputnam2044]

My dad used to do Diamond drilling to test soil before large buildings or roads and bridges before they were built. Was interesting to learn this from him

[@Concretewiththehauses]

I’m looking forward to learning more

[@garyweber7419]

I'm betting if you check outside around the building the drainage has changed and the waters not getting away from the building because this would have been a problem long ago. This happens often gravel added outside / inconvenient drainage ditch closed up / building added next door dumping water .

[@Concretewiththehauses]

I think you’re right

[@davidbishop4015]

Very informative Tom. I learned something new with this video. I like how you do your homework to solve the problems that you encounter during the jobs you do. And how you ask for help if you don't have all the answers. Great job. Stay safe.

[@Concretewiththehauses]

I love challenges and I really enjoyed learning new things

[@gorillaau]

​@@Concretewiththehauses In any industry, if you are not learning, you are probably going backwards, and there is always more to learn.

[@chucklogan9611]

Tom you should definitely send those soil samples out for inspection by a certified company just to be absolutely positive about the underlying cause of this

[@Concretewiththehauses]

We dumped on site we still may do a soil study just out of curiosity

[@geneticdisorder1900]

I worked on a house where the basement floor heaved, poor drainage, no space heater, fhakin cold weather. Bad combo !!! Floor split down the middle and lifted almost 3” pushing the lally columns up too. After thawing, the carpenters had to cut an 1-1/2” off most of the columns. The floor of course never completely settled and had a good 1/2” canyon the length of the house. Another house,luckily only had 3’ of ice in the basement 😬 didn’t hurt the floor or house. Didn’t need a step ladder to rough in the plumbing and heat piping .

[@Concretewiththehauses]

That sounds nasty

[@Tokaisho1]

They could do with a good drainage system at the side of that building where the hill is, might remedy this for the future

[@botfoblhrp]

that guy with board screed is kinda magical😄👍

[@Concretewiththehauses]

Thanks,

[@flowerstone]

Tom, this is about some past pours. On the steps I notice you set your form boards at height of slab. When I did steps I ripped the bottom of the board at a 45 degree angle so that I could trowel right to the step. When I pulled the form there wasn’t anything to trowel out. Of course, we let things get a bit dryer first.

[@tomscott3939]

i worked at kaiser steel in fontana california an there is no mitaken the smell of mill slag. i think a 6 inch slab is what should have been in the building with rebar!! tom i feel confident that it will be a strong fix!!

[@Concretewiththehauses]

Thanks

[@stevenstart8728]

Very interesting problem in that building. I'm from Australia and have done more concreting than I like to remember. Your finishing was second to none. We also have expandable soils or as we say highly reactive clays. They are generally black cracking soils. Many foundations and house slabs have broken in half on these soils. We use pre fabricated mesh in slabs and footings in Australia on a lot smaller grid.

[@Concretewiththehauses]

Every area seems to have this problem

[@kennethfriedrichsen7079]

We always called it Flyash. It does have expansive qualities as well as some trace environmental issues. Good content. Thx

[@Concretewiththehauses]

Thank you

[@kennethfrickey4087]

Loving the new music…perfect touch.

[@michaelvrbanac6923]

Great video. Should tape seams. Should double that 6 mil or use 10+ mil vapor barrier. French drain around building may be considered to catch water.

[@softballtigers587]

Good morning from Clemson, South Carolina 🐅

[@Concretewiththehauses]

Morning!

[@jacklachman5304]

Good morning everyone from Virginia Beach…very interesting video. Thanks again for sharing. Catch ya on the next one Have a Day

[@Concretewiththehauses]

Thanks, you too!

[@jamesharless5357]

Nice work, Tom, great video!👍🏻

[@Concretewiththehauses]

Thanks! 👍

[@robsnyder2461]

Its funny, as soon as the truck shows up it kind of looks like a pack of dogs on a three legged cat!!

[@Concretewiththehauses]

That’s what it feels like sometimes

[@alisciamarotta3888]

Tom we call them " job security ". Great job as always!

[@Concretewiththehauses]

Thanks

[@stewatparkpark2933]

The best way to approach this type of job is to get the client to engage a suitably qualified engineer to do the investigation and to design the remedy and to supervise and inspect your work . This way you are just doing what the client requested and the engineering risk is carried by the client and their engineer and not you .

[@DFord-qw8ci]

I've been doing a lot of work around Philadelphia. That base is absolutely everywhere here as general fill.

[@Concretewiththehauses]

Be careful,lots of drainage

[@ralphmckinney9886]

Coal fired power plants sold that in my area in the 70's to contractors for fill. Coal ash is the mineralized residue left over from burning coal to generate electricity. It's actually a collection of different types of materials, called coal combustion products or coal combustion residuals: fly ash, flue gas desulfurization products, bottom ash, and boiler slag.

[@Concretewiththehauses]

Good info

[@larrybe2900]

With EPA requirements lime is added when burning bituminous coal so it makes a good candidate for making concrete.

[@vincenttulli2776]

I love watching true professional work doing it the right way

[@Concretewiththehauses]

Thanks

[@video4belphotos]

Definitely a Five Star presentation. Thanks.

[@Concretewiththehauses]

Our pleasure!

[@spaceexposed]

Awesome repair work! Good analysis, expandable soil is a real pain to have under big structures. I was just going to say but you said it, drainage. Spot on Tom! Maybe they should cut a ditch in the back of the building facing the hillside?

[@timothychristian9140]

There is a gentleman on KZbin that does concrete work. He has a worker by the name of Jim that could probably help you out with your concrete questions 😂🤣😂🤣😂🤣😂🤣😂🤣.

[@alisciamarotta3888]

I agree, 😂 😂 😂

[@Concretewiththehauses]

Tricky parts getting him to answer his phone ha ha thanks

[@FearsomeWarrior]

Bentonite in Colorado is the one I’m most curious about. I know basement walls have to be hung from the ceiling joists or walls and are never supposed to be anchored to floor. I’m in Minnesota where basements are a guarantee in every home we just bolt down our bottom plates. We have frost heave but nothing in the ground that heaves. Just rocks under soil here.

[@ilkacheel]

Inserting 1/8th plywood into sawcuts will prevent spalling to existing concrete while you break up and remove existing concrete.

[@Concretewiththehauses]

Good idea

[@caniacstevehenderson7115]

Well done sir!!

[@Concretewiththehauses]

Thanks

[@dford8874]

I think it's a mix of they really believed in the substrate equally to what was readily available.

[@jackalopasaurus]

Your jack hammer sounds like a Browning M2 .50 cal, lol.

[@TheBfor86]

While you might have some expansive clays in there, the culprit is likely the slag itself. When moisture moves into areas of slag backfill it causes it to corrode and the corrosion causes significant expansion.

[@stewartmcardle8149]

What I find astounding is that the user of the warehouse and not the proprietor, is responsible for the maintenance of the building. Here in the UK it is the proprietor that is responsible for the upkeep, though a number of bad owners don't comply with this ethos.

[@GratefulNachos]

As a geologist who works in the environmental remediation business, this sub-base could be a source of VOCs infiltrating into the building. Especially since you said it had a “smell “. It really should be sampled properly, for your safety and for the employees of the facility.

[@Concretewiththehauses]

I can mention it to them

[@GratefulNachos]

@@Concretewiththehauses I think it’s warranted. Your team does great work by the way. Really enjoy your videos.

[@iaingibbs9589]

Those men made that finish look easy That is one of the hardest jobs I've ever seen and no of

[@3535gt]

Had a client that after we got to talking, he said he had a career of building mega warehouses. The thing that stuck out to me was that he never used rebar. He said Slabs over 7” thick didn’t need them. If the forklifts started to have issues or the floor started to crack they’d cut it out in 15’ sections and repour. He said his building were acres big. Interesting concept.

[@Concretewiththehauses]

I can understand that on the floor that size

[@nathandean1687]

act u want rough edges on a pad. itill help new poured concrete to grip as it forms.

[@garybruno4360]

That is an interesting piece of information, I have a similar situation in an equipment garage on the farm.

[@Concretewiththehauses]

Hope it helps

[@lhr1701]

Tom I used to work in a mini mill in NJ we made wire. Anyway the slag was sold as fill everyday. It is slimy when wet. But dries hard as concrete. As for why there is water under the slab. My guess is progress and development of the surrounding area. I bet a lot of buildings weren’t there decades ago. So the water doesn’t permeate the ground as it once did. And you know water it will go where it wants to.

[@Concretewiththehauses]

You’re right about that

[@kens.3729]

I Watch a Channel, (copperheadmarine) and Charlie treats the Soil on Huge New Warehouse Projects so Slabs can be safely poured without future soil issues. 👍

[@philhermetic]

is it heaving in the middle, or is it sinking around the edges where all the weight is stacked? when you were attacking the mill slag with the bar it seemed to be very hard, unless it is heaving from water under an underlying clay layer with water under it? tricky problem, especially where the guy doesnt own the building!! Good luck with it. Phil

[@Concretewiththehauses]

Edges look good little is heaving

[@kevinraines4318]

in the UK we have had the same sort of thing in house's after they used ash slag from making coke in the day we had to dig the lot out some times up to 5 foot deep

[@Concretewiththehauses]

Wow, pricey

[@Charlie-go6eb]

It’s interesting the tenant is responsible for a pre existing condition under the guise of maintenance. Luckily we don’t deal with moisture conditions in soil that can cause issue’s around here. Good video.

[@jamesyoung4633]

Years ago l put in a service under paved drive way that had slage under it. And it was put there to stabilize the farm soil under it. With out it they claim that pavement would unulate when wet and driven over it.

[@mjb12141963]

Yeah, winter never really quite got here.

[@dford8874]

I've done repairs as a result of that very same base material.

[@Concretewiththehauses]

It seems to be everywhere

[@johnwarwick4105]

No concrete expert here, but I would have expected you to use more rebar after all that work. Those squares look very big. Think most people over here would have used the big mesh sheets with about 8” squares. Interesting to here about the mill slag issue

[@Gadeto]

In Europe (me from austria) we would use at minimum 2 or maybe 3 layers of rebar with 4" squares. Also concrete with a minimum thickness of 12" at industrial buildings like this. It always makes me smile (or more shocked) when i look at clips where you can see how poorly construction work in the US is done.

[@Bluuplanet]

Other than the odor, your description of the mill slag sounds like the description of clay. They may have similar characteristics under concrete, which would not be good. Clay can grow/shrink up to 11% of it's volume depending on moisture content. That us a HUGE amount!

[@uncommonlogic1698]

Well pits for lowering the water table, sump pump to discharge. Wellpoint soil drying...

[@jeffwilson1399]

Not saying that you are incorrect with the assumption that the mill slag is exhibiting expansive properties, but there are other questions that need to be asked and answered to have a definite answer to the floor problem. Right off the bat. . That floor system doesn't look as if was designed to hold the dead weight of material in super sacks or the fork trucks to move them, or the tractor trailer loads being driven on that floor. Too much weight for a 4 to 6" slab of mostly unreinforced concrete. . With no dowel bars to transfer the loads from slab to slab, and extremely large saw cut spacing could all be contributing to this issue. While it's entirely possible that environmental changes in the area causing the ground water to rise. . I would start checking the basics first. . Blocked storm drain. . Broken roof leaders. . etc. Way cheaper to unclog a drain than it is R&R the slab, without even identifying or fixing the original issue. Also worth noting. . That mill slag can be some bad shit. . . It wasn't unheard of for the steel plants to dump the wasted chemicals used to prevent oxidation of the product coming out of the furnace, into the slag pits. Benzene, toluene, and Xylene. . To name a few. So maybe disturbing that shit might not be the greatest idea.

[@Concretewiththehauses]

Very interesting thanks for sharing

[@jamaelmckinney7247]

So you don't have the vibration of the hammer what we usually do if cut it up into cubes turn on the size and the weight then find the middle of each cut cube drill the middle anchor it and pull it out in squares what the high low or the bobcat with the chained or metal strap. There's more cutting involved but it is pretty effective and efficient

[@Concretewiththehauses]

I don’t know is it really easier?

[@jamaelmckinney7247]

Yes it is and you don't have to worry about dust control

[@onryboy2264]

The city of Akron, Ohio uses a lot of the expandable soil for the sewer system as fill around the pipes/hollowed out trees in the 50's and 60's now they are trying to get rid of it the redoing of the lines.

[@Concretewiththehauses]

Sounds pricey

[@onryboy2264]

@@Concretewiththehauses between them using what was available to them cheap and the sub-par design of systems that is being addressed at the same time it's coming in at just about $1,5 billion dollars. We have the sanitary sewer and the Storm run off tied together and it's getting into the stream's and rivers.

[@madman432000]

Where I work they just repair bad floors with blacktop, which doesn't last at all. Forks gouge out troughs and the weight with forklifts creates dips in the surface.

[@Concretewiththehauses]

Sounds like a safety violation

[@debbievogt9881]

They were having too much fun to share with you

[@TimSlowey]

The other issue you need to be aware of is if increased moisture levels caused the soil to raise...what will happen if you enter a very dry period where the moisture will decrease and the underlying soils will shrink. I have personally dealt with numerous events where floors heaved because of a broken water line in expansive soils. To correct that the concrete that is replaced must be capable of fully supporting the floor with zero support underneath (hollow) making it essentially a bridge...something to consider.

[@HereticalBuilder]

I enjoyed the video, nice work. Suggestion, hard rock during the time-lapse is hard on the ears. Neutral music works much better.

[@billsmith5166]

If it was mill slag, why didn't it heave everywhere? Considering that mill slag was probably used on every job back then, are you sure that every problem is blamed on mill slag just because when there's an unrelated failure there just happens to be mill slag underneath? Is there any chance there's a big boulder down there? Usually the gravel base allows for quite a bit of soil expansion because it's a buffer, and it looks like there's enough there. It just seems really weird to me.

[@GradertJ]

If that building isn't heated they're allowing the water under the slab to freeze and that's causing the frost heaves.

[@greggb1416]

Nice work…, loved the information on the “expandable soils”… Tom, how long for cure time on those slabs, given you know the number of forklifts that will be running across as soon as you tell them the time frame..? Hank you sir.

[@Concretewiththehauses]

Two weeks for the forklift

[@greggb1416]

@@Concretewiththehauses ok, thank you for the reply back.

[@andywest3260]

When we lay DPC membrane in the uk we glue the DPC with a water proof double sided tap to the existing concrete tthen you don’t get any coming up though the joints

[@Concretewiththehauses]

We do that sometimes on our heated floors, but not my common practice

[@josephkanowitz6875]

@@Concretewiththehauses ב''ה, any Radon concerns in your area?

[@kevincharlier8324]

This is happening in my basement, it's pushing up on my upper floor and causing problems..

[@Concretewiththehauses]

It all needs excavated out

[@jimmieburleigh9549]

Put concrete wire under the re-bar and you can pull the wire as you go instead of using chairs and tripping

[@Concretewiththehauses]

I still like to use chairs when we can

[@ronaldpigeon4713]

Couple of questions, if they had run rebar would it have lifted that much. I did not see any. If it is caused by moisture, why is it only happening in the middle sections not at the outer perimeter where there would be much more moisture. Was a stem wall installed around the perimeter? If you are getting groundwater a couple feet down, is that not your problem? Pouring over a high moisture/water saturated sub can never be good. It did last a long time under those conditions. Last thing, I have seen pads poured on the ground and were considered floating pads, no issues. Seems that should work granted you provide expansion joints. Thanks for the information.

[@williamevans6522]

Add deep perimeter French drains to stop water (from roof and groundwater) migration under the slab.

[@kullervo.]

Nice video!

[@Concretewiththehauses]

Thanks!

[@Whitewolf4869]

I saw what the problem was in the first 5 mins. It's the plastic under the concrete. It traps water and then freezes. Never put plastic under concrete that's going to freeze!

[@jimharmon3404]

After you described the lay of the land there it sounds like your customer has a water problem that should be addressed. The town or a civil engineering firm should advise your customer about installing a french drain and sump system around the outer foundation to prevent water from the hill side from getting under that building. Roof gutters must also drain the roof water far away from the building. I offer this as something to consider. It was fun watching all that work getting done.

[@edwardsullivan5481]

Curious? How did you concluded the mill slag was a part of or big part of the perceived problem? And did you consider that the heaved area may have been harder ground and the adjacent areas had more fill and settled slightly?

[@Concretewiththehauses]

Definitely mill slag, along with some clay took it down as far as I could go not much I could do after that

[@edwardsullivan5481]

@@Concretewiththehauses Yeah I caught that it was mill slag. I'm just not getting how that aggregate was an issue.

[@oilhammer04]

We lived in Jackson, Mississippi where they have an abundance of Yazoo clay, that damages buildings and roads. I-20 is bad in one area in the western part of Jackson.

[@gavinsharpe4746]

Why wouldnt you have a slip joint between the old and new....if you pin them together will the old expand and raise the new?...fill with inert sand on top of a membrane

[@grpcchurchnortonva.8024]

Great video ! Never heard of this problem!

[@Concretewiththehauses]

Thanks

[@frankcooper6911]

I did that . Apartment Sidewalks and Driveways . I was hitting it Hard ! Until my Family found out ! That's when it all went down Hill .

[@rickgeller2751]

Are you going to drill into existing slab? Using greased dowels for movement issues?

[@DR-jo7fg]

Hope they don’t expect you to be responsible for the Subgrade being the wrong material. Sand is usually what we used

[@stayonit8026]

The water run off is always a question on the out side perimeter of structure and if your in a frost zone makes all the difference

[@TheNikitis]

Question for you. If someone came to you and needed broken up concrete thatyou removed from a job so that person could fill in a road to harden up the soil, would you give it to them?

[@Concretewiththehauses]

I would have to say yes, because I’m always looking for places to get rid of it

[@kevinhall2266]

Interesting. That was learn for the day.

[@Concretewiththehauses]

Thanks

[@donaldlee6760]

At 28:26 - I think you actually mean the silts build up at the base of hills over tens of thousands of years?

[@Concretewiththehauses]

Yes

[@guygfm4243]

Thanks for sharing

[@Concretewiththehauses]

My pleasure

[@alansherby4046]

If you got bad soil wouldn't it settle compared with expansion soil?

[@Concretewiththehauses]

No, it doesn’t work like that

[@rickgeller2751]

And please tie a mat of #4 rebar in new slab. It will do wonders.

[@Concretewiththehauses]

Wonder if you even watched the video

[@rickgeller2751]

Whatever state your in you guys are amatuers. First of all if your subgrade is expansive it would swell when concrete was first poured, then as the ground dried the subgrade would shrink, creating voids. Now if their was a rebar mat which their isn't, the slab would move as one piece. Pretty simple stuff. And why are you using a home owners concrete saw on an industrial job? If you want to do things properly, send me a reply and I will guide you on everything concrete. I make it rock hard!!

[@shaggyrat2643]

Finger nails to chalk board Only sound that goes threw me and people like me Its the fast forward moment lol Picking up the frag concrete

[@genegreear4183]

You said the water I table was high. Would it have helped the floor to run a drain around the whole building? Say four feet deep just to get rid of the water issue? Thanks later