PREDICTION OF REINFORCING BAR CORROSION IN CONCRETE MANHOLES FOR INFORMATION NETWORK BASED ON DETAILED ASSESSMENT OF INTERNAL HYDROTHERMAL CONDITIONS

Abstract

 A prediction method for reinforcing bar corrosion in concrete was developed to assure efficient maintenance of concrete manholes for information network. An equation for corrosion rate of reinforcement in concrete of manholes was proposed, which took into account the effect of moisture content of concrete, temperature and supply of oxygen to reinforcement. Corrosion of reinforcement of manholes under various conditions were calculated as a function of time based on prediction results of hydrothermal condition in manhole by integrated heat transfer analysis of soil and structure. It was verified that tendencies of deterioration process of manholes due to reinforcement corrosion in various region in Japan can be predicted considering differences in regional climatic conditions.