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Since 2002, we have specialized in concrete crack resistance, waterproofing, and anti-corrosion technologies.
Still Using Polypropylene Fiber? It’s Time to Go Beyond
Rimix™ NanoRebar Concrete Fiber Reinforcement for Crack Control & Toughness
Issues with Polypropylene Fiber in Concrete
Polypropylene fiber (PP fiber) is widely used for crack control in concrete and is a common solution in fiber reinforced concrete (FRC). However, in practical construction, its performance is often limited, especially in applications requiring long-term crack control and durability.
1. Low Strength – Limited to Early Crack Control
Polypropylene fibers have relatively low tensile strength and are mainly effective during the plastic stage, helping reduce early shrinkage cracking. After hardening, their crack-control effect becomes minimal, making them less effective for cracks caused by loading and long-term shrinkage.
2. Low Modulus – Limited Toughening Effect
With a much lower elastic modulus than concrete, polypropylene fibers cannot effectively engage once cracks form. As cracks propagate, their contribution to toughness and post-crack performance remains limited.
3. Limited Fineness – Higher Dosage Required
Although classified as micro synthetic fibers for concrete, polypropylene fibers cannot be made significantly finer due to material limitations. This restricts fiber count per unit volume, often requiring higher dosage in fiber reinforced concrete to achieve effective crack control.
What Is Rimix™ NanoRebar Concrete Fiber?
Rimix™ NanoRebar is a high-performance micro synthetic fiber made from refined polyacrylonitrile (PAN fiber), originally derived from carbon fiber precursor technology. It is designed for fiber reinforced concrete (FRC) applications, providing both early-stage crack control and long-term crack resistance.
Compared with traditional polypropylene fiber, NanoRebar offers significantly higher tensile strength and modulus, allowing it to work not only during the plastic stage, but also after concrete hardening.
By improving toughness and crack resistance, it helps reduce cracking, enhance durability, and improve overall performance in high-performance concrete (HPC) and ultra-high-performance concrete (UHPC).
Thanks to its ultra-fine diameter, NanoRebar delivers a higher fiber count at lower dosage, achieving more effective crack control with comparable overall cost to polypropylene fiber.
Upgrade to a More Effective Concrete Fiber Solution.
How NanoRebar Reinforces Concrete
Crack control in fiber reinforced concrete is governed by fiber spacing theory, proposed by Romualdi and Batson and widely referenced in ACI guidance. The theory states that crack resistance depends on reinforcement spacing: the closer the spacing, the higher the probability that cracks will be intercepted and restrained.
Rimix™ NanoRebar is designed based on this principle. Its ultra-fine PAN-based fibers provide a much higher fiber count per unit volume, resulting in closer spacing between reinforcement elements. This increases the likelihood that micro-cracks are intercepted early, reducing crack development throughout the concrete.
In addition, NanoRebar fibers have significantly higher tensile strength and elastic modulus than conventional polypropylene fiber, enabling effective crack bridging and stress transfer in both plastic and hardened stages. This results in improved crack resistance, enhanced toughness, and more reliable performance in concrete.
NanoRebar Fiber Reinforcement Inside Concrete
NanoRebar vs Polypropylene Fiber
Compared with polypropylene fiber, NanoRebar features a finer fiber diameter and provides a significantly higher fiber count per unit volume, resulting in more effective crack control. Its higher tensile strength and elastic modulus further enhance crack resistance, contributing to improved durability and overall concrete performance.
Property
Polypropylene Fiber
Rimix™ NanoRebar
Typical Fiber Diameter
20–48 μm
≈ 11 μm
Tensile Strength
300–450 MPa
600–900 MPa
Elastic Modulus
3–3.5 GPa
7–10 GPa
Recommended Dosage
0.9 kg/m³
0.45 kg/m³
Fiber Count per m³
≈ 0.6–1.0 Billion
≈ 2.7 Billion
Lower dosage, more fibers, superior performance
Benefits of Rimix™ NanoRebar
Rimix™ NanoRebar enhances concrete performance through high fiber count and distributed micro-reinforcement, offering clear advantages over conventional polypropylene fibers.
1. More Effective Crack Control
At approximately half the dosage, Rimix™ NanoRebar provides several times more reinforcement elements. This increases the probability of intercepting micro-cracks early and reduces visible cracking in slabs and structural elements.
2. Full-Stage Crack Control
With higher tensile strength and modulus, Rimix™ NanoRebar remains effective in both the plastic and hardened stages of concrete. It helps control early shrinkage cracking as well as later-stage cracking caused by loading and drying shrinkage.
3. Improved Toughness and Structural Reliability
By enabling effective crack bridging, Rimix™ NanoRebar enhances concrete toughness and reduces brittle behavior. This improves performance under impact, repeated loading, and long-term service conditions.
4. Comparable Overall Cost
Despite improved reinforcement efficiency, Rimix™ NanoRebar achieves these benefits at a comparable cost per cubic meter. Lower dosage combined with higher effectiveness makes it a practical upgrade without increasing overall project cost.
High strength and high modulus fiber for concrete reinforcement
Standards & Compliance
Rimix™ NanoRebar micro synthetic fiber meets major international standards for concrete reinforcing fiber applications:
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ASTM C1116 – Fiber Reinforced Concrete
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EN 14889-2 – Polymer Fibers for Concrete
Applications of Rimix™ NanoRebar
Rimix™ NanoRebar is used in fiber reinforced concrete (FRC) applications requiring effective crack control and durability.
It is suitable for both standard concrete and HPC / UHPC systems.
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High-durability slabs, floors & pavements
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Precast concrete elements
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Industrial floors and heavy-traffic platforms
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Waterproof structures: basements, tanks, pools, tunnels
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Shotcrete for tunnels & underground work
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Infrastructure & Marine
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High-performance and ultra-high-performance concrete
Trusted in Engineering Projects Worldwide
How to Use Rimix™ NanoRebar
Rimix™ NanoRebar is available in multiple lengths and packaging options to suit different fiber reinforced concrete and shotcrete applications.
Lengths: 6 mm, 12 mm, 18 mm
Dosage：0.45–0.9 kg/m³
Packaging: Bulk loose fiber in ton bags or carton packaging (small packs in plastic or water-soluble bags)
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An advanced micro synthetic fiber engineered for fiber-reinforced concrete (FRC), delivering optimized performance for modern high-performance concrete applications.
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Why Choose Us?
Proven Expertise & Greater Savings
22 years of focus
on concrete protection solutions.
20+ patents & awards
In concrete durability technology
20+ countries served
with global product distribution.
1,000 projects proven
in diverse applications worldwide.
FAQ
Polypropylene fiber is effective for controlling plastic shrinkage cracking, but its low modulus and wide spacing limit its performance in hardened concrete and long-term durability.
The key limitation is low reinforcement efficiency. With relatively low fiber count per cubic meter, crack interception probability is reduced.
High-performance fibers such as PAN, PVA, and basalt fibers offer higher tensile strength and modulus, improving crack bridging, toughness, and durability.
Because they rely on higher material strength rather than distribution efficiency, leading to increased material cost.
NanoRebar uses ultra-fine PAN micro fibers to significantly increase fiber count and reduce spacing, forming a dense reinforcement network.
Contact Us
For product inquiries, OEM/ODM partnerships, or becoming a distributor: Sales@pioneerfibre.com
For technical support and application guidance: Support@pioneerfibre.com
Regional WhatsApp Support
We typically respond within 24 hours, ensuring your project continues without delays.
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Americas: +1 (702) 307-8327
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Europe: +86 151 6240 5106
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Middle East & Africa：+1 (949) 317-7180
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Asia-Pacific：+86 190 1543 5408
