Characterization, factors, and fractal dimension of pore structure of fly ash-based geopolymers
Fly ash-based geopolymer is a new cementitious material with environmentally friendly characteristics. Generally, the mechanical properties of cementitious materials are influenced by their pore structure. The variation in the pore structural characteristics of the geopolymers with various influenci...
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2023-09-01
|
| Series: | Journal of Materials Research and Technology |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785423019701 |
| _version_ | 1827780517586534400 |
|---|---|
| author | Yiwei Yang Bowen Wang Qiaoming Yuan Dunwen Huang Hui Peng |
| author_facet | Yiwei Yang Bowen Wang Qiaoming Yuan Dunwen Huang Hui Peng |
| author_sort | Yiwei Yang |
| collection | DOAJ |
| description | Fly ash-based geopolymer is a new cementitious material with environmentally friendly characteristics. Generally, the mechanical properties of cementitious materials are influenced by their pore structure. The variation in the pore structural characteristics of the geopolymers with various influencing factors was investigated in this study. A smaller activator modulus and liquid-solid ratio lead to a finer pore structure, while higher activator concentrations also result in a finer pore structure. However, the densification of pore structure does not follow a monotonic relationship with the conserving temperature. Increasing the conserving temperature within a certain range decreases the most probable pore diameter and porosity. Nevertheless, excessive temperature increase has the opposite effect. Furthermore, the fractal dimension was introduced to characterize the pore structure comprehensively. The results show that a lower pore volume, a larger pore-specific surface area, and a smaller most probable pore diameter contribute to increasing pore surface fractal dimension. Further, compared to porosity, the microporous pore surface fractal dimension shows a better linear correlation with compressive strength. |
| first_indexed | 2024-03-11T15:05:24Z |
| format | Article |
| id | doaj.art-0abee541957c44a1a38aeb81a1471d34 |
| institution | Directory Open Access Journal |
| issn | 2238-7854 |
| language | English |
| last_indexed | 2024-03-11T15:05:24Z |
| publishDate | 2023-09-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj.art-0abee541957c44a1a38aeb81a1471d342023-10-30T06:03:39ZengElsevierJournal of Materials Research and Technology2238-78542023-09-012633953407Characterization, factors, and fractal dimension of pore structure of fly ash-based geopolymersYiwei Yang0Bowen Wang1Qiaoming Yuan2Dunwen Huang3Hui Peng4School of Civil Engineering, Changsha University of Science and Technology, Changsha, Hunan, 410114, ChinaSchool of Civil Engineering, Changsha University of Science and Technology, Changsha, Hunan, 410114, ChinaSchool of Civil Engineering, Changsha University of Science and Technology, Changsha, Hunan, 410114, ChinaSchool of Civil Engineering, Changsha University of Science and Technology, Changsha, Hunan, 410114, China; National-Local Joint Engineering Laboratory of Technology for Long-term Performance Enhancement of Bridges in Southern District, Changsha University of Science and Technology, Changsha, Hunan, 410114, China; Corresponding author. School of Civil Engineering, Changsha University of Science and Technology, Changsha, Hunan, 410114, China.School of Civil Engineering, Changsha University of Science and Technology, Changsha, Hunan, 410114, China; National-Local Joint Engineering Laboratory of Technology for Long-term Performance Enhancement of Bridges in Southern District, Changsha University of Science and Technology, Changsha, Hunan, 410114, China; Corresponding author. School of Civil Engineering, Changsha University of Science and Technology, Changsha, Hunan, 410114, China.Fly ash-based geopolymer is a new cementitious material with environmentally friendly characteristics. Generally, the mechanical properties of cementitious materials are influenced by their pore structure. The variation in the pore structural characteristics of the geopolymers with various influencing factors was investigated in this study. A smaller activator modulus and liquid-solid ratio lead to a finer pore structure, while higher activator concentrations also result in a finer pore structure. However, the densification of pore structure does not follow a monotonic relationship with the conserving temperature. Increasing the conserving temperature within a certain range decreases the most probable pore diameter and porosity. Nevertheless, excessive temperature increase has the opposite effect. Furthermore, the fractal dimension was introduced to characterize the pore structure comprehensively. The results show that a lower pore volume, a larger pore-specific surface area, and a smaller most probable pore diameter contribute to increasing pore surface fractal dimension. Further, compared to porosity, the microporous pore surface fractal dimension shows a better linear correlation with compressive strength.http://www.sciencedirect.com/science/article/pii/S2238785423019701Fly ashGeopolymerPore structureSurface fractal dimension |
| spellingShingle | Yiwei Yang Bowen Wang Qiaoming Yuan Dunwen Huang Hui Peng Characterization, factors, and fractal dimension of pore structure of fly ash-based geopolymers Journal of Materials Research and Technology Fly ash Geopolymer Pore structure Surface fractal dimension |
| title | Characterization, factors, and fractal dimension of pore structure of fly ash-based geopolymers |
| title_full | Characterization, factors, and fractal dimension of pore structure of fly ash-based geopolymers |
| title_fullStr | Characterization, factors, and fractal dimension of pore structure of fly ash-based geopolymers |
| title_full_unstemmed | Characterization, factors, and fractal dimension of pore structure of fly ash-based geopolymers |
| title_short | Characterization, factors, and fractal dimension of pore structure of fly ash-based geopolymers |
| title_sort | characterization factors and fractal dimension of pore structure of fly ash based geopolymers |
| topic | Fly ash Geopolymer Pore structure Surface fractal dimension |
| url | http://www.sciencedirect.com/science/article/pii/S2238785423019701 |
| work_keys_str_mv | AT yiweiyang characterizationfactorsandfractaldimensionofporestructureofflyashbasedgeopolymers AT bowenwang characterizationfactorsandfractaldimensionofporestructureofflyashbasedgeopolymers AT qiaomingyuan characterizationfactorsandfractaldimensionofporestructureofflyashbasedgeopolymers AT dunwenhuang characterizationfactorsandfractaldimensionofporestructureofflyashbasedgeopolymers AT huipeng characterizationfactorsandfractaldimensionofporestructureofflyashbasedgeopolymers |