NanoRebar Technology
Dense Distributed Reinforcement
Using ultra-fine high-strength micro fibers
Since 2002, we have specialized in concrete crack resistance, waterproofing, and anti-corrosion technologies.
How NanoRebar Microfiber Reinforcement Works in Concrete
Discover the engineering and science behind our 3D matrix concrete reinforcement technology.
Why Conventional Reinforcement Falls Short
Concrete cracking remains a persistent challenge in structural engineering. Conventional crack-control solutions such as polypropylene fibers and welded wire mesh can improve performance, yet their effectiveness is limited because reinforcement is not uniformly distributed throughout the concrete matrix.
Polypropylene fibers disperse within the concrete but provide limited stiffness after hardening. Welded wire mesh offers higher stiffness but exists only in a single horizontal plane, leaving most of the concrete volume unreinforced. Cracks can therefore still initiate and propagate through areas without effective reinforcement.
Introducing Dense Distributed Micro Reinforcement
Rimix NanoRebar introduces dense distributed micro reinforcement, a new approach that places a large number of micro reinforcement elements throughout the concrete matrix.
Using ultra-fine high-strength micro fibers, NanoRebar forms a dense three-dimensional reinforcement network that significantly reduces reinforcement spacing and improves crack resistance, structural toughness, and overall concrete performance.
Rimix NanoRebar transforms conventional localized reinforcement into a dense distributed micro-reinforcement system within the concrete volume.
How NanoRebar Reinforces Concrete
When Rimix NanoRebar is mixed into concrete, ultra-fine micro fibers disperse throughout the cement matrix and create a dense network of micro reinforcement elements across the concrete volume.
Because reinforcement spacing is greatly reduced, developing cracks are far more likely to encounter reinforcement elements and be restrained at an early stage.
NanoRebar fibers also possess significantly higher tensile strength and elastic modulus than conventional polypropylene fibers, enabling them to bridge cracks and transfer tensile stresses effectively.
Through the combined effects of dense distributed reinforcement and efficient crack bridging, Rimix NanoRebar improves crack resistance, toughness, and structural performance in both the plastic and hardened stages of concrete.
Theoretical Basis: Fiber Spacing Theory
The theoretical basis of Rimix NanoRebar is fiber spacing theory, proposed by American researchers Romualdi and Batson in the 1960s and widely referenced in guidance from the American Concrete Institute (ACI).
The theory states that crack resistance in fiber-reinforced concrete largely depends on the average spacing between reinforcement elements.
When fibers are finer and more numerous, reinforcement spacing becomes smaller, increasing the likelihood that developing cracks will encounter reinforcement and be restrained.
By introducing a large number of ultra-fine fibers, Rimix NanoRebar forms a dense reinforcement network that significantly reduces reinforcement spacing and improves crack interception throughout the material.
Material Performance Comparison
The effectiveness of fiber reinforcement depends on two factors:
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fiber mechanical properties
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reinforcement spacing within the concrete matrix
Rimix NanoRebar utilizes ultra-fine polyacrylonitrile (PAN) micro fibers, a high-strength synthetic fiber widely used as the precursor material for carbon fiber.
Compared with conventional polypropylene fibers used in concrete, polyacrylonitrile fibers offer significantly higher tensile strength, higher elastic modulus, and much finer diameter. These properties allow PAN micro fibers to function as high-efficiency micro reinforcement elements inside the concrete matrix.
Because a much larger number of PAN fibers can be distributed within each cubic meter of concrete, reinforcement spacing becomes significantly smaller, which greatly improves crack interception and crack control 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
With 50% lower dosage, Rimix NanoRebar introduces 3–4 times more reinforcement elements per cubic meter, forming a much denser reinforcement network.
Laboratory Verification of Rimix NanoRebar
Independent laboratory testing compared Rimix NanoRebar with conventional polypropylene fiber reinforcement.
1. Crack Control
Mortar Type
Total Crack Area (mm²)
Crack Reduction (%)
Reference Mortar
1412.7
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Polypropylene Fiber
415.3
70.6
Rimix NanoRebar
106.5
92.5
With 50% lower dosage, Rimix NanoRebar achieved 31% stronger crack control than polypropylene fibers.
2. Flexural Toughness
Concrete Type
Toughness Ratio Re
Improvement (%)
Reference Concrete
0.37
—
Polypropylene Fiber
1.57
324
Rimix NanoRebar
2.85
670
In the reported comparative test results, Rimix NanoRebar demonstrated a higher flexural toughness ratio (Re = 2.85) than polypropylene fiber concrete (Re = 1.57). Actual performance depends on the concrete mix design, fiber dosage, and testing conditions.
Engineering Value of Rimix NanoRebar
Rimix NanoRebar provides distributed micro-reinforcement throughout the concrete matrix to support crack control. It is intended to complement conventional reinforcement systems where required by structural design.
1. For Contractors
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Improve distributed crack-control performance in concrete.
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Reduce early-age cracking when properly dosed and dispersed.
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Simplify fiber incorporation through conventional concrete mixing procedures.
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Support project-specific mix optimization and improved concrete performance.
2. For Engineers and Designers
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Provide crack control in both plastic and hardened concrete
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Improve toughness and post-crack load capacity
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Enhance impact resistance and structural performance
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Enable higher-performance and more durable concrete structures
3. For Owners and Developers
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Improve long-term durability and structural reliability
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Reduce maintenance caused by cracking
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Extend the service life of concrete structures
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Achieve higher performance at a cost comparable to polypropylene fiber reinforcement
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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Why Choose Us?
Proven Expertise & Greater Savings
Since 2002
FFiber Reinforcement Expertise.
Advanced Manufacturing
for Consistent Product Quality.
Global Distribution
& Supply Chain Support.
Experience Across
Diverse Construction Projects.
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Tell us your application and we’ll recommend the right macro or micro fiber solution for your project.
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 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
It describes a large number of discrete microfibers distributed across many locations within the concrete matrix. It does not mean that the fibers form a physically connected network.
No. A higher fiber count may reduce estimated reinforcement spacing when adequate dispersion is achieved, but performance also depends on fiber orientation, bond, length, dosage, matrix properties and the test method.
No. Fiber tensile strength is one input to crack-bridging behavior. Concrete-level performance also depends on fiber–matrix interaction, distribution, dosage, crack width and loading conditions.
NanoRebar may be evaluated as an alternative to a defined polypropylene microfiber. The substitution should be based on the concrete mixture, dosage, required performance and applicable comparison testing—not a universal mass-for-mass rule.
NanoRebar should not be presented as an unconditional replacement for structural reinforcement.
Modification or replacement of specific crack-control reinforcement may only be considered when supported by engineering design, applicable testing, project requirements and approval by the responsible engineer.