Experimental method for corrosion resistance of steel bar used in concrete structure in tropical marine atmospheric environment

Abstract

The invention provides an experimental method for corrosion resistance of a steel bar used in a concrete structure in a tropical marine atmospheric environment. The method comprises the following steps of: counting and analyzing climatic and environmental conditions and changing laws of coastal areas of Thailand, establishing a load spectrum of environmental corrosion parameters; formulating various concrete proportions and concrete thickness, designing different experimental schemes, preferably setting a concrete proportion and determining the concrete thickness according to the load spectrumof the environmental corrosion parameters, and designing a mold according to the size of a steel bar sample and the concrete thickness; fixing the steel bar sample inside the mold, pouring the concrete slurry into the mold, and removing the mold after the slurry is solidified to obtain a reinforced concrete sample; and fixing the reinforced concrete sample to a sample holder for outdoor atmospheric exposure test, and evaluating the corrosion resistance of the steel bar sample by analyzing corrosion kinetics and macroscopic morphology of the steel bar sample in different sampling periods. According to the experimental method for the corrosion resistance of the steel bar used in the concrete structure in the tropical marine atmospheric environment, the corrosion resistance of the steel barcan be evaluated in a short period of time, the steel bar with good corrosion resistance are preferred.

Description

technical field [0001] The invention belongs to the technical field of the corrosion process of reinforced concrete in the atmosphere, and in particular relates to an experimental method for the corrosion resistance of steel bars used in concrete structures in tropical marine atmospheric environments. Background technique [0002] The tropical marine atmospheric environment has the characteristics of high humidity, high temperature, high chloride ion content, and high radiation. It is an extremely severe and corrosive environment, and the requirements for the corrosion resistance of infrastructure steel and protective measures are particularly strict. In recent years, my country has built a certain number of reinforced concrete structures in tropical marine and atmospheric regions. However, in the process of using these buildings, it was found that the buildings did not reach the design service life but suffered structural damage and durability failure. The reasons are, on t...

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Problems solved by technology

These patents can simulate corrosion in the natural environment, but there are still certain disadvantages, such as: the indoor experimental parameters do not completely simulate the environmental factors of atmospheric corrosion, and there is a large deviation from the actual situation on site; the research results can only be used as a relative corrosion resistance However, it cannot clearly reflect the actual service conditions of materials in the natural environment; the atmospheric environment is complex and diverse, and the sensitivity of various materials to environmental factor corrosion is different.

The natural exposure test method is to place the steel bar sample directly in the atmospheric environment, which can truly reflect the corrosion status of the service site, but the steel bar is not covered by concrete and cannot truly reflect the corrosion status of the steel bar in the concrete, and the field exposure test cycle is very short. Long, on-site evaluation is time-consuming and laborious, at least 3 to 5 years, unable to meet the urgent needs of technology and production, and the efficiency of scientific research is low

[0004] Based on the above reasons, it is necessary to further optimize the evaluation method for the corrosion resistance of steel bars used in concrete structures, in order to solve the problems caused by the deviation of the indoor simulation test results and the long period of the field exposure test.

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