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Characterization of Recycled Concrete Aggregates Containing Chlorides and its Influence on Hardened Concrete Properties as Well as on Corrosion
https://orcid.org/http://orcid.org/0009-0008-7495-2908
https://orcid.org/http://orcid.org/0000-0002-7378-2619
https://orcid.org/http://orcid.org/0000-0002-8582-3799
https://orcid.org/http://orcid.org/0000-0003-0867-394X
https://orcid.org/http://orcid.org/0000-0002-7306-8845
In order to reduce demolition waste and limit sand and gravel mining, the use of recycled aggregates (RCA) in concrete is becoming important. This also involves the use of chloride-contaminated material, which has rarely been used or is not permitted due to the risk of chloride-induced corrosion. In particular for components under dry conditions, e.g. interior walls, the use is unproblematic, provided that the chloride concentration is limited to a non-critical level. The aim is to investigate the properties of recycled concrete (RC) with 100% RCA with different chloride contents.
Chloride-contaminated RCA was obtained from demolition construction sites and laboratory samples, crushed to a grain size fraction of 0 - 16 mm and characterised in regard to its physical and chemical properties. The chloride content was analysed on the RCA itself, on the eluate of the RCA and on the chloride-contaminated RC-samples produced from the RCA. The influence of the chloride containing aggregate on the corrosion behaviour was investigated by polarization tests on reinforcing steel in eluted solution and in RC.
We intend to develop RC with up to 100% RCA (incl. Recycled sand and chlorides) according to the planned exposure. The expectation is to obtain a maximum chloride concentration for building components under dry and weathered conditions to avoid harmful corrosion. The results show that the RC-samples have lower chloride contents than the RCAs. The corrosion tests indicate that chloride contents of the RCA below 0.10 wt.-% do not lead to significant corrosion rates whereas the eluate is likely to initiate harmful corrosion.
Characterization of Recycled Concrete Aggregates Containing Chlorides and its Influence on Hardened Concrete Properties as Well as on Corrosion
https://orcid.org/http://orcid.org/0009-0008-7495-2908
https://orcid.org/http://orcid.org/0000-0002-7378-2619
https://orcid.org/http://orcid.org/0000-0002-8582-3799
https://orcid.org/http://orcid.org/0000-0003-0867-394X
https://orcid.org/http://orcid.org/0000-0002-7306-8845
In order to reduce demolition waste and limit sand and gravel mining, the use of recycled aggregates (RCA) in concrete is becoming important. This also involves the use of chloride-contaminated material, which has rarely been used or is not permitted due to the risk of chloride-induced corrosion. In particular for components under dry conditions, e.g. interior walls, the use is unproblematic, provided that the chloride concentration is limited to a non-critical level. The aim is to investigate the properties of recycled concrete (RC) with 100% RCA with different chloride contents.
Chloride-contaminated RCA was obtained from demolition construction sites and laboratory samples, crushed to a grain size fraction of 0 - 16 mm and characterised in regard to its physical and chemical properties. The chloride content was analysed on the RCA itself, on the eluate of the RCA and on the chloride-contaminated RC-samples produced from the RCA. The influence of the chloride containing aggregate on the corrosion behaviour was investigated by polarization tests on reinforcing steel in eluted solution and in RC.
We intend to develop RC with up to 100% RCA (incl. Recycled sand and chlorides) according to the planned exposure. The expectation is to obtain a maximum chloride concentration for building components under dry and weathered conditions to avoid harmful corrosion. The results show that the RC-samples have lower chloride contents than the RCAs. The corrosion tests indicate that chloride contents of the RCA below 0.10 wt.-% do not lead to significant corrosion rates whereas the eluate is likely to initiate harmful corrosion.
Characterization of Recycled Concrete Aggregates Containing Chlorides and its Influence on Hardened Concrete Properties as Well as on Corrosion
https://orcid.org/http://orcid.org/0009-0008-7495-2908
https://orcid.org/http://orcid.org/0000-0002-7378-2619
https://orcid.org/http://orcid.org/0000-0002-8582-3799
https://orcid.org/http://orcid.org/0000-0003-0867-394X
https://orcid.org/http://orcid.org/0000-0002-7306-8845
In order to reduce demolition waste and limit sand and gravel mining, the use of recycled aggregates (RCA) in concrete is becoming important. This also involves the use of chloride-contaminated material, which has rarely been used or is not permitted due to the risk of chloride-induced corrosion. In particular for components under dry conditions, e.g. interior walls, the use is unproblematic, provided that the chloride concentration is limited to a non-critical level. The aim is to investigate the properties of recycled concrete (RC) with 100% RCA with different chloride contents.
Chloride-contaminated RCA was obtained from demolition construction sites and laboratory samples, crushed to a grain size fraction of 0 - 16 mm and characterised in regard to its physical and chemical properties. The chloride content was analysed on the RCA itself, on the eluate of the RCA and on the chloride-contaminated RC-samples produced from the RCA. The influence of the chloride containing aggregate on the corrosion behaviour was investigated by polarization tests on reinforcing steel in eluted solution and in RC.
We intend to develop RC with up to 100% RCA (incl. Recycled sand and chlorides) according to the planned exposure. The expectation is to obtain a maximum chloride concentration for building components under dry and weathered conditions to avoid harmful corrosion. The results show that the RC-samples have lower chloride contents than the RCAs. The corrosion tests indicate that chloride contents of the RCA below 0.10 wt.-% do not lead to significant corrosion rates whereas the eluate is likely to initiate harmful corrosion.
Characterization of Recycled Concrete Aggregates Containing Chlorides and its Influence on Hardened Concrete Properties as Well as on Corrosion
Lecture Notes in Civil Engineering
Barros, Joaquim A. O. (editor) / Cunha, Vítor M. C. F. (editor) / Sousa, Hélder S. (editor) / Matos, José C. (editor) / Sena-Cruz, José M. (editor) / Zentner, Johanna (author) / Gambos, Magdalena (author) / Pollner, Toni (author) / Andrea, Kustermann (author) / Dauberschmidt, Christoph (author)
FIB International Conference on Concrete Sustainability ; 2024 ; Guimarães, Portugal
4th fib International Conference on Concrete Sustainability (ICCS2024) ; Chapter: 32 ; 263-270
2024-12-29
8 pages
Article/Chapter (Book)
Electronic Resource
English
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