Mechanical performance of corroded RC member repaired by HPFRCC patching

This paper presents a patch repair method that uses high performance fiber reinforced cement composites (HPFRCCs) to repair reinforced concrete members damaged by chloride attack. The beam specimens were deteriorated under chloride attack and then repaired using HPFRCC shotcreting, before they were loaded to investigate their mechanical performance. The experimental results indicates that even after formation of multiple fine cracks under applied load, the HPFRCC remains impermeable due to its very small crack width. With the proposed repair method, the HPFRCC patch layer allowed only very fine cracks to be formed in service conditions. The strength of a beam deteriorated by rebar corrosion could be recovered using HPFRCC patching if the amount of corrosion was less than 10%. It was also clarified that a combined use of a fiber net with HPFRCC patching improves the dispersibility of fine cracks in the HPFRCC layer.

► We propose a patch repair method that uses HPFRCC to repair deteriorated RC members. ► Under service conditions, the HPFRCC remains impermeable even if they have cracks. ► The strength of beams could be recovered if the corrosion amount was less than 10%. ► A combined use of a fiber net with HPFRCC improves the dispersibility of cracks.