1 State Key Laboratory of High Performance Civil Engineering Materials,Jiangsu Research Institute of Building Science,Nanjing 210008,China 2 Jiangsu Sobute New Materials Co.,Ltd.,Nanjing 211103,China 3 School of Materials Science and Engineering,Southeast University,Nanjing 211189,China
Abstract: In the early 1920s, with the development of design theory and construction technology, reinforced concrete began to be widely used in infrastructure construction. Reinforced concrete combined the advantages of both steel and concrete—strong and durable. However, the impact of environmental factors was underestimated and a huge price was paid for it. Environmental factors such as chloride ion, carbonization, freeze-thaw, sulfate, chemical erosion and so on can lead to deterioration of reinforced concrete durability. Amongst, chloride induced steel corrosion is the most prominent in all durability problems. In air or water, chloride ion can penetrate the protective layer of concrete and reach the reinforcing bar's surface, causing corrosion. A large number of theoretical and experimental studies focused on describing chloride ion penetration through concrete, and achieved considerable results. However,the in-service reinforced concrete bears load all the time, complex stress state causes the internal meso-structure change of concrete materials, and affects or even changes the diffusion behavior of chloride, the above study of chloride ion diffusion neglecting the load factors, which makes it difficult to transform the above research results from laboratory to practical engineering. In addition, the chloride ion diffusion behavior is also related to the cumulative damage of stress history. Therefore, in recent years, more and more attention has been paid to the durability study about the coupling of load and chloride ion, and it has become an indispensable part of major engineering projects. According to the load state in practical projects, researchers have developed a large number of coupling test methods and devices. The relative mature ones are uniaxial tension, uniaxial compression and static bending, coupled with chloride respectively. However, different experimental details used by different researchers lead to incomparable experimental results. Besides, some researchers have explored more complex coupling factors (splitting tension, eccentric compression, fatigue bending, static shear coupled with chloride respectively). Complex coupling factors are more similar with the practical projects, and are also the trend of recent research, but they are still in the initial stage. In this paper, the test methods of chlorideion corrosion resistance of concrete under tension, compression, bending and shear loads are summarized. The existing problems are discussed, suggestions for improvement and directions for further study are put forward, in order to provide reference for formulating unified and standardized coupling durability test methods and devices.
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