United States Department of Transportation
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Alternative Title:Evaluation of fiber reinforced concrete.
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Abstract:This study was conducted to evaluate the physical properties of plastic and hardened fiber reinforced concrete using three basic types of fibers: steel, fiberglass and polypropylene. Fibers have been shown to increase flexural and tensile strength, ductility and toughness of concrete.
In this study, air content and water/cement ratio were varied to keep slump in a workable range (2 to 4 inches) and air contents at 5 percent +/- 1 percent. Mixes with flyash and super plasticizers were also tested. The same cement and aggregate was used for all mixes. When used, flyash and admixture type were the same also. Both 6 and 8 bag mixes were examined.
The results of this evaluation indicate that the addition of steel fibers, especially those with a high aspect ratio, in concrete improves flexural toughness, an indicator of ductility and crack resistance. Steel fibers also increased splitting tensile strength. The addition of super plasticizers enhances these qualities further and also increases compressive and flexural strength which were not increased through the use of fibers alone. With the addition of fibers in concrete, no physical properties were adversely affected but no significant improvements over non fiber reinforced concrete were noted in modulus of elasticity, Poisson's ratio, shrinkage or durability over non fiber reinforced concrete.
A recommendation is made that the department continue to employ the use of fiber in concrete in thin bonded overlays and in structural applications where crack control is desired.
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