NanoRebar VS PP Fiber
Superior Crack Control & Durability
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Since 2002, we have specialized in concrete crack resistance, waterproofing, and anti-corrosion technologies.
Rimix NanoRebar: Polypropylene Fiber Alternative for Concrete
Next-generation micro reinforcement technology designed to eliminate concrete plastic shrinkage cracking.
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. Request a project-specific quotation to compare material costs with polypropylene microfiber.
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. Project-Specific Quotation
Request a project-specific quotation for the proposed NanoRebar option. Compare the quoted fiber quantities, delivered material costs and applicable project requirements before making a purchasing decision.
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
Tell us your application and we’ll recommend the right NanoRebar solution.
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)
Ready for Global Delivery
Contact Our Sales & Technical Team
For product inquiries, quotations, technical support, or distribution opportunities,
contact our team directly.
Sales & Business: Sales@pioneerfibre.com
Technical Support: Support@pioneerfibre.com
Sales Manager: +1 (406) 717-9829
Technical Director: +1 (929) 569-9992
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Proven Expertise & Greater Savings
Since 2002
FFiber Reinforcement Expertise.
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& Supply Chain Support.
Experience Across
Diverse Construction Projects.
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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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Upgrade Your Polypropylene Fiber Today
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Contact Rimix™ NanoRebar Expert
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Request a Sample
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Why Choose PIONEER Rimix NanoRebar
PIONEER provides product documentation and technical support to help evaluate NanoRebar for crack-control applications in concrete and mortar.
1. Product-Specific Documentation
Request current technical data sheets, product specifications and available test reports for the supplied NanoRebar grade.
2. Mixture-Based Evaluation
Get support with dosage selection, mixing and dispersion. Confirm suitability in the intended concrete or mortar mixture.
3. Evidence-Based Comparison
Any proposed substitution for polypropylene microfiber should be supported by comparative testing at the proposed dosage. Material properties alone do not establish equivalent crack-control performance.
26,500m² production base
Advanced fiber dispersibility
Exceptional tensile strength
FAQ
Alternative microfiber systems may include fibers manufactured from other polymers or materials. Rimix NanoRebar is a refined PAN microfiber that can be evaluated as an alternative to conventional polypropylene microfiber where its fiber geometry, mechanical properties and dosage-performance characteristics are relevant.
Not in every mixture or application without evaluation. NanoRebar may replace a specific PP fiber system when trial batches and applicable testing confirm that it meets the required performance and project requirements.
The published PIONEER comparison used these two dosages. This does not establish a universal replacement ratio. The correct dosage must be confirmed for the actual concrete mixture and required performance.
The products have different fiber dimensions and mechanical properties. Which product is more suitable depends on the application, required performance, concrete mixture, production process, budget and supporting test data.
Both may be evaluated, but they should be assessed separately. Monofilament and fibrillated polypropylene fibers have different geometries and behavior, so the substitution should use the actual current product as the comparison baseline.