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Will the use of fibers impact the compressive strength of the concrete?

Q. Will the use of fibers impact the compressive strength of the concrete?

 

A. At typical dosages of less than 0.5% by volume, the effect of fibers on the compressive strength of concrete is marginal to negligible.

 

References: ACI 544.1R, ACI 544.3R

Topics in Concrete: Concrete Fundamentals, Fiber Reinforced Concrete