Preparation method of test piece for testing electrochemical performance of reinforcing steel bar in CFRP repaired cracked concrete

Abstract

The invention discloses a preparation method of a test piece for testing electrochemical performance of reinforcing steel bars in CFRP repaired cracked concrete. The method comprises the following steps: pouring a steel bar-containing concrete cylinder test piece by simulated seawater; simulating seawater maintenance of the test piece and electrifying to accelerate corrosion of steel bars in the test piece; after electrifying is finished, enabling the test piece to be subjected to seawater dry-wet cycle simulation and electrochemical performance testing of reinforcing steel bars in the test piece, and including open-circuit potential and polarization curves; after five dry-wet cycles, carrying out anti-corrosion treatment on the steel bars in the steel bars; and wrapping the cylindrical test piece with CFRP, and carrying out dry-wet cycle and electrochemical performance test again so as to evaluate the influence of anti-corrosion treatment of the reinforcing steel bars and CFRP wrapping on the corrosion state of the reinforcing steel bars in the reinforcing steel bars before the CFRP repairs the rust expansion cracking reinforced concrete. The invention provides the preparation method of the test piece for testing the electrochemical performance of the reinforcing steel bar in the CFRP repaired cracked concrete, and the preparation method has important significance for researching the durability of the reinforced concrete member repaired by the CFRP.

Description

technical field [0001] The invention relates to the field of seaside reinforced concrete engineering construction, in particular to a method for preparing a specimen for testing the electrochemical performance of steel bars in cracked concrete repaired by CFRP. Background technique [0002] For offshore buildings, corrosion of steel bars caused by chloride ions is the main cause of damage to reinforced concrete structures. In the splash zone, due to the dry-wet cycle caused by ocean tides, the corrosion of steel bars caused by chloride ions in reinforced concrete structures is more serious. [0003] Carbon Fiber Reinforced Polymers (CFRP for short) have been widely used in repairing offshore reinforced concrete structures due to their excellent mechanical properties and corrosion resistance. Most of the current research focuses on the mechanical properties of the repaired reinforced concrete members, and there are few studies on the corrosion state of the steel bars in the ...

AI Technical Summary

Problems solved by technology

However, in the state of reinforced concrete members, the concrete is rusted and cracked, and the steel bars have been corroded. If the seawater dry-wet cycle is used, it takes a long time; therefore, this patent provides a preparation for testing the electrochemical performance of the steel bars in the cracked concrete repaired by CFRP. method, which can be used to study the effect of CFRP wrapping on the corrosion resistance of steel bars in reinforced concrete members with rust swelling and cracking of concrete and corroded steel bars

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