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New Acrylic Fiber Imparts Crack Control, Alkali Resistance, Improved Toughness

Raditeck AC 60, a concrete-grade acrylic fiber dosed at 0.66–1.0 lbs./yd., made a North American debut at the National Precast Concrete Association’s 2010 Precast Show in Phoenix

Sources: ICF Mercantile, Ft. Lee, N.J.; CP staff

Raditeck AC 60, a concrete-grade acrylic fiber dosed at 0.66Ò1.0 lbs./yd., made a North American debut at the National Precast Concrete Association's 2010 Precast Show in Phoenix. The acrylic has been chemically and mechanically modified to impart plastic shrinkage cracking resistance. In hardened concrete slabs or structures, Raditeck fibers lower permeability, increase resistance to alkali attack from deicing compounds, and improve toughness properties, says David Ronner of ICF Mercantile, which is overseeing concrete market development for Radici Fibers. The acrylic's ionic charges give the fibers good bonding characteristics in the concrete matrix.

The 6-mm-long Raditeck AC fibers are packaged in water-soluble 1.0-lb. and 1.3-lb. bags or in bulk 727-lb. pressed bales. Based on an ICF-recommended, minimum five-minute mixing cycle, the fibers disperse evenly in the concrete matrix without surface protrusion. Augmenting matrix distribution is their specific gravity, 1.17 g/cm versus 1.00 g/cm for water. In CTLGroup-performed ASTM C 1579 testing, Raditeck AC specimens with 0.66 lb./yd. and 1.0 lb./yd doses exhibited minimal and no plastic shrinkage cracking, respectively. ICF Mercantile is handling the rollout through direct sales, [email protected]