Abstract: The present invention relates to an improved concrete additive product comprising synthetic concrete reinforcing fibers packaged in a closed paper package, whereby under the influence of mechanical action in a concrete mixer, the packaging material disintegrates and the fibers are uniformly distributed throughout the fresh concrete mixture. The synthetic fibers may additionally be coated with a dispersant. The present invention also relates to the methods of using the above improved concrete additive product.

Abstract: The present invention relates to a method for modifying the properties of a concrete by introducing a solid admixture, contained in a paper package, into a fresh concrete, said solid admixture being selected from the group consisting of air-entraining admixtures, air detrainer admixture, accelerating admixture, alkali-reactivity reducer, superplasticizer, pumping aids, water-reducing admixture, corrosion inhibitor, permeability reducer, fibers, and mixtures thereof; and mixing the fresh concrete in a batch type mixer for sufficient time to cause the packaging material to disintegrate and distribute the admixture relatively uniformly throughout the fresh concrete.