Abstract
This paper chose the south-east coastal salt-fog area Shantou to carry out the experiment study on chloride ion content of concrete structure, through the chloride ion content field test on reinforced concrete structure in Shantou, respectively for the slat-fog atmosphere zone and the splash zone in marine environment, discuss the corrosion by chloride ion of long-time existing concrete structure.And then measure the chloride ion content of concrete cover in different depth, and determine the chloride ion diffusion model in different conditions concrete through comparative analysis.The result of study, can be used in directing the selection of design scheme for building in planning, and also it will help predict the corrosion time of reinforcement inside the concrete on different positions for existing structure.
Highlights
The monthly average value of the salt-fog amount in south-eastern area of China is between 0.1069 and 0.7425mg/m2, while the annual average value is between 0.148 and 0.480mg/m2
The chlorine ion concentration of reinforced concrete structure at each depth is proportional to the service time, with the extension of structure service time, the total chlorine ion concentration continuously increasing, but the increase rate became slowly as time, chloride ion concentration gradually become stable
Due to the concrete chloride ion concentration differ with depth, and increase with the extend of corrosion time, in this experiment, the chlorine ion diffusion model of concrete follow the Fick's second law
Summary
The monthly average value of the salt-fog amount in south-eastern area of China is between 0.1069 and 0.7425mg/m2, while the annual average value is between 0.148 and 0.480mg/m2. On account of a large number of huge concrete infrastructures, such as port, substation, sea-crossing bridge and so on, were built in coastal areas, the erosion of chlorine ion in the marine environment work on concrete structures is more gravity. That would directly led structures destruction and performance degradation of coastal reinforced concrete(Fig.[1]). Enough attention should be caught for the chloride ion concentration of concrete structure at coastal salt-fog areas. It is very significant for the research
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