Steel-continuous fiber composite bar and preparation method

A technology of continuous fibers and composite bars, applied in structural elements, building components, buildings, etc., can solve problems such as difficult coordination between steel bars and external FRP, threats to structural safety performance, and insufficient bonding force, so as to improve the collaborative work performance , Facilitate infiltration and simplify the production process

Active Publication Date: 2021-02-05
江苏绿材谷新材料科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, SFCB bars have the problem of insufficient cohesive force at the interface between the inner core steel bar and the outer composite material, which makes it difficult for the steel bar and the outer FRP to bear the force synergistically.
In addition, the strength of commonly used SFCB tendons declines sharply after fiber fracture, which poses a serious threat to the structural safety performance.

Method used

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  • Steel-continuous fiber composite bar and preparation method
  • Steel-continuous fiber composite bar and preparation method
  • Steel-continuous fiber composite bar and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] like figure 1 As shown, the SFCB bar 6 of the present invention includes a steel bar inner core 1, a continuous fiber layer 3 and a bridging layer 4, wherein the bridging layer 4 is wrapped on the steel bar inner core 1, and the steel bar inner core is organically formed by the bridging layer 4 1. The continuous fiber layer 3 forms a stressed whole, and there are reinforcement ribs on the outer surface of the reinforcement.

[0035] A total of 6 groups of SFCB bars 6 with different parameters were prepared. The specific parameter design is shown in Table 3. The preparation method of SFCB bars is as follows:

[0036] (1) Grind the threaded steel bar to the height of the ribs to the predetermined height and perform decontamination treatment. After the preliminary treatment, the mechanical properties of the inner core of the steel bar are shown in Table 1. The inner core steel bar is soaked in the silane coupling agent alcohol solution for 30 minutes, and then dried at ro...

Embodiment 2

[0052] Adopt the preparation method in Example 1 to prepare 3 groups of steel-continuous fiber composite bars, the preparation parameters of the composite bars are consistent with the sample a in Example 1, that is: the volume ratio of continuous fiber bundles to steel bars is 1:4, and the bridging The layer chopped fiber volume fraction was 45%. The design parameters of the outer surface of the reinforcement are shown in Table 5. Self-mixing concrete was used to pour standard pull-out specimens, and the compressive strength of self-mixing concrete was 41.7MPa.

[0053] table 5

[0054]

[0055] After 28 days of curing, pull-out tests were carried out on the three groups of specimens, and the experimental results are summarized in Figure 4 to Figure 6 ,in Figure 4 is the stress-slip comparison diagram of drawn specimens with different rib depths, Figure 5 is the stress-slip comparison diagram of the drawn specimens with different rib spacings, Image 6 It is the str...

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Abstract

The invention discloses a steel-continuous fiber composite bar and a preparation method. The steel-continuous fiber composite bar comprises a steel bar inner core, a continuous fiber layer and steel bar reinforced ribs, wherein the continuous fiber layer is arranged outside the steel bar inner core, the steel bar reinforced ribs are arranged on the outer surface of steel bars, and a bridging layercomposed of chopped fiber and resin is arranged between the steel bar inner core and the continuous fiber layer. The spacing of steel bar reinforced ribs is 1.5 times of the diameter of the bars, therib width is 23% to 25% of the diameter, and the rib depth is 0.07 to 0.08 of the diameter. According to the steel-continuous fiber composite bar, the resin is reinforced by the chopped fiber, the obtained modified resin is used for manufacturing the bridging layer, on one hand, the cooperative work performance of the steel bars and the fiber is improved, and on the other hand, the production efficiency of the bars is improved. The surface form of the bars is optimized, controllable sliding between the composite bar and concrete is achieved, and the breaking risk of the continuous fiber is reduced; and additionally, the volume ratio of the steel bars to the fiber is reasonably designed, so that the secondary rigidity of the composite bar after the steel bars are yielded is guaranteed, thedecline amount of the strength of the steel bars after the fiber is broken is reduced, and the safety performance of the structure is further improved.

Description

technical field [0001] The invention relates to the field of design and preparation of composite bars, in particular to a structural steel-continuous fiber composite bar. Background technique [0002] Reinforced concrete is the most widely used and most mature building material in application engineering. However, steel bars have the disadvantage of being easy to corrode. After corrosion, the bearing capacity of steel bars decreases, resulting in structural failure. This not only shortens the service life of the structure, but also increases the maintenance costs of the building. FRP (Fiber Reinforced Polymer) is an emerging material at the end of the last century, which has the advantages of light weight, high strength and corrosion resistance. However, due to the shortcomings of low elastic modulus and brittle failure, the use of FRP bars in the construction industry is greatly restricted. [0003] Steel-Fiber Composite Bar (Steel-Fiber Composites Bar, SFCB) is a new ty...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E04C5/07B29C53/60B29C53/80B29C70/52
CPCE04C5/07B29C53/60B29C53/8066B29C70/521
Inventor 吴智深汪昕陈志远魏星朱中国
Owner 江苏绿材谷新材料科技发展有限公司
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