Applicability of Core–Shell Hybridization Approach Using Natural and Recycled Aggregate Concrete
Abstract The aim of this research is to propose a novel technique to improve the performance of structural concrete member using recycled aggregate by creating a core–shell hybrid concrete instead of intermixing natural aggregate concrete with recycled aggregate concrete. The technique involves laye...
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| Format: | Article |
| Language: | English |
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SpringerOpen
2025-07-01
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| Series: | International Journal of Concrete Structures and Materials |
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| Online Access: | https://doi.org/10.1186/s40069-025-00790-4 |
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| author | Ji-Hyun Kim Andres Salas-Montoya Young-Chan Kim Chul-Woo Chung |
| author_facet | Ji-Hyun Kim Andres Salas-Montoya Young-Chan Kim Chul-Woo Chung |
| author_sort | Ji-Hyun Kim |
| collection | DOAJ |
| description | Abstract The aim of this research is to propose a novel technique to improve the performance of structural concrete member using recycled aggregate by creating a core–shell hybrid concrete instead of intermixing natural aggregate concrete with recycled aggregate concrete. The technique involves layered casting of a recycled aggregate concrete with natural aggregate concrete, either as a core or as a shell, to prove whether this core–shell hybridization approach has a potential to facilitate the utilization of recycled aggregate for structural concrete. Various core–shell combinations were made using w/c 0.3 and 0.5 concretes, and compressive strength, elastic modulus, and chloride ion diffusivity of the hybrid specimens were measured. This paper also investigated the effects of two-stage mixing approach on properties of recycled aggregate concrete and hybrid concrete. It was found that placing stronger NAC at the outer shell provided higher compressive strength and elastic modulus of core–shell hybrid concrete. Placing NAC at the outer shell also provided lower chloride ion diffusivity as it acted as a diffusion barrier. It is recommended to place a stronger and more durable natural aggregate concrete in the shell to have better mechanical properties and durability. A synergetic effect of hybridization was observed from elastic modulus, not from the compressive strength. It was also found that compressive strength and elastic modulus of core–shell hybrid concrete were successfully estimated using those of control concrete specimens. |
| format | Article |
| id | doaj-art-a38cc4de07f2475bb5ea4cf788c68ed8 |
| institution | Kabale University |
| issn | 2234-1315 |
| language | English |
| publishDate | 2025-07-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | International Journal of Concrete Structures and Materials |
| spelling | doaj-art-a38cc4de07f2475bb5ea4cf788c68ed82025-08-20T03:45:27ZengSpringerOpenInternational Journal of Concrete Structures and Materials2234-13152025-07-0119111810.1186/s40069-025-00790-4Applicability of Core–Shell Hybridization Approach Using Natural and Recycled Aggregate ConcreteJi-Hyun Kim0Andres Salas-Montoya1Young-Chan Kim2Chul-Woo Chung3Division of Architectural and Fire Protection Engineering, Pukyong National UniversityDepartment of Civil Engineering, Universidad Nacional de ColombiaDivision of Architectural and Fire Protection Engineering, Pukyong National UniversityDivision of Architectural and Fire Protection Engineering, Pukyong National UniversityAbstract The aim of this research is to propose a novel technique to improve the performance of structural concrete member using recycled aggregate by creating a core–shell hybrid concrete instead of intermixing natural aggregate concrete with recycled aggregate concrete. The technique involves layered casting of a recycled aggregate concrete with natural aggregate concrete, either as a core or as a shell, to prove whether this core–shell hybridization approach has a potential to facilitate the utilization of recycled aggregate for structural concrete. Various core–shell combinations were made using w/c 0.3 and 0.5 concretes, and compressive strength, elastic modulus, and chloride ion diffusivity of the hybrid specimens were measured. This paper also investigated the effects of two-stage mixing approach on properties of recycled aggregate concrete and hybrid concrete. It was found that placing stronger NAC at the outer shell provided higher compressive strength and elastic modulus of core–shell hybrid concrete. Placing NAC at the outer shell also provided lower chloride ion diffusivity as it acted as a diffusion barrier. It is recommended to place a stronger and more durable natural aggregate concrete in the shell to have better mechanical properties and durability. A synergetic effect of hybridization was observed from elastic modulus, not from the compressive strength. It was also found that compressive strength and elastic modulus of core–shell hybrid concrete were successfully estimated using those of control concrete specimens.https://doi.org/10.1186/s40069-025-00790-4Recycled aggregateLayered castingTwo-stage mixingCompressive strengthElastic modulusCore–shell hybrid |
| spellingShingle | Ji-Hyun Kim Andres Salas-Montoya Young-Chan Kim Chul-Woo Chung Applicability of Core–Shell Hybridization Approach Using Natural and Recycled Aggregate Concrete International Journal of Concrete Structures and Materials Recycled aggregate Layered casting Two-stage mixing Compressive strength Elastic modulus Core–shell hybrid |
| title | Applicability of Core–Shell Hybridization Approach Using Natural and Recycled Aggregate Concrete |
| title_full | Applicability of Core–Shell Hybridization Approach Using Natural and Recycled Aggregate Concrete |
| title_fullStr | Applicability of Core–Shell Hybridization Approach Using Natural and Recycled Aggregate Concrete |
| title_full_unstemmed | Applicability of Core–Shell Hybridization Approach Using Natural and Recycled Aggregate Concrete |
| title_short | Applicability of Core–Shell Hybridization Approach Using Natural and Recycled Aggregate Concrete |
| title_sort | applicability of core shell hybridization approach using natural and recycled aggregate concrete |
| topic | Recycled aggregate Layered casting Two-stage mixing Compressive strength Elastic modulus Core–shell hybrid |
| url | https://doi.org/10.1186/s40069-025-00790-4 |
| work_keys_str_mv | AT jihyunkim applicabilityofcoreshellhybridizationapproachusingnaturalandrecycledaggregateconcrete AT andressalasmontoya applicabilityofcoreshellhybridizationapproachusingnaturalandrecycledaggregateconcrete AT youngchankim applicabilityofcoreshellhybridizationapproachusingnaturalandrecycledaggregateconcrete AT chulwoochung applicabilityofcoreshellhybridizationapproachusingnaturalandrecycledaggregateconcrete |