Prehension of actual quality of cover concrete by field survey and high level integration between durability design and inspection

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It is pointed out that it is important to conduct direct inspection on surface quality of cover concrete in order to assure the effectiveness of durability design for structures. It is also found that chloride ion ingress into concrete does not necessarily follow the fick’s difussion law and is often stagnated at certain position in depth. It is also proved by a series of optical experiments using micro-nano combined glass chip that the electric double layer blocks difusion of chloride ion in micro pores of concrete in unsaturated deeper zone.