FAQ's of Fiber Reinforced Concrete

FAQ's of Fiber Reinforced Concrete

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WHY USE WWM?

Traditional secondary non-structural reinforcement such as welded wire mats often serves to hold concrete together after cracking rather than preventing cracks. Conversely, synthetic fibers have demonstrated capabilities to mitigate early plastic shrinkage cracks, thus enabling them to be effective in reducing instances of cracking even before they start. The correct macro fibers can also enhance the concrete's behavior post-crack, providing additional structural support.

Can Monofilament Fibers Substitute Rolled Welded Wire Fabric (WWF) in Concrete?

The answer is NO, with the exception of Jarcomesh Type 2. While some fiber manufacturers advocate for monofilament fibers as replacements for rolled wire mesh as secondary reinforcement, studies reveal that monofilament fibers can help to decrease early plastic shrinkage; however, they show limited advantages once concrete has cracked. Jarcomesh Type 2, however, has shown the necessary criteria for ICC ES AC 32 testing, thus can appropriately replace WWF.

Can Fibrillated Fibers Replace Wire Mesh in Concrete?

YES. If the wire mesh's role is non-structural, a fibrillated polypropylene fiber, provided at a minimum dosage of 1.5 lbs. per cubic yard (0.9 kg per cubic meter), can successfully act as a substitute for wire mesh, assuming they satisfy ICC requirements of a minimum strength of 50 psi. For instance, Jarcomesh Type 2 at only 2/3 lb. per yard can also replace wire mesh with enhanced strength capabilities (60 psi) and has passed impact tests.

Do Synthetic Fibers Help Reduce Cracking in Concrete?

Indeed, synthetic fibers, at the manufacturer's suggested dosage per cubic yard, have been proven to mitigate plastic shrinkage cracking in concrete. For optimal results, it's advisable to consult with the fiber supplier and review documentation that affirms Jarcomesh Type 2’s superior performance compared to other fibers available on the market.

Does the Introduction of Fiber Influence the Compressive Strength of Concrete?

Using low or high-volume synthetic fibers is not typically intended to elevate the raw strength of concrete. Generally, fibers neither significantly increase nor decrease compressive strength. However, employing higher dosages or macro/structural synthetic fibers can markedly alter the manner in which concrete cracks and fails, promoting a more ductile mode of failure that enhances overall resilience.

Are Mix Design Changes Required When Using Fiber?

The answer is both YES and NO. When fibers are introduced at standard dosage and application rates, modifications to the mix design are generally unnecessary. Conversely, should there be a considerable increase in fiber volume, some adjustments to the mix design may be needed. For guidance related to mix design and fiber dosage rates, we encourage contacting us for expert advice.

Does Using Fiber Eliminate the Importance of Proper Concrete Practices?

NO. Incorporating any synthetic fiber does not negate the need for adhering to recognized good concrete practices. It remains crucial to follow proper industry standards in terms of mixing, placing, jointing, and curing concrete effectively.

Why Does Jarco Supply Offer Various Types of Fiber Reinforcement?

The spectrum of research and development has led to the creation of multiple grades of fiber reinforcement tailored for diverse applications and performance levels. Each fiber grade is designed to deliver exceptional performance when paired with the right application.

What is the Distinction Between Monofilament and Fibrillated Fibers?

Monofilament fibers consist of single strands, similar to fishing line, whereas fibrillated fibers have irregular shapes and expand in a network-like manner, resembling a fishing net.

What Type of Fiber and Dosage Rate Does Jarco Supply Recommend?

Jarco Supply provides a variety of synthetic fibers recommended at differing dosages to achieve project performance specifications. Recommended performance-based characteristics include:

1. For controlling early life plastic shrinkage cracks: 1 bag per yard of Jarcomesh Type 1.

2. For managing shrinkage and temperature-related cracks as an alternative to lightweight non-structural wire mesh in most applications: 1 bag per yard of Jarcomesh Type 2.

3. For enhanced post-crack properties coupled with temperature crack control allowing for a welded wire mat reinforcement: 3 or more lbs. per yard of Jarcomesh Type 3.

Consult your Jarco Supply representative for engineered dosing tailored to your application.

If you are looking for more details, kindly visit reinforcing fiberglass mesh.