STRUX® BT50 Synthetic Macro-Fiber

Synthetic macro-fiber ASTM C1116

Product Description

STRUX® BT50 synthetic macro fiber reinforcement is a high strength, high modulus synthetic macro reinforcement that imparts toughness, impact and fatigue properties to concrete. STRUX® BT50 is a patented engineered design providing superior post-crack control performance with a broad range of applications.

STRUX® BT50 reinforced concrete reliably achieves residual strength values in excess of 145 psi for every 4.5 lbs/yd³ (1 MPa for every 2.7 kg/m³). STRUX® BT50 fibers are 2 in. (50 mm) in length with an aspect ratio of 75 and are primarily designed to replace steel fibers, welded wire fabric, light rebar and other select secondary reinforcement in slab-on-ground flooring. STRUX® BT50 is a user friendly fiber reinforcement which is easier and safer to use, compared to other types of reinforcement.

Product Advantages

  • Unique packaging provides superior dispersion
  • Savings from reduced labor costs and shorter construction time
  • Enhances safety by eliminating handling of steel fibers, welded wire fabric or rebar
  • Eliminates proper reinforcement positioning concerns
  • Provides superior crack control due to the geometry and elastic modulus
  • Non corroding
  • Controls both plastic and drying shrinkage
  • Increased crack resistance, ductility and energy absorption or toughness
  • Improved impact resistance


STRUX® BT50 is engineered for ease of use, excellent dispersion and finishability in slab-on-ground flooring applications. STRUX® BT50 can be used in commercial, industrial and manufacturing floors, along with other select flat and form work applications. STRUX® BT50 is also ideal for use in precast tunnel segments and other select precast applications, pavements and soil stabilization projects, shotcrete and blast resistance. Please consult your GCP sales representative to discuss your specific application.


STRUX® BT50 is available in 10 lb (4.5 kg) bags.

Addition Rates

STRUX® BT50 addition rates are dependent on the specific application and desired properties and will typically vary between 7 to 15 lbs/yd3 (4.0 to 9.0 kg/m3).

Guidelines for Usage and Compatibility with Other Admixtures

STRUX® BT50 is fully compatible with the complete line of GCP admixtures. STRUX® BT50 action in concrete is mechanical and will not affect the cement hydration process. Slight mix design modifications including increases in fine aggregate contents and high range water reducer dosage rates may be required when incorporating STRUX® BT50 into a mix design. Each additional 3 - 4 lbs/yd³ (1.8 - 2.4 kg/m³) of STRUX® BT50 may reduce the slump of the concrete approximately 1 in. (25 mm). Up front addition of STRUX® BT50 into empty drums prior to batching provides optimal STRUX® BT50 dispersion in the concrete mixture. However, STRUX® BT50 may be added to the concrete at any point during the batching or mixing process. STRUX® BT50 should be mixed a minimum of 70 revolutions as specified in ASTM C94. Please consult with your GCP representative and refer to Technical Product Advantages Bulletin TB-1205 for further detail. 

STRUX® BT50 Properties

Specific gravity 0.91
Absorption None
Modulus of elasticity 1,000 ksi (7 GPa)
Tensile strength 80 ksi (550 MPa)
Melting point 320°F (160°C)
Ignition point 1,050°F (570°C)
Alkali, acid & salt resistance High | North America customer service: 1-877-4AD-MIX (1-877-423-6491)

We hope the information here will be helpful. It is based on data and knowledge considered to be true and accurate and is offered for consideration, investigation and verification by the user, but we do not warrant the results to be obtained. Please read all statements, recommendations and suggestions in conjunction with our conditions of sale, which apply to all goods supplied by us. No statement, recommendation or suggestion is intended for any use that would infringe any patent, copyright or other third-party right. 

STRUX is a trademark, which may be registered in the United States and/or other countries, of GCP Applied Technologies Inc. This trademark list has been compiled using available published information as of the publication date and may not accurately reflect current trademark ownership or status. 

© Copyright 2018 GCP Applied Technologies Inc. All rights reserved.

GCP Applied Technologies Inc., 62 Whittemore Avenue, Cambridge, MA, 02140 USA

GCP Canada, Inc., 294 Clements Road, West, Ajax, Ontario, Canada L1S 3C6

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Last Updated: 2020-01-16