I'm developing my master's degree tesis on this topic and academic stress helped to make me forget the beauty of this topic. Your passion, sir, gave me a fresh breath and remainded me this is AWESOME. Thank you for your video and keep on being a passionate concrete freak!
I've had a garage floor that needed to make up a 1/2" gain in height- we mixed in fiber (fiberglass strand type) and trowed to a smooth finish. While not directly exposed to the elements, it has had cars, trucks, etc. worked on with jack stands, etc for over 10 years. still holding up well, in the freeze/thaw climate.
Tyler, that will be a hard one, but I will try to check. it wasn't that much, because it was actually mixed by hand. I will try to find the left over packets of fiber, but I think it was roughly one ounce to 50lb dry, course sand, no klinker. I love your channel!
I only wanted to see what a fiber cement looks like but I ended up watching the entire video lol. This is so informative and the way it is presented really made me interested. Thanks for this!
It was my grandfather who designed this with his friend and patented it. True story however I think it’s been changed over the years because it was done with stainless steel pins when they made it
Thanks Tyler for your quality videos. I am a retired contractor now full time artissn / craftsman in deep play with cementious materials. I just recently did your channel and would like to express grattitude for your enthusiasm and willingness to share. Thanks
Hey Tyler, here is AU I came across fiberglass woven mat where the woven strands are every 2mm and is a 6 oz mat. I've used these in garden bed walls that can be walked on with heavy wheel barrows. 20 years on and not a crack. Basically I lay 30-40 cm of concrete then the first mat, another 40cm concrete and second mat and keep going to the relevant height required.
Concrete tunnel liner segments use polyethylene fiber for fire protection. It does not hold the concrete together but rather melts allowing space for the concrete to expand without as much damage.
We casted around 12 column using fiber reinforced concrete in both pcc and rcc. The fibers were actully prety coool. The cracks were minimised and ductility improved . We used 3d hookedend fibers.
Hey great info. What would you do for a Barndominium concrete slab where half the building will be habitable and concrete will be polished with underfloor heating and the other half will be garage/workshop.
Ryszard, This is a good question. In my opinion there is not a lot of good data on this. Most testing has focused on the strength of the fiber reinforced concrete after it has cracked. I am not sure this is really what is important. I think it is better to focus on how well the fibers can keep the cracks small. Also, most of the testing is from external loading. Very little work has been done to investigate the performance in cracking from freeze thaw or drying shrinkage. While is known that the micro fibers only really help at early ages, no one has really quantified how much they help. We are starting to work a lot with fibers in my lab and so stay tuned for more details.
@@Veldtian1 All the companies listed on the Fiber Reinforced Concrete Association (fiberreinforcedconcrete.org/) are great suppliers of quality plastic fibers. Check out the site!
I know basalt does not rust, expand, or corrode like steel, is ultimately stronger yet extremely brittle, failing abruptly. Specifically, basalt is less rigid (1/3) than steel rebar in the steel's elastic sense, but has a much higher ultimate strength. But when it does fails it does so abruptly and totally. There is little warning, so safe evacuation of structures is dependant on active monitoring of abnormal stress, which requires planning and fidelity. Basalt fabric has properties that have not been properly exploited by industry. It can be placed at the surface of concrete so that it's tensile strength minimizes initial cracking. However _prestressing basalt_ fabric has not been investigated enough.
This was helpful. I want to pour concrete in a thin, half-inch mold, but Ai didn't know whether this would help. I guess it won't prevent it from cracking, but it might help it from splitting? I'll still try it out and see how much it helps.
After learning all about concrete over the past few years from watching and rewatching your videos (among others) I'm now standing here in Costco having an aneurysm that they didn't fiber reinforce their beautiful densified concrete floor! So many cracks!!!!
I need to patch several pot holes in a parking lot. The traffic is light but there is forklift, 4000Lb, and tractor trailer deliveries. Would fiber reinforce concrete say 4-6 inches in the bottom of the pothole with asphalt patch on top work? This is in a desert environ, southern Utah, very little rain and hotter than hell in the summer.
Hi, Mr. Ley. I have not used fibers in my projects, but for my civil engineering materials end of semester presentation, I may summarize some of the current research of fiber reinforced concrete. Your video has inspired me and helped me to select my topic.
Dear Professor Ley, thanks a lot for your video. Now that you talk about fibers we are making concrete, we are making concretes with Waste to Energy Ash, we use ash instead of sand and aggregates, this is big because all the ash is pozzolan. Concretes made with this type of waste are Photocatalytic meaning help breakdown air pollution and are impermeable and self-healing and yes, they have micro-reinforcement.
Careful with ash, especially fly ash from coal burning electric plants. Home Depot learned that the hard way years ago near Richmond VA when their contractor used 30% fly ash in the foundation and floor slab for a new HD store. If memory serves, some of the metal shelving posts broke through the new floor when they stocked them. The entire building was condemned and razed so they could start over.
Im going to use both Owens Corning 32-500 fibers and a fiberglass rebar grid in my wood stove hearth. Im hoping it will increase the strength and minimize cracks.
Dr Ley, I have been getting push back from Contractors especially on slab on grade application. There argument is it is challenging to finish, like you showed on your video. I like the video it is truly helpful.
Try adjusting the paste volume of your mix with fibers. Make a designated mix design with fiber built in. I find a 30-35% paste volume works well with typical macrofiber
@lackoffkgivity most of these issues can be fixed with paste volume and using clean aggregate Also don’t throw all the fibers in at once. Do one bag at a time slowly
Hi, I just had a 5" fiber reinforced concrete slab poured for my future garage. Do I need to wait a MONTH to stain and seal it? Thanks so much for any information!!!
I specified fiber reinforced concrete once. It was a pad for a portable MRI at a hospital. It was moved from place tp place in a semitrailer. I wanted to keep iron or steel away from near it because that would affect the image and the machine would have to be “shimmed” or adjusted each time it was parked before it was used.
I am planning to make a small drainage. 50 ft in length, 6 inches wide, 2 inches side wall, and 1 inch thick. Do i need these fibers or should i just use 1"x1" wire mesh?
Thanks for the helpful videos. For building sculptures, I was hoping I could shred my own recycle plastics to use as macrofibers. Any reason not to do that?
Do you put a thin layer of concrete without fibers, for example, in a mold, then add more with fibers? Otherwise, the fibers may be seen on the surface.
Hello Tyler Ley @2:20 you said fibers do not stop the cracks from forming. How I think of it is, macro-fibers do not stop the macro-cracks from forming and micro-fibers do not stop the micro-cracks from forming. But macro-fibers added with micro-fibers can help a lot. Micro-fibers will help the micro-cracks to not propagate into macro-cracks. This is just my opinion. What do you think about this? Would love to hear from you. Thanks.
Hey Tyler! I have a question regardinf how to reinforce concrete object. Let's say I'll make weight plate with 45cm diameter and 5cm thickness with hole in the center. What if I add steel chicken wire surounding the plate plus Chopped Stranded Mat fiberglass on the mixing. Will they make a better strength or just use either one instead? Thanks in advance.
What type of fibers should I use when making concrete Atlas Stones for strongman challenges/competitions? These range in size from 10" to 24" in diameter. Was looking at Basalt and Polypropylene - either of these better than the other for an application like this? And what length of fiber - seeing 19mm, 36mm and 50mm as options from Amazon suppliers. Thanks!
Have you considered for steel fibers using magnetic flux field to align the fiber direction. Example is iron particles on paper that have a magnetic field extending through the paper shows the alignment. So assume that you can lay the concrete into a form in the direction that you want the fiber majority to be aligned to. One way of aligning them is a use a tube with DC current flowing through wire wrapped around the tube. The flux field will be parallel to the axis of the tube and flow direction.
I would think the density of concrete would require a very strong magnetic field and that would draw the fibers to that side of the pour. Remember your example is in a very nonresistive medium(air) and the filings are being kept separated from the magnetic source by the (relatively) strong paper.
Thanks Thomas! William is right, it is very hard to get the fibers to align where you want them to. Also you need a very strong magnet. However, maybe somebody can figure this out. Someone should try and make it happen.
Maybe magnetic alignment could work whilst the concrete is being vibrated, because everything would be more mobile. Interesting idea. Test it yourself and make a video :)
Metal in concrete is a bad idea especially in humid climates. Metal will expand and contract causing cracks. That and metal rusts like a bitch in concrete because of water.
A long long time ago, I saw a "futuristic wall" on a tv show, and it was just concrete with a lot of glass fibers in it, and in the day time, the wall would actually sorta glow as it let some light through it.
Tyler, it's been too long, glad to see this post AND it's on a question I ask you about quite awhile ago. Awesome video, worth the wait! Thanks for continuing to teach us about concrete. Never would have guessed how complex and interesting a subject, concrete is. Can't wait for more!
Dear prof. Ley, My name is Jang. I'm college student in Korea, University of Seoul. I'M REALLY DOPPED in your channel about conc. Now, i'm in major of UHPC(Ultra high performance concrete) and its piezoresistivity. If you don't mind, would you upload a clip about UHPC on TH-cam? Thank you for reading my direct message :)
7-VII-2021.We artist have been using fibers in our clay plaster and concreat sence the the Renaissance, today we have green strenth and fired strenth fibers, in Malta my Greath Grand father pionerded the usage of fibers in concrete back in 1906. Much more to tell you about.
Love the video!!! Thanks for getting the word out on fibers! And FORTA is always willing to help with tips on finishing . We have seen many amazing finished floors over the years... that still look great!
Thanks so much for the comments. Also, thanks for providing fibers for my students to use in my lab. It would be cool to learn more about finishing with fibers.
Reminds me of horsehair plaster! Is there a method of aligning the fibers to control the way they will support stress? Perhaps running some sort of comb through the wet concrete in a single direction?
Read about James Hardie and CSR here in Australia, Asbestos fibre was used extensivelly here in fibre reinforced cement, basiclly every house was built using it at the time
Thought: if you poured a few inches of concrete, and then placed a sheet of fiberglass in the area of the most stress, and then repeated, concrete and glass sheets? This would be instead of random fibers, and would be in addition to rebar.
Would it be smart to add a top coat of some sort of using fiber-reinforced concrete for residential floors (without any tile or other additional surface materials)?
Thanks a lot Tyler. Love the way how you make complex topics simple. I had one question though. What if we use Glass fibre mesh instead of the fibres? Will it solve the alignment problem?
In the info given for the amount of macrofibers to use, for steel, (I guess like wires? chickenwire for my sculptures?) it is told as "2x" or explained as "about twice as high" to quote the video. I don't get this. 2x what? what does this mean?
hey Tyler. I'm a concrete finisher and so glad i found your channel. question:. why would my concrete driveway crack right next to a control joint months after we poured it. thanks.
Just had a contractor extend my back patio. I wasn’t aware of this “microfiber” method. When they were done and I lifted up the tarp it looked like a bunch of grass was embedded in it turns out this stuff is the microfiber. The contractor told me that they will eventually go away is this true? It looks pretty bad at the moment
A lot of engineers don't like specifying fibers since there is no code requirement and they don't want to increase construction expenses. You need an economic argument for the client to accept the specification. What are the economic advantages to fiber reinforces concrete? What is the relationship between fiber reinforcing and corrosion? Can fiber reinforcement help reduce corrosion in parkades where there is freeze-thaw and lots of salt?
Thanks Andrew, I agree that more work needs to be done on this to get the data that you want. Right now the fiber companies are relying on engineers that want to create concrete with less cracks. It is like all the extras on an ice cream sundae beyond the ice cream. You don't need them but they sure make it better. I guess the question is whether cracking is important to your structure. If it is then you should consider adding fibers.
Lower rebar placement labor is why I'm starting to use it in residential foundations and walls. Going from a #5 12" mesh to 20lb a yard steel fiber if i remember right
Wanna pick your brain on this subject. so what if rebar corrodes? I read somewhere that only the exterior surface corrodes but the rebar core remains strong. The surface corroded layer also prevents the core from getting corroded. So is rebar corrosion really cause of concern for structural failure? Thanks in advance and hope to hear your thoughts on this!
We like to use micro fiber on our slabs regardless we have rebar or WWM -- have not tried @ a column and beam levels before... will look to try on our next pour
I first saw and heard and about fibers in 1993. My understanding was that it was a replacement for concrete wire (the 6"x6" grid wire about 5' wide that comes rolled up and a pain in the ass to handle; yeah that concrete wire).?. Which is used to resist shrinkage and freeze/thawing cracks, not necessarily loads. That's what the rebar is for..? what do you say about that?
Can you still seal micro fiber concrete. I recently had a patio poured and it has microfibers. I can see them. It is also dusting due to poor prep by my contractor. This is why I want to seal it. I greatly appreciate any response and knowledge.
I have an outdoor pathway, I'm using 6 sack concrete mixing myself. I would like to have these pathways about 1 inch thick. From your video's I think both wire mesh and microfibers would work best? Steps I will use: integrate microfibers in the wet concrete, pour a 1/2 inch put the wire mesh down, then pour the top coat? Is that the best method?
super light concrete could potentially benefit from fibers: organic, natural, metalic , wich will last longer? concrete absorbs humidity and stores it?
I live near the beach where much of soil is sandy. Also, it is wet. I leve near wetlands, maybe 50 feet from where I wanrt to put a concrete pad for a carport/garage. ANt recommendations, tips on things a rookie like me needs to look out for in terms of fiber, or rebar. Any tips at all?
We are pouring a 1 to 6 inch topping slab on a WWT plant containment SOG. 130 foot x 100 foot. 4 foot high containment wall all around. All concrete has rebar, topping slab has microfiber reinforcement. Trench drain along centerlines.
clearly explained, thanks. I am trying to decide if i should use steel mesh or fibers in my 10 inch tubes for the footers under my shed. I am in savannah, so there is no frost line, and my footers are not very deep.
I need to make some concrete plate weights for workout lifting purposes 🏋🏼. Some sold molds come with a metal loop & what appears to be plastic fibers. I’ve seen dudes use rebar. I heard of some kind of a metal mesh being used. I imagine it was 2 pieces cut to weight size, 1 placed after the initial surface layer of concrete is applied, & a second piece applied more towards the top beneath the top finishing layer of concrete. I imagine I’ll spray finish them with rubberized flex spray. I also imagine I’ll replace the pvc inserts with steel. Any suggestions if plastic or metal fibers would work better? Should I use rebar or mesh as well? I’ll definitely have to buy a scale due to additions altering dimensions of weight density distributions. Thanks for the info 👍🏻
Pardon my naivete, but if you use macro fiber, could you use nylon rope instead of steel rebar? (Re: I'm looking for a way to build a single person one-floor-at-a-time DIY 10-story residential where the logistics are single person easy - no rebar, no pre-tensioning, just rope and fibers delivered in rolls and bags, respectively. ???)
Hello sir I am pursuing Masters of engineering ,and my dissertation topic is GFRP as rebar in concrete, and I choose to cast one way slab using GFRP rebar. But don't clear the design philosophy, I read the ACI 440 code but never clear from it . So please share something on it Thanking you
Here's the question though... why do they use loose, mixed-in macro fibers instead of woven cloth with pre-tension? we already do pretension with rebar on foundations and bridges etc. I imagine if they did that with the fiber, ie putting some fiber tow into the concrete and applying tension during curing... wouldn't that be a simple step to ad a whole lot more toughness?
Micro fibers= cracks 1-6 hours Macro fibers= cracks days to years I used to be a driver now I'm a batch man so I'm watching all your videos on concrete so I can sound smarter 😁
What if you added a sheath of reinforcing material around the concrete, like covering it in carbon fiber composite, creating a honeycomb. The composite would take the normal forces and the concrete could be the web and take the shear forces. Aerospace engineer here, so I don't know diddly squat about concrete, just wondering.
Thanks for all your videos, I am planning a workshop build and every concrete contractor has a different idea of what would be best. Educating myself with your videos are helpful through this process. Do you have any videos or insight on how in Slab radiant heat with under slab insulation effects concrete? Thanks again.
Thanks fir explaining about fibers. I make concrete flower pots, flowers, and crafts, etc. I put a lot of work and details in them and would like to make them stronger. Please yell me which is best to use. Many thanks!😊
I made an updated version of this video. Check it out here!
th-cam.com/video/WHQViwxqxdQ/w-d-xo.htmlsi=AlbzwdNrPQfpDpVR
I'm developing my master's degree tesis on this topic and academic stress helped to make me forget the beauty of this topic. Your passion, sir, gave me a fresh breath and remainded me this is AWESOME. Thank you for your video and keep on being a passionate concrete freak!
Thats how you do a presentation; enthusiasm, clarity and no boring monotones. This Guy is so engaging, Thank You.
I've had a garage floor that needed to make up a 1/2" gain in height- we mixed in fiber (fiberglass strand type) and trowed to a smooth finish. While not directly exposed to the elements, it has had cars, trucks, etc. worked on with jack stands, etc for over 10 years. still holding up well, in the freeze/thaw climate.
Rick,
Thanks so much for sharing this success story! Do you know how much fiber you used?
Tyler, that will be a hard one, but I will try to check. it wasn't that much, because it was actually mixed by hand. I will try to find the left over packets of fiber, but I think it was roughly one ounce to 50lb dry, course sand, no klinker. I love your channel!
I only wanted to see what a fiber cement looks like but I ended up watching the entire video lol. This is so informative and the way it is presented really made me interested. Thanks for this!
It was my grandfather who designed this with his friend and patented it. True story however I think it’s been changed over the years because it was done with stainless steel pins when they made it
Thanks Tyler for your quality videos. I am a retired contractor now full time artissn / craftsman in deep play with cementious materials. I just recently did your channel and would like to express grattitude for your enthusiasm and willingness to share. Thanks
Now, if I can just get my Home Builder, to get this excited about fiber.
I really learned a lot from your videos.
Hey Tyler, here is AU I came across fiberglass woven mat where the woven strands are every 2mm and is a 6 oz mat. I've used these in garden bed walls that can be walked on with heavy wheel barrows. 20 years on and not a crack. Basically I lay 30-40 cm of concrete then the first mat, another 40cm concrete and second mat and keep going to the relevant height required.
Concrete tunnel liner segments use polyethylene fiber for fire protection. It does not hold the concrete together but rather melts allowing space for the concrete to expand without as much damage.
We casted around 12 column using fiber reinforced concrete in both pcc and rcc. The fibers were actully prety coool. The cracks were minimised and ductility improved . We used 3d hookedend fibers.
Hey great info. What would you do for a Barndominium concrete slab where half the building will be habitable and concrete will be polished with underfloor heating and the other half will be garage/workshop.
Thanks to your videos some concepts concerning concrete just become easier to understand :)
Would be nice to know the advantages of using one fiber over another. Acrylic, pva, fiberglass, carbon, basalt.
Ryszard,
This is a good question. In my opinion there is not a lot of good data on this. Most testing has focused on the strength of the fiber reinforced concrete after it has cracked. I am not sure this is really what is important. I think it is better to focus on how well the fibers can keep the cracks small. Also, most of the testing is from external loading. Very little work has been done to investigate the performance in cracking from freeze thaw or drying shrinkage. While is known that the micro fibers only really help at early ages, no one has really quantified how much they help.
We are starting to work a lot with fibers in my lab and so stay tuned for more details.
@@TylerLey - I have a question concerning "Tarantula" - have You ever used it in the context of Recycled Agg Concrete?
@@avid0g Barchip Inc has the best plastic barchip reinforcement on the market, they seem to be the standard.
@@Veldtian1 All the companies listed on the Fiber Reinforced Concrete Association (fiberreinforcedconcrete.org/) are great suppliers of quality plastic fibers. Check out the site!
I know basalt does not rust, expand, or corrode like steel, is ultimately stronger yet extremely brittle, failing abruptly. Specifically, basalt is less rigid (1/3) than steel rebar in the steel's elastic sense, but has a much higher ultimate strength. But when it does fails it does so abruptly and totally. There is little warning, so safe evacuation of structures is dependant on active monitoring of abnormal stress, which requires planning and fidelity.
Basalt fabric has properties that have not been properly exploited by industry. It can be placed at the surface of concrete so that it's tensile strength minimizes initial cracking. However _prestressing basalt_ fabric has not been investigated enough.
Your way of teaching is amazing.. Really love it..
This was helpful. I want to pour concrete in a thin, half-inch mold, but Ai didn't know whether this would help. I guess it won't prevent it from cracking, but it might help it from splitting? I'll still try it out and see how much it helps.
After learning all about concrete over the past few years from watching and rewatching your videos (among others) I'm now standing here in Costco having an aneurysm that they didn't fiber reinforce their beautiful densified concrete floor! So many cracks!!!!
I need to patch several pot holes in a parking lot. The traffic is light but there is forklift, 4000Lb, and tractor trailer deliveries. Would fiber reinforce concrete say 4-6 inches in the bottom of the pothole with asphalt patch on top work? This is in a desert environ, southern Utah, very little rain and hotter than hell in the summer.
Hi, Mr. Ley. I have not used fibers in my projects, but for my civil engineering materials end of semester presentation, I may summarize some of the current research of fiber reinforced concrete. Your video has inspired me and helped me to select my topic.
Dude, this is the best into of any video on TH-cam! You got style. U get right i to the subject.
Dear Professor Ley, thanks a lot for your video. Now that you talk about fibers we are making concrete, we are making concretes with Waste to Energy Ash, we use ash instead of sand and aggregates, this is big because all the ash is pozzolan. Concretes made with this type of waste are Photocatalytic meaning help breakdown air pollution and are impermeable and self-healing and yes, they have micro-reinforcement.
Careful with ash, especially fly ash from coal burning electric plants. Home Depot learned that the hard way years ago near Richmond VA when their contractor used 30% fly ash in the foundation and floor slab for a new HD store. If memory serves, some of the metal shelving posts broke through the new floor when they stocked them. The entire building was condemned and razed so they could start over.
Im going to use both Owens Corning 32-500 fibers and a fiberglass rebar grid in my wood stove hearth. Im hoping it will increase the strength and minimize cracks.
Dr Ley, I have been getting push back from Contractors especially on slab on grade application. There argument is it is challenging to finish, like you showed on your video. I like the video it is truly helpful.
Try adjusting the paste volume of your mix with fibers. Make a designated mix design with fiber built in. I find a 30-35% paste volume works well with typical macrofiber
@lackoffkgivity most of these issues can be fixed with paste volume and using clean aggregate
Also don’t throw all the fibers in at once. Do one bag at a time slowly
Hi, I just had a 5" fiber reinforced concrete slab poured for my future garage. Do I need to wait a MONTH to stain and seal it? Thanks so much for any information!!!
Can you share your insights on hempcrete and bamboo?
I specified fiber reinforced concrete once. It was a pad for a portable MRI at a hospital. It was moved from place tp place in a semitrailer. I wanted to keep iron or steel away from near it because that would affect the image and the machine would have to be “shimmed” or adjusted each time it was parked before it was used.
I am planning to make a small drainage. 50 ft in length, 6 inches wide, 2 inches side wall, and 1 inch thick. Do i need these fibers or should i just use 1"x1" wire mesh?
Thanks for this video it has helped me advise my customer accurately
Great!!!
Is there fibers like piano wires that you can place like rebar then mix the other fibers into the concrete?
Thanks for the helpful videos. For building sculptures, I was hoping I could shred my own recycle plastics to use as macrofibers. Any reason not to do that?
What about using magnetic fields or static charges to align the fibers as the concrete solidifies?
And how exactly do you ensure even distribution of the fibers in the mix?
Can we use old cloths and torn them into pieces and use them as fiber to make fiber cement?
Great video as usual! informative, brief and super interesting! Thanks Prof. Ley for sharing your knowledge and passion!!
I'm addicted to Tyler! He's so awesome!! I wanna be a concrete freak too :)
Should we use fibre by volume or by weight while casting cylinders for research
Great channel. Thanks Prof
How can we get hold of you if we have any questions.
Do you put a thin layer of concrete without fibers, for example, in a mold, then add more with fibers? Otherwise, the fibers may be seen on the surface.
Hi, can we used bumboo in building ringfourcment?
How it possible to make a building beam, colam and slab.
What would be best for a wood oven structure to take heat and fire?
Hello Tyler Ley
@2:20 you said fibers do not stop the cracks from forming.
How I think of it is, macro-fibers do not stop the macro-cracks from forming and micro-fibers do not stop the micro-cracks from forming. But macro-fibers added with micro-fibers can help a lot. Micro-fibers will help the micro-cracks to not propagate into macro-cracks.
This is just my opinion. What do you think about this? Would love to hear from you. Thanks.
Hey Tyler! I have a question regardinf how to reinforce concrete object. Let's say I'll make weight plate with 45cm diameter and 5cm thickness with hole in the center. What if I add steel chicken wire surounding the plate plus Chopped Stranded Mat fiberglass on the mixing. Will they make a better strength or just use either one instead? Thanks in advance.
Wow, you are genius, the way you explain something becomes super easy to understand.
How do glass fibre concretes stand up against extreme conditions such as earthquakes when compared to regular concrete?
What type of fibers should I use when making concrete Atlas Stones for strongman challenges/competitions? These range in size from 10" to 24" in diameter. Was looking at Basalt and Polypropylene - either of these better than the other for an application like this? And what length of fiber - seeing 19mm, 36mm and 50mm as options from Amazon suppliers. Thanks!
Have you considered for steel fibers using magnetic flux field to align the fiber direction. Example is iron particles on paper that have a magnetic field extending through the paper shows the alignment. So assume that you can lay the concrete into a form in the direction that you want the fiber majority to be aligned to. One way of aligning them is a use a tube with DC current flowing through wire wrapped around the tube. The flux field will be parallel to the axis of the tube and flow direction.
I would think the density of concrete would require a very strong magnetic field and that would draw the fibers to that side of the pour. Remember your example is in a very nonresistive medium(air) and the filings are being kept separated from the magnetic source by the (relatively) strong paper.
Thanks Thomas! William is right, it is very hard to get the fibers to align where you want them to. Also you need a very strong magnet. However, maybe somebody can figure this out. Someone should try and make it happen.
Maybe magnetic alignment could work whilst the concrete is being vibrated, because everything would be more mobile. Interesting idea. Test it yourself and make a video :)
@@jasonvoss1984
Or the magnetic field can be pulsed, this could even do the vibrators job.
Metal in concrete is a bad idea especially in humid climates. Metal will expand and contract causing cracks. That and metal rusts like a bitch in concrete because of water.
If you mix these helix fiber along with Rebar.. will it be much more stronger? than just rebar pour
A long long time ago, I saw a "futuristic wall" on a tv show, and it was just concrete with a lot of glass fibers in it, and in the day time, the wall would actually sorta glow as it let some light through it.
is it possible to use something more natural than the fibers you show here, like hemp fiber, in concrete?
Tyler, it's been too long, glad to see this post AND it's on a question I ask you about quite awhile ago. Awesome video, worth the wait! Thanks for continuing to teach us about concrete. Never would have guessed how complex and interesting a subject, concrete is. Can't wait for more!
Thanks for being patient William! I am glad you are enjoying the videos. Basalt/FRP rebar coming pretty soon.
Dear prof. Ley, My name is Jang. I'm college student in Korea, University of Seoul. I'M REALLY DOPPED in your channel about conc. Now, i'm in major of UHPC(Ultra high performance concrete) and its piezoresistivity. If you don't mind, would you upload a clip about UHPC on TH-cam? Thank you for reading my direct message :)
Do you have any suggestions for concrete roofs
7-VII-2021.We artist have been using fibers in our clay plaster and concreat sence the the Renaissance, today we have green strenth and fired strenth fibers, in Malta my Greath Grand father pionerded the usage of fibers in concrete back in 1906. Much more to tell you about.
Love the video!!! Thanks for getting the word out on fibers! And FORTA is always willing to help with tips on finishing . We have seen many amazing finished floors over the years... that still look great!
Thanks so much for the comments. Also, thanks for providing fibers for my students to use in my lab. It would be cool to learn more about finishing with fibers.
@@TylerLey We have some finishing videos, but nothing as cool as yours! And many are out dated. We need to step it up...
What do you think about hollow block with concrete for big project flooring verses concrete a
Reminds me of horsehair plaster! Is there a method of aligning the fibers to control the way they will support stress? Perhaps running some sort of comb through the wet concrete in a single direction?
thank you dr ley . repeat and repeat and repeat . i must watch this 1000 times.
Thank you for the awesome picture.
Hello, Tyler. I have a question if you don't mind. I wondered why almost never was asbestos fibers used in concrete even when it was legal? Thank you
Read about James Hardie and CSR here in Australia, Asbestos fibre was used extensivelly here in fibre reinforced cement, basiclly every house was built using it at the time
Thought: if you poured a few inches of concrete, and then placed a sheet of fiberglass in the area of the most stress, and then repeated, concrete and glass sheets? This would be instead of random fibers, and would be in addition to rebar.
Would it be smart to add a top coat of some sort of using fiber-reinforced concrete for residential floors (without any tile or other additional surface materials)?
Thanks a lot Tyler. Love the way how you make complex topics simple.
I had one question though. What if we use Glass fibre mesh instead of the fibres? Will it solve the alignment problem?
In the info given for the amount of macrofibers to use, for steel, (I guess like wires? chickenwire for my sculptures?) it is told as "2x" or explained as "about twice as high" to quote the video. I don't get this. 2x what? what does this mean?
hey Tyler. I'm a concrete finisher and so glad i found your channel. question:. why would my concrete driveway crack right next to a control joint months after we poured it. thanks.
Can we use post tension cable+rebar+fiber reinforcement?
Thanks! I have a client who wants to use CFRC cladding on a building with purposeful placed holes in the concrete. How will this affect the concrete?
Just had a contractor extend my back patio. I wasn’t aware of this “microfiber” method. When they were done and I lifted up the tarp it looked like a bunch of grass was embedded in it turns out this stuff is the microfiber. The contractor told me that they will eventually go away is this true? It looks pretty bad at the moment
A lot of engineers don't like specifying fibers since there is no code requirement and they don't want to increase construction expenses. You need an economic argument for the client to accept the specification. What are the economic advantages to fiber reinforces concrete?
What is the relationship between fiber reinforcing and corrosion? Can fiber reinforcement help reduce corrosion in parkades where there is freeze-thaw and lots of salt?
Thanks Andrew,
I agree that more work needs to be done on this to get the data that you want.
Right now the fiber companies are relying on engineers that want to create concrete with less cracks. It is like all the extras on an ice cream sundae beyond the ice cream. You don't need them but they sure make it better.
I guess the question is whether cracking is important to your structure. If it is then you should consider adding fibers.
Lower rebar placement labor is why I'm starting to use it in residential foundations and walls. Going from a #5 12" mesh to 20lb a yard steel fiber if i remember right
helpful,
where do i buy concrete fiber?
Wanna pick your brain on this subject.
so what if rebar corrodes? I read somewhere that only the exterior surface corrodes but the rebar core remains strong. The surface corroded layer also prevents the core from getting corroded.
So is rebar corrosion really cause of concern for structural failure?
Thanks in advance and hope to hear your thoughts on this!
Hi! Are you familiar with PrimX SFR concrete solutions?
We like to use micro fiber on our slabs regardless we have rebar or WWM -- have not tried @ a column and beam levels before... will look to try on our next pour
I first saw and heard and about fibers in 1993. My understanding was that it was a replacement for concrete wire (the 6"x6" grid wire about 5' wide that comes rolled up and a pain in the ass to handle; yeah that concrete wire).?. Which is used to resist shrinkage and freeze/thawing cracks, not necessarily loads. That's what the rebar is for..? what do you say about that?
Can you still seal micro fiber concrete. I recently had a patio poured and it has microfibers. I can see them. It is also dusting due to poor prep by my contractor. This is why I want to seal it. I greatly appreciate any response and knowledge.
We've been having good luck using large weave fiber sheets lain at 1" depths during the pour
Is it a good idea to have fiber-reinforced concrete on a post-tension court? Or not necessary at all?
Can you make any cost comparison of using various fibers and rebars?
I have an outdoor pathway, I'm using 6 sack concrete mixing myself. I would like to have these pathways about 1 inch thick. From your video's I think both wire mesh and microfibers would work best? Steps I will use: integrate microfibers in the wet concrete, pour a 1/2 inch put the wire mesh down, then pour the top coat? Is that the best method?
super light concrete could potentially benefit from fibers: organic, natural, metalic , wich will last longer? concrete absorbs humidity and stores it?
I live near the beach where much of soil is sandy. Also, it is wet. I leve near wetlands, maybe 50 feet from where I wanrt to put a concrete pad for a carport/garage. ANt recommendations, tips on things a rookie like me needs to look out for in terms of fiber, or rebar. Any tips at all?
Is it a good solution for cracked concrete bases..........ie addding to a mortar mix and then place in the cracks?
We are pouring a 1 to 6 inch topping slab on a WWT plant containment SOG. 130 foot x 100 foot. 4 foot high containment wall all around. All concrete has rebar, topping slab has microfiber reinforcement. Trench drain along centerlines.
About 2200 cubic yards for the slab, equipment pads and steel support pads
Is possible avoid the cracking itself?
How can you properly mix such a small fibers inside a big mixer truck?
clearly explained, thanks. I am trying to decide if i should use steel mesh or fibers in my 10 inch tubes for the footers under my shed. I am in savannah, so there is no frost line, and my footers are not very deep.
Thanks so much for this video Tyler! I've been waiting for something like this and just happened to catch it within minutes of going up.
Glad you liked it!!!
If a home was next to trees does it affect the reinforcement of the concrete
can you make a video explaining the amount of rebar spacing in a balcony ?
I need to make some concrete plate weights for workout lifting purposes 🏋🏼. Some sold molds come with a metal loop & what appears to be plastic fibers. I’ve seen dudes use rebar. I heard of some kind of a metal mesh being used. I imagine it was 2 pieces cut to weight size, 1 placed after the initial surface layer of concrete is applied, & a second piece applied more towards the top beneath the top finishing layer of concrete. I imagine I’ll spray finish them with rubberized flex spray. I also imagine I’ll replace the pvc inserts with steel. Any suggestions if plastic or metal fibers would work better? Should I use rebar or mesh as well? I’ll definitely have to buy a scale due to additions altering dimensions of weight density distributions.
Thanks for the info 👍🏻
Pardon my naivete, but if you use macro fiber, could you use nylon rope instead of steel rebar?
(Re: I'm looking for a way to build a single person one-floor-at-a-time DIY 10-story residential where the logistics are single person easy - no rebar, no pre-tensioning, just rope and fibers delivered in rolls and bags, respectively. ???)
Here comes graphene.
th-cam.com/video/n82_NsFjj_8/w-d-xo.html
Can you elaborate on being careful when you finish? Is it just making sure the fibers dont stick out?
Hello sir
I am pursuing Masters of engineering ,and my dissertation topic is GFRP as rebar in concrete, and I choose to cast one way slab using GFRP rebar. But don't clear the design philosophy, I read the ACI 440 code but never clear from it .
So please share something on it
Thanking you
Here's the question though... why do they use loose, mixed-in macro fibers instead of woven cloth with pre-tension? we already do pretension with rebar on foundations and bridges etc. I imagine if they did that with the fiber, ie putting some fiber tow into the concrete and applying tension during curing... wouldn't that be a simple step to ad a whole lot more toughness?
Can ( should ) fibers be used in airated concrete ( Aircrete ) ?
Or would the fibers ‘ mess with ‘ the tiny bubbles ?
Micro fibers= cracks 1-6 hours
Macro fibers= cracks days to years
I used to be a driver now I'm a batch man so I'm watching all your videos on concrete so I can sound smarter 😁
What if you added a sheath of reinforcing material around the concrete, like covering it in carbon fiber composite, creating a honeycomb. The composite would take the normal forces and the concrete could be the web and take the shear forces. Aerospace engineer here, so I don't know diddly squat about concrete, just wondering.
Which is better for stucco nylon fibers , poly polypropylene for fiber glass fibers ? or are they all just about as good and easy to mix uniformly
Could fiber cemented wall insulated da home🤔🤔🤔 ie first floor home
Thanks for all your videos, I am planning a workshop build and every concrete contractor has a different idea of what would be best. Educating myself with your videos are helpful through this process.
Do you have any videos or insight on how in Slab radiant heat with under slab insulation effects concrete?
Thanks again.
Thanks Dennis,
I don't but that is a good idea for the future.
Great video, very helpful. Thanks for posting.
Thanks fir explaining about fibers. I make concrete flower pots, flowers, and crafts, etc. I put a lot of work and details in them and would like to make them stronger. Please yell me which is best to use. Many thanks!😊