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A kind of steel-continuous fiber composite bar and its preparation method

A technology of continuous fibers and composite bars, applied in building components, structural elements, 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 , improve the connection performance, improve the effect of bonding performance

Active Publication Date: 2022-04-15
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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  • A kind of steel-continuous fiber composite bar and its preparation method
  • A kind of steel-continuous fiber composite bar and its preparation method
  • A kind of steel-continuous fiber composite bar and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Such as 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...

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 thereof, wherein the steel-continuous fiber composite bar includes a steel bar inner core, a continuous fiber layer arranged outside the steel bar inner core, and bar ribs on the outer surface of the bar. A bridging layer composed of chopped fibers and resin is arranged between the steel bar inner core and the continuous fiber layer. The rib spacing of the reinforcement is 1.5 times the diameter of the reinforcement, the rib width is 23%-25% of the diameter, and the rib depth is 0.07-0.08 of the diameter. The invention uses the chopped fiber reinforced resin, and uses the obtained modified resin to make the bridging layer. On the one hand, the cooperative performance of the steel bar and the fiber is improved, and on the other hand, the production efficiency of the bar is improved. The surface shape of the reinforcement is optimized, the controllable slip between the composite reinforcement and the concrete is realized, and the risk of fracture of the continuous fiber is reduced; at the same time, the reasonable volume ratio of the reinforcement to the fiber is designed to ensure the composite reinforcement after the reinforcement yields. The secondary rigidity also reduces the amount of decline in the strength of the reinforcement after the fiber breaks, further improving the safety performance of the structure.

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 Patents(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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