Accurate analysis of transport process of corrosive agents into concrete structures by micropore structural model

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1) Airborne salt reaching on the surfaces of concrete structures could be successfully predicted by numerical transport analysis in which configuration of structure, geography around structure, weather condition and ocean condition are considered.2) It was shown that averaged airborne salt in the time scale of week can be estimated by the numerical analysis in which averaged weather and ocean conditions are considered.3) It was clarified by field measurement that airborne salt reaching on the surface of structures is less than that blown in the air.4) The investigators developed a simple experimental system that simulates the developing process of surface chlorides of concrete subjected by rain and sunshine in the laboratory5) Since diffusion coefficient of chloride ions in surface coating materials for concrete is very small, defects and deterioration of the coating materials themselves maybe significantly decreases their protecting ability. Average diffusion coefficient of surface coating systems including artificial defects were quantified by electrolytic permeability test. It was experimentally verified that average diffusion coefficient can be expressed as a function of degree of defect.