Examination of sulfate resistance of nano-alumina added ordinary Portland cement paste, focusing on the two different crystallinity of nano-aluminas
Abstract 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,...
| Main Authors: | , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
SpringerOpen
2023-06-01
|
| Series: | International Journal of Concrete Structures and Materials |
| Subjects: | |
| Online Access: | https://doi.org/10.1186/s40069-023-00591-7 |
| _version_ | 1797811554823962624 |
|---|---|
| author | Juan Yu Sungwon Sim Haemin Song Dohoon Kim Kyungcheol Jang Dongho Jeon Seung Cho Jae Eun Oh |
| author_facet | Juan Yu Sungwon Sim Haemin Song Dohoon Kim Kyungcheol Jang Dongho Jeon Seung Cho Jae Eun Oh |
| author_sort | Juan Yu |
| collection | DOAJ |
| description | Abstract 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. |
| first_indexed | 2024-03-13T07:25:28Z |
| format | Article |
| id | doaj.art-86ba05f85e45430eba9286187cf99085 |
| institution | Directory Open Access Journal |
| issn | 2234-1315 |
| language | English |
| last_indexed | 2024-03-13T07:25:28Z |
| publishDate | 2023-06-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | International Journal of Concrete Structures and Materials |
| spelling | doaj.art-86ba05f85e45430eba9286187cf990852023-06-04T11:24:06ZengSpringerOpenInternational Journal of Concrete Structures and Materials2234-13152023-06-0117111110.1186/s40069-023-00591-7Examination of sulfate resistance of nano-alumina added ordinary Portland cement paste, focusing on the two different crystallinity of nano-aluminasJuan Yu0Sungwon Sim1Haemin Song2Dohoon Kim3Kyungcheol Jang4Dongho Jeon5Seung Cho6Jae Eun Oh7School of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology (UNIST)School of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology (UNIST)School of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology (UNIST)School of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology (UNIST)School of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology (UNIST)School of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology (UNIST)School of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology (UNIST)School of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology (UNIST)Abstract 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.https://doi.org/10.1186/s40069-023-00591-7Nano-aluminaOrdinary Portland cementDegree of crystallinityAlumina dissolutionSulfate attackα- and γ-alumina |
| spellingShingle | Juan Yu Sungwon Sim Haemin Song Dohoon Kim Kyungcheol Jang Dongho Jeon Seung Cho Jae Eun Oh Examination of sulfate resistance of nano-alumina added ordinary Portland cement paste, focusing on the two different crystallinity of nano-aluminas International Journal of Concrete Structures and Materials Nano-alumina Ordinary Portland cement Degree of crystallinity Alumina dissolution Sulfate attack α- and γ-alumina |
| title | Examination of sulfate resistance of nano-alumina added ordinary Portland cement paste, focusing on the two different crystallinity of nano-aluminas |
| title_full | Examination of sulfate resistance of nano-alumina added ordinary Portland cement paste, focusing on the two different crystallinity of nano-aluminas |
| title_fullStr | Examination of sulfate resistance of nano-alumina added ordinary Portland cement paste, focusing on the two different crystallinity of nano-aluminas |
| title_full_unstemmed | Examination of sulfate resistance of nano-alumina added ordinary Portland cement paste, focusing on the two different crystallinity of nano-aluminas |
| title_short | Examination of sulfate resistance of nano-alumina added ordinary Portland cement paste, focusing on the two different crystallinity of nano-aluminas |
| title_sort | examination of sulfate resistance of nano alumina added ordinary portland cement paste focusing on the two different crystallinity of nano aluminas |
| topic | Nano-alumina Ordinary Portland cement Degree of crystallinity Alumina dissolution Sulfate attack α- and γ-alumina |
| url | https://doi.org/10.1186/s40069-023-00591-7 |
| work_keys_str_mv | AT juanyu examinationofsulfateresistanceofnanoaluminaaddedordinaryportlandcementpastefocusingonthetwodifferentcrystallinityofnanoaluminas AT sungwonsim examinationofsulfateresistanceofnanoaluminaaddedordinaryportlandcementpastefocusingonthetwodifferentcrystallinityofnanoaluminas AT haeminsong examinationofsulfateresistanceofnanoaluminaaddedordinaryportlandcementpastefocusingonthetwodifferentcrystallinityofnanoaluminas AT dohoonkim examinationofsulfateresistanceofnanoaluminaaddedordinaryportlandcementpastefocusingonthetwodifferentcrystallinityofnanoaluminas AT kyungcheoljang examinationofsulfateresistanceofnanoaluminaaddedordinaryportlandcementpastefocusingonthetwodifferentcrystallinityofnanoaluminas AT donghojeon examinationofsulfateresistanceofnanoaluminaaddedordinaryportlandcementpastefocusingonthetwodifferentcrystallinityofnanoaluminas AT seungcho examinationofsulfateresistanceofnanoaluminaaddedordinaryportlandcementpastefocusingonthetwodifferentcrystallinityofnanoaluminas AT jaeeunoh examinationofsulfateresistanceofnanoaluminaaddedordinaryportlandcementpastefocusingonthetwodifferentcrystallinityofnanoaluminas |