Synthetic Fibers Concrete: 5 Minutes Best Learning
Melacoll 2022-07-11 10:18

Stronger and more durable than ever!

Synthetic Fiber is made and produced for specific purposes, it is usually formed through a chemical process that is made of synthetic materials.

To obtain the required strength and a solid foundation of a building, Synthetic Fiber is one of the materials that are being mixed.

The Synthetic Fibers as admixtures to concrete helps reduce plastic shrinkage cracking and increase surface durability.

In addition to this, Construction Companies should encourage to use of Synthetic Fiber reinforcement concrete for better quality and to ensure greater toughness construction.

1. Why use Synthetic Fibers?

In recent years, synthetic fibers have become more valuable as a reinforcing material for concrete that can solve corrosion problems at an affordable price. There is a wide range of fiber choices for reinforcing concretely available on the market today. Synthetic fiber reinforced concrete has been growing rapidly in the construction industry since contractors and homeowners began to realize its many benefits. It is attracting the growing interest of the concrete community to reduce construction time and labor costs. It has been used to improve the performance of concrete structures by improving the flexural strength, modulus of elasticity, and other mechanical properties of concrete. Some of its benefits are:

  • Controls and mitigates plastic shrinkage crackingsynthetic_fiber_concrete_impact
  • Reduce Segregation and bleed- water
  • Provides three-dimensional reinforcement against micro-cracking
  • Increases surface durability
  • Easily added to the concrete mixture
  • No Dampness and Leakage
  • Improved impact resistance of floors to point loads
  • Increased Production speeds
  • Increased site safety & efficiency

2. How does it work?

Concrete is intrinsically a brittle, compressible material, but it is significantly less effective under tension. Reinforcement is used to absorb these tensile forces so that crack, inevitable in all high-strength concrete, does not weaken the structure. The latest developments in concrete technology now include reinforcement in the form of fibers, especially polymeric fibers, synthetic fiber as well as steel or glass fibers.

When building with concrete, it is essential to have a clear understanding of reinforcement requirements, fittings requirements, desired and achievable strengths, historical data of materials used, proper placement of the material and periodically monitor the strength to ensure design specifications are met. The reason for this is that these fibers can hold some water and hence slow down the evaporation process. synthetic fibers can also detect certain limited tensile stresses, especially at a young age.

Synthetic fibers hold the aggregate and prevent the coarse aggregate from separating due to vibration/gravity, providing better bonding to the matrix. This ensures a homogeneous mixture of concrete and fibers, allowing water to pass slowly to the surface, reducing cracking in the concrete.

When a structural element is subjected to bending, the structural element has a very weak tensile force compared to compression, so reinforcement is required to withstand the tensile force.

3. What are the different Types of Synthetic Fibre?

Synthetic Fiber impacts on the behavior of plastic and hardened concrete vary based on the concrete materials, mix proportions, fiber type and length, and fiber quantity added.


The main synthetic fibers marketed in the United States are rayon, polypropylene, polyester, acrylic and nylon. Although the fibers of each come in different lengths, thicknesses, and shapes, synthetic fibers offer similar advantages when used as secondary reinforcement in concrete.

3.1 PP Fiber?

Polypropylene fiber reinforced concrete is also known as polypropylene or PP, it does not absorb water and does not affect concrete require mixing water. It is a synthetic fiber, processed from propylene, and used in a variety of applications. They are exceptionally hard, stable, and heat resistant. In addition, they are anti-static, non-magnetic, and non-conductive. The use of fibers is considered safe, environmentally friendly, and harmless.

different_types_of_synthetic_fibres_with_picturer (1)

The effect of polypropylene fibers on the physical and mechanical properties of concrete such as workability; modulus; compressive, flexural and tensile strength; stiffness; resistance to impact, chipping, freezing, thawing, abrasion; water absorption; porosity; permeability; sustainability and ecological and economic characteristics were discussed. Polypropylene Fiber is hydrophobic so it does not absorb water and does not affect concrete mixing water requirement.

3.2 Polyester Fiber

polyester is a synthetic fibre. Polyester fiber reinforced concrete (PFRC) has been evaluated for use as a cement concrete pavement material.

The use of polyester fibers increases the properties of concrete such as compressive strength, tensile strength, impact resistance and wear resistance. The fibers provide support to the concrete in all directions by being evenly distributed in the matrix. It also prevents the problem of corrosion.

Like polypropylene, polyester fiber is hydrophobic. However, they tend to decompose in the alkaline environment of cement concrete.

3.3 Nylon Fiber

Nylon is the first fully synthetic fibres and the strongest synthetic fibre. Like polyester yarn, nylon the threads are in the form of monofilaments. What mainly distinguishes them from polypropylene and polyester fibers are hydrophilic properties. Nylon is particularly effective in providing impact resistance and toughness in maintaining and increasing the load-carrying capacity of the concrete after the first crack. Nylon Fibers are manufactured with 100% pure synthetic fibre supplied as filaments for secondary concrete reinforcement.

4. Why Polypropylene added to concrete?

Polypropylene fibers are one of the most common fibers used in engineering. Polypropylene fibers have certain properties that make them an ideal additive to achieve specific benefits when used in construction work, especially when added to concrete. It can limit the width of cracks due to plastic shrinkage. Since it is a plastic material with the lowest specific gravity, less material is required to produce the finished product. It can be installed immediately after bonding with concrete, saving construction time. Less labor because fewer steps are required during construction work.

The fibers are easy to mix; they can normally be taken in pre-measured bags to be added at a rate of one bag per cubic meter of concrete. The manufacturer may recommend which fiber length to choose for this application. The fibers don't have much of an effect on workability, but they tend to slow the rate of bleeding, which can delay when the sheet can be removed. Residual strength can also be improved by PP fiber reinforcing. Polypropylene fibers are mostly utilized to improve the surface of the ground. The findings open up the possibility of using polypropylene fiber reinforcement in shallow foundations, soft-soil embankments, and other earthworks that are subjected to high strains.

5. Two Types of Polypropylene Fiber:

Polypropylene fibers can be divided into microfibers and macro fibers  based on their length and the function they perform in the concrete. They vary in length, but more important is the functionality that concrete provides.

5.1 Macro fibers



Macro fibers are sometimes referred to as structural fibers and are intended to carry loads and therefore, used to replace traditional reinforcement in certain non-structural applications as well as minimizing and/or eliminating early and late cracking. It may be capable of updating the conventional reinforcement inside the shape of metal bars and switch hundreds appearing at the structure. It can also provide resistance to plastic shrinkage but will also give concrete strength, toughness, and the ability to provide limited structural capabilities when properly designed.

Macro synthetic fibers have been shown to work with a wide range of concrete strengths. When exposed to fire, macro fibers soften as the temperature rises, melting at temperatures between 150 and 160 degrees Celsius. They're especially well-suited to providing nominal reinforcement in hostile conditions, such as marine and coastal structures, because they don't suffer from the staining and spalling that might occur when steel is corroded. They've also been employed in tram and light train systems because they're non-conducting.

5.2 Microfibers

Microfiber is commonly used to minimize initial cracks. Fibers in this category are generally classified by length, but the diameter and the aspect ratio are taken into account. Although the microfiber offers resistance to the formation of cracks due to plastic shrinkage associated with the reinforced welding wire, it cannot provide resistance to additional crack width openings due to dry shrinkage, structural loads, or other forms of stress.

5.3 macro fiber vs microfiber

6. Putting right Fiber for the right purpose concrete?

In engineering design, there are varieties of reinforcement and they're rather exclusive from every other: Primary reinforcement additionally called structural steel, is designed to hold loads. Secondary reinforcement, typically cited as “temperature and shrinkage steel,” is used to reduce the consequences of drying shrinkage and thermal enlargement and contraction.

Many components of the building industry are to blame for a number of current environmental and sustainability challenges. Aggregate and cement businesses are being monitored by environmental protection agencies to limit their demands for natural resources in order to preserve the current state of the environment and to address climate change problems.

7. 4 Tips on using Synthetic Fiber Concrete

Concrete is a versatile construction material that is utilized in a variety of construction applications all over the world. Though synthetic fibers are most typically utilized in cast-in-place concrete, they are increasingly being used in shotcrete and precast products.

7.1 Mixing

In order to generate high-quality fresh concrete, it's critical to combine the elements properly. For the appropriate workability and performance of concrete in both the fresh and hardened states, well-mixed concrete is necessary. If the concrete is not thoroughly mixed, it will segregate and bleed. Careful mixing, the right equipment, and appropriate transportation are all necessary for a successful concrete placing.

Fibers can be added with coarse and fine aggregate batch factory or at the factory or at the truck mixer in the site. Synthetic fibers do not affect the chemical hydration of cement, they work with all concrete mixes and admixtures without altering the required mixing ratio. Some textile manufacturers’ wrap their fibers in cellulose can be attached to an unopened bag Mixing drum. These bags will collapse immediately materialize and distribute the content.

Successful concrete mixing and transportation necessitates the careful regulation of numerous variables. You're ready to go on to the next vital phase, known as placement, once you've picked the right mixing and carrying equipment and handled the important factors.

7.2 Placing

Concrete placement is a crucial activity since it impacts a structure's success and long-term durability. As a result, all technical and climatic parameters must be treated with extreme caution.

The placement, distribution, and consolidation of freshly mixed concrete in the hardening area (often inappropriately referred to as pouring). Buckets, hoppers, manual or motorized buggies, chutes, and drop pipes, conveyor belts, pumps, tremies, and paving equipment are used to place concrete.

Synthetic, steel and mixed fiber reinforced concrete can be placed using traditional methods such as concrete chutes, buckets, conveyors, and pumps. Because synthetic fibers blend into the cement paste, they do not interfere with structural reinforcement systems and they have irregular shapes, such as those used for curved driveways or some products prefabricated products.

If the mixture is excessively strong, a challenge to locate, workers should not be allowed to add more water which has the potential to deteriorate the concrete that has hardened.

7.3 Finishing

Finishing is the process of leveling, smoothing, compacting, and otherwise modifying the surface of freshly put concrete to achieve the desired appearance. Finishing concrete that will be visible, such as roads, highways, or patios, is common.

Synthetic fibers are compatible with all concrete surface treatments and the patterned embossing, vision unit, broom, and hand or electric correction.

Concrete finishing is a technique for making a smooth, long-lasting surface out of concrete. Timing is vital while completing concrete, and you must pay strict attention to the concrete's state. Improper finishing processes might result in a slab that is fragile, damaged, or unsightly.

7.4 Cautions:

Commercial concrete contractors may face a variety of challenges when working on their projects. Sometimes it's due to technical concerns, such as improper concrete curing or an unsuitable material mix.

If you fail to communicate that you need two separate mixes for two distinct concrete installations at two different portions of a building, you could end up with one region that looks beautiful and the other with frazzled concrete.

Discolorations, shrinkage, scaling, and a variety of other issues are examples of concrete issues. Routine inspections are important because responding to a problem at the first warning is crucial. Concrete contractors can help with this. It’s much easier to work on many concrete repairs when you have a dependable concrete contractor on your side. If you're having trouble with one of these problems and would like professional help, call a concrete contractor.



Posted by Melacoll

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

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