I have a driveway that is 30ft wide and 32 foot long. We placed a 6 bag mix with soft fiber and a little over 5in thick. After 32 years no cracks just some top spaling near the road from salt. I have parked trucks with over 60k loads over night on it. I do seal it every two years or so with solvent based sealer. Love fiber.
I use a high solid solvent sealer. It is a penetrating type. I usually wait 30 days for the concrete to cure fully and if you used curing compound for it to come off. Just clean with a pressure washer and wait to fully to dry. Use a solvent safe paint roller to apply sealer. Solvent sealer can be hard to find, EPA rules for home owners etc. But call your concrete suppler for help in locating some.
I'm sure the fiber concrete can take some major load but no cracks or slumping in the concrete driveway can just mean that the base and subbase was prep well and properly.
@@Banned4eva I use if you can find it solvent base penetrating sealer usually comes in 5 gallon containers. Make sure surface is clean and dry. I use a roller for solvent type product. Water base is ok but I am kind of old school and solvent last longer.
I interrupted doing my taxes thinking "what is new in fiber reinforced concrete?", typed "fiber reinforced concrete" into the UA-cam search box, set to sort by upload date. New Tyler Ley video?!? No way! 1:38AM joy!
Caution: rebar sold at many home centers like Lowes ,Home Depot are poor quality not 60ksi not ductile and crack like pencil when bent into hooks etc. Do NOT use in critical structural elements like beams or columns etc Now I see fiberglass rebars there. Obviously cannot be bent or welded . I have complained to Manager and sent a load back to store recently. Ask merchant for paperwork where rebar came from and its certificate of quality strength. We have been using fiber additive on floors walks for decades now. Can affect surface finish if to much added. Excellent channel Thank you 👍
Thank you! I have seen some questionable rebar lately. I agree that everyone needs to keep an eye out of suspect materials. Take care and thanks for watching.
Another good video. What we teach will go on long after we are gone. I used fibers in grout many years ago. It worked very well for leveling. Boys have to play so, I made some concrete balls out of leftovers. They were very tough. Good Luck, Rick
Question Tyler. Essential Craftsman had a video on poured walls where in the form he had nailed thin strips of wood to give the concrete a weakened plane joint to crack. Seemed to make sense to me. Since it was a wall and not a slab, this provided the same as cutting concrete I guess. "Forming Concrete Walls: Ep.17" (about 9 minute mark) Is it a practice or practical to do the same with slabs?
@@BracaPhotoThe wood was not embedded, it would be removed when the forms were taken down. Opposite the wood was for all practical purposes a long piece of angle iron. These two things, one a decorative relief, the wood, from the best I can asses and the angle iron complete the engineered wall to create the weak plane for the concrete to be able to crack in a controlled location or controlled plane. I was interested if this is ever done on slabs. Yes, you cut the top of slabs at certain intervals but do they ever provide an engineered weak spot on the bottom of where you would do your cuts.
This is commonly done in walls. People have tried this in slabs by using an angle iron that is anchored to the base. The cracks that form at the surface don't look as clean as a cut joint. Some people think the non unifom cracks mean that something is wrong with slab. There is another technique called a zip strip that Texas DOT uses to form joints in fresh concrete in bridge decks. It works on a bridge deck because it may only be a few lanes wide. With fibers you can move your joints out to 100' x 100' if you the right amount and type in in the mix.
@@TylerLeyI used to do concrete. about a decade ago I retired from it. I did a few commercial jobs that wanted me to use zip strips, but they were cumbersome to instal and to keep straight. On One project I decided to try something a little bit different; instead of using zip strips, what I did was I bull floated the concrete and then I put a jointer attachment to my bull float and scored joints into the floor where I wanted my zip strips to be then I took the jointer off of my bull floor and floated back over it untill the mark was filled back in with paste, and it was invisible, but it still made a weak point in the slab and later it would crack in a perfectly straight line where I had marked it. it works very well
We just bought this concrete cleaner called Mud Slide from Zepps. It strips everything except what you dont want it to. It is really neat stuff. My boss asked me to pick your brain about it and he would give me a tee-shirt. So my question is what is it in the cleaner that goes after only the concrete and turns it to sludge and does not peel paint, rubber, plastics, etc. and why?
Thanks Tyler. I like your energetic video. Having said about fibers what type of concrete mix design will help reduce or even better stop the surface of the fiber reinforced slab becoming a hairy monster? Should I have add more slump? Should I add more water reducer or plasticizer?
we have been using fibers for over 10 years now, we only use between 2-3kg/m3 using high performance Macro Fibers with a DoP (decleration of performance) of 3kg/m3, we mostly have a great finish and that with low quality concrete here in Indoensia, we even mix fibers into the ready mix truck or site mixer...most important is distribution added 4 minute rotation at high speed...superplasticizer is always recommended, but even in cases were not used by our partner contractors the result is mostly acceptable
In the residential concrete exterior concrete we only use polypropylene monofilament fibers due to best final finish, my understanding is this is for plastic shrinkage only and really doesn’t do much for preventing larger cracks? We typically use rebar 3’oc or 6x6 10ga welded wire and if customers want fiber it would be in addition to the steel reinforcing and extra $$. For me I’m more inclined to use fiber on a hot sunny day otherwise mainly just steel in most cases. Your vid has me thinking I need both Thoughts?
Adding fibers is the way to go. Although, I did walk across a new DG parking lot last week, and it looked like a fox got into the chicken house - feathers (in this case, fibers) were everywhere! Yeah... not the best finish work. Love your videos and the work you do, Dr. Ley!
Thanks for the video! I'd like to see a video about options to increase the flexural strength of concrete, and situations where additional flexural strength would be helpful.
Great show. A few years back you did a demo on cheap hardware 'rebar' that is only a bunch of fibers contained in a plastic tube, that is essentially useless for bearing any loads. But, your episode today got me wondering again: what about braided hemp rope as concrete reinforcement, that is, lengths of hemp rope as a replacement for rebar, in patios and driveways? While there's lots about 'hempcrete' these days as an insulated building material, there isn't anything I can find on the 'net about lengths of hemp rope, itself, used as reinforcement.
Thanks Tyler, I was considering fibre for our 3” layer of SCC on top of our precast floor panels with in-floor heating in our housing project, now it’s settled. BTW, our new Super Air Metre just showed up. What a no-brainer. Thanks man!
Hi! Can you please explain why there are basalt and plastic and fiberglass fibers, and what the differences are? Are some stronger or more/less elastic or cheaper or all of the above? Are the small elastic fibers primarily used to avoid the small surface cracking as you've described in this video or are they popular in other applications? And would the other applications be served better with bigger and/or stiffer fibers? Thank you!
Thanks, Tyler. Would it be possible to spec a mixture of concrete with: • basalt micro fibers • helix steel macro fibers • Wood ash for waterproofing • Zypex additive to fill in eventual micro fractures in the presence of moisture Do people spec out an exact concrete mixture with multiple additives like this? If so, does it need to be signed off by a structural engineer before used to build a residence?
Thanks a lot! Great info really! A question pop out of my head watching the video. So both rebar and fiber dont stop the crack (from load) from forming? I mean the concrete cracks first and the load is transfer into rebars and fiber?
Respected Mr. Ley , please make a detailed video on ways and means to avoid "agglomeration" i.e. "ball formation" of plastic based fibers during mixing of concrete ingredients especially by manual methods. 🙏👍👷
Wow, learning something new again. This sounds like a great solution for many applications. Tell me, do you favor the reinforced rebar over post-tension cabling, for a sport court type application.
From what you were saying in the FRP vs steel video it would bely any strength gains to a smooth surface such as the filaments of fiberglass?? Now you seem to be saying that they do hold even though smooth?
I want to repair wall cracks that are about 1cm. Would using fiberglass concrete make any difference in the repairs rather than just regular concrete? I get that using fiber reinforced concrete when building is a no brainer. But how about repairs?
Hi Tyler, thank you for taking the time to make this channel. I’ve been binge listening to it on my way to work for the last 2 weeks. I’ve worked on the producer side for the last 10 years. I am eager to learn more about the technical side and wanted to know if you have any tips or links for locating educational material? Thanks in advance.
I am experimenting in creating concrete building blocks containing used bottles for all their great properties. Can I use hemp or bamboo fibers rather than plastic or steel? what are their disadvantages ?
Tyler, I have some questions regarding FRC and more specifically SFRC and even more specifically Hybrid ECC using PVA and Helix or HiperFiber or one of the Dramix varieties. Finally, If we use the FEMA P-320 March 2021 eidtion and the October sample plan revision... Can we use Hybrid ECC with Helix and PVA to replace all the rebar.... if not, how much rebar do we need to retain to meet the CLP requirements and the suspended concrete roof requirements?
Love your videos! I’m new in concrete but very keen on the use of add mixtures that are not chemicals in order to control uprisings costs. If I were to use hemp fiber as my reinforcement’s for a slip form operation would it be advisable to pre soak the hemp fibers with the water prior to mixing the wet and dry ingredients to avoid hemp from trapping in oxygen? Thanks in advance
There are also cellulosic fibers which are mitigating the plastic shrinkage cracking dramatically and are comparable to micro synthetic fibers in terms of efficiency and cost.
@@TylerLey Actually We have been working on developing cellulose fiber in real concrete field trials in Canada in the last couple of years and have achieved very interesting results .
Very nice info sir, is possible kindly make a detailing video about colloidal silica used in concrete & nano silica hydro gel for repairing purpose of concrete surface.
I'm planning to do a concrete slab project using Quikrete Crack Resistant Concrete, which has the fibers in it. What do you think about adding an Acrylic Fortifier to this concrete, to further increase the crack and water resistance? I searched through all of your videos and I don't see a single mention of Acrylic fortifiers! So, I'm guessing you don't think much of them? But they do definitely work at the small particle level with grouts and mortars to hold them together, and I like the idea of reducing water penetration into this concrete slab also. So, what are your thoughts about Acrylic fortifiers for concrete? Also, what about adding a water reducer to this mix, to further increase the strength of this concrete slab? Will that work with the acrylic fortifier or will they conflict? You didn't really go into which of the water reducers you though worked best, or name any names, but I was looking at polycarboxylic ether, sold as Melflux 2651 F. Love your videos and expertise, but I do wish you get could get more specific about the names of these products. I know it's different for homeowners going to Lowes and Home Depot as to what is available, but it would really help!
Hi Tyler, thanks a lot for this content, it is useful. I am designing a concrete mix for the foundation/anchor of an ingound basketball hoop. I found some nice, coarse aggregates (ready mix with 0-4mm sand and 4-16mm gravel) and selected a 52.5 strength CEM II cement. There will be 4 rebars in that foundation once I pour the concrete. To get a higher psi/Mpa value I am thinking about a superplastifier + steel macrofibers. Will I get any real benefit, or is all of this only good for slabs?
I talk about fiber orientation towards the end of the video. This isn't really done in practice. There have been some people that have tried but I don't know anything that works consistently.
@@TylerLey I had a similar question. I basically need to build a lintel for a basement window. Wondering if I could just drag a bar through the poured concrete (perhaps working in layers) to encourage the fibers to line up more horizontally before curing. Would it even be worth the effort? Thanks for the excellent videos, btw! Edit: I just found your dedicated fibers video. It doesn't directly address my question but for anyone stumbling across this comment: ua-cam.com/video/OMojB0lzksE/v-deo.html
Pound for pound, fibers are stronger than steel. The difference is you cannot add the poundage of fibers necessary to carry heavy loads because the mix would become saturated with fibers to the point of strength reduction. Conversely, because steel is built in the forms, essentially outside of the mix, you add whatever amount necessary to carry loads.
Mr. Ley can you do a video on glass fiber reinforced polymer bar? I've seen them in the market for some years now (never on an actual job though). But not long ago I got an email from ACI about a seminar of a new spec on how to design with this type of reinforcing, sadly I didn't take it. Thank yoy for your videos!
Galvanized rebar ? Offset layers of four inch cross welded galvanized animal fencing! Galvanized nails? Different sizes... Could this make an expensive but super concrete?
Galvanized rebar exists and there was a previous video involving it. watch?v=xVDy84rR5Z8 He first talks about epoxy coated rebar and the poor performance it has, then mentions that he thinks the best replacement for it is galvanized rebar. Keep in mind that you need a thicker zinc layer than in most other applications because the wet concrete paste reacts with zinc when not fully cured. Galvanized animal fencing might have a thick enough layer, or it might not. Using lower ph and faster curing concrete mix can help.
I have a WW2, 11 cuft mixer and I need to know how to air entrain at home and how does that affect water reducer and why are the fibers for reinforcement so short? shouldn't they be 2" long at least?
You can add air entraining admixtures to the mix. Fibers for hardened concrete are usually 2" long but microsynthetic fibers don't need to be that long.
Also I’ve seen GFRP rebar 10 mm (#3 diameter) and GFRP remesh at 8 mm, but in theory GFRP remesh at 8 mm should be more than equivalent to steel #3 in terms of ultimate tensile strength (1.56x surface area for #3 in steel but 2x tensile for 8 mm in glass fiber)
This is very interesting, I am making a 6” deep footing around the edge of a greenhouse, and I will use fibres in the concrete. Incidentally the background music is annoying and distracting. If you must use it, please have it much quieter.
Few questions regarding fibers. Is there a significant effect of vibrating concrete on the fiber orientation? Does macroplastic fibers creep over time under load? Thanks
Vibrating can impact orientation but it is hard to control or predict. Some people have hypothesized about macrosynthetic fibers creeping but I have never seen it happen in the field. There are macrosynthetic fiber projects have been in place for more than a decade and the fibers are performing well..
the creeping isnt a real issue, but we seen issues in precast when vibration is used, it effects the fiber positioning and distribution, so this needs to be looked at case by case doing your on trials
@@TylerLeySorry if I'm veering into crackpot territory, but I am imagining a large prefab loom of material on a lightweight frame that gets incased in concrete. If carbon fibers are used, they might even be able measure the tension throughout the form. How does that sound?
Actually i say experimental buildings with massive concrete bodies and no rebars. It depends on quantity of fiber in the mix. They used something around 150-200kg of ancored steel fivers per cubic meter. And it proven to be stronger even in rebarless slabs.
And what is the meaning of "small cracks" ? If there is a crack it means concrete is already failed and now rebars are resisting the structure from collapsing
Crack commonly cracks. It is not economical to design concrete not to crack. By using fibers they can keep these cracks smaller and also reduce the load on the rebar. I have another video about this that I will make soon.
the challenge with plastic is the long time durability, thats why environmentalists hate it, but if like in this case not used for single use but as long lasting material plastics can last centuries, especially if not direct exposed to UV and air, thats why fibers are now specifiable under ASTM and Eurocode standards...dont forget steel corrodes, plastic fibers dont, also much higher alkaline/chemical resistance
So basically the job of a rebar is take all the tension after concrete fails so it means before failing of concrete the rebar is doing nothing, Right ?
Is this not simply a case of the construction world including engineers being so terribly conservative and opposed to change? Rebar constructions also fail due to construction errors.
I enjoy your videos but I do not enjoy looking up your nose in ALL OF THEM! It's gross. Are you aware of your camera angle? It's right up there. And when you tilt your head back it's even worse. Super gross. Please do something about that. Thanks! Hope this helps.
This is why I mostly, quietly use NHL3.5@@cmmartti Am trying to kick the habit as I hear its a gateway to going full on Portland. I started off with sly bits of filler where nobody could see & the occasional calk binge, before I knew it I was gypsum crazy & dreaming of wattle & daub.
I work for a manufacturer of steel fibers. The highest performing steel fibers in the world. I am a PE. If you want to talk / have questions let me know. This account is my side hustle business but if you have an email I can email you from my work email.
Thank you Tyler
I'm 68yrs old retired
I wish videos like this were available when I was active.
It took years to learn what you present in minutes
I turn 68 next month, gotta keep movin to keep going. Teach some youngins something
have them do the lifting while you do the telling.
Thank you so much!!! That is such an awesome compliment.
@@2drsdan definitely. youngns want to learn and have the energy, they just need the direction
I have a driveway that is 30ft wide and 32 foot long. We placed a 6 bag mix with soft fiber and a little over 5in thick. After 32 years no cracks just some top spaling near the road from salt. I have parked trucks with over 60k loads over night on it. I do seal it every two years or so with solvent based sealer. Love fiber.
Thanks for the note! That is great that you contiue to seal the driveway. Take care.
What sealer do you use? Penetrating? I have a finer reinforced pour that I just did and would like to do the penetrating type.
I use a high solid solvent sealer. It is a penetrating type. I usually wait 30 days for the concrete to cure fully and if you used curing compound for it to come off. Just clean with a pressure washer and wait to fully to dry. Use a solvent safe paint roller to apply sealer. Solvent sealer can be hard to find, EPA rules for home owners etc. But call your concrete suppler for help in locating some.
I'm sure the fiber concrete can take some major load but no cracks or slumping in the concrete driveway can just mean that the base and subbase was prep well and properly.
@@Banned4eva I use if you can find it solvent base penetrating sealer usually comes in 5 gallon containers. Make sure surface is clean and dry. I use a roller for solvent type product. Water base is ok but I am kind of old school and solvent last longer.
I interrupted doing my taxes thinking "what is new in fiber reinforced concrete?", typed "fiber reinforced concrete" into the UA-cam search box, set to sort by upload date.
New Tyler Ley video?!? No way! 1:38AM joy!
Caution: rebar sold at many home centers like Lowes ,Home Depot are poor quality not 60ksi not ductile and crack like pencil when bent into hooks etc.
Do NOT use in critical structural elements like beams or columns etc
Now I see fiberglass rebars there.
Obviously cannot be bent or welded .
I have complained to Manager and sent a load back to store recently.
Ask merchant for paperwork where rebar came from and its certificate of quality strength.
We have been using fiber additive on floors walks for decades now.
Can affect surface finish if to much added.
Excellent channel Thank you 👍
Thank you! I have seen some questionable rebar lately. I agree that everyone needs to keep an eye out of suspect materials.
Take care and thanks for watching.
Sounds like everyone should bend a sample 180° to verify ductility or reject the batch.
I wish I felt as passionate about anything as this guy does about concrete.
Thank you so much for your videos Tyler! I'm not a professional but an interested lay person and I just love the info you share. Thank you!
Thanks so much! Thanks for watching!!!
Another good video. What we teach will go on long after we are gone. I used fibers in grout many years ago. It worked very well for leveling. Boys have to play so, I made some concrete balls out of leftovers. They were very tough. Good Luck, Rick
Even my wife and kids understand fibers now, another well explained video, Tyler!
Question Tyler. Essential Craftsman had a video on poured walls where in the form he had nailed thin strips of wood to give the concrete a weakened plane joint to crack. Seemed to make sense to me. Since it was a wall and not a slab, this provided the same as cutting concrete I guess. "Forming Concrete Walls: Ep.17" (about 9 minute mark) Is it a practice or practical to do the same with slabs?
@@BracaPhotoThe wood was not embedded, it would be removed when the forms were taken down. Opposite the wood was for all practical purposes a long piece of angle iron. These two things, one a decorative relief, the wood, from the best I can asses and the angle iron complete the engineered wall to create the weak plane for the concrete to be able to crack in a controlled location or controlled plane. I was interested if this is ever done on slabs. Yes, you cut the top of slabs at certain intervals but do they ever provide an engineered weak spot on the bottom of where you would do your cuts.
This is commonly done in walls. People have tried this in slabs by using an angle iron that is anchored to the base. The cracks that form at the surface don't look as clean as a cut joint. Some people think the non unifom cracks mean that something is wrong with slab. There is another technique called a zip strip that Texas DOT uses to form joints in fresh concrete in bridge decks. It works on a bridge deck because it may only be a few lanes wide.
With fibers you can move your joints out to 100' x 100' if you the right amount and type in in the mix.
@@TylerLeyI used to do concrete. about a decade ago I retired from it. I did a few commercial jobs that wanted me to use zip strips, but they were cumbersome to instal and to keep straight. On One project I decided to try something a little bit different; instead of using zip strips, what I did was I bull floated the concrete and then I put a jointer attachment to my bull float and scored joints into the floor where I wanted my zip strips to be then I took the jointer off of my bull floor and floated back over it untill the mark was filled back in with paste, and it was invisible, but it still made a weak point in the slab and later it would crack in a perfectly straight line where I had marked it. it works very well
We just bought this concrete cleaner called Mud Slide from Zepps. It strips everything except what you dont want it to. It is really neat stuff. My boss asked me to pick your brain about it and he would give me a tee-shirt. So my question is what is it in the cleaner that goes after only the concrete and turns it to sludge and does not peel paint, rubber, plastics, etc. and why?
Thanks Tyler. I like your energetic video. Having said about fibers what type of concrete mix design will help reduce or even better stop the surface of the fiber reinforced slab becoming a hairy monster? Should I have add more slump? Should I add more water reducer or plasticizer?
we have been using fibers for over 10 years now, we only use between 2-3kg/m3 using high performance Macro Fibers with a DoP (decleration of performance) of 3kg/m3, we mostly have a great finish and that with low quality concrete here in Indoensia, we even mix fibers into the ready mix truck or site mixer...most important is distribution added 4 minute rotation at high speed...superplasticizer is always recommended, but even in cases were not used by our partner contractors the result is mostly acceptable
In the residential concrete exterior concrete we only use polypropylene monofilament fibers due to best final finish, my understanding is this is for plastic shrinkage only and really doesn’t do much for preventing larger cracks? We typically use rebar 3’oc or 6x6 10ga welded wire and if customers want fiber it would be in addition to the steel reinforcing and extra $$. For me I’m more inclined to use fiber on a hot sunny day otherwise mainly just steel in most cases. Your vid has me thinking I need both
Thoughts?
Adding fibers is the way to go. Although, I did walk across a new DG parking lot last week, and it looked like a fox got into the chicken house - feathers (in this case, fibers) were everywhere! Yeah... not the best finish work.
Love your videos and the work you do, Dr. Ley!
Thanks for the video! I'd like to see a video about options to increase the flexural strength of concrete, and situations where additional flexural strength would be helpful.
Thanks Ron! I will think about it.
I love the message and energy of this video! It was perfect
Good explanation now I can better articulate what I need my customers to understand
Great show. A few years back you did a demo on cheap hardware 'rebar' that is only a bunch of fibers contained in a plastic tube, that is essentially useless for bearing any loads. But, your episode today got me wondering again: what about braided hemp rope as concrete reinforcement, that is, lengths of hemp rope as a replacement for rebar, in patios and driveways? While there's lots about 'hempcrete' these days as an insulated building material, there isn't anything I can find on the 'net about lengths of hemp rope, itself, used as reinforcement.
Intereting idea. I will see if I can find some hemp reinforcement for future testing.
@@TylerLey It would be interesting to see how a strong synthetic rope performs as well. Something like Dyneema (UHMwPE).
Wow-- thank you for your acknowledgement, Dr. T!@@TylerLey
Thanks Tyler,
I was considering fibre for our 3” layer of SCC on top of our precast floor panels with in-floor heating in our housing project, now it’s settled.
BTW, our new Super Air Metre just showed up. What a no-brainer.
Thanks man!
Hi! Can you please explain why there are basalt and plastic and fiberglass fibers, and what the differences are? Are some stronger or more/less elastic or cheaper or all of the above? Are the small elastic fibers primarily used to avoid the small surface cracking as you've described in this video or are they popular in other applications? And would the other applications be served better with bigger and/or stiffer fibers? Thank you!
I will talk more about this in another video. All fibers reduce cracking but some perform better than others.
@@TylerLey Particularly looking forward to any field data on how basalt fiber is working in real world projects…
@@TylerLey Awesome! Thank you! On a side-note, I'd like to use fiber-reinforced concrete to make pottery without a kiln. Any suggestions are welcome!
I bought some plaster/concrete pots but in my experience they tend to fall apart very quickly. I'd like to make some that are of good quality.
Thanks, Tyler. Would it be possible to spec a mixture of concrete with:
• basalt micro fibers
• helix steel macro fibers
• Wood ash for waterproofing
• Zypex additive to fill in eventual micro fractures in the presence of moisture
Do people spec out an exact concrete mixture with multiple additives like this? If so, does it need to be signed off by a structural engineer before used to build a residence?
Thanks a lot! Great info really!
A question pop out of my head watching the video.
So both rebar and fiber dont stop the crack (from load) from forming? I mean the concrete cracks first and the load is transfer into rebars and fiber?
What about combining two or more types of fibers in concrete? What impact does higher PSI concrete have on fiber benefits?
Great video 👍🏽
How much fiber I would put in a 5sand 1 cement mix
Thank u
Any suggestion on how to fix a pier which cracked due to efflorescence and how to avoid for future robustness
Any vids on polymer reinforced?
Do you have a video on adding small styrofoam balls to Concrete?
Respected Mr. Ley , please make a detailed video on ways and means to avoid "agglomeration" i.e. "ball formation" of plastic based fibers during mixing of concrete ingredients especially by manual methods. 🙏👍👷
Look for a future video where I talk about some of these.
@@TylerLey i appreciate your prompt response.👷👍🙏
Wow, learning something new again. This sounds like a great solution for many applications. Tell me, do you favor the reinforced rebar over post-tension cabling, for a sport court type application.
From what you were saying in the FRP vs steel video it would bely any strength gains to a smooth surface such as the filaments of fiberglass?? Now you seem to be saying that they do hold even though smooth?
I use both fiber and steel with top and bottom reinforcing.
Overkill always works.
⬆️ this is the kind of person I want in charge of everybody's concrete
Easier AND cheaper to overbuild it now than it is to fix it in 50 years!
What is the top and bottom reinforcement? Mesh?
I want to repair wall cracks that are about 1cm. Would using fiberglass concrete make any difference in the repairs rather than just regular concrete? I get that using fiber reinforced concrete when building is a no brainer. But how about repairs?
Hi Tyler, thank you for taking the time to make this channel. I’ve been binge listening to it on my way to work for the last 2 weeks. I’ve worked on the producer side for the last 10 years. I am eager to learn more about the technical side and wanted to know if you have any tips or links for locating educational material? Thanks in advance.
What about recycling?
How do you get them out of the concrete if it gets broken in a crusher?
Heat.
not an energy-efficient way if you ask me. and doesn't it release harmful substances?@@elmerkilred159
Heat will melt them. I am not sure why you would need to get them out of the concrete. The crusher can still break them up but it may take more work.
Could you do a video on autoclaved aerated concrete (AAC & ALC)?
I am experimenting in creating concrete building blocks containing used bottles for all their great properties. Can I use hemp or bamboo fibers rather than plastic or steel? what are their disadvantages ?
Tyler, I have some questions regarding FRC and more specifically SFRC and even more specifically Hybrid ECC using PVA and Helix or HiperFiber or one of the Dramix varieties. Finally, If we use the FEMA P-320 March 2021 eidtion and the October sample plan revision... Can we use Hybrid ECC with Helix and PVA to replace all the rebar.... if not, how much rebar do we need to retain to meet the CLP requirements and the suspended concrete roof requirements?
Is it a good idea to use FRP rebars also with macro fibers
What about stainless steel rebar to prevent corrosion? Appreciate all your work. I love this stuff.
Love your videos! I’m new in concrete but very keen on the use of add mixtures that are not chemicals in order to control uprisings costs. If I were to use hemp fiber as my reinforcement’s for a slip form operation would it be advisable to pre soak the hemp fibers with the water prior to mixing the wet and dry ingredients to avoid hemp from trapping in oxygen? Thanks in advance
There are also cellulosic fibers which are mitigating the plastic shrinkage cracking dramatically and are comparable to micro synthetic fibers in terms of efficiency and cost.
Thanks for the note. I don't know a lot of people that use these in practice.
@@TylerLey Actually We have been working on developing cellulose fiber in real concrete field trials in Canada in the last couple of years and have achieved very interesting results .
Very nice info sir, is possible kindly make a detailing video about colloidal silica used in concrete & nano silica hydro gel for repairing purpose of concrete surface.
Great cement. Portland. but seems to have a few unanswered questions. Thank you.
Ha! I agree that there is a lot we don't know about portland cement. So much to learn!!!
I'm planning to do a concrete slab project using Quikrete Crack Resistant Concrete, which has the fibers in it.
What do you think about adding an Acrylic Fortifier to this concrete, to further increase the crack and water resistance?
I searched through all of your videos and I don't see a single mention of Acrylic fortifiers! So, I'm guessing you don't think much of them? But they do definitely work at the small particle level with grouts and mortars to hold them together, and I like the idea of reducing water penetration into this concrete slab also.
So, what are your thoughts about Acrylic fortifiers for concrete?
Also, what about adding a water reducer to this mix, to further increase the strength of this concrete slab? Will that work with the acrylic fortifier or will they conflict?
You didn't really go into which of the water reducers you though worked best, or name any names, but I was looking at polycarboxylic ether, sold as Melflux 2651 F.
Love your videos and expertise, but I do wish you get could get more specific about the names of these products. I know it's different for homeowners going to Lowes and Home Depot as to what is available, but it would really help!
Hi Tyler, thanks a lot for this content, it is useful. I am designing a concrete mix for the foundation/anchor of an ingound basketball hoop. I found some nice, coarse aggregates (ready mix with 0-4mm sand and 4-16mm gravel) and selected a 52.5 strength CEM II cement. There will be 4 rebars in that foundation once I pour the concrete. To get a higher psi/Mpa value I am thinking about a superplastifier + steel macrofibers. Will I get any real benefit, or is all of this only good for slabs?
Are you Frankie MacDonalds brother?
Hello Dr. Tyler! I'm really a fan of you. Please make a video discussing the aggregate size effect on concrete strength. Take love❤
Is the fiber reinforced Quikcrete pretty good? Or do we have to add in our own fibers?
How about CONTROLLED positioning and orientation of fibers?
I talk about fiber orientation towards the end of the video. This isn't really done in practice. There have been some people that have tried but I don't know anything that works consistently.
@@TylerLey Fibers are oriented in plastics by controlled elongation.
@@DavidFMayerPhD maybe magnets can be used?
@@alex-lu8mi Good idea for steel fibers.
@@TylerLey I had a similar question. I basically need to build a lintel for a basement window. Wondering if I could just drag a bar through the poured concrete (perhaps working in layers) to encourage the fibers to line up more horizontally before curing. Would it even be worth the effort?
Thanks for the excellent videos, btw!
Edit: I just found your dedicated fibers video. It doesn't directly address my question but for anyone stumbling across this comment: ua-cam.com/video/OMojB0lzksE/v-deo.html
Pound for pound, fibers are stronger than steel. The difference is you cannot add the poundage of fibers necessary to carry heavy loads because the mix would become saturated with fibers to the point of strength reduction. Conversely, because steel is built in the forms, essentially outside of the mix, you add whatever amount necessary to carry loads.
Mr. Ley can you do a video on glass fiber reinforced polymer bar?
I've seen them in the market for some years now (never on an actual job though).
But not long ago I got an email from ACI about a seminar of a new spec on how to design with this type of reinforcing, sadly I didn't take it.
Thank yoy for your videos!
Galvanized rebar ?
Offset layers of four inch cross welded galvanized animal fencing!
Galvanized nails? Different sizes...
Could this make an expensive but super concrete?
Galvanized rebar exists and there was a previous video involving it.
watch?v=xVDy84rR5Z8
He first talks about epoxy coated rebar and the poor performance it has, then mentions that he thinks the best replacement for it is galvanized rebar. Keep in mind that you need a thicker zinc layer than in most other applications because the wet concrete paste reacts with zinc when not fully cured. Galvanized animal fencing might have a thick enough layer, or it might not. Using lower ph and faster curing concrete mix can help.
@@5467nick You nailed it. Thanks for your help!
Which fibers are the best?
I have a WW2, 11 cuft mixer and I need to know how to air entrain at home and how does that
affect water reducer and why are the fibers for reinforcement so short? shouldn't they be 2"
long at least?
You can add air entraining admixtures to the mix. Fibers for hardened concrete are usually 2" long but microsynthetic fibers don't need to be that long.
Do a video on remesh vs rebar!
Also I’ve seen GFRP rebar 10 mm (#3 diameter) and GFRP remesh at 8 mm, but in theory GFRP remesh at 8 mm should be more than equivalent to steel #3 in terms of ultimate tensile strength (1.56x surface area for #3 in steel but 2x tensile for 8 mm in glass fiber)
This is very interesting, I am making a 6” deep footing around the edge of a greenhouse, and I will use fibres in the concrete. Incidentally the background music is annoying and distracting. If you must use it, please have it much quieter.
Few questions regarding fibers. Is there a significant effect of vibrating concrete on the fiber orientation? Does macroplastic fibers creep over time under load? Thanks
Vibrating can impact orientation but it is hard to control or predict. Some people have hypothesized about macrosynthetic fibers creeping but I have never seen it happen in the field. There are macrosynthetic fiber projects have been in place for more than a decade and the fibers are performing well..
the creeping isnt a real issue, but we seen issues in precast when vibration is used, it effects the fiber positioning and distribution, so this needs to be looked at case by case doing your on trials
Hi Dr. Tyler, how about graphene oxide for concrete reinforcement. Do you have any experience or studies you could post on your chanel? Thank you
What I meant is can graphene replace fibers? Or it serves as different reinforcement?
Why don't we use very long strands of aligned fiber instead of rebar?
It is hard to orient them in the concrete.
@@TylerLey Long strands like ropes. Laying the ropes would be like weaving vs rebar tying.
@@TylerLeySorry if I'm veering into crackpot territory, but I am imagining a large prefab loom of material on a lightweight frame that gets incased in concrete. If carbon fibers are used, they might even be able measure the tension throughout the form. How does that sound?
The answer is yes sometimes. But the video is probably worth watching!
Actually i say experimental buildings with massive concrete bodies and no rebars. It depends on quantity of fiber in the mix. They used something around 150-200kg of ancored steel fivers per cubic meter. And it proven to be stronger even in rebarless slabs.
hey tyler, your nephew sam told me you were like THE concrete sommelier. Turns out you know a lot of about concrete
And what is the meaning of "small cracks" ? If there is a crack it means concrete is already failed and now rebars are resisting the structure from collapsing
Crack commonly cracks. It is not economical to design concrete not to crack. By using fibers they can keep these cracks smaller and also reduce the load on the rebar. I have another video about this that I will make soon.
do synthetic fibers decay over time? (like many decades?)
the challenge with plastic is the long time durability, thats why environmentalists hate it, but if like in this case not used for single use but as long lasting material plastics can last centuries, especially if not direct exposed to UV and air, thats why fibers are now specifiable under ASTM and Eurocode standards...dont forget steel corrodes, plastic fibers dont, also much higher alkaline/chemical resistance
ane research area is available for us.
So basically the job of a rebar is take all the tension after concrete fails so it means before failing of concrete the rebar is doing nothing, Right ?
It does a little but not very much.
Please make a video about fondag concrete!
This is a calcium aluminate cement. I talk about these in a past video but I agree that an update is probably in order.
Add SBR to the Concrete Mix💪
Is this not simply a case of the construction world including engineers being so terribly conservative and opposed to change? Rebar constructions also fail due to construction errors.
Why not use asbestos fibers 😅
The music takes away from the presentation. It's a useless distraction.
What about using galvanized nails. Surely would be expensive. Could it make a super concrete?
Pr-stressed concrete slabs used tightened steel cables like giant guitar strings.
I've never seen nail proof concrete boots...
👍Hello concrete freaks and maniacs ✌
HI!!! Thanks for watching.
Small cracks make self healing concrete more effective
why not both?
EDIT: yet again I didn't watch to the end :D
I enjoy your videos but I do not enjoy looking up your nose in ALL OF THEM! It's gross. Are you aware of your camera angle? It's right up there. And when you tilt your head back it's even worse. Super gross. Please do something about that. Thanks! Hope this helps.
" M " to mute
Consider working on kids Television ?
Most adults dislike people shouting at cameras on here.
Concrete freaks do. Concrete freaks looove concrete.
This is why I mostly, quietly use NHL3.5@@cmmartti
Am trying to kick the habit as I hear its a gateway to going full on Portland.
I started off with sly bits of filler where nobody could see & the occasional calk binge, before I knew it I was gypsum crazy & dreaming of wattle & daub.
perhaps you are too child like to see this is concrete jesus
trim your nose hairs.
I work for a manufacturer of steel fibers. The highest performing steel fibers in the world. I am a PE. If you want to talk / have questions let me know. This account is my side hustle business but if you have an email I can email you from my work email.
Steel fibres are better than glass?
@@noahfleming7887 for heavy industrial slabs of course. For something architectural maybe not