Magnesium　phosphate　cement　(MPC)　is　used　as　an　adhesive　that　bonds　carbon　fiber　reinforced　plastic　sheet　(CFRP　sheet-Cs)　and　mesh　(CFRP　mesh-Cm)　in　formation　of　the　MPC-CFRP　composite　material.　This　type　of　MPC-CFRP　composite　material　can　serve　as　both　an　anode,　Cs　and　Cm　electrodes,　for　extracting　chloride　ions　and　a　reinforcement　material　for　concrete　columns,　and　it　contributes　to　bearing　capacity　improvement　and　electrochemical　chloride　extraction　(ECE)　of　concrete　structures.　Compared　with　the　traditional　Ti-RuO2　anode　(T　electrode),　the　MPC-CFRP　composite　material　is　used　to　strengthen　concrete　columns　and　extract　chloride　ions.　Current　density,　i　=　4,　8　A/m(2),　and　power-on　time,　t　=　14,　28,　42　d,　are　considered　to　illuminate　the　effect　of　the　ECE　system　on　the　axial　compressive　strength,　chloride　ion　concentration　and　bond　strength　of　the　rebar-concrete　interface　of　concrete　columns.　Cs　and　Cm　electrodes　can　be　used　as　anodes　of　the　ECE　system　to　migrate　chloride　ions　near　the　rebar　effectively　toward　the　concrete　surface.　The　increase　of　power-on　time　and　current　density　improves　the　chloride　extraction　efficiency.　Cs　electrode　has　similar　chloride　extraction　efficiency　as　T　electrode　under　the　same　experimental　condition　superior　to　Cm　electrode.　The　bond　strength　of　the　rebar-concrete　interface　degrades　after　ECE　and　the　degradation　increases　as　the　current　density　and　power-on　time　increases.　Cs　and　Cm　electrodes　significantly　improves　the　bearing　capacity　and　ultimate　displacement　of　concrete　columns.　However,　the　strengthening　effect　decreases　as　the　current　density　and　power-on　time　increases.　The　mechanical　properties　of　the　strengthened　concrete　columns　are　still　superior　than　those　of　the　un-strengthened.　Cs　and　Cm　electrodes　can　achieve　the　dual　effects　of　reinforcing　and　repairing　reinforced　concrete　structures.　The　estimated　equations　of　ECE　efficiency　and　ultimate　load　of　concrete　columns　agree　with　the　test　data.　(C)　2017　Elsevier　Ltd.　All　rights　reserved.