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논문 기본 정보

자료유형
학술저널
저자정보
Sahyeon Lee (Ulsan National Institute of Science and Technology) Seung Yup Jang (Korea National University of Transportation) Chan Young Kim (Ulsan National Institute of Science and Technology) Eun Jong Ahn (Ulsan National Institute of Science and Technology) Seung Pil Kim (Ulsan National Institute of Science and Technology) Seongwoo Gwon (Ulsan National Institute of Science and Technology) Myoungsu Shin (Ulsan National Institute of Science and Technology)
저널정보
한국콘크리트학회 International Journal of Concrete Structures and Materials International Journal of Concrete Structures and Materials Vol.12 No.7
발행연도
2018.11
수록면
1,093 - 1,109 (17page)

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초록· 키워드

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The rapid-hardening method employing the injection of calcium sulfoaluminate (CSA) cement mortar into voids between preplaced ballast aggregates has recently emerged as a promising approach for the renovation of existing ballasted railway tracks to concrete tracks. This method typically involves the use of a redispersible polymer powder to enhance the durability of the resulting recycled aggregate concrete. However, the effects of the amount of polymer on the mechanical and durability properties of recycled ballast aggregate concrete were not clearly understood. In addition, the effects of the cleanness condition of ballast aggregates were never examined. This study aimed at investigating these two aspects through compression and flexure tests, shrinkage tests, freezing–thawing resistance tests, and optical microscopy. The results revealed that an increase in the amount of polymer generally decreased the compressive strength at the curing age of 28 days. However, the use of a higher polymer ratio enhanced the modulus of rupture, freezing–thawing resistance, and shrinkage resistance, likely because it improved the microstructure of the interfacial transition zones between recycled ballast aggregates and injected mortar. In addition, a higher cleanness level of ballast aggregates generally improved the mechanical and durability qualities of concrete.

목차

Abstract
1 Background
2 Materials and Specimens
3 Test Methods
4 Test Results
5 Conclusion
References

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