Reinforcing fiber sheet and concrete structure using same
AssigneeTonen Corporation
InventorMakoto Saito
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Abstract
The present invention has an object to provide a reinforcing fiber sheet which permits sufficient reinforcement of a concrete structure with a smaller number of layers than in the conventional cases, without causing fracture of the sheet within a range of yielding of reinforcing bars. The reinforcing fiber sheet 1 of the invention comprises high-elasticity and high-elongation carbon fibers 4 having a modulus of elasticity of at least 35 ton/mm.sup.2 and a fracture elongation of at least 0.9%, arranged in an amount of at least 250 g/m.sup.2 in one direction through an adhesive layer 3 on a substrate sheet 2. The object of the invention can be achieved by providing the carbon fibers 4 of the reinforcing fiber sheet 1 with the above-mentioned properties.
Claims17
A concrete structure which is formed by adhering a single layer of reinforcing fiber sheet which comprises a substrate sheet and high-elasticity and high-elongation carbon fibers arranged in one direction on the substrate sheet through an adhesive layer, to a surface of a concrete structure having reinforcing bars by aligning the orientation of the carbon fibers with the direction of the reinforcing bars of the concrete structure, and then curing a thermosetting resin impregnated into the carbon fibers, thereby forming reinforcing layer of a fiber-reinforced composite material, wherein the carbon fibers have a modulus of elasticity of at least 35 ton/mm.sup.2 and a fracture elongation of at least 0.9%, and the reinforcing fiber sheet has the carbon fibers in an amount of at least 250 g/m.sup.2.
A reinforced concrete structure comprising:
- a concrete structure having reinforcing bars and a single layer of reinforcing fiber sheet comprising a substrate sheet, an adhesive layer, and a plurality of carbon fibers having a modulus of elasticity of at least 35 ton/mm.sup.2, a fracture elongation of at least 0.9%, and a unit weight on the fiber sheet of at least 250 g/m.sup.2,
- the reinforced fiber sheet being adhered to the concrete structure with the plurality of carbon fibers aligned in the direction of the reinforcing bars of the concrete structure, a thermosetting resin being impregnated into the plurality of carbon fibers and allowed to cure thereon.
Dependencies are inferred from the claim text.