ACI 549.5R-16 Report on Spray-Up and Continuous Strand Glass Fiber-Reinforced Concrete (GFRC)

ACI 549.5R-16 Report on Spray-Up and Continuous Strand Glass Fiber-Reinforced Concrete (GFRC). 2.2—Defnitions acrylic copolymer—acrylic thermoplastic copolymer is a resinous substance made by reacting acrylic monomers together; the type of copolymer used in concrete and glass fber-reinforced concrete is an emulsion of submicron-size polymer particles dispersed in water. alkali-resistant glass fber—glass fber using at least 16 percent zirconia by mass. characteristic strength—value of a strength; for example, fexural, above which 95 percent of the population of all possible measurements of that strength are expected to lie. creel—framework designed to support roving or bobbins of yarn while being fed into a weaving loom or flament winding machine. externally bonded fabric-reinforced cementitious matrix—composite material consisting of a sequence of one or more layers of cement-based matrix reinforced with dry fbers in the form of open single or multiple meshes that, when adhered to concrete or masonry structural members, forms a fabric-reinforced cementitious matrix system. flament—single glass fber, sometimes called a monoflament. flamentizing—dispersion of a multiflament strand into individual flaments. fex-anchor—L-shaped rod or bar that connects the glass fber-reinforced concrete skin to the panel frame. glass fber-reinforced concrete—cementitious mixture containing at least 4 percent alkali-resistant glass fber by total mass of composite; usually manufactured by the spray- up process. glass fber-reinforced concrete premix—mixture of prechopped alkali-resistant glass fbers; cementitious mate- rials; water; chemical admixtures; fne aggregate; and, if required, coarse aggregate. glass fber strand—group of flaments of predetermined quantity—50, 100, 200, or 400 flaments per strand— bundled together to resist splitting (flamentizing). gravity anchor—rods, bars, or plates that transfer the weight, or gravity load, of the glass fber-reinforced concrete panel to the supporting frame. high integrity—describes a characteristic of particular glass fber strands that are diffcult to break down into indi- vidual flaments during processing or mixing. leno weave—weave structure in which paired warp yarns, or strands, are intertwined in a series of fgure eights and flling yarn, or strand, is passed through each of the inter- stices so formed, producing a frm, open mesh. proportional elastic limit—limit of stress beyond which the strain is not wholly recoverable. roving—number of parallel, continuous, not twisted, glass fber strands bundled together and wound to form a cylindrical package. scrim—structured form of glass fber reinforcement in which continuous strands or yarns are laid down to produce a nonwoven grid pattern; also known as mesh. textile-reinforced concrete—fber-reinforced concrete composite in which the alkali-resistant glass fber is a...