Experimental method for corrosion resistance of steel bars for concrete structures in tropical marine atmospheric environments

Abstract

The invention provides an experimental method for the corrosion resistance of steel bars used in concrete structures in tropical marine atmospheric environments. The method includes: counting and analyzing climate and environmental conditions and changing laws in coastal areas of Thailand, and establishing environmental corrosion parameter load spectrums; according to environmental corrosion parameter load spectra, Draft a variety of concrete ratios and concrete thicknesses, design different experimental plans, optimize a set of concrete ratios and determine the concrete thickness, and design the mold according to the size of the steel sample and the thickness of the concrete; the steel sample is fixed inside the mold, and the concrete slurry After pouring in, the formwork was removed after the slurry was solidified, and the reinforced concrete samples were obtained; the reinforced concrete samples were fixed on the sample rack for outdoor atmospheric exposure experiments, and the corrosion kinetics and macroscopic morphology of the steel samples were analyzed by analyzing the corrosion kinetics of different sampling periods. The corrosion resistance performance of steel bar samples was evaluated. This method can evaluate the corrosion resistance of steel bars in a short period of time, so as to optimize the steel bars with good corrosion resistance.

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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