This is a result of the assorted fiber materials used in its application. If you are pouring a structural slab, use use rebar. PeteDraganic | Posted in Construction Techniques on April 23, 2009 06:39am Looking to do a small pour to replace a driveway apron to a commercial establishment. As you can now see, you have a number of worthwhile options before you when it comes to reinforcing your new concrete slabs. All concrete shrinks. If the thickness of the slabs is less than 1 foot, then steel mesh may be the best choice for you as rebar is best used vertically. So why use is it that contractors will steer you towards substituting fiber mesh for WWF, because the contractor either is pulling the wool over the customers eyes or doesn’t know any better themselves. 8″ thick apron and associated sidewalk. Fiber Mesh. It contains short discrete fibers that are uniformly distributed and randomly oriented. Great article, i obviously like this site, keep on it. If it is lifted and suspended in the concrete, it then serves two purposes. If you make concrete with CFS 100-2 steel fibers at 70 pcy (pounds per cubic yard), you get, on average, 12 fibers in each cubic inch of concrete. However, its actual placement can be cumbersome (due to its weight) and time-consuming (due to the need to secure rods at joint points with ties or welds). From there, we’ll highlight some of their main differences and demonstrate which of them is best suited for your upcoming slab creation job. The inspectors here like to use wire mesh and fiber. :), Chicago's Concrete, Demolition, Excavation, Masonry, and Paving Experts. I have googled the subject of wire mesh vs rebar and found there to be very few legitimate resources on this subject. This is true in both vertical and horizontal applications, actually. As a tradeoff, though, this material is considered slightly weaker due to the smaller gauge of its rods. Wire mesh’s most noteworthy advantage is that it does not require supplemental welding or trying together. This guide will help you better understand all three by breaking them down to their basic elements. Wire mesh is less strong by comparison, not least because of the diminished size of each of its steel rods. Fiberglass rebar & mesh for concrete Fiberglass rebar is used throughout the world – in the US, Canada, Japan and European countries – since 1970th. These two attributes along with properly placed control joints will help give your new concrete a chance at long life. With rebar and synthetic fiber in the concrete (and while you’re at it, some polystyrene insulation too) you’ll give your business a fighting chance against both Mother Nature and Father Time. However, unlike the previous two types, this method does not require a framework of steel to be set into wet concrete. The base is sand, about 15' deep. Rebar, Wire Mesh or Fibers in A Concrete Slab? As such, it is often used for smaller walkways and patios. I learned many things from your post. My first response to home owners is “Turn and RUN from any contractor who tells you ALL you need is fiber mesh because it’s stronger than WWF”. That is another good question, and the answer depends on where the contractor places the WWF during the pour. Wire mesh is also fairly easy to place over a wide area with a smaller construction team. Unlike rebar which must be set precisely before concrete can be poured, Fibermesh pours with the concrete saving time, as well. please make more. So, if you are building a floor, wall, or any load-bearing structure, then rebar would be a solid reinforcing option. And may I say great writing skills! Keep posting stuff like this i really like it. For building projects involving concrete there are two key ways to undertake reinforcements to … It is typically used in sidewalks, patios, and driveways. As has long been the case, many contractors still turn to rebar given its durability and versatility. I'm planning to pour a concrete driveway. contractors belly ache, but the results are far superior. The two can be used jointly for extra reinforcement, but never use fiber mesh as a substitute. The fiber in fiber reinforced concrete adds some strength to the concrete by mechanically reinforcing the concrete. Fiber meshes are, in theory, the strongest option available to contractors today. For an ordinary house , 0.5 " diameter rebar is common ( mine also has some 0.625" and 0.375" ) . This is why we put in control joints (the lines in you see either tooled or cut into the concrete) to help dictate where the concrete will crack. The fibers are used to solve a very particular problem called shrinkage cracking. Each comes with its own benefits and drawbacks, both in professional and DIY settings. The fiber mesh’s job is to help hold the concrete together in that initial drying phase only, and when it cures, does little to NOTHING to add to the strength of the concrete. Instead of laying down a wire mesh before the concrete is poured, using fiber mesh involves mixing in different fibers such as glass, steel, synthetic fibers, or natural fibers. I'll be driving my truck, car and camper over it. If you are talking about a slab (floor, driveway or patio), there are three choices - fiber mesh concrete, concrete with rebar and concrete with wire mesh. When it comes to using rebar vs. wire mesh, the short answer is: use both! The answer, as you can imagine, depends on the specifics of your concrete pouring job. It sounds good, like a high tech answer to an age old problem, but it isn’t. Fiber Reinforced Concrete (Juni 2020). I am ... so here the 411.rebar and fiber/mesh … That is the case if you already own a method of connecting rebar rods and plan on buying rebar rods in bulk. FIBER MATRIX IN CURED CONCRETE. As a licensed concrete and brick mason in the City of Chicago, I’m often asked what the difference is between fiber mesh and WWF (welded wire fabric) when giving estimates. The fibers show up at the surface and can look a bit funky. However, some teams have started to favor wire meshes and fiber meshes instead. All concrete cracks. Greyzed Theme created by The Forge Web Creations. As it corrodes, steel rebar swells and increases the tensile load on the concrete, which begins to crack and spall, creating openings that lead to further and faster deterioration of the steel and concrete. The benefits of the macrosynthetic fibers are best measured using ASTM Test Methods identified as C1399, C1550, and C1609. So what is fiber mesh and what’s it for? Wire mesh prices can vary, but it can also be fairly affordable if you have space to store spools of the material. Remember, your car is going to be driving over this slab of concrete again and again, you want to give it all the help it can get. Keep up the good work. But if you’re new to this field, then you should know that rebar (an abbreviation of “reinforcing bar”) is a type of narrow steel bar that is often placed in a mesh arrangement to reinforce concrete. All that said, if you are planning on building your own patio, driveway, or garage floor, then you should give fiber mesh a hard look too. light weight mesh at the bottom of the slab is a total waste of time and money. Many contractors prefer to choose their materials based on cost. The mesh isn’t strong enough to withstand the weight and force that rebar can. The camper is a fifth wheel, about 10,000 lbs when loaded. Fiber is fine but doesn't do what you're hoping it does. Will be waiting for your future posts. Fiber mesh is actually a fairly modern method of reinforcing concrete. Be sure to keep these all in mind when it comes time for your team to choose rebar, wire mesh, or fiber mesh for your next concrete construction project. No microcrack can go more than a fraction of an inch without running into a fiber. I just happened to stumble uopn this post and boy am I glad I did. You don't have to goggle rebar vs… As such, it cannot be used in all load-bearing projects. Instead, this method involves the addition of synthetic fibers, glass fibers, natural fibers, and steel fibers during the concrete application process. Beton er imidlertid et meget skørt stof og har en lav trækstyrke eller modstand over for vandrette kræfter som ekspansion eller sammentrækning. The progressive countries in the last century realized how much benefit the use of fiberglass rebar can bring. That’s left some contractors wondering – which of these options is the best overall? Beton har en høj kompressionsstyrke, der betyder, at den kan modstå vertikale kræfter. If the WWF is lying on the ground and is never lifted into the pour, it then is not very effective. Concrete is brittle like a cracker. These rods are often made from carbon steel and cut to size, with an entire rod running the length of a particular slab. ReBar prevents it from shearing. All things considered, rebar is still the most appropriate option for the majority of industrial-scale concrete projects. The concrete is shrinking away from each individual cut and in on itself. Also, its uses in vertical slabs have not yet been well-studied. However, the consensus of opinion seems to be that wire mesh sheets, not rolls, should be used where slab thickness is between four and six inches and rebar should be used in slabs with thicknesses of eight inches or more. Depending on how thick you want the reinforced concrete slabs to be will determine which product is best suited for reinforcing. First, when it does crack and it WILL CRACK (any contractor who says the other is someone to stay clear of) the WWF helps keep the two now separated cracks from spreading apart from one another. Overall, according to Propex Concrete Solutions (which manufactures Fibermesh), Fibermesh can be used in residential, commercial or industrial applications as the primary form of reinforcement without a rebar skeleton. In any case, this method does not require any cutting, making it slightly less effort-intensive. Fibers include steel fibers, glass fibers, synthetic fibers and natural fibers – each of which lend varying properties to the concrete. Fiber mesh Vs. W.W.F. So what does the WWF do? Pouring ... FWIW, you may not want to use fibers if the concrete is going to be your finished surface. Continue reading below Our Video of the Day. Steel rebar has susceptibility to corrosion or oxidation when exposed to salts, aggressive chemicals, and moisture. However, much of the impact resistance this option imparts only works over a limited area. Then, as the concrete dries, it creates an internal mesh throughout the slab. I would like some input on what some of you like to use in your concrete. In some cases, the use of a high-range water-reducing admixture (HRWRA) may be needed to improve workability. This method remains the concrete reinforcing standard around the world, meaning that it is often reasonably cost-effective. Both C1399 and C1609 utilize a concrete beam to measure the engineering properties of the macrosynthetic fiber reinforced concrete post-first crack. Please feel free leave any comments or use the Contact Us tab and ask any other questions that you may have. The fiber mesh strengthens the concrete and the steel rebar reinforces the extra load areas. The problem is that concrete does not shrink evenly as a whole, think of it more like a pie cut into four or more pieces. (Welded Wire Fabric) As a licensed concrete and brick mason in the City of Chicago, I’m often asked what the difference is between fiber mesh and … Getting back to the initial question of whether fiber can replace mesh, we typically say yes–with exceptions. The great debate on whether to use rebar or number 10, 6 x 6 wire mesh in a concrete slab may go on forever. always use #4 minimum. The older one is 1.5 years with the fiber mesh, and so far it seems to be a good product. 11 Best Right-Angle Drills to Get in 2021, How to Refinish Hardwood Floors Without Sanding. Welded Wire Mesh vs Rebar. Concrete wire mesh is designed to take much of the hassle out of reinforcing concrete. Fiber mesh can be the fastest option in the pack, depending on what materials are added to your concrete during the curing process. When you try to break fiber-reinforced concrete, the fibers tend to make it so it doesn’t just fall apart in big chunks. Fiber mesh can be the fastest option in the pack, depending on what materials are added to your concrete during the curing process. The cracker will shear at the edges of your finger. Concrete fiber vs mesh. The use of fiber generally will decrease the same sample by 2 inches. Appreciation for the great blog post. If that’s you, then you’ll be able to make use of rebar in a fairly cost-effective manner. As you can imagine, each of these options differs when it comes to its overall durability. Since this will be a public road, I was wondering if any one has any input on the fiber vs. mesh as to which is the better product. Wonderful post and definitly worthy of my thank you comment. Wire mesh and rebar are roughly the same strength ; 55,000 psi yield ( both are available in various grades ). I wish I lived in Chicago because the last person who gave me an esimated tried to sell me on fiber mesh. At those scales, this option’s price can be managed well while still allowing you access to its enhanced level of tensile strength. The rebar is placed where loads are heavy like at the drive curb near the street where heavy trucks might turn into your drive. the need to secure rods at joint points with ties. Mesh keeps the chunks from separating when cracks happen. August 3, 2018 January 26, 2019 Brian Carson 1 Comment concrete patio, concrete tips, contractor, diy, flatwork, how to, patio, rebar, wire mesh When it comes to reinforcement there may be some confusion out there on what direction to go, rebar, wire mesh, or nothing at all. Wire mesh is on the faster side given that it simply needs to be rolled out, aligned, and cut to fit. Wire mesh is on the faster side given that it simply needs to be rolled out, aligned, and cut to fit. Thank you for your artical. What Is a Right-Angle Drill and When Is It Used? In my experience, it is useless. Although there are some similarities in the tests there are major differences. This method is notably more expensive and requires some expertise to perform properly. In the first few days of freshly poured slab life, the water in the initial mixing is evaporating from the concrete and it’s actually shrinking ever so slightly. Some contractors combine various methods, such as wire mesh and fiber reinforcement, to help reduce the chances of both structural and hairline cracking. Being a fifth wheel, some of the load is transferred to the truck. Now that you know the basics, let’s take a look at the major differences among the three. Adding fibers to reinforce a ready-mix concrete solution, sometimes called “fiber mesh,” is a relatively new development in concrete pouring. I just had a contractor working on another subdivision, one where the road will be PUBLIC, ask to use the fiber mesh. I love this blog. (Welded Wire Fabric). This, too, is one of the reasons it is only used on fairly small concrete placement jobs. This mesh is then rolled up into massive rolls, allowing it to be unrolled and cut to size right on a job site. I am glad I have taken the time to learn this. But as they serve the same purpose, it is difficult to understand their differences.Both are steel materials but they differ in structures and types. You know rebar, and chances are, you’re accustomed to using it on a construction site. So given Full Metal Fabrication's experience in both rebar fabrication and concrete contracting, I feel we could put our 2 cents in on the topic. Second, the rebar is going to hold the concrete together against force from up above and the fibers will help prevent the surfaces from succumbing to forces from underneath. © 2010-2012 Chicagoland Concrete, Inc. All Rights Reserved. Great post. A heavy wire , 8 gage ( American Wire Gage) is 0.123" diameter . Is it acceptable to use the cement mix containing fiberglass fibers instead of wire mesh/rebar? Thank you. When it comes to setting and strengthening concrete slabs, today’s contractors have a variety of options designed to fit almost any application or setting. Fiber mesh is made up of fibrous materials like synthetic fibers, glass fibers, natural fibers, and steel fibers. If you are doing a concrete construction project, you have already heard the name of rebar and wire mesh. mikeysp | Posted in General Questions on June 24, 2020 12:42pm I am in zone 4a. Rather than being laid down prior to the concrete pour, this type of mesh is distributed evenly throughout the wet concrete. Specifically, wire mesh is built from thin steel bars which are pre-welded together into a net-like pattern. Rebar vs Wire Mesh – What Is the Difference Reinforcing Concrete. I use #3 rebar on most all my 4" slab work on 2'to 3'o.c. also put the rebar in the other heavy load areas like down the driveway for extra support. When pouring concrete for a driveway, we highly recommend that you use both rebar and wire mesh for extra reinforcement. I now knew he didn’t know what he was talking about after doing some research online and reading this post. https://www.bekaert.com - Traditional concrete reinforcement is often believed to be cheaper than steel fiber concrete reinforcement. RE: Rebar vs. Wire Mesh cvg (Civil/Environmental) 13 Aug 15 17:40 don't do any residential work, however I never allow mesh except for shotcrete. Rebar has remained the gold standard due to its strength, for example. When it comes to placement times, these three support materials have some noticeable differences. Rebar is by far the slowest of the three, with its separate rods requiring time for alignment and connection (via ties or welding). ChicagolandConcrete.com______312.473.POUR, Fiber mesh Vs. W.W.F. ReforceTech, in Norway, has developed a novel version of CBF.Reinforced with basalt fibers, the company’s 0.5- to 10-millimeter-diameter BFRP MiniBars are composed of fibers wrapped with polymer resin in a helical shape and can span from 20 millimeters to 200 millimeters in length. Fiber-reinforced concrete (FRC) is concrete containing fibrous material which increases its structural integrity. Meanwhile, DIYers will find wire mesh to be a more useful option given its overall ease of application. However, it does impart a heightened level of impact resistance. The second thing WWF does is to keep two sections of concrete that are divided by a crack in the same plane (meaning that one won’t sink while the other sticks up). The reason that synthetic fibers have been successfully marketed as a substitute for wire mesh is that most nonstructural residential concrete slabs don't need much reinforcement. Barring unusual soil conditions, if a residential slab is being placed on a well-compacted subbase, wire mesh — or, for that matter, synthetic fibers — can be safely omitted. Fiber Mesh Concrete is not intended as a substitute for rebar. Steel rebar and wire mesh: Many countertop fabricators rely on traditional steel rebar (no larger than 3/16 inch in diameter) or galvanized wire mesh to reinforce concrete countertops. Over a very stable base that won't move, you can probably get away with wire mesh but I would still want ReBar. Rebar is notably versatile because it can be placed in almost any arrangement based on a job’s requirements. Fiber mesh is an additive of synthetic fibers usually added at the mixing plant. Fiber mesh does not really increase the strength of the concrete, but it can minimize shrinkage cracks. Fiber mesh is not a cheap option by any means. To start off, let’s look at rebar, wire mesh, and fiber mesh at a basic level. 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