NON-DESTRUCTIVE EVALUATION OF PERMEABILITY OF COVER CONCRETE BY PROPERTIES OF SURFACE COLOR CHANGE AND WATER FLOW OCCURRED BY WATER SPRAYING

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  • NISHIO Sohei
    RAILWAY TECHNICAL RESEARCH INSTITUTE, Materials Technology Division
  • UEDA Hiroshi
    RAILWAY TECHNICAL RESEARCH INSTITUTE, Materials Technology Division
  • KISHI Toshiharu
    THE UNIVERSITY OF TOKYO, Institute of Industrial Science

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Other Title
  • コンクリート表面における散水時の明度変化特性および水の流下特性による表層品質の非破壊評価

Abstract

The permeability of cover concrete has considerable effect on the durability of reinforced concrete structures, and the importance of the non-destructive evaluation on the mass transfer resistance of cover concrete has become increasingly important in recent years. In this study, the authors proposed an evaluation method which is simple and easily applicable to the inspection of concrete structures, by focusing on the change of surface color of concrete in wet condition and the water flow phenomenon on vertical plane. As a result, it was clarified that the change over time of the brightness and the flow length of water that caused by the water spraying have different characteristics according to the concrete qualities. Based on these results, several indicators obtained by the proposed method have a potential to be available for simple evaluation of the surface mass transfer resistance.

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