Stainless steel-FRCM system for strengthening of RC beams: towards a sustainable strengthening technique
Fabric-Reinforced Cementitious Matrix (FRCM) systems for strengthening concrete structures are an alternative to traditional techniques. The FRCM system is a composite material consisting of two or more layers of cement-based matrix reinforced with dry fibres in the form of open mesh or fabric. When...
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| Format: | Article |
| Language: | English |
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CTU Central Library
2022-03-01
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| Series: | Acta Polytechnica CTU Proceedings |
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| Online Access: | https://ojs.cvut.cz/ojs/index.php/APP/article/view/7974 |
| _version_ | 1818059355616968704 |
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| author | Francesco Bencardino Mattia Nisticò |
| author_facet | Francesco Bencardino Mattia Nisticò |
| author_sort | Francesco Bencardino |
| collection | DOAJ |
| description | Fabric-Reinforced Cementitious Matrix (FRCM) systems for strengthening concrete structures are an alternative to traditional techniques. The FRCM system is a composite material consisting of two or more layers of cement-based matrix reinforced with dry fibres in the form of open mesh or fabric. When adhered to concrete structural members the FRCM system acts as supplemental external reinforcement. Many existing Reinforced Concrete (RC) members exhibit degradation due to the carbonation of concrete and/or corrosion of internal reinforcing steel bars. These RC members can be strengthened using stainless steel, in strip format (unidirectional fibres), embedded in a cementitious based matrix. The system, named Stainless Steel-FRCM, can be applied according to the Externally Bonded (EB) technique. In order to reduce times and costs of intervention, number of used materials, as well as the amount of chemical compounds, a novel Inhibiting-Repairing-Strengthening (IRS) technique is proposed and experimentally tested. Using a suitable matrix (thixotropic mortar with passivation properties) the main three operations of steel bars corrosion inhibition/protection, restoring of deteriorated concrete, and installation of the external strengthening can be carried out in one-step. For evaluating the effectiveness of both new strengthening system and installation technique an extensive experimental investigation was planned and developed. A part of the experimental research includes two groups of three RC beams (3.00 m and 4.80 m long): one strengthened withIRS technique, one strengthened with EB technique and one control beam. These beams were tested under monotonic loading. Further two beams, one beam for each group, strengthened according to IRS technique, were also tested under cyclic loading. The experimental results show the validity of the proposed solution in terms of structural performance and environmental sustainability. |
| first_indexed | 2024-12-10T13:15:13Z |
| format | Article |
| id | doaj.art-e3be399d23b24856a2ca7c5fb7f1666b |
| institution | Directory Open Access Journal |
| issn | 2336-5382 |
| language | English |
| last_indexed | 2024-12-10T13:15:13Z |
| publishDate | 2022-03-01 |
| publisher | CTU Central Library |
| record_format | Article |
| series | Acta Polytechnica CTU Proceedings |
| spelling | doaj.art-e3be399d23b24856a2ca7c5fb7f1666b2022-12-22T01:47:35ZengCTU Central LibraryActa Polytechnica CTU Proceedings2336-53822022-03-0133323810.14311/APP.2022.33.00325214Stainless steel-FRCM system for strengthening of RC beams: towards a sustainable strengthening techniqueFrancesco Bencardino0Mattia Nisticò1Department of Civil Engineering, University of Calabria, Via P. Bucci Cubo 39B, 87036 Rende, Cosenza, ItalyDepartment of Civil Engineering, University of Calabria, Via P. Bucci Cubo 39B, 87036 Rende, Cosenza, ItalyFabric-Reinforced Cementitious Matrix (FRCM) systems for strengthening concrete structures are an alternative to traditional techniques. The FRCM system is a composite material consisting of two or more layers of cement-based matrix reinforced with dry fibres in the form of open mesh or fabric. When adhered to concrete structural members the FRCM system acts as supplemental external reinforcement. Many existing Reinforced Concrete (RC) members exhibit degradation due to the carbonation of concrete and/or corrosion of internal reinforcing steel bars. These RC members can be strengthened using stainless steel, in strip format (unidirectional fibres), embedded in a cementitious based matrix. The system, named Stainless Steel-FRCM, can be applied according to the Externally Bonded (EB) technique. In order to reduce times and costs of intervention, number of used materials, as well as the amount of chemical compounds, a novel Inhibiting-Repairing-Strengthening (IRS) technique is proposed and experimentally tested. Using a suitable matrix (thixotropic mortar with passivation properties) the main three operations of steel bars corrosion inhibition/protection, restoring of deteriorated concrete, and installation of the external strengthening can be carried out in one-step. For evaluating the effectiveness of both new strengthening system and installation technique an extensive experimental investigation was planned and developed. A part of the experimental research includes two groups of three RC beams (3.00 m and 4.80 m long): one strengthened withIRS technique, one strengthened with EB technique and one control beam. These beams were tested under monotonic loading. Further two beams, one beam for each group, strengthened according to IRS technique, were also tested under cyclic loading. The experimental results show the validity of the proposed solution in terms of structural performance and environmental sustainability.https://ojs.cvut.cz/ojs/index.php/APP/article/view/7974innovative materialsrepairstrengthening |
| spellingShingle | Francesco Bencardino Mattia Nisticò Stainless steel-FRCM system for strengthening of RC beams: towards a sustainable strengthening technique Acta Polytechnica CTU Proceedings innovative materials repair strengthening |
| title | Stainless steel-FRCM system for strengthening of RC beams: towards a sustainable strengthening technique |
| title_full | Stainless steel-FRCM system for strengthening of RC beams: towards a sustainable strengthening technique |
| title_fullStr | Stainless steel-FRCM system for strengthening of RC beams: towards a sustainable strengthening technique |
| title_full_unstemmed | Stainless steel-FRCM system for strengthening of RC beams: towards a sustainable strengthening technique |
| title_short | Stainless steel-FRCM system for strengthening of RC beams: towards a sustainable strengthening technique |
| title_sort | stainless steel frcm system for strengthening of rc beams towards a sustainable strengthening technique |
| topic | innovative materials repair strengthening |
| url | https://ojs.cvut.cz/ojs/index.php/APP/article/view/7974 |
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