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Preparation method for SFCB (Steel-Fibre Composites Bar)

A steel bar and prefabricated technology, applied in the field of SFCB bar preparation, can solve the problem of insufficient bonding force between the inner core steel bar and the outer composite material, affecting the synergistic force between the inner core steel bar and the outer composite material, and failing to achieve the effect of use, etc. problem, to achieve the effect of good bonding effect, good alkali corrosion resistance and good overall performance

Inactive Publication Date: 2019-12-06
ARMY ENG UNIV OF PLA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the current SFCB bars have the problem of insufficient bonding force at the interface between the inner core steel bar and the outer composite material, which affects the coordinated force of the inner core steel bar and the outer composite material during the stress process, and cannot achieve the ideal use effect.

Method used

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  • Preparation method for SFCB (Steel-Fibre Composites Bar)
  • Preparation method for SFCB (Steel-Fibre Composites Bar)
  • Preparation method for SFCB (Steel-Fibre Composites Bar)

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Choose a smooth round bar with a diameter of 8mm as the inner core steel bar 1. The three-dimensional weaving machine circular weaving process is adopted, and the two-step method is adopted. The inner core steel bar 1 is used as the axial fixed unit, and the basalt fiber moves around the steel bar to weave the SFCB bar prefabricated body. Wherein, the cross-sectional area of ​​the fiber 2 should not be smaller than the cross-sectional area of ​​the inner core steel bar (1).

[0026] (2) Evenly coat a layer of release agent on the molding mold, impregnate the SFCB prefabricated body with bisphenol A epoxy resin, put it into the molding mold, and heat up to 80°C for 30 minutes; then raise the temperature to 160°C, pressurize To 10Mpa, hold for 60s, solidify and shape.

[0027] The SFCB bars prepared in this example have a strength of 730 MPa and a secondary stiffness of 51 GPa. In the alkaline solution prepared by ACI440.3R, placed at 60°C for 1 month, the residual ...

Embodiment 2

[0029] (1) Select the deep rib bar with an inner diameter of 8mm as the inner core steel bar 1. The steel bar is wound with carbon fiber, so that the space between the ribs is filled and the surface of the ribbed bar is smooth. The circular weaving process of the three-dimensional braiding machine is adopted, and the four-step method is adopted. The inner core steel bar 1 is used as the axial fixed unit, and the carbon fiber moves around the steel bar in an interlaced manner to weave into a three-dimensional five-directional SFCB bar prefabricated body. Wherein, the cross-sectional area of ​​the fiber 2 should not be smaller than the cross-sectional area of ​​the inner core steel bar 1 .

[0030] (2) Apply a layer of release agent evenly inside the mold, put the SFCB tendon prefabricated body into it, spread the diversion net, seal the vacuum bag and evacuate it, raise the temperature to 120°C, and inject vinyl resin into it , followed by curing at 180°C for 2 hours.

[0031...

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Abstract

The invention belongs to the technical field of composite material preparation, and aims to solve the technical problem that the interface bonding force between an inner core steel bar and an externalcomposite material in the existing SFCB (Steel-Fibre Composites Bar) is insufficient. The technical scheme disclosed by the invention is that a preparation method for the SFCB comprises the followingsteps: first, developing an SFCB perform, namely, taking a steel bar as an axial immovable unit on a three-dimensional weaving machine; enabling fibres to move around the steel bar crisscross in a three-dimensional weaving manner until the steel bar is completely wrapped in the fibres; enabling the cross section of the fibres is not smaller than the cross section of the inner core steel bar, andobtaining the SFCB perform; and second, developing the SFCB, namely, impregnating the SFCB perform in the first step with resin, and curing and forming to obtain the required SFCB. The preparation method for the SFCB has the beneficial effects that the fracture strength and the secondary stiffness are high; and the SFCB has good alkaline resistance.

Description

technical field [0001] The invention belongs to the field of preparation of composite material tendons, and in particular relates to a preparation method of SFCB tendons. Background technique [0002] Steel bars have always been the most mature and widely used reinforcement structure in concrete structures. However, steel bars are prone to corrosion in the alkaline environment of concrete, which eventually leads to the failure of the overall structure. In recent years, fiber reinforced composite (Fiber reinforced composites, FRP) bars have received more and more attention in concrete structures due to their advantages of light weight, high strength, and good corrosion resistance. However, FRP tendons still have disadvantages such as low elastic modulus, high brittleness, and failure without warning. Based on this, scholars at home and abroad proposed to prepare steel-fiber composites bar (SFCB) with high comprehensive performance and relatively low cost by using fiber-wrap...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C70/44B29C70/54B29B11/00B29B11/16
CPCB29B11/00B29B11/16B29C70/443B29C70/54B29K2305/00
Inventor 周寅智周健南金丰年徐迎孔新立陈海龙王鹏陈艺顺
Owner ARMY ENG UNIV OF PLA
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