STRUX® 90/40 Synthetic Macro-fibers

Synthetic macro fiber reinforcement: ASTM C1116/C1116M

Product Description

STRUX® 90/40 synthetic macro-fibers are a unique form of high strength, high modulus synthetic reinforcement that is evenly distributed throughout the concrete matrix. The macro-fibers adds toughness, impact and fatigue resistance to concrete. Unlike traditional microfiber reinforcement, STRUX® 90/40 macro-fibers are specifically engineered to provide post-crack control performance.

Reinforced concrete with STRUX® 90/40 macro-fibers has been shown to reliably achieve residual flexural strength values in excess of 150 psi (1 MPa) at dosages that can easily be batched and finished. It consists of synthetic macro fibers 1.55 in. (40 mm) in length with an aspect ratio of 90 that have specifically been designed to replace welded wire fabric, steel fibers and light rebar reinforcement in slab-on-ground flooring, thin-walled precast elements and composite steel floor deck assemblies. STRUX® 90/40 macro-fibers are a user-friendly fiber reinforcement, which are easier and safer to use, compared to these other types of reinforcement.

Product Advantages

  • Saves money through lower labor costs and fewer construction days
  • Enhances safety by eliminating handling of steel fibers, welded wire fabrics or light rebar 
  • Eliminates concerns of proper positioning of reinforcement
  • Provides superior crack control due to the geometry and elastic modulus, corrosion resistant properties (non-ferric)
  • Controls plastic and long-term drying shrinkage cracks

Uses

Slab-on-Ground

STRUX® 90/40 macro-fibers are specially designed for ease of use, rapid dispersion, good finishability and improved pumpability in slab-on-ground flooring and many precast applications. They may be used in commercial, industrial and residential floors, as well as other flat work and formwork applications. The addition rate of STRUX® 90/40 macro-fibers can be easily calculated using GCP’s SDS Software, using several factors such as compressive strength of concrete, modulus of sub-grade reaction, thickness of concrete and applied loads. Please consult your GCP Applied Technologies sales representative for proper addition rate of STRUX® 90/40 macro-fibers for your application. Always consult local building codes. (Refer to Engineering Bulletin 1).

Composite Steel Floor Deck for Normal and Lightweight Concrete

STRUX® 90/40 macro-fibers can be used as a suitable alternative to welded wire fabric or light reinforcing steel specified for temperature and shrinkage reinforcement for composite steel floor deck assemblies. STRUX® 90/40 macro-fibers comply with American National Standards Institute/ Steel Deck Institute (ANSI/SDI C-1.0) design code provisions for minimum reinforcing at the minimum addition rate of 4 lb./yd3 (2.4 kg/m3). STRUX® 90/40 macro-fibers are UL (U.S.) and ULC (Canada) classified with fire ratings up to two hours for D700, F700, D800, F800, D900 and F900, except for 909 at a maximum addition rate of 5 lb./yd3 (3 kg/m3).

Addition Rates

STRUX® 90/40 macro-fiber addition rates are dependent on the specific application and desired properties, and will typically vary between 3 to 8 lb./yd3 (1.8 to 4.8 kg/m3), but could go higher.

Mix Design

The utilization of STRUX® 90/40 macro-fibers may require the use of a mid-range water reducer or a superplasticizer such as MIRA®  or ADVA® admixture to restore the required workability. In addition, slight increases in fine aggregate contents may be needed.

Please contact your GCP Applied Technologies representative with any questions. For more detailed instructions, refer to Technical Bulletin TB-1200.

Compatibility with Other Admixtures and Batch Sequencing

STRUX® 90/40 macro-fibers are compatible with all GCP admixtures. Their action in concrete is mechanical and will not affect the hydration process of the cement or compressive strength. Each liquid admixture should be added separately to the concrete mix.

STRUX® 90/40 macro-fibers may be added to concrete at any point during the batching or mixing process. After the macro-fiber addition, the concrete must be mixed at a minimum of 70 revolutions to ensure adequate dispersion.

STRUX® 90/40 PROPERTIES  
Specific gravity 0.92
Absorption None
Modulus of elasticity 1,378 ksi (9.5 GPa)
Tensile strength 90 ksi (620 MPa)
Melting point 320°F (160°C)
Ignition point 1,094°F (590°C)
Alkali, acid & salt resistance High

Packaging 

STRUX® 90/40 macro-fibers are available in 1 lb. or 5 lb. (0.5 kg or 2.3 kg) Concrete-Ready™ bags.

Flexural strength and Toughness

Flexural Strength and Toughness (Compressive Strength: 28MPa) according to ASTM C1609/C1609M-12

                         
STRUX 90/40
Dosage
Rate
Specimen cross section       Residual loads Residual strengths Toughness JCI-SF41) TR342)
Width Depth Peak
load
Peak
strength
Peak-load
deflection
P 150 P 150 ƒ 150 ƒ 150 T 150 fe,3 Re,3
600 150 600 150 150
(mm) (mm) Pp (N) fp(MPa) δp(mm) (N) (N) (MPa) (MPa) (Joule) (MPa) (%)
0.19% (1.8 kg/m3) 152 151 29,813 3.90 0.048 5,776 4,236 0.75 0.55 18 0.80 20.0%
0.32% (3.0 kg/m3) 152 152 31,422 4.10 0.020 8,472 6,932 1.10 0.90 27 1.15 28.5%
0.50% (4.6 kg/m3) 152 151 30,513 4.00 0.050 12,323 10,012 1.60 1.30 37 1.60 40.5%

Flexural Strength and Toughness (Compressive Strength: 4,000 psi) according to ASTM C1609/C1609M-12

                         
STRUX 90/40
Dosage
Rate
Specimen cross section       Residual loads Residual strengths Toughness JCI-SF41) TR342)
Width Depth Peak
load
Peak
strength
Peak-load
deflection
P 150 P 150 ƒ 150 ƒ 150 T 150 fe,3 Re,3
600 150 600 150 150
(in.) (in.) Pp (lbf) fp(psi) δp(in.) (lbf) (lbf) (pso) (psi) (ibf-in.) (psi) (%)
0.19% (3.0 lb/cyd) 6.00 5.95 6,702 565 0.0019 1,299 952 110 80 160 115 20.0%
0.32% (5.0 lb/cyd) 6.00 6.00 7,064 595 0.0020 1,905 1,558 160 130 240 165 28.5%
0.50% (7.75 lb/cyd) 6.00 5.95 6,860 580 0.0020 2,770 2,251 230 190 330 230 40.5%
1) Japan Concrete Insitute (JCI): “Standard Test Method for Flexural Strength and Flexural Toughness of Fiber Reinforced Concrete, (Standard SF4),” JCI Standards for Test Methods of Fiber Reinforced Concrete, Japan Concrete Institute, 1983   [ fe,3 = 450*T150150/(Width*Depth2) ]
2) The Concrete Society. Technical Report 34 Concrete industrial ground floors - A guide to their design and construction, The Society, Crowthome, 2003
 

Note: Residual strength values and curves represent typical behavior and depend on the mix design, concrete strength and fiber dosage rates.

 

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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.

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Last Updated: 2019-03-07

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