Carbon fabric-reinforced cementitious mortar composites for rehabilitation of continuous concrete beams with corroded reinforcement of various severity

Abstract

Test results of 14 continuous concrete beams with corroded reinforcement of various severity are reported. Six corroded beams were tested to failure without repair. Carbon fabric-reinforced cementitious mortar (C-FRCM) repair solutions were applied to seven corroded beams. One virgin beam was used as a benchmark. Continuous beams with 20–40% sagging corrosion experienced 9–15% reductions in their load capacity. The beams with hogging corrosion experienced a maximum strength reduction of 9%. The C-FRCM repair solutions were successful in upgrading the response of the corroded beams. The corroded-repaired beams, except one, experienced a ductility index comparable to or higher than that of the virgin beam. The C-FRCM repair delayed yielding of the corroded steel and reduced the moments transfer after the occurrence of the first yielding. A simplified analytical model capable of predicting the load capacity of the tested beams was introduced and verified against the experimental results.

Keywords

• Concrete
• Continuous
• Corrosion
• Flexure
• FRCM
• Hogging