Multiwalled carbon nanotube-modified epoxy resin production and FRP-concrete bonding monitoring methods

Abstract

The invention discloses a multiwalled carbon nanotube-modified epoxy resin production method. The method comprises the following steps of (1) producing materials of epoxy resin, a curing agent, multiwalled carbon nanotubes and acetone; (2) adopting environment temperature for heating the epoxy resin to 40 DEG C to improve the mobility of the epoxy resin; (3) dispersing the multiwalled carbon nanotubes into the acetone; (4) mixing the dispersed multiwalled carbon nanotubes and the heated epoxy resin according to a mass ratio of the dispersed multiwalled carbon nanotubes to the heated epoxy resin of 0.5%-3.0%, and volatilzing the acetone after evenly stirring a mixture; and (5) adding the curing agent according to a corresponding ratio, and stirring a mixture evenly to form multiwalled carbon nanotube-modified epoxy resin. The multiwalled carbon nanotube-modified epoxy resin production method has the advantages that the multiwalled carbon nanotube-modified resin is adopted, based on electrical conductivity analysis of the carbon nanotube-modified resin, FRP-concrete interface bonding defects and damage are monitored in real time, meanwhile, interface bonding force of a bonding layerand concrete is enhanced, operation is simple, and construction is convenient, so that the multiwalled carbon nanotube-modified epoxy resin production method is suitable for application and popularization.

Description

Technical field [0001] The invention relates to a method for preparing multi-wall carbon nanotube modified epoxy resin and monitoring FRP-concrete bonding, and belongs to the technical field of concrete. Background technique [0002] Reinforced concrete structures under early construction or severe service environments have suffered varying degrees of damage and cracking. Fiber composite materials (FRP) have high specific strength (the ratio of strength to weight), good corrosion resistance, excellent fatigue resistance, and electrical insulation. With the advantages of good performance and convenient construction, FRP has been widely used as a reinforcement material to strengthen concrete structures. [0003] The FRP material is pasted on the concrete surface through an adhesive to achieve the purpose of FRP material to strengthen the concrete structure. The key of FRP-concrete structure technology is to ensure good force transmission between FRP material and concrete structure. ...

AI Technical Summary

Problems solved by technology

Considering that the elongation at break of FRP material is small and the deformation of FRP-concrete structure is small, it is difficult to evaluate the service performance of the structure from the macro level, and there is no reliable means to monitor the damage and peeling process of the adhesive layer-concrete interface in real time.

[0004] In order to prevent the peeling of the FRP-concrete interface, the existing method is to increase the anchorage and prevent the penetration of water molecules through the end of the FRP, but the effect is not very good

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