Hollow, composite rebar structure, associated fabrication methodology, and apparatus
First Claim
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1. A rebar structure for concrete reinforcement, comprising:
- an elongate tubular central wall portion having an inside surface and an outside surface, formed circumferentially around a core axis, the central wall portion including fibers comprising at least one of glass, carbon, and basalt, the fibers mostly being oriented longitudinally parallel to the core axis, andan inner wall portion bonded to the inside surface of the central wall portion, the inner wall portion including a continuous filament fiber mat of randomly oriented glass or carbon fibers, the inner wall portion having a higher percentage of fibers oriented non-parallel to the core axis as compared to the central wall portion.
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Abstract
A rebar structure for concrete reinforcement may include an elongate tubular central wall portion having an inside surface and an outside surface. The central wall portion may be formed circumferentially around a core axis and may include glass or carbon fibers mostly being oriented longitudinally parallel to the core axis. The rebar structure may include an inner wall portion bonded to the inside surface of the central wall portion. The inner wall portion may include glass or carbon fibers and may have a higher percentage of fibers oriented non-parallel to the core axis as compared to the central wall portion.
59 Citations
20 Claims
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1. A rebar structure for concrete reinforcement, comprising:
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an elongate tubular central wall portion having an inside surface and an outside surface, formed circumferentially around a core axis, the central wall portion including fibers comprising at least one of glass, carbon, and basalt, the fibers mostly being oriented longitudinally parallel to the core axis, and an inner wall portion bonded to the inside surface of the central wall portion, the inner wall portion including a continuous filament fiber mat of randomly oriented glass or carbon fibers, the inner wall portion having a higher percentage of fibers oriented non-parallel to the core axis as compared to the central wall portion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A rebar structure for concrete reinforcement, comprising:
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an elongate tubular first wall portion having an inside surface and an outside surface, formed circumferentially around a core axis, the first wall portion including fibers comprising at least one of glass, carbon, and basalt, the fibers mostly being oriented longitudinally parallel to the core axis; and an elongate tubular second wall portion having an inside surface and an outside surface, the second wall portion bonded to the first wall portion, the second wall portion including a continuous filament fiber mat of glass or carbon fibers, the fiber mat having fibers which point in random directions, having at least one component around the core axis, relative to the fibers in the first wall portion. - View Dependent Claims (15, 16, 17, 18)
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19. A rebar structure for concrete reinforcement, comprising:
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an elongate tubular central wall portion having an inside surface and an outside surface, formed circumferentially around a core axis, the central wall portion including fibers comprising at least one of glass, carbon, and basalt, the fibers mostly being oriented longitudinally parallel to the core axis, an inner wall portion bonded to the inside surface of the central wall portion, the inner wall portion including glass or carbon fibers, the inner wall portion having a higher percentage of fibers oriented randomly and non-parallel to the core axis as compared to the central wall portion, and an elongate tubular outer wall portion bonded to the outside surface of the central wall portion, the outer wall portion including fibers comprising at least one of glass, carbon, and basalt, the outer wall portion having a higher percentage of fibers oriented randomly and non-parallel to the core axis as compared to the central wall portion, wherein an outside surface of the outer wall portion has a purchase enhancing structure including a first plurality of grooves formed in the outside surface and a second plurality of grooves formed in the outside surface, each of the grooves in the first plurality of grooves intersecting a groove in the second plurality of grooves at an angle. - View Dependent Claims (20)
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Specification