Shunsuke SATO
Study on Prediction of Local Chloride Attack Progress by Antifreezing Agent Dispersal of Concrete Structures
Takumi SHIMOMURA
In snowy cold region, antifreezing agent is often sparged on the road to prevent freezing in winter. Many chloride attack cases of concrete structure which is set up in the mountain area are reported. It”Ēs important to consider accurately the moisture transportation and chloride penetration area or amount into the structure to estimate chloride attack degradation level inside structures.
In this research, a way of reproduction by numerical analysis of moisture transportation model on the surface of structure and chloride seepage model into concrete involved moisture transportation was considered.
Moisture transportation analysis of laboratory experiment results and research estimates of deteriorated structure by chloride attack was performed. In laboratory experiment, drainpipe degradation current on bridge pier was re-enacted. Repeatability of leaked water trace by moisture transportation analysis was confirmed. In analysis intended for research estimates of deteriorated structure, the numerical analysis of leaked water trace from degenerated drainpipe on bridge pier was performed. As result, the flux current was re-enact by fixing parameter obtained from laboratory experiment. However, water trace more increasing than expected wad confirmed, and it was need to deal with seepage analysis into structure confirmed moisture transportation on the surface.
Seepage analysis of moisture and chloride of structures which have degenerated drainpipe was performed. The session of analysis was 10 years because it is assumed period after antifreezing agent dispersal. Repeatability of increase of chloride seepage inside structure was confirmed from leaked water trace area on the surface. In structure measured high chloride concentration on surface, risk that surpass limit of appearing corrosion inside the structure was confirmed. As above, approximate estimation of chloride attack degradation level inside structure according to leaked water trace on surface was made possible by moisture transportation analysis and seepage analysis.
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