Damage Evolution and NOx Photocatalytic Degradation Performance of Nano-TiO<sub>2</sub> Concrete Under Freeze–Thaw Cycles
The internal pore structure of nano-TiO<sub>2</sub> concrete deteriorates gradually during freeze–thaw (F–T) cycles. The deterioration process can reveal the F–T damage mechanism and the deterioration law of photocatalytic performance. The evolution law of the pore structure of nano-TiO&...
Saved in:
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2024-11-01
|
| Series: | Buildings |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2075-5309/14/12/3763 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1846105482559750144 |
|---|---|
| author | Zongming Jia Yanru Zhao Hengmao Niu |
| author_facet | Zongming Jia Yanru Zhao Hengmao Niu |
| author_sort | Zongming Jia |
| collection | DOAJ |
| description | The internal pore structure of nano-TiO<sub>2</sub> concrete deteriorates gradually during freeze–thaw (F–T) cycles. The deterioration process can reveal the F–T damage mechanism and the deterioration law of photocatalytic performance. The evolution law of the pore structure of nano-TiO<sub>2</sub> concrete during F–T damage was investigated. Moreover, this paper defined the microscopic F–T damage factor based on porosity and fractal dimension. The results showed that a 2% dosage of nano–TiO<sub>2</sub> concrete had better frost resistance and lower porosity in this experiment. Its porosity only increased by 13.3% after 200 F–T cycles, which was much smaller than that of ordinary concrete. Furthermore, the presence of nano-TiO<sub>2</sub> enhanced the volume fractal dimension of concrete pores larger than 100 nm, increasing the complexity of the pore structure and contributing to improved frost resistance. F–T damage led to a decrease in the photocatalytic performance of nano–TiO<sub>2</sub> concrete. Still, it helped the nitrate on the surface of the concrete to dissolve and disappear more quickly under rainwater washout. Finally, a thermodynamic theory-based concrete F–T damage correction model was constructed, and the model was used to predict F–T damage values for some scholars. The results showed that the correlation between the model values and the experimental values was more than 0.95, which could accurately reflect the degree of F–T damage of concrete. In addition, a prediction model of photocatalytic NO reduction by nano-TiO<sub>2</sub> concrete based on microscopic damage factor was established. It provides a theoretical basis for the application of nano-TiO<sub>2</sub> concrete in the field of gas pollutant treatment. |
| format | Article |
| id | doaj-art-317b13d0d5364a05ab7cc9ff9d5b5029 |
| institution | Kabale University |
| issn | 2075-5309 |
| language | English |
| publishDate | 2024-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Buildings |
| spelling | doaj-art-317b13d0d5364a05ab7cc9ff9d5b50292024-12-27T14:15:15ZengMDPI AGBuildings2075-53092024-11-011412376310.3390/buildings14123763Damage Evolution and NOx Photocatalytic Degradation Performance of Nano-TiO<sub>2</sub> Concrete Under Freeze–Thaw CyclesZongming Jia0Yanru Zhao1Hengmao Niu2College of Science, Inner Mongolia University of Technology, Hohhot 010051, ChinaCollege of Civil Engineering, Inner Mongolia University of Technology, Hohhot 010051, ChinaSchool of Architectural Engineering and Surveying and Mapping, Inner Mongolia Technical College of Construction, Hohhot 010070, ChinaThe internal pore structure of nano-TiO<sub>2</sub> concrete deteriorates gradually during freeze–thaw (F–T) cycles. The deterioration process can reveal the F–T damage mechanism and the deterioration law of photocatalytic performance. The evolution law of the pore structure of nano-TiO<sub>2</sub> concrete during F–T damage was investigated. Moreover, this paper defined the microscopic F–T damage factor based on porosity and fractal dimension. The results showed that a 2% dosage of nano–TiO<sub>2</sub> concrete had better frost resistance and lower porosity in this experiment. Its porosity only increased by 13.3% after 200 F–T cycles, which was much smaller than that of ordinary concrete. Furthermore, the presence of nano-TiO<sub>2</sub> enhanced the volume fractal dimension of concrete pores larger than 100 nm, increasing the complexity of the pore structure and contributing to improved frost resistance. F–T damage led to a decrease in the photocatalytic performance of nano–TiO<sub>2</sub> concrete. Still, it helped the nitrate on the surface of the concrete to dissolve and disappear more quickly under rainwater washout. Finally, a thermodynamic theory-based concrete F–T damage correction model was constructed, and the model was used to predict F–T damage values for some scholars. The results showed that the correlation between the model values and the experimental values was more than 0.95, which could accurately reflect the degree of F–T damage of concrete. In addition, a prediction model of photocatalytic NO reduction by nano-TiO<sub>2</sub> concrete based on microscopic damage factor was established. It provides a theoretical basis for the application of nano-TiO<sub>2</sub> concrete in the field of gas pollutant treatment.https://www.mdpi.com/2075-5309/14/12/3763nano-TiO<sub>2</sub> concretefreeze–thaw (F–T)photocatalysisdamagemodel |
| spellingShingle | Zongming Jia Yanru Zhao Hengmao Niu Damage Evolution and NOx Photocatalytic Degradation Performance of Nano-TiO<sub>2</sub> Concrete Under Freeze–Thaw Cycles Buildings nano-TiO<sub>2</sub> concrete freeze–thaw (F–T) photocatalysis damage model |
| title | Damage Evolution and NOx Photocatalytic Degradation Performance of Nano-TiO<sub>2</sub> Concrete Under Freeze–Thaw Cycles |
| title_full | Damage Evolution and NOx Photocatalytic Degradation Performance of Nano-TiO<sub>2</sub> Concrete Under Freeze–Thaw Cycles |
| title_fullStr | Damage Evolution and NOx Photocatalytic Degradation Performance of Nano-TiO<sub>2</sub> Concrete Under Freeze–Thaw Cycles |
| title_full_unstemmed | Damage Evolution and NOx Photocatalytic Degradation Performance of Nano-TiO<sub>2</sub> Concrete Under Freeze–Thaw Cycles |
| title_short | Damage Evolution and NOx Photocatalytic Degradation Performance of Nano-TiO<sub>2</sub> Concrete Under Freeze–Thaw Cycles |
| title_sort | damage evolution and nox photocatalytic degradation performance of nano tio sub 2 sub concrete under freeze thaw cycles |
| topic | nano-TiO<sub>2</sub> concrete freeze–thaw (F–T) photocatalysis damage model |
| url | https://www.mdpi.com/2075-5309/14/12/3763 |
| work_keys_str_mv | AT zongmingjia damageevolutionandnoxphotocatalyticdegradationperformanceofnanotiosub2subconcreteunderfreezethawcycles AT yanruzhao damageevolutionandnoxphotocatalyticdegradationperformanceofnanotiosub2subconcreteunderfreezethawcycles AT hengmaoniu damageevolutionandnoxphotocatalyticdegradationperformanceofnanotiosub2subconcreteunderfreezethawcycles |