The Effect of Activators on the Mechanical Properties and Microstructure of Alkali-Activated Nickel Slag
In order to mitigate problems associated with environmental pollution, alkali-activated nickel slags (AANSs) may be used as an alternative to cementitious material. However, the understanding of their mechanical properties and microstructure is currently very limited. This paper therefore explores t...
Saved in:
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Wiley
2020-01-01
|
| Series: | Advances in Civil Engineering |
| Online Access: | http://dx.doi.org/10.1155/2020/1764108 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1832550968831508480 |
|---|---|
| author | Liwei Xu Xuefang Wang Can Guan Wenda Wu Lingling Zhang |
| author_facet | Liwei Xu Xuefang Wang Can Guan Wenda Wu Lingling Zhang |
| author_sort | Liwei Xu |
| collection | DOAJ |
| description | In order to mitigate problems associated with environmental pollution, alkali-activated nickel slags (AANSs) may be used as an alternative to cementitious material. However, the understanding of their mechanical properties and microstructure is currently very limited. This paper therefore explores the influence of different types and contents of three solid alkali activators, Na2SiO3, NaOH, and Na2SiO3/Na2CO3, on the compressive strength of one-part AANS. Their microstructure, hydration components, and pore structure are analyzed by means of a scanning electron microscope, an energy-dispersive spectrometer, an X-ray diffractometer, an infrared spectrometer, and a mercury analyzer. The results show that the AANS with an Na2SiO3/Na2CO3 activator has a denser microstructure, lower porosity, and a smaller pore size when compared with the AANS with the Na2SiO3 or NaOH activators. Consequently, the compressive strength of the Na2SiO3/Na2CO3 sample reached a higher compressive strength (96 MPa) than that activated by Na2SiO3 or NaOH. This strength is optimal as well as more economical as Na2O, which increased from 0.107 mol to 0.123 mol, contributes little to compressive strength. The final part of the article discusses an optimal design for the engineering application of one-part AANS. |
| format | Article |
| id | doaj-art-4c42a5391697417fb14178151ce6deaf |
| institution | Kabale University |
| issn | 1687-8086 1687-8094 |
| language | English |
| publishDate | 2020-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Civil Engineering |
| spelling | doaj-art-4c42a5391697417fb14178151ce6deaf2025-02-03T06:05:17ZengWileyAdvances in Civil Engineering1687-80861687-80942020-01-01202010.1155/2020/17641081764108The Effect of Activators on the Mechanical Properties and Microstructure of Alkali-Activated Nickel SlagLiwei Xu0Xuefang Wang1Can Guan2Wenda Wu3Lingling Zhang4College of Civil Engineering, Fujian University of Technology, Fuzhou, Fujian, ChinaDepartment of Civil and Engineering, Fuzhou University, Fuzhou, ChinaChina Construction Strait Construction Development Co., Ltd., Fuzhou, ChinaDepartment of Civil and Engineering, Fuzhou University, Fuzhou, ChinaDepartment of Civil and Engineering, Fuzhou University, Fuzhou, ChinaIn order to mitigate problems associated with environmental pollution, alkali-activated nickel slags (AANSs) may be used as an alternative to cementitious material. However, the understanding of their mechanical properties and microstructure is currently very limited. This paper therefore explores the influence of different types and contents of three solid alkali activators, Na2SiO3, NaOH, and Na2SiO3/Na2CO3, on the compressive strength of one-part AANS. Their microstructure, hydration components, and pore structure are analyzed by means of a scanning electron microscope, an energy-dispersive spectrometer, an X-ray diffractometer, an infrared spectrometer, and a mercury analyzer. The results show that the AANS with an Na2SiO3/Na2CO3 activator has a denser microstructure, lower porosity, and a smaller pore size when compared with the AANS with the Na2SiO3 or NaOH activators. Consequently, the compressive strength of the Na2SiO3/Na2CO3 sample reached a higher compressive strength (96 MPa) than that activated by Na2SiO3 or NaOH. This strength is optimal as well as more economical as Na2O, which increased from 0.107 mol to 0.123 mol, contributes little to compressive strength. The final part of the article discusses an optimal design for the engineering application of one-part AANS.http://dx.doi.org/10.1155/2020/1764108 |
| spellingShingle | Liwei Xu Xuefang Wang Can Guan Wenda Wu Lingling Zhang The Effect of Activators on the Mechanical Properties and Microstructure of Alkali-Activated Nickel Slag Advances in Civil Engineering |
| title | The Effect of Activators on the Mechanical Properties and Microstructure of Alkali-Activated Nickel Slag |
| title_full | The Effect of Activators on the Mechanical Properties and Microstructure of Alkali-Activated Nickel Slag |
| title_fullStr | The Effect of Activators on the Mechanical Properties and Microstructure of Alkali-Activated Nickel Slag |
| title_full_unstemmed | The Effect of Activators on the Mechanical Properties and Microstructure of Alkali-Activated Nickel Slag |
| title_short | The Effect of Activators on the Mechanical Properties and Microstructure of Alkali-Activated Nickel Slag |
| title_sort | effect of activators on the mechanical properties and microstructure of alkali activated nickel slag |
| url | http://dx.doi.org/10.1155/2020/1764108 |
| work_keys_str_mv | AT liweixu theeffectofactivatorsonthemechanicalpropertiesandmicrostructureofalkaliactivatednickelslag AT xuefangwang theeffectofactivatorsonthemechanicalpropertiesandmicrostructureofalkaliactivatednickelslag AT canguan theeffectofactivatorsonthemechanicalpropertiesandmicrostructureofalkaliactivatednickelslag AT wendawu theeffectofactivatorsonthemechanicalpropertiesandmicrostructureofalkaliactivatednickelslag AT linglingzhang theeffectofactivatorsonthemechanicalpropertiesandmicrostructureofalkaliactivatednickelslag AT liweixu effectofactivatorsonthemechanicalpropertiesandmicrostructureofalkaliactivatednickelslag AT xuefangwang effectofactivatorsonthemechanicalpropertiesandmicrostructureofalkaliactivatednickelslag AT canguan effectofactivatorsonthemechanicalpropertiesandmicrostructureofalkaliactivatednickelslag AT wendawu effectofactivatorsonthemechanicalpropertiesandmicrostructureofalkaliactivatednickelslag AT linglingzhang effectofactivatorsonthemechanicalpropertiesandmicrostructureofalkaliactivatednickelslag |