10 worst mistakes about Fiber Mesh micro-synthetic fibers

Author: FibereGo 2022-04-01 11:32
Fiber Mesh concrete never cracks? We can replace fiber mesh with rebar, can we ? Here is the answer you are looking for.
10 worst mistakes about Fiber Mesh micro-synthetic fibers

1. Fiber Mesh concrete never cracks?

Wrong.

Internal stress fractures are minimized using Fiber mesh micro-synthetic fibers.

Due to settlement, shrinkage, limitation, and, in some cases, vibration, these internal forces that arise in the first 24 hours of curing can cause cracking. The cracks in the concrete do not resolve when the concrete hardens. But it can not stop the structural cracking.

The prevention of shrinkage and cracking is the main benefit of fiber-reinforced concrete. Impact resistance, increased tensile strength, and reduced voids may all be achieved with the correct fiber-reinforced concrete.

Here is the two basic points.

1.1. Fiber mesh micro-synthetic fibers inhibit cracks caused by internal stresses.

Throughout its service life, a concrete building may be subjected to a range of environmental conditions.

The capacity of a concrete structure to resist certain exposure circumstances without requiring extensive repair or rehabilitation is thus characterized as its durability.
Water is absorbed in the reaction process after the concrete begins to solidify (through cement hydration), while the concrete remains outwardly dry.

Drying shrinkage is the primary cause of the wider, unsightly, usually full-depth cracks known as dry shrinkage cracks, which result from the total loss of water in the concrete.

These internal forces that develop in the first 24 hours of curing can result in cracking due to the settlement, shrinkage, restraint and, in some cases, vibration.

In a spinning mixer, the cement was added to the water and dissolved for around 30 seconds. After that, the sand was added and stirred for approximately 30 seconds. Water was used to soften the fibers, which were then distributed by hand in the mixture to produce a consistent distribution throughout the mortar, which took 4 minutes to mix.

Before the first 6 hours, the majority of the fractures emerge on the mortar’s surface, and then disappear before the first 24 hours.

As a result, the number of cracks on the surface of a 24-hour-old recent example specimen is counted, the size of all cracks is measured using a microscope, and the mean crack width is determined.

1.2. These cracks do not disappear when the concrete hardens.

One of the most damaging characteristics of hardened cement composites is the loss of moisture, which affects a long-term strength and durability. This change is significant because it results in visible cracks in cement composites.

Fiber mesh is used to improve the structural integrity of concrete by reducing water leakage. This sort of concrete is also utilized to improve impact resistance, prevent freezing, and strengthen it.

2. Fiber mesh can do nothing about plastic shrinkage crack formation?

Fibermesh micro-synthetic fibers are used to increase the tensile strength of new concrete.

When used in the proper quantities, the fibers are meant to decrease the most typical kinds of plastic cracking and their damaging effects on the long-term durability of hardened concrete. It serve as an internal support structure, keeping the concrete mix more smooth.

3. Fiber mesh fibers can not affect concrete seeping?

Yes, when Fibermesh fibers are applied at the following the correct rate, bleeding is more equal. The isotropic contributions given by the fibers’ support value restrict the speed and scope of water migration from the core to the surface.

Rather than rushing up to the concrete surface and producing ponds, bleed water rises uniformly in Fibermesh concrete and appears as a wet sheen on the surface. The entire fracture void structure is reduced when fibermesh fiber reinforcement is used.

By converting the concrete from a brittle to a more ductile substance, it becomes more stress absorbent.

4. Fiber mesh stops the cracks from forming?

wrong.

It only keep the cracks small. They do not stop it.

Temperature changes can lead to cracking. It can also be caused by variations in density as a result of the concrete getting hardened. Cracks do not occur when fiber mesh is used. The fiber mesh, on the other hand, will hold the concrete together and keep it from cracking.

5. Concrete  slump has nothing to do with the length and diameter of the fiber mesh?

Maybe.

This reduction in slump does not always mean a reduction in workability, especially when vibration is used during installation.

By bridging the cracks that form, Fibermesh fibers help to prevent any crack formation. The fibers also improve the connection between the concrete and the reinforcing bars by preventing concrete cracking in the area of bar deformation under bearing pressures.

6. The dosage for fiber mesh: the more, the better?

It depends.

The compressive strength of concrete will not be affected by using an evenly dispersed, correctly constructed Fiber mesh fiber at the recommended dose rate.

  • Sometimes  When the dosage exceeds a specific limit, the concrete loses its toughness and becomes fragile.
  • 1kg/cu yd (0.9 to 1.5 kg/m3) of concrete. Dosages outside the recommended dosage can be used to meet the specific requirements of the project

7. Fiber mesh is always better than rebar?

The concrete is reinforced with synthetic fiber mesh, which prevents cracking. Steel rebar, on the other hand, is required for applications requiring great tensile strength. As a result, you should be safe without rebar in pedestrian zones, so you’ll be pushing it in driveways.

Steel fibers and rebar have various functions and produce different objectives. Steel fibers and rebar are both needed at times, and only under a few circumstances can one effectively replace the other. Steel fibers prevent cracks while rebar controls crack width.

● Sometimes you need steel fibers, and sometimes you need rebar, and only in a few limited situations can one effectively replace the other.

To put it simply, steel fibers prevent cracks, while rebar limits the width of cracks.

Synthetic fibers are now as strong as – and even in some cases, even stronger than – their metal counterparts. Synthetic fibers are generally preferred over metallic fibers because they are less expensive to produce and are corrosion resistant.

● cons of fiber mesh

To make a better selection, you must first understand the disadvantages of Fiber Mesh Concrete:

Possibility of Injury
The glass and steel strands used in fiber mesh concrete are both extremely sharp, working with it carries a risk of injury, particularly serious wounds.

Corrosion of Steel Fibers
When steel fibers are used in concrete, the steel will corrode over time. It will have an impact on the concrete’s long-term durability.

Make a Rough Surface
Fiber concrete makes it difficult to achieve a smooth finish. Some fiber materials will show up on the slab’s surface, resulting in a rough or hairy appearance.

Not recommended for use in load applications
In terms of being able to take weight as well as movement, such as that caused by earthquakes, fiber mesh isn’t the same as rebar.

● Rain might expose the fibers

The most common cause of concrete degradation is rusting of reinforcing steel and other embedded metals. When steel rusts, the resultant rust requires more space than the steel itself. It’s possible that the water repellent element would have a stronger effect over a longer duration of time. Steel fiber rust is made more likely by exposure to chlorides or carbonation.

● Fibers randomly orient in the concrete and could result in poor quality concrete, if not uniform

To produce the appropriate strength while keeping workability, the correct balance must be maintained. Depending on the fiber type and dose, the new concrete unit weight varies considerably.

● Reinforced concrete is about 10% to 15% costlier than non-reinforced concrete.

The exact amount of fiber to utilize is affected by different factors, including input, design, and concrete. When comparing structural steel to reinforced concrete, structural steel has superior strength, fire resistance, and recyclability. Reinforced concrete, on the other hand, is made using much less costly materials.

8. We can replace fiber mesh with rebar, can we?

Steel fiber and other structural fibers are supposed to replace rebar. It is a cost-effective and labor-saving concrete reinforcing alternative.

Fiber mesh, unlike rebar, which must be precisely positioned before concrete can be poured, pours with the concrete, saving both time and effort.

● Fiber Mesh Concrete is not intended as a substitute for rebar.

The two can be used jointly for extra reinforcement, but never use fiber mesh as a substitute. The mesh isn’t strong enough to withstand the weight and force that rebar can.

9. Fiber mesh is always a better option to wire mesh, is it?

time and energy

Fiber mesh save more time and energy in terms of construction.

Regarding of time fiber mesh is easier to apply with concrete than wire mesh.

Energy –  in terms of man power, it’s much easier to finish and less hassle to install.

cost

Fiber mesh is cheaper and saves money because fiber mesh can help you reduce cracks and it will take longer to damage.

Potential injury of steel fiber

The majority of the fiber mix’s components are made up of materials with sharp edges. Because some of the materials make it to the surface, anyone who steps on it may be injured.

uneven distribution

You never know how the fibers will be distributed when you mix it together, thus some portions of the concrete will have significantly more fibers than others, causing some parts of the concrete to have more or less strength.

cannot hold structural crack

Concrete cracks are very common, yet they are frequently mistaken. When an owner notices a crack in his slab or wall, he immediately suspects something is incorrect, especially if the concrete is fresh. Mixing the concrete too wet is one issue that contributes considerably to shrinkage. When too much water is added to the mix, the concrete shrink more than when the proper amount of mix water is applied. This is due to the added water taking up more space in the mix, forcing the solid components further apart.

10.There is only one type of fiber mesh

Fiber mesh is used to prevent water loss from concrete while also improving its structural integrity. Fibrous materials such as synthetic fibers, glass fibers, natural fibers, and steel fibers are used to make fiber mesh. It’s most commonly seen on sidewalks, patios, and driveways. This kind of mesh is distributed equally throughout the wet concrete rather than being placed before to the pour.

Fibers types include the following:

Polypropylene

Polypropylene fibre (PPF) is a straight polymer synthetic fibre made by polymerizing propylene. The ability of a long-lasting structure to withstand weathering, chemical damage, abrasion, and other degrading processes while requiring low maintenance is just as essential as its ability to withstand stresses.

Polyethylene

Polyethylene is a common material for outdoor furniture and geotextiles. It is a polymerized polyethylene unit-based produced fiber. Monofilament is the most common kind, however continuous filament yarns and staple fibers are also available.

Acrylic

Acrylic fibers are a popular type of man-made fiber created from polyacrylonitrile, which is formed by polymerizing acrylonitrile (vinyl cyanide). Dry or wet spinning extrusion methods are used to make acrylic fibers.

Steel

Steel fiber is a kind of metal that is used to strengthen structures. Steel fiber concrete flooring can reduce fractures in hardened concrete and give maximum resistance to severe loads, both dynamic and static.

Cellulose

Cellulose ethers are water-soluble polymers made from the most common natural polymer, cellulose. It is significant type of water-soluble polymers used in the construction and building industries.

Grass

Grass fibers are a type of monocotyledonous fiber in which the entire stem, including the leaves, is pulped and used to make paper.

Glass

Glass fiber is a material made composed of several little glass fibers. The material is one of the most adaptable industrial materials available today. It possesses mechanical qualities that are equivalent to carbon fiber and polymers.

Glass fibers are utilized as polymer reinforcement in a variety of industries, including aerospace, automotive, marine, athletic and leisure goods, as well as construction and civil engineering.

Carbon

Carbon fiber, also known as graphite fiber, is a strong, stiff, lightweight material that has the potential to replace steel in specialized, high-performance items such as airplanes, racecars, and sporting equipment.

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FibereGo

Hi,there,I have been engaged in the cellulose ether industry for 11 years.

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