TECHNICAL NOTES U.S. DEPARTMENT OF AGRICULTURE SOIL CONSERVATION SERVICE STATE OFFICE STILLWATER, OKLAHOMA 74074 ENGINEERING TECHNICAL REFERENCES FOR IN SERVICE USE ONLY January 26, 1993 Engineering OK-14 Re: Fiber Reinforced Concrete This technical note provides guidance on the characteristics and use of fiber reinforced concrete (FRC). It also includes a copy of William H. Erion's paper on "Fiber Reinforced Concrete Slabs on Grade", dated May 1992. FRC is a non-structural shrinkage reinforcement and is not a replacement for primary or structural reinforcement members. The principal of adding fibers to concrete is similar to adding straw to mud bricks or animal hair to plaster. Some known effects of the use of fiber in FRC include: Advantages: - Helps reduce damage due to impact (shatter) and abrasion. (Use of equipment such as front end loader shows reduced chipping). - Reduces size of shrinkage cracks which reduces random planes of weakness. (Concrete may crack just as much, but cracks are very fine or hairline type). - Helps control plastic settlement and shrinkage. (Fibers act as a cohesive element, binding the mix together). - Reduces slump. (May cause contractor to want to add more water to mix which would reduce concrete strength. Instead, recommend he use a superplasticizer or a low range water reducer). - Increases cohesiveness which decreases "bleeding" of water from concrete. Disadvantages: - Cannot control cracking due to external stress. - Cannot control crack width. - Cannot provide shear friction transfer across cracks. - Does not allow increased joint spacing over non-reinforced concrete. - Does not decrease slab thickness over non-reinforced concrete.
ENGINEERING TECHNICAL REFERENCES
May 20, 2023
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