A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Carbonation Resistance of Recycled Aggregate Concrete Using Different Cement Types
https://orcid.org/http://orcid.org/0000-0003-2208-6207
This paper describes the influence of the cement type and the use of 50% coarse RCA on the carbonation resistance of concrete. Twelve concrete mixtures were produced using four types of cement (CEM I, CEM IIAL, CEM IIAS and CEM IV of 42.5 MPa) and three different types of coarse aggregates (natural, RCA and carbonated-RCA [C-RCA]). All the concretes used 300 kg of cement and an effective water/cement (w/c) ratio of 0.49. The compressive strength at 28 and 56 days and the carbonation rate (at the accelerated and natural carbonation test) were determined and analysed. In both carbonation processes, it was concluded that while the concretes produced with CEM IV achieved the highest carbonation rate, the IIAS concretes achieved the lowest, regardless of the types of aggregates employed. On the other hand, the concretes produced with RCA and C-RCA achieved similar carbonation rate properties. Moreover, the natural carbonation coefficient, knat, determined experimentally, was 1.6–1.8 times higher than the carbonation rate estimated by the accelerated test. According to knat and following the structural code, all the concretes produced with CEM IV and the concrete produced with IIAL cement and C-RCA aggregates would not be allowed to be used in reinforced concrete exposure to a XC4 environment.
Carbonation Resistance of Recycled Aggregate Concrete Using Different Cement Types
https://orcid.org/http://orcid.org/0000-0003-2208-6207
This paper describes the influence of the cement type and the use of 50% coarse RCA on the carbonation resistance of concrete. Twelve concrete mixtures were produced using four types of cement (CEM I, CEM IIAL, CEM IIAS and CEM IV of 42.5 MPa) and three different types of coarse aggregates (natural, RCA and carbonated-RCA [C-RCA]). All the concretes used 300 kg of cement and an effective water/cement (w/c) ratio of 0.49. The compressive strength at 28 and 56 days and the carbonation rate (at the accelerated and natural carbonation test) were determined and analysed. In both carbonation processes, it was concluded that while the concretes produced with CEM IV achieved the highest carbonation rate, the IIAS concretes achieved the lowest, regardless of the types of aggregates employed. On the other hand, the concretes produced with RCA and C-RCA achieved similar carbonation rate properties. Moreover, the natural carbonation coefficient, knat, determined experimentally, was 1.6–1.8 times higher than the carbonation rate estimated by the accelerated test. According to knat and following the structural code, all the concretes produced with CEM IV and the concrete produced with IIAL cement and C-RCA aggregates would not be allowed to be used in reinforced concrete exposure to a XC4 environment.
Carbonation Resistance of Recycled Aggregate Concrete Using Different Cement Types
https://orcid.org/http://orcid.org/0000-0003-2208-6207
This paper describes the influence of the cement type and the use of 50% coarse RCA on the carbonation resistance of concrete. Twelve concrete mixtures were produced using four types of cement (CEM I, CEM IIAL, CEM IIAS and CEM IV of 42.5 MPa) and three different types of coarse aggregates (natural, RCA and carbonated-RCA [C-RCA]). All the concretes used 300 kg of cement and an effective water/cement (w/c) ratio of 0.49. The compressive strength at 28 and 56 days and the carbonation rate (at the accelerated and natural carbonation test) were determined and analysed. In both carbonation processes, it was concluded that while the concretes produced with CEM IV achieved the highest carbonation rate, the IIAS concretes achieved the lowest, regardless of the types of aggregates employed. On the other hand, the concretes produced with RCA and C-RCA achieved similar carbonation rate properties. Moreover, the natural carbonation coefficient, knat, determined experimentally, was 1.6–1.8 times higher than the carbonation rate estimated by the accelerated test. According to knat and following the structural code, all the concretes produced with CEM IV and the concrete produced with IIAL cement and C-RCA aggregates would not be allowed to be used in reinforced concrete exposure to a XC4 environment.
Carbonation Resistance of Recycled Aggregate Concrete Using Different Cement Types
RILEM Bookseries
Jędrzejewska, Agnieszka (editor) / Kanavaris, Fragkoulis (editor) / Azenha, Miguel (editor) / Benboudjema, Farid (editor) / Schlicke, Dirk (editor) / Etxeberria, Miren (author)
International RILEM Conference on Synergising expertise towards sustainability and robustness of CBMs and concrete structures ; 2023 ; Milos Island, Greece
2023-06-09
12 pages
Article/Chapter (Book)
Electronic Resource
English
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