【摘 要】
：
The penetration of aggressive substances into concrete is the primary cause of concrete and reinforcement degradation, which affects the concrete durability
【机 构】
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School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640,
【出 处】
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The 14th International Congress on the Chemistry of Cement (
论文部分内容阅读
The penetration of aggressive substances into concrete is the primary cause of concrete and reinforcement degradation, which affects the concrete durability greatly.For structures in marine environment, chlorides are the most critical environmental factors, causing serious steel corrosion and damage the concrete structures.For concrete structures exposed to chlorides, corrosion happens once the chloride concentration at the steel surface reached a critical point.The influence of flexural load on chloride diffusion and microscopic structure of concrete and hardened paste were investigated, as well as the affecting mechanism of flexural load on microscopic structure.The results showed that the maximum chloride concentration among the pure bending section in concrete appeared at about 2 mm depth, and flexural load accelerated the penetration of chloride ions in concrete.There was a significant correlation between the flexural load levels and the constant load factor when expressed in an exponential function, for the typical high performance concrete mix.It should consider the influences of flexural loads on chloride diffusion coefficient in durability design of concrete structures.
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