Publication :
Corrosion-damaged RC beams repaired with fabric-reinforced cementitious matrix

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Date
2018-08-02
Auteurs
Ebead, Usama
Nanni, Antonio
Direction de publication
Direction de recherche
Titre de la revue
ISSN de la revue
Titre du volume
Éditeur
American Society of Civil Engineers
Projets de recherche
Structures organisationnelles
Numéro de revue
Résumé
The structural performance of corrosion-damaged reinforced concrete (RC) beams repaired with fabric-reinforced cementitious matrix (FRCM) was investigated. Eleven RC beams were constructed and tested in flexure under four-point load configuration. Nine beams were subjected to an accelerated corrosion process for 70 days to obtain an average mass loss of 13% in the tensile steel reinforcing bars while two other beams were tested as controls. One corroded beam was repaired with carbon fiber-reinforced polymer (CFRP) before testing for comparison. The test parameters included the number of fabric plies (1–4), the FRCM repair scheme (end-anchored and continuous U-wrapped strips), and FRCM materials [carbon and polyparaphenylene benzobisoxazole (PBO)]. Test results showed that corrosion slightly reduced the yield and ultimate strengths of the beams. The use of FRCM increased the ultimate capacity of corroded beams between 5 and 52% and their yield strength between 6 and 22% of those of the uncorroded virgin beam. Beams repaired with U-wrapped FRCM strips showed higher capacity and higher ductility than those repaired with the end-anchored bottom strips having a similar number of layers. A high gain in the flexural capacity and a low ductility index were reported for specimens with a high amount of FRCM layers. A new factor was incorporated in the design equations of the ACI 549.4R-13 to account for the FRCM scheme.
Description
Revue
Journal of composites for construction, Vol. 22 (5), 1-13 (2018)
DOI
10.1061/%28ASCE%29CC.1943-5614.0000873
URL vers la version publiée
Mots-clés
Corrosion , Fabric-reinforced cementitious mortars (FRCM) , Flexure , Reinforced concrete (RC) , Repair , Strengthening
Citation
Type de document
article de recherche