STUDY ON ELECTROCHEMICAL REHABILITATION METHOD USING HPFRCC CONTAINING LITHIUM SALT

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  • リチウム含有HPFRCCを陽極システムに用いた電気化学的リハビリテーション手法に関する研究

Abstract

Electrochemical corrosion control methods have been applied to concrete structures deteriorated by steel corrosion in concrete due to chloride attack or carbonation of concrete. However, if such structures contain reactive aggregates that can occur ASR, the application of electrochemical corrosion control method could promote the concrete expansion due to ASR because alkali metallic ions such as Na＋ or K＋ can be drawn toward the steel and accumulated around the steel in concrete. Then it is difficult to determine an effective countermeasure against structures damaged by complex deterioration of chloride attack and ASR.<br/>From these backgrounds, experimental investigation was carried out in order to clarify the possibility of a new electrochemical rehabilitation method using bonded anode layer of the high performance fiber reinforced cementitious composite（HPFRCC）containing lithium salt that has ASR suppression effect. HPFRCC is cementitious material mixed with organic short fibers and can realize the apparent tensile ductility similar with metalic materials. As the results of this study, in addition to the conventional protection effect against steel corrosion, penetration of Li＋ from HPFRCC anode layer to concrete inside was observed. However, adhesive strength between HPFRCC anode layer and concrete surface was reduced due to the electrochemical treatment if HPFRCC contains lithium salt.

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