SINTA® F38 synthetic fibers for concrete, are manufactured from 100% virgin polypropylene in collated, fibrillated form. Designed specifically for use in concrete, they are alkali resistant, non-absorptive and completely noncorrosive. Their use protects concrete from stresses which cause cracking while it is most vulnerable during the first 24 hours after placement. SINTA® F38 comply with ASTM Designation C1116, Standard Specification for Fiber-Reinforced Concrete and Shotcrete, Type III Synthetic Fiber-Reinforced Concrete or Shotcrete. They are available in 1.5 in. (37 mm) length.
SINTA® F38, at the appropriate dosage rate, may be used as an alternative to welded-wire reinforcement, depending on the application, to provide temperature and shrinkage crack control.
Specifically, such applications include but are not limited to, slabs on grade, pavements, overlays, sloped walls, pools, shotcrete, stucco, precast and prestressed products. It is suggested that this product be used in conjunction with properly compacted base materials and jointing in accordance with ACI guidelines and standards.
- Reduces plastic shrinkage cracking and improves durability
- Protects concrete from stresses that cause cracking
- Provides cost effective control of plastic shrinkage
- Provides overall higher quality of concrete
SINTA® F38 uniformly distribute multi-dimensionally throughout the concrete mixture. The small fibrillated fibers mechanically lock in the fresh concrete matrix providing reinforcement for the mixture while its tensile strength is the weakest. This reinforcement reduces the formation of plastic shrinkage cracking that may otherwise permanently weaken the resulting concrete. The concrete permeability is decreased, while the surface characteristics, impact and toughness properties are improved. Together these effects work synergistically to produce a long-term better quality, more durable and serviceable concrete.
SINTA® F38 may be added to concrete at any point during the batching or mixing process. SINTA® F38 may be added to the aggregate during weighing or charging, or to the central mixer or truck before, during, or after charging. The load must be mixed at high speed for 5 minutes, or 70 revolutions, after the addition of the SINTA® F38 to ensure uniform distribution. The standard range of addition for SINTA® F38 is ¾ to 3 lbs/yd3 (450 to 1800 g/m3) of concrete. Typically, 1½ lbs/yd3 (900 g/m3) of SINTA® F38 provides excellent results. Higher addition rates may be used to produce concrete when special properties are required.
Compatibility with Other Admixtures
SINTA® F38 are compatible with all GCP admixtures. Their action in concrete is purely mechanical and will not affect the hydration process. Each admixture should be added separately.
Packaging & Handling
SINTA® F38 are available in convenient Concrete-Ready® Bags which are added, unopened, to the truck drum or central mixer. The specially designed cellulose fiber bag disintegrates and disperses its contents of SINTA® F38, throughout the mix.
Fibers shall be 1.5 in. (38 mm) collated, fibrillated polypropylene fibers as supplied by GCP Applied Technologies, Cambridge, MA 02140. Required dosage rate shall be as specified by the design engineer or architect. SINTA® F38 shall be used in strict accordance with the supplier’s recommendations and within time as specified in ASTM C94. The fibers shall comply with ASTM Designation C1116 Type III 4.1.3 and with applicable building codes. Certification of compliance shall be made available on request. Standard ACI 302 procedures for placing, finishing and curing shall be followed when using SINTA® F38.
- BOCA National Building Codes, SBCCI Standard Building Code, ICBO Uniform Building Code and all supplements as adopted by the Council of American Building Officials
- Underwriters Laboratories (UL) on Series D700 and D800 metal deck assemblies
American Concrete Institute (ACI)
- ACI 544 State of the Art Report of Fiber-Reinforced Concrete
- ACI 302 Guide for Concrete Floor and Slab Construction
American Society of Testing and Materials (ASTM)
- ASTM C1116 Standard Specification for Fiber-Reinforced Concrete and Shotcrete
- ASTM C1579 Standard Test Method for Evaluating Plastic Shrinkage Cracking of Restrained Fiber Reinforced Concrete (Using a Steel Form Insert)
- ASTM C94 Standard Specification for Ready-Mixed Concrete
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Last Updated: 2022-08-16