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논문 기본 정보

자료유형
학술저널
저자정보
Juan Yu (Ulsan National Institute of Science and Technology (UNIST)) Sungwon Sim (Ulsan National Institute of Science and Technology (UNIST)) Haemin Song (Ulsan National Institute of Science and Technology (UNIST)) Dohoon Kim (Ulsan National Institute of Science and Technology (UNIST)) Kyungcheol Jang (Ulsan National Institute of Science and Technology (UNIST)) Dongho Jeon (Ulsan National Institute of Science and Technology (UNIST)) Seung Cho (Ulsan National Institute of Science and Technology (UNIST)) Jae Eun Oh (Ulsan National Institute of Science and Technology (UNIST))
저널정보
한국콘크리트학회 International Journal of Concrete Structures and Materials International Journal of Concrete Structures and Materials Vol.17 No.5
발행연도
2023.9
수록면
799 - 809 (11page)

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초록· 키워드

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This study examined the influence of the crystallinity of added nano-alumina on the sulfate resistance of ordinary Portland cement (OPC) paste. Two crystalline types of nano-aluminas (α-and γ-phase) were incorporated in cement pastes, which were exposed to sulfate solution. In the results, both paste samples having α- and γ-phase aluminas had accelerated compressive strength loss and increased length expansion compared to the sample without alumina addition. In particular, the rapidly decreased dynamic elastic modulus of the nano-alumina added samples postulates the greatly increased internal stress likely by the increased formation of volume expansive reaction products, such as ettringite, which was supported by the XRD and TG results. The greater ettringite formation in the nano-alumina added samples was likely due to reactive AH₃ (=Al(OH)₃) gel formation as the higher consumption degree of portlandite in the alumina added samples indirectly indicates the active AH₃ gel formation, resulting in additional ettringite formation from the reaction of AH₃ with Na₂SO₄ solution. A further degree of sulfate attack was observed in the γ-alumina added sample for the long-term Na₂SO₄ exposure (180 days) mainly due to the greater degree of gypsum formation inducing more internal expansive stress compared to the α-alumina added sample.

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Abstract
1 Introduction
2 Experimental Procedure
3 Results and Discussion
4 Conclusions
References

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