Innovative Synthetic Fibers

Abstract

The article describes a recently patented high-tensile-strength synthetic fiber that partially fibrillates upon mixing and shooting, increasing its final surface area and bonding capabilities to the concrete. The fibers are introduced to the concrete mixer as monofilament units of relatively low surface area, allowing fiber dosages of up to 2% volume (18.5 kg/cubic m [31.2 lb/cubic yd]). During the mixing process, each fiber transforms into a unit having several fibrils at its ends. The fibrils anchor each fiber so their bonding capabilities are superior to those of conventional smooth and deformed monofilament fibers. The high number of fine fibrils in the concrete reduces plastic shrinkage cracking. Most importantly, these fibers have demonstrated an improved ability to increase the toughness and energy absorption capability of the concrete.