open access

https://hdl.handle.net/2115/100472

Experimental investigation on rehabilitation effectiveness of locally corroded RC slabs using external CFRP strip plates

英語

spot-welded wire mesh (WWM)

2026-07-01

Proceedings of the 10th International Symposium on Reliability Engineering and Risk Management (ISRERM 2026)

This work aims to investigate the rehabilitation effectiveness on the loading resistance of a locally-corroded RC slab using experimental testing. The experimental program comprised seven scaled one-way RC slabs, including one uncorroded and six corroded, and nine two-way RC slabs, including one uncorroded and eight corroded specimens. The corroded RC slabs were retrofitted using CFRP strip plates (CFRP-p), CFRP sheets (CFRP-s), and spot-welded wire mesh (WWM). Besides the retrofit work in the rehabilitation, this work adopts non-shrinkage cement mortar and lightweight epoxy mortar to do the patch repair of the corroded regions. After the patch repair and retrofit, monotonic loading tests are conducted to investigate the mechanical behavior of RC slabs, focusing on the application of CFRP-p, which offer greater convenience than CFRP-s and WWM in site construction. The slab specimens are locally-corroded using the electrical-chemical method. According to the test results, compared with CFRP-s and WWM, CFRP-p provide superior improvements in load-carrying capacity while reducing deformation and crack width. CFRP-p is also demonstrated to be an effective strengthening solution for restoring the stiffness of corrosion-damaged one-way and two-way RC slabs under serviceability conditions. Localized corrosion significantly reduces stiffness and flexural capacity while increasing ductility due to reinforcement ratio loss. A modified ACI 440.2R based design equation accounting for localized corrosion is proposed to determine CFRP-p dimensions and restore only the lost structural capacity.

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