Method for establishing existing concrete chloride ion erosion life prediction model

Abstract

The invention relates to the field of nuclear power plant concrete structure evaluation, in particular to a method for establishing an existing concrete chloride ion erosion life prediction model. Existing concrete indoor durability test parameters mostly adopt test parameters commonly used in the industry, the test is suitable for measuring the durability of different concrete materials when the concrete materials are selected in an engineering design stage, while for an existing concrete structure of a nuclear power plant, the material parameters are determined, and at present, there is a lack of methods for predicting the expected life of the existing concrete structure based on the current situation of the concrete structure. The method comprises the following steps: 1, carrying out condition investigation; 2, designing an experimental environment; step 3, performing experiment; step 4, performing verification. The invention provides a method for carrying out a chloride ion accelerated erosion test on a concrete sample based on a similarity theory and predicting the life expectancy of an existing structure according to a test result.

Description

technical field [0001] The invention relates to the field of nuclear power plant concrete structure evaluation, in particular to a method for establishing an existing concrete chloride ion erosion life prediction model. Background technique [0002] Reinforced concrete structure is the most widely used structure in nuclear power plants. my country's nuclear power plants are located in coastal areas. The marine erosive environment in coastal areas will lead to premature chlorine salt erosion, sulfate erosion, and atmospheric carbonation of reinforced concrete in nuclear power plant structures. , which in turn leads to aging problems such as cracking and peeling of concrete, corrosion and swelling of steel bars, hollowing and peeling of coatings, etc., which poses a serious threat to the durability (supporting capacity and containment capacity) of structures, and even threatens the safe operation of nuclear power plants. In recent years, as domestic nuclear power plants pay mor...

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Problems solved by technology

[0005] In order to overcome the problem that there is no method to predict the life expectancy of existing concrete structures based on the current situation of concrete structures, the present invention proposes a method based on similarity theory to conduct chloride ion accelerated erosion tests on concrete samples, and predict the existing life expectancy based on the test results. Methodology for Structural Life Expectancy

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