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Influence of Cracks on the Carbonation Resistance of Recycled Aggregate Concrete

Authorized Users Only
2021
Authors
Carević, Vedran
Ignjatović, Ivan
Conference object (Published version)
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Abstract
The use of recycled concrete aggregate (RCA) for the production of new concrete can be a promising eco-efficient solution. However, replacement of natural aggregate (NA) with RCA influences concrete’s durability performance. One of major durability problems worldwide is carbonation-induced corrosion, given that a large number of infrastructural objects are exposed to a CO2-rich environment. There are many factors that affect carbonation process, but possibly the most important one is the appearance of cracks in reinforced concrete (RC) structures. Currently, the cracks have not yet been considered as a parameter in carbonation model which is used for defining the service life of RC structures. The objective of this research was to analyse the influence of cracked concrete cover as a good reinforcement protection. In order to ensure a sustainable application of recycle aggregate concrete (RAC), an analysis was performed on RAC with 100% replacement of coarse NA with RCA. The analysis wa...s carried out using own experimental results and the application of existing fib Model Code 2010 carbonation depth prediction model derived for NA concrete. For that purpose, prismatic RC samples without cracks and with different crack width (0.05 mm, 0.10 mm, 0.15 mm, 0.20 mm and 0.30 mm) were made and subjected to accelerated carbonation. The compressive and tensile stress influence on carbonation resistance was evaluated as well as reinforcing bar corrosion at crack position. The conducted analysis showed that even with low crack widths (0.05 mm) the maximum carbonation depth was significantly higher compared with the uncracked samples. The results showed that compressive stress increase had no significant difference in the carbonation depth of samples.

Keywords:
Recycled concrete / Carbonation / Crack width / Accelerated test / Service life
Source:
Proceedings for the 2021 fib Symposium Concrete Structures: New Trends for Eco-Efficiency and Performance, 2021, 422-431
Publisher:
  • Fib
Funding / projects:
  • Utilization of by-products and recycled waste materials in concrete composites in the scope of sustainable construction development in Serbia: investigation and environmental assessment of possible applications (RS-36017)

ISBN: 978-2-940643-08-0

ISSN: 2617-4820

[ Google Scholar ]
Handle
https://hdl.handle.net/21.15107/rcub_grafar_2374
URI
https://grafar.grf.bg.ac.rs/handle/123456789/2374
Collections
  • Катедра за материјале и конструкције
Institution/Community
GraFar
TY  - CONF
AU  - Carević, Vedran
AU  - Ignjatović, Ivan
PY  - 2021
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/2374
AB  - The use of recycled concrete aggregate (RCA) for the production of new concrete can be a promising eco-efficient solution. However, replacement of natural aggregate (NA) with RCA influences concrete’s durability performance. One of major durability problems worldwide is carbonation-induced corrosion, given that a large number of infrastructural objects are exposed to a CO2-rich environment. There are many factors that affect carbonation process, but possibly the most important one is the appearance of cracks in reinforced concrete (RC) structures. Currently, the cracks have not yet been considered as a parameter in carbonation model which is used for defining the service life of RC structures. The objective of this research was to analyse the influence of cracked concrete cover as a good reinforcement protection. In order to ensure a sustainable application of recycle aggregate concrete (RAC), an analysis was performed on RAC with 100% replacement of coarse NA with RCA. The analysis was carried out using own experimental results and the application of existing fib Model Code 2010 carbonation depth prediction model derived for NA concrete. For that purpose, prismatic RC samples without cracks and with different crack width (0.05 mm, 0.10 mm, 0.15 mm, 0.20 mm and 0.30 mm) were made and subjected to accelerated carbonation. The compressive and tensile stress influence on carbonation resistance was evaluated as well as reinforcing bar corrosion at crack position. The conducted analysis showed that even with low crack widths (0.05 mm) the maximum carbonation depth was significantly higher compared with the uncracked samples. The results showed that compressive stress increase had no significant difference in the carbonation depth of samples.
PB  - Fib
C3  - Proceedings for the 2021 fib Symposium Concrete Structures: New Trends for Eco-Efficiency and Performance
T1  - Influence of Cracks on the Carbonation Resistance of Recycled Aggregate Concrete
EP  - 431
SP  - 422
UR  - https://hdl.handle.net/21.15107/rcub_grafar_2374
ER  - 
@conference{
author = "Carević, Vedran and Ignjatović, Ivan",
year = "2021",
abstract = "The use of recycled concrete aggregate (RCA) for the production of new concrete can be a promising eco-efficient solution. However, replacement of natural aggregate (NA) with RCA influences concrete’s durability performance. One of major durability problems worldwide is carbonation-induced corrosion, given that a large number of infrastructural objects are exposed to a CO2-rich environment. There are many factors that affect carbonation process, but possibly the most important one is the appearance of cracks in reinforced concrete (RC) structures. Currently, the cracks have not yet been considered as a parameter in carbonation model which is used for defining the service life of RC structures. The objective of this research was to analyse the influence of cracked concrete cover as a good reinforcement protection. In order to ensure a sustainable application of recycle aggregate concrete (RAC), an analysis was performed on RAC with 100% replacement of coarse NA with RCA. The analysis was carried out using own experimental results and the application of existing fib Model Code 2010 carbonation depth prediction model derived for NA concrete. For that purpose, prismatic RC samples without cracks and with different crack width (0.05 mm, 0.10 mm, 0.15 mm, 0.20 mm and 0.30 mm) were made and subjected to accelerated carbonation. The compressive and tensile stress influence on carbonation resistance was evaluated as well as reinforcing bar corrosion at crack position. The conducted analysis showed that even with low crack widths (0.05 mm) the maximum carbonation depth was significantly higher compared with the uncracked samples. The results showed that compressive stress increase had no significant difference in the carbonation depth of samples.",
publisher = "Fib",
journal = "Proceedings for the 2021 fib Symposium Concrete Structures: New Trends for Eco-Efficiency and Performance",
title = "Influence of Cracks on the Carbonation Resistance of Recycled Aggregate Concrete",
pages = "431-422",
url = "https://hdl.handle.net/21.15107/rcub_grafar_2374"
}
Carević, V.,& Ignjatović, I.. (2021). Influence of Cracks on the Carbonation Resistance of Recycled Aggregate Concrete. in Proceedings for the 2021 fib Symposium Concrete Structures: New Trends for Eco-Efficiency and Performance
Fib., 422-431.
https://hdl.handle.net/21.15107/rcub_grafar_2374
Carević V, Ignjatović I. Influence of Cracks on the Carbonation Resistance of Recycled Aggregate Concrete. in Proceedings for the 2021 fib Symposium Concrete Structures: New Trends for Eco-Efficiency and Performance. 2021;:422-431.
https://hdl.handle.net/21.15107/rcub_grafar_2374 .
Carević, Vedran, Ignjatović, Ivan, "Influence of Cracks on the Carbonation Resistance of Recycled Aggregate Concrete" in Proceedings for the 2021 fib Symposium Concrete Structures: New Trends for Eco-Efficiency and Performance (2021):422-431,
https://hdl.handle.net/21.15107/rcub_grafar_2374 .

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