High performance composite macrofiber for concrete reinforcement

MiniBars™ solution is a high-performance composite macrofibre, based on an alkali-resistant glass fibre or basalt and engineered to provide high post-cracking strength to concrete while at the same time increasing toughness, impact, and fatigue resistance of concrete. MiniBars™ macrofibre can be used as secondary and/or as primary reinforcement. MiniBars™ fibre disperses quickly and evenly throughout the concrete matrix, due to their specific gravity being similar to concrete. This promotes uniform performance throughout the concrete mass.


  • Improves post-cracking mechanical properties of hardened.

  • Concrete Fast and uniform dispersion during mixing.

  • Does not affect concrete pumpability when following recommended practices.

  • Allows for high dosages with minimum effect on processability. (mix dependent)

  • Does not corrode.

  • No additional water demands.

  • Easy to handle.


MiniBars™ solution has been specifically designed to reduce or replace secondary and/or primary steel reinforcement in many structural applications requiring flexural tensile and post-crack performance (wall panels, pipes, water tanks, tunnel segments, marine structures, raft foundations, etc.)

Technical Characteristics

Material Fiber Length Fiber Diameter Specific Gravity Modulus of Elasticity Tensile Strength
Alkali-resistant glass+ thermoset resin 43 +/-2 mm*
1.7 +/- 0.08 in.
0.70 mm
0.03 in.
2.0 ± 0.1 42 GPa
6,091,585 psi
> 1000 MPa /
145,038 psi
Material Alkali-resistant glass+ thermoset resin
Fiber Length 43 +/-2 mm*
1.7 +/- 0.08 in.
Fiber Diameter 0.70 mm
0.03 in.
Specific Gravity 2.0 ± 0.1
Modulus of Elasticity 42 GPa
6,091,585 psi
Tensile Strength > 1000 MPa /
145,038 psi

* Shorter or longer fibers are available on request.

Mechnical Performance

The fundamental mechanical performance of fiber reinforced concrete can be obtained from a three-point bending test performed on a prismatic beam of 150×150×550mm (6×6×22in.) including a notch at mid-span (EN 14651). The displacement-controlled testing system introduces a specific deflection or CMOD (Crack Mouth Opening Displacement) rate, and records load and displacement up to a CMOD limit of 3.5 mm (0.14 in). The fiber reinforced concrete performance is evaluated by means of residual flexural strength values at 0.5, 1.5, 2.5, and 3.5mm (0.02, 0.06, 0.10, and 0.14in.) of CMOD, namely fR1, fR2, fR3 and fR4, respectively.

According to the fib Model Code 2010, the constitutive law of the material in tension is defined by means of the tensile stresses fFts and fFtu, calculated from fR1 and fR3 for service and ultimate limit state, respectively.

This information and data contained herein is offered solely as a guide in the selection of reinforcement. The information contained in this publication is based on actual laboratory data and field test experience. We believe this information to be reliable, but do not guarantee its applicability to the user’s process or assume any responsibility or liability arising out of its use or performance. The user agrees to be responsible for thoroughly testing any application to determine its suitability before committing to production. It is important for the user to determine the properties of its own commercial compounds when using this or any other reinforcement. Because of numerous factors affecting results, we make no warranty of any kind, express or implied, including those of merchantability and fitness for a particular purpose. Statements in this publication shall not be construed as representations or warranties or as inducements to infringe any patent or violate any law, safety code or insurance regulation. ReforceTech reserves the right to modify this document without prior notice. All Rights Reserved. Pub number: 10021900. MiniBars™ product sheet_ww_02-2017_Rev0_EN. May 2021