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Bond Behavior of Recycled Aggregate Concrete in Pullout Tests
https://orcid.org/http://orcid.org/0009-0004-5161-1896
https://orcid.org/http://orcid.org/0000-0002-8582-3799
https://orcid.org/http://orcid.org/0000-0002-8633-4305
The concept of a circular economy aims to keep resources in circulation by reusing. To address this challenge in the construction sector, a sustainable approach involves using resource-efficient concrete (R-concrete), in which natural aggregate is partially or fully replaced with recycled aggregate (RA) from construction demolition waste. Many studies have reported that a high proportion of RA negatively impacts the mechanical properties of concrete. For structural design, determining anchorage lengths requires an understanding of bond behavior. This aspect of mechanical behavior still lacks systematic investigation regarding the properties of concrete with high amounts of recycled aggregates (RAC). To bridge this research gap, pull-out tests were conducted on 60 specimens in 12 test series. Compressive strength, splitting tensile strength, and Youngs modulus were investigated. Different aggregate composition, percentage of recycled aggregate (0%, 60%, and 100%) and maximum aggregate size (8 mm and 16 mm) were used. Bond stresses at design level were determined and compared with Eurocode 2 design rules. Comparing RAC to normal concrete (NC) a decrease in modulus of elasticity and maximum bond stress is observed. The use of RA resulted in reduced bond stiffness compared to normal concrete, which led to longer anchorage lengths with increasing recycled aggregate content compared to NC. A comparison of calculated bond stresses at design level indicate that Eurocode 2 design rules can be employed for R-concretes with varying proportions of recycled aggregate.
Bond Behavior of Recycled Aggregate Concrete in Pullout Tests
https://orcid.org/http://orcid.org/0009-0004-5161-1896
https://orcid.org/http://orcid.org/0000-0002-8582-3799
https://orcid.org/http://orcid.org/0000-0002-8633-4305
The concept of a circular economy aims to keep resources in circulation by reusing. To address this challenge in the construction sector, a sustainable approach involves using resource-efficient concrete (R-concrete), in which natural aggregate is partially or fully replaced with recycled aggregate (RA) from construction demolition waste. Many studies have reported that a high proportion of RA negatively impacts the mechanical properties of concrete. For structural design, determining anchorage lengths requires an understanding of bond behavior. This aspect of mechanical behavior still lacks systematic investigation regarding the properties of concrete with high amounts of recycled aggregates (RAC). To bridge this research gap, pull-out tests were conducted on 60 specimens in 12 test series. Compressive strength, splitting tensile strength, and Youngs modulus were investigated. Different aggregate composition, percentage of recycled aggregate (0%, 60%, and 100%) and maximum aggregate size (8 mm and 16 mm) were used. Bond stresses at design level were determined and compared with Eurocode 2 design rules. Comparing RAC to normal concrete (NC) a decrease in modulus of elasticity and maximum bond stress is observed. The use of RA resulted in reduced bond stiffness compared to normal concrete, which led to longer anchorage lengths with increasing recycled aggregate content compared to NC. A comparison of calculated bond stresses at design level indicate that Eurocode 2 design rules can be employed for R-concretes with varying proportions of recycled aggregate.
Bond Behavior of Recycled Aggregate Concrete in Pullout Tests
https://orcid.org/http://orcid.org/0009-0004-5161-1896
https://orcid.org/http://orcid.org/0000-0002-8582-3799
https://orcid.org/http://orcid.org/0000-0002-8633-4305
The concept of a circular economy aims to keep resources in circulation by reusing. To address this challenge in the construction sector, a sustainable approach involves using resource-efficient concrete (R-concrete), in which natural aggregate is partially or fully replaced with recycled aggregate (RA) from construction demolition waste. Many studies have reported that a high proportion of RA negatively impacts the mechanical properties of concrete. For structural design, determining anchorage lengths requires an understanding of bond behavior. This aspect of mechanical behavior still lacks systematic investigation regarding the properties of concrete with high amounts of recycled aggregates (RAC). To bridge this research gap, pull-out tests were conducted on 60 specimens in 12 test series. Compressive strength, splitting tensile strength, and Youngs modulus were investigated. Different aggregate composition, percentage of recycled aggregate (0%, 60%, and 100%) and maximum aggregate size (8 mm and 16 mm) were used. Bond stresses at design level were determined and compared with Eurocode 2 design rules. Comparing RAC to normal concrete (NC) a decrease in modulus of elasticity and maximum bond stress is observed. The use of RA resulted in reduced bond stiffness compared to normal concrete, which led to longer anchorage lengths with increasing recycled aggregate content compared to NC. A comparison of calculated bond stresses at design level indicate that Eurocode 2 design rules can be employed for R-concretes with varying proportions of recycled aggregate.
Bond Behavior of Recycled Aggregate Concrete in Pullout Tests
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) / Wild, Peter (author) / Baudrexler, Andreas (author) / Kustermann, Andrea (author) / Stengel, Thorsten (author)
FIB International Conference on Concrete Sustainability ; 2024 ; Guimarães, Portugal
4th fib International Conference on Concrete Sustainability (ICCS2024) ; Chapter: 6 ; 45-53
2024-12-29
9 pages
Article/Chapter (Book)
Electronic Resource
English
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