Optimized geometries of fiber reinforcement of cement, ceramic a

Details Optimized geometries of fiber reinforcement of cement, ceramic a Optimized geometries of fiber reinforcement of cement, ceramic a

1999-08-25

2000-05-09

Weisberger, Richard

Stock material or miscellaneous articles

Coated or structually defined flake, particle, cell, strand,...

Rod, strand, filament or fiber

428358, 428361, 428364, 428392, 428394, D02G 300

Patent

active

060601639

ABSTRACT:
Fibers, continuous or discontinuous, and bars having optimized geometries for use in the reinforcement of cement, ceramic and polymeric based matrices are claimed. The geometries are designed to increase the ratio of surface area available for bond between the fiber and the matrix to the cross-sectional area of fiber. In the case of a continuous reinforcement comprised of a single fiber or a bar made out of a bundle of fibers, such as is the case in reinforced and prestressed concrete, increasing the surface area available for bond leads to a decrease in crack width, development length, and transfer length. The fibers or bars are also configured to be amenable for twisting or to have spiral like deformations along their longitudinal axis to further develop the mechanical component of bond between the fibers and the matrix. Additional methods of mechanical bond enhancement, such as crimping and/or addition of anchorages, such as hooked ends, paddles, buttons, etc. . . . , can be applied to the claimed fibers to further improve their bond characteristics.

REFERENCES:
patent: 305226 (1884-09-01), Ransome
patent: 3650785 (1972-03-01), Ball et al.
patent: 4078940 (1978-03-01), Marsden
patent: 4461855 (1984-07-01), Phillips
Ernest L. Ransome--Concrete Designer, Constructor, Inventor, M.K. Hurd, Concrete International, May 1996 pp. 50-51.
Handbook of Fillers and Reinforcements for Plastics, Harry S. Katz, pp. 604-609.

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