FAQs on FRC
FAQs on Fiber Reinforced Concrete (FRC)
When discussing fiber-reinforced concrete (FRC), it’s important to understand the distinctions and applications of various fiber types, including macrofibers and microfibers. For more details, visit well.
Understanding Specifications
The primary difference between macrofibers and microfibers lies in their size, commonly measured by equivalent diameter or linear density. In the FRC industry, the linear density is often expressed in terms of denier, which indicates the mass of the fiber in grams per 9,000 meters. ASTM standards such as ASTM D/DM and ASTM A820/A820M provide detailed specifications for classifying synthetic fibers, cellulose fibers, and steel fibers respectively. The ASTM A820 specifically outlines minimum requirements for Steel Fibers used in concrete.
Applications of Different Fiber Types
Microfibers are typically employed to mitigate plastic shrinkage cracking in concrete. Fibrillated microfibers can serve as an alternative to light-gage welded-wire reinforcement for controlling temperature and shrinkage cracking at specified dosages. In contrast, macrofibers significantly enhance the structural integrity of concrete, providing benefits such as post-crack residual strength and improved durability.
Frequently Asked Questions about Fiber Reinforced Concrete
Why Use Wire Mesh Reinforcement?
Wire mats are traditionally used to hold concrete together post-crack. However, synthetic fibers effectively reduce early plastic shrinkage cracks, enhancing the concrete's overall performance.
Can Monofilament Fibers Replace Rolled Wire Fabric?
Generally, no, except for the Jarcomesh Type 2. Monofilament fibers can reduce early plastic shrinkage, but their post-crack benefits are limited. Jarcomesh Type 2 has passed significant testing to be considered a replacement.
Can Fibrillated Fibers Replace Wire Mesh?
Yes, provided that non-structural wire mesh is used. Fibrillated fibers can replace this as secondary reinforcement, meeting specific ICC requirements.
Do Synthetic Fibers Reduce Cracking?
Yes, when used at recommended dosage rates, synthetic fibers can effectively reduce plastic shrinkage cracking in concrete.
Effect on Compressive Strength
The inclusion of fibers does not significantly affect raw compressive strength, but they improve ductility and alter how concrete fails under stress.
Mix Design Changes
While standard dosages require no mix design changes, significant increases in fiber volume may necessitate adjustments. It’s advisable to consult for mix design guidance.
Importance of Good Practices
Synthetic fiber use does not substitute the need for traditional concrete practices, including proper mixing, placing, jointing, and curing.
Why Offer Different Fiber Reinforcement Types?
Different applications require various performance levels, leading to the development of multiple fiber grades. Each grade provides distinct performance benefits tailored to specific needs.
What is the Difference Between Monofilament and Fibrillated Fibers?
Monofilament fibers are single strands, while fibrillated fibers have a net-like, irregular shape for improved anchorage and distribution in concrete.
Recommended Fiber Types and Dosages
Jarco Supply suggests varying types based on application needs, including Jarcomesh Type 1 for plastic shrinkage control and Jarcomesh Type 3 for enhanced crack control
About Pumping and Precast Applications
Jarcomesh fibers can be pumped effectively and used in precast product manufacturing to enhance toughness and reduce breakage risk.
Utilization in Shotcrete and Elevated Slabs
Jarcomesh fibers are suitable for shotcrete applications and can replace traditional reinforcements in elevated slab systems, enhancing performance and safety.
For detailed inquiries or to explore Refractory Stainless Steel Fiber options, please reach out to us. Our experts are ready to assist you with professional guidance.