Effect of cracks on the service life of RC structures exposed to chlorides
To move towards a more sustainable concrete, the enhancement of its durability is strongly encouraged and, dealing in particular with reinforced concrete (RC), this mainly means to prevent the damage due to environmental actions, e.g. due to chloride-induced corrosion. Therefore, there is the need o...
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| Format: | Article |
| Language: | English |
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Czech Technical University in Prague
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/8039 |
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| author | Nicoletta Russo Matteo Gastaldi Luca Schiavi Alberto Strini Riccardo Zanoni Federica Lollini |
| author_facet | Nicoletta Russo Matteo Gastaldi Luca Schiavi Alberto Strini Riccardo Zanoni Federica Lollini |
| author_sort | Nicoletta Russo |
| collection | DOAJ |
| description | To move towards a more sustainable concrete, the enhancement of its durability is strongly encouraged and, dealing in particular with reinforced concrete (RC), this mainly means to prevent the damage due to environmental actions, e.g. due to chloride-induced corrosion. Therefore, there is the need of models aimed at designing durable structures. Usually the service life design models consider concrete in uncracked condition. In real structures, however, several phenomena can generate cracks on concrete surface, leading to an acceleration of the corrosion of steel rebar. A number of studies have been recently carried out in order to evaluate the influence of cracks on reinforced concrete durability in chloride-contaminated environment, however the knowledge of the effect of cracks on the initiation and propagation periods is still lacking. Furthermore, few studies have considered additional protection strategies, such as the use of stainless steel rebar. In this work, experimental results are presented concerning the influence of cracks on the service life of reinforced concrete structures in order to evaluate if cracks lead to an earlier corrosion initiation induced by chlorides. Prismatic specimens, reinforced with carbon steel and 304L stainless steel bars, were longitudinally cracked and exposed to ponding with 3.5% NaCl solution. The monitoring of corrosion behaviour showed that when cracks reached the steel surface corrosion initiated immediately. |
| format | Article |
| id | doaj-art-b32b035c0cec46149e547e4c6799aa42 |
| institution | Matheson Library |
| issn | 2336-5382 |
| language | English |
| publishDate | 2022-03-01 |
| publisher | Czech Technical University in Prague |
| record_format | Article |
| series | Acta Polytechnica CTU Proceedings |
| spelling | doaj-art-b32b035c0cec46149e547e4c6799aa422025-08-02T17:09:00ZengCzech Technical University in PragueActa Polytechnica CTU Proceedings2336-53822022-03-013351151710.14311/APP.2022.33.05115279Effect of cracks on the service life of RC structures exposed to chloridesNicoletta Russo0Matteo Gastaldi1Luca Schiavi2Alberto Strini3Riccardo Zanoni4Federica Lollini5Politecnico di Milano, Department of Chemistry, Materials and Chemical Engineering "Giulio Natta", Piazza Leonardo da Vinci 32, 20133 Milano, ItalyPolitecnico di Milano, Department of Chemistry, Materials and Chemical Engineering "Giulio Natta", Piazza Leonardo da Vinci 32, 20133 Milano, ItalyConsiglio Nazionale delle Ricerche, Istituto per le Tecnologie della Costruzione, Viale Lombardia 49, 20098 San Giuliano Milanese, ItalyConsiglio Nazionale delle Ricerche, Istituto per le Tecnologie della Costruzione, Viale Lombardia 49, 20098 San Giuliano Milanese, ItalyConsiglio Nazionale delle Ricerche, Istituto per le Tecnologie della Costruzione, Viale Lombardia 49, 20098 San Giuliano Milanese, ItalyConsiglio Nazionale delle Ricerche, Istituto per le Tecnologie della Costruzione, Viale Lombardia 49, 20098 San Giuliano Milanese, ItalyTo move towards a more sustainable concrete, the enhancement of its durability is strongly encouraged and, dealing in particular with reinforced concrete (RC), this mainly means to prevent the damage due to environmental actions, e.g. due to chloride-induced corrosion. Therefore, there is the need of models aimed at designing durable structures. Usually the service life design models consider concrete in uncracked condition. In real structures, however, several phenomena can generate cracks on concrete surface, leading to an acceleration of the corrosion of steel rebar. A number of studies have been recently carried out in order to evaluate the influence of cracks on reinforced concrete durability in chloride-contaminated environment, however the knowledge of the effect of cracks on the initiation and propagation periods is still lacking. Furthermore, few studies have considered additional protection strategies, such as the use of stainless steel rebar. In this work, experimental results are presented concerning the influence of cracks on the service life of reinforced concrete structures in order to evaluate if cracks lead to an earlier corrosion initiation induced by chlorides. Prismatic specimens, reinforced with carbon steel and 304L stainless steel bars, were longitudinally cracked and exposed to ponding with 3.5% NaCl solution. The monitoring of corrosion behaviour showed that when cracks reached the steel surface corrosion initiated immediately.https://ojs.cvut.cz/ojs/index.php/APP/article/view/8039corrosion initiationcorrosion propagationcracked concretechloridesstainless steel |
| spellingShingle | Nicoletta Russo Matteo Gastaldi Luca Schiavi Alberto Strini Riccardo Zanoni Federica Lollini Effect of cracks on the service life of RC structures exposed to chlorides Acta Polytechnica CTU Proceedings corrosion initiation corrosion propagation cracked concrete chlorides stainless steel |
| title | Effect of cracks on the service life of RC structures exposed to chlorides |
| title_full | Effect of cracks on the service life of RC structures exposed to chlorides |
| title_fullStr | Effect of cracks on the service life of RC structures exposed to chlorides |
| title_full_unstemmed | Effect of cracks on the service life of RC structures exposed to chlorides |
| title_short | Effect of cracks on the service life of RC structures exposed to chlorides |
| title_sort | effect of cracks on the service life of rc structures exposed to chlorides |
| topic | corrosion initiation corrosion propagation cracked concrete chlorides stainless steel |
| url | https://ojs.cvut.cz/ojs/index.php/APP/article/view/8039 |
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