Method and system for preparing steel strand-FRP composite bar

A technology of steel strands and composite bars, used in manufacturing tools, heat treatment equipment, coatings, etc., can solve the problems of acid corrosion, do not allow cracks, damage, etc., to meet the requirements of high temperature environment, prevent resin leakage, and protect a wide range of Effect

Pending Publication Date: 2021-07-23
山东联新建筑科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, during the service period, steel products are prone to oxidation, carbonization, acid corrosion and other damages, while steel strands are often used in prestressed and other structures, and cracks are not allowed
[0003] Due to its light weight, high strength and good corrosion resistance, fiber reinforced composites (FRP) are widely used in the construction industry. The method of replacing steel bars with FRP bars as stress bars has also been widely used, but compared with Traditional steel bars and FRP bars have no obvious yield phenomenon, are brittle, and there is no warning of failure, so it is difficult to meet actual needs

Method used

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  • Method and system for preparing steel strand-FRP composite bar
  • Method and system for preparing steel strand-FRP composite bar
  • Method and system for preparing steel strand-FRP composite bar

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[0027] The invention provides a kind of preparation method of steel strand-FRP composite reinforcement, comprises the following steps:

[0028] Stranding the steel wires to obtain steel strands;

[0029] placing the steel strand in a resin solution and impregnating it to obtain a resin-coated steel strand;

[0030] FRP fiber bundles are wrapped on the surface of the resin-coated steel strands, followed by heating and curing and cooling and shrinking to obtain steel strand-FRP composite bars.

[0031] In the present invention, unless otherwise specified, the raw materials used are commercially available products well known to those skilled in the art.

[0032] The invention twists the steel wires to obtain steel strands. In the present invention, the steel wire is preferably a scored steel wire. In the present invention, the diameter of the steel wire is preferably 2.5-6 mm; the strength is preferably 1570 MPa and above.

[0033] In the present invention, the preparation me...

Embodiment 1

[0062] use as figure 2 The shown process flow chart prepares steel strand-FRP composite bars:

[0063] Select a scored steel wire with a diameter of 5mm, soak the untreated steel wire in an aqueous hydrogen peroxide solution with a mass fraction of 15%, control the temperature at 25°C, stir slowly during soaking, and soak for 45 minutes. Stop soaking when bubbles appear, and after soaking, dry the steel wire naturally at room temperature until there is no moisture on the surface to obtain the pretreated steel wire;

[0064] Put the pretreated steel wire in a muffle furnace, raise the temperature from room temperature to 450°C at a rate of 8°C / min, then rise to 850°C at a rate of 12°C / min, and keep it warm for 1min; after treatment, Cool to room temperature to obtain a stabilized steel wire;

[0065] The stabilized steel wire is subjected to cold-drawing monofilament to obtain a cold-drawn steel wire; the drawing speed of the cold-drawn monofilament is 50mm / min, and the cold...

Embodiment 2

[0076] Select a scored steel wire with a diameter of 5mm, soak the untreated steel wire in an aqueous hydrogen peroxide solution with a mass fraction of 15%, control the temperature at 25°C, stir slowly during soaking, and soak for 45 minutes. Stop soaking when bubbles appear, and after soaking, dry the steel wire naturally at room temperature until there is no moisture on the surface to obtain the pretreated steel wire;

[0077] Place the pretreated steel wire in a muffle furnace, raise the temperature from room temperature to 430°C at a rate of 6°C / min, then rise to 830°C at a rate of 12°C / min, and keep it warm for 1min; after treatment, Cool to room temperature to obtain a stabilized steel wire;

[0078] The stabilized steel wire is subjected to cold-drawing monofilament to obtain a cold-drawn steel wire; the drawing speed of the cold-drawn monofilament is 60mm / min, and the cold drawing rate is 1%;

[0079] The three cold-drawn steel wires as Figure 4 The arrangement sho...

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Abstract

The invention provides a method and system for preparing a steel strand-FRP composite bar, and relates to the technical field of composite material preparation. The method for preparing the steel strand-FRP composite bar, provided by the invention, comprises the following steps of twisting steel wires to obtain a steel strand; soaking the steel strand in a resin solution to obtain a resin-coated steel strand; and wrapping the surface of the resin-coated steel strand with an FRP fiber bundle, and performing heating curing and cooling tightening in sequence to obtain the steel strand-FRP composite bar. The steel strand-FRP composite bar prepared by the method can prevent the steel strand from being subjected to carbonization, oxidation and acid corrosion, and has higher high temperature resistance and mechanical property.

Description

technical field [0001] The invention relates to the technical field of composite material preparation, in particular to a method for preparing steel strand-FRP composite bars and a system for preparing steel strand-FRP composite bars. Background technique [0002] Steel strand refers to a steel product composed of multiple steel wires. Due to its high strength, large elastic modulus, good torsion resistance, anti-slip performance, and convenient transportation and installation, the steel strand is widely used in bridges, buildings, Water conservancy, energy and geotechnical engineering. However, steel products are prone to oxidation, carbonization, acid corrosion and other damages during their service, and steel strands are often used in prestressed structures, which do not allow cracks to occur. [0003] Due to its light weight, high strength and good corrosion resistance, fiber reinforced composites (FRP) are widely used in the construction industry. The method of replaci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D07B1/16D07B1/06C23C26/00C21D9/52C21D8/06C21D1/78
CPCC21D1/78C21D8/065C21D9/525C23C26/00D07B1/068D07B1/162D07B2205/30D07B2205/3003D07B2205/3007D07B2205/3025D07B2801/10
Inventor 周新文王伟张振华
Owner 山东联新建筑科技有限公司
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