ULTIMATE CRACK REPAIR | CONCRETE STITCHING SLAB USING CRACK-LOCKS, EPOXY, AND CARBON FIBER
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- čas přidán 18. 11. 2018
- CONCRETE STITCHING!
We used carbon fiber Crack Locks and Straps from Rhino to STOP a moving crack.
First we had to open and clean the crack using a v-shaped diamond blade grinder. Then blow off all the dust debris inside the opened crack. Then we marked the location of the carbon fiber crack-locks, spacing them around every 8 to 12 inches. We saw cut the lines of the locks, then drilled in holes at the end of the saw-cut lines. Vacuum and shoot pressurized air into the cracks and cuts.
Then we inserted a layer of epoxy paste into the groves, inserted the locks and applied a final version of the epoxy paste.
Once all crack locks where cured (about 2 hours in), we installed carbon fiber straps to redistribute the stresses caused by the fracture. We applied an epoxy primer layer on clean ground off concrete, the installed the strap, and topped the strap with another epoxy layer.
FInally we inserted concrete repair material inside the remaining gaps of the crack for the only purpose of sealing the big wide nasty crack!
Ready o hire a great concrete repair contractor?
Contact us: oliver.aguirre.concrete@gmail.com
Keywords:
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Very interesting way to do this! Nice job.
Thanks for the possitive vibes!
That repair is different. Looks good too.
Hi Dennis, thanks for your comment. This is the best way to truly stop a crack and recover full structural performance. I am glad you liked it.
Would love an update on this
Concrete is very weak in tension so I expect that assuming that the straps are stronger in tension than the concrete the top layer will just fracture off in time as the slab continues to move - as it surely will. There is no way that this "repair" will last. If the homeowner doesn't want to replace the slab with a properly engineered one they should simply mastic the crack with a flexible grey mastic to minimise water ingress.
The CrackLocks are designed to fully composite into the concrete, using both bond and mechanical attachment to the concrete. The composite has the ability to reinforce the full depth of the slab, and transfer any stresses equally through the CrackLock and composited concrete.
Have yall seen an update on the slab?
Great job i will be using this method on a job i just got
Jus make sure to follow all manufacturers recomendation and technical specs and you should be good to go. Thanks for watching!
Ryan,
You are always welcome to attend training with us at Rhino! You can contact me directly at jrice@rhinocarbonfiber.com
Ok so its been 3 years so how is it holding up?
Good job
I agree...lol. But it saved the concrete. Anyways, the homeowner placed a deck on top.
Those straps are no match for the weight of that concrete once it starts shifting. And it will.
Don't under estimate the strength of carbon fiber my friend! We all now that no structure or repair lasts for ever but, we do our best to buy home owners more years and delay the big expense of replacement. In my mind, if the repair buys you 5 to 7 years and it costs 1/3 of the replacement price, go for it.
The Concrete CrackLocks represent over 120,000 psi in increased tensile strength. It's an amazing way to add an incredible amount of strength to the concrete
@@oliveraguirreconcreterepai4826 I wouldn't want to put a decorative top on a piece of concrete I expected to fail within 7 years.
The large area where the cracks was the worst...how did you fill that in? From a beginner.
I have cracks want to consult you as my back yard porch is concrete deck cracks
Can you update in the next 2yrs
Shouldn’t the Rest crack be filled with epoxy rather than concrete ?
It can be, but concrete should work depending on how you want it to look
I doubt it. Internal forcer of the concrete still there and eventually find a way to release that pressure. Time to do a new floor.
Hi Jose. We installed the crack locks to hold the crack together and the carbon fiber straps to dicipate the stresses.. repair is 2 years and still holding.
itll hold as a temporary repair but the crack is just going to appear somewhere else because how big the slab is
Hi Luis, thanks for your comment. So the crack lock will stop the main crack. But we where also concerned of the crack reappearing somewhere else, so to prevent that we restricted the movement of the whole slab with the carbon fiber straps. We had to attach carbon fiber straps at almost whole length of the slab. Its been a year now and it is holding good. Lets hope it works!
Oliver Aguirre Concrete ohh i see what you did to prevent it from cracking anywhere else sounds good definitely better than paying for a whole new slab again though
Shouldn’t you cut in some control joints? Or would that not help?
Soil erosion on one side (1:57 2:17)will cause the concrete slab to continue bending. Torsional tension will build up to a point when the concrete can no longer match that of the carbon fiber and explosion will occur.
Is it really effective???
Every situation is different. If you want to prevent splitting. this is a good solution. If the crack is not big, epoxy injection will be your first way to go..
How much something like this cost ?
And how do you charge by foot length? Thanks.
So this type of projects are sold by the project. They are Engineered solutions. Imposible to give a fixed price unless your specific case is evaluated. What I can tell you is that each carbon fiber strip costs about $120 and each crack lock cost about $6. Each lock should be placed about 8" to 12". And all the above need epoxy resins or paste to be fixed into the concrete. Each epoxy cartridge is between 20 to 40 dlls
Simpler services like expansion joint or crack sealing have unit pricing available.
Oliver Aguirre Concrete Repair tomorrow I’m doing a job like 3 times bigger than the one on that video, and some leveling, is going to be fun lol
Hi can we do the concrete on top of carbon fiber
Hi Bala, this is a tricky question. So please don't take this as a definite answer and please do more research about it. But if the carbon fiber is not moving, I am sure you can. Just grind a little the surface, use an epoxy based bonding agent and pour your cementicious material.
Thanks mr Oliver .
I was going to do it with rebar staples
metal rebar staples tend to expand. carbon fiber does not
@@dmon13 thanks
Seems like you guys forgot to fill the joint with sand and epoxy?
Hi Jeremy, in fact we didn't forget. But it was not covered in this video. However, we fill joints based on manufacturers and building recommendations. So for outdoors joints we use a "backer rod-polyurethane sealant system".
There's just no way that gluing straps onto the surface of that slab will make any difference. If that slab wants to move then either the carbon fiber will fail, the epoxy will fail, or the topmost surface layer of the concrete will fail. The crack lock installation looks good though.
The splitting is being controled by the crack locks. The purpose of the fiber straps is to disipate the stresses crated by the crack locks holding the 2 pieces apart. The slab was build by unexperienced contractors, they didn't install enough reinforcement. So far, the repair is holding well.
The concrete becomes a composite so that the two things are no longer separate. Because of that the epoxy and carbon are now a part of the concrete. In addition to compositing, the CrackLocks are also mechanically tied to the slab because of the shape of the CrackLocks.
@@johnnierice6817 You can think of it as a composite but it's still just a strip held on to the outside of the concrete by adhesive. I'm open to experimental evidence to the contrary, but I'd expect that either the strip will fail, the adhesive will fail, or the outermost concrete will ravel, and this will provide almost no support to the slab.
@@wfjhDUI The shape of the CrackLock makes it both mechanical and bond locked. Once the epoxy bonds to the concrete it will transfer the strength of the carbon fiber element to the concrete for tensile resistance.
We continually test applications across our entire company and we haven't seen any issues from either bond failure or mechanical slip. I understand what you are saying, but the data backs up our findings that it is the best solution to prevent the crack from reopening or moving further. And we have then installed in an off ramp in a major freeway. They've been run over millions of times in the last 2 years by everything from motorcycles to 18 wheelers, so I think that we are safe in a backyard slab.
@@wfjhDUI Structural engineers do not agree with you.
2 big bandaids
Interested in the cost of repairing this crack
Cost of materials was near $800 back in 2019. I forgot the labor cost but we spent 1 day for this whole process.
👍
I bet super glue and baking soda would be better to put on top of those straps
Better off demoing the slab and building a deck.
Possibly, but it was a lot of concrete. And it was a backyard. The cost of demolition was not that cheap.
concrete holds water? Oh,Oh! Bust and pour new concrete...
NO WAY will that works to stop that crack. Imagine that the slab on one side of the crack as hanging out in the air off of the side of a building and needed to be supported by those straps. Would it support it? That is exactly what is happening, it is just happening in slow motion. That will not work.
Carbon fiber is stronger than steel. Nowadays many bridges and buildings are reinforced with CFRP. The purpose of the repair was to just stabilize the slab, stop the splitting so a deck could be build on top. It's been 3 years and the repair is still holding up. Soil erosion should be prevented for this repair to work.
@@oliveraguirreconcreterepai4826 Can you do a update video on it?
Not a financially viable option. In this money u could have made a new slab of this size
True! However, it was too complicated to demo and replace the slab. There was dificult access.
@@oliveraguirreconcreterepai4826 yes true 👍🏽
Ugly job
Ugly how? Because you can see the CrackLocks? It's easy to overcoat them with something more pleasing, if the customer doesn't want to see the repair. I have 6 of them in my pool and 3 in my pool deck that you couldn't find without help.
It's a matter of preference on how you finish the slab. This customer was using the slab as support for a finished wooden deck, so it didn't make sense to "pretty it up"
Horrible job
Hi Archie. It was never ment to be beautiful. It was mainly structural. The home ownwer placed a wood deck on top of it and used the fixed concrete as support. Owners just wanted to save the structure.
Ok , but as a contractor I wouldn't leave until it looks good to the eye
But you do what the customer wants
@@archiemegel1013 customer wanted a structural fix, aesthetics where not a problem, as they would follow up with a wood deck on top. We do decortive work as well, but it was not required this time.
Upload some video of the beautiful jobs you do.
Archie,
You can easily add a slip coat or other coating over it to make the repair less visible. We have worked with Sakrete for their Flo-Coat as well as Quikrete. Some contractors also opt for concrete slip coatings, Koolcoat and others. The CrackLock is a subsurface repair so it's very easy to coat over.
ridiculous . typical american band aid approach over minaj engineering practices . This won't fix the fundamental issue of not enough compacted base , to thin of a slab and not enough steel rebar and mesh ,properly supported