ELECTROCHEMICAL CHLORIDE EXTRACTION OF A BEAM POLLUTED BY CHLORIDES AFTER 40 YEARS IN THE SEA
A reinforced concrete beam element,casted in 1960s while the construction of theRance dam,has been naturally polluted by chlorides after 40 years of a marine tidal exposure.The electrochemical chloride extraction treatment (ECE) has been used in order to rehabilitatethe beam. The efficiency of the ECE treatment and its durability was studied based on theanalysis made before treatment,2 months after treatment and after 17 months of immersion ofthe beam in a salted pond. The chloride concentration profiles show that free chlorides areextracted with an efficiency of 70％ close to the steel,50％ in the intermediate cover and 5％at the concrete surface and that there is no redistribution of the chlorides after 17 months.From the electrochemical characterizations,the steel potential values can,somehow,indicatea slow down of the rebar corrosion probability,but,this phenomenon is not confirmed by thecorrosion current values. SEM and EDX results show that after the treatment,the concreteclose to the steel contains less Friedelsalt and that the shape of the rust has changed.
reinforced concrete chloride extraction corrosion SEM
Véronique BOUTEILLER Yun Yun TONG
Univérsite Paris Est,LCPC,58,Bd Lefebvre,75732 Paris Cedex 15,France
国际会议
The International Conference on Durability of Concrete Structures(2008年混凝土结构耐久性国际学术会议)
杭州
英文
1278-1284
2008-11-01（万方平台首次上网日期，不代表论文的发表时间）