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A platform for research: civil engineering, architecture and urbanism
Contribution of core/shell TiO2@SiO2 nanoparticles to the hydration of Portland cement
https://orcid.org/0000-0001-8570-8566
Highlights TiO2@SiO2 nanoparticles can better improve compressive strength of cement than nano-TiO2 did. Nano-TiO2 particles formed microscale agglomerates in the hardened cement matrix. TiO2@SiO2 can limit the agglomeration of TiO2 nanoparticles in cement matrix. TiO2@SiO2 nanoparticles resulted in a considerable improvement in the microstructure of cement matrix.
Abstract This paper presented the contribution of core/shell TiO2@SiO2 nanoparticles to the hydration properties of Portland cement and the contribution was compared with that of nano-TiO2. Both nanoparticles were used to partially replace cement at 1 wt%. The mechanical property and microstructure of the cement pastes were experimentally characterized using compressive strength and scanning electron microscope (SEM), respectively. Specially, thermodynamic modeling was also applied to predict the phase assemblages and calculate the corresponding volumes. The results showed that the paste with 1 wt% TiO2@SiO2 developed a much higher compressive strength than the paste with or without nano-TiO2 added at each curing age. Both SEM and mapping analyses showed that obvious agglomeration of nano-TiO2 could be observed in nano-TiO2 modified cement paste, which decreased its efficiency in the cement paste. However, nano-TiO2 was well distributed when TiO2@SiO2 was added because of its limiting effect on the agglomeration of nano-TiO2, further densifying the microstructure. The calculated hydrates volumes by thermodynamic modeling also indicated that TiO2@SiO2 would result in producing most hydrates of all the pastes, thus contributing to a denser microstructure and a much higher compressive strength development.
Contribution of core/shell TiO2@SiO2 nanoparticles to the hydration of Portland cement
https://orcid.org/0000-0001-8570-8566
Highlights TiO2@SiO2 nanoparticles can better improve compressive strength of cement than nano-TiO2 did. Nano-TiO2 particles formed microscale agglomerates in the hardened cement matrix. TiO2@SiO2 can limit the agglomeration of TiO2 nanoparticles in cement matrix. TiO2@SiO2 nanoparticles resulted in a considerable improvement in the microstructure of cement matrix.
Abstract This paper presented the contribution of core/shell TiO2@SiO2 nanoparticles to the hydration properties of Portland cement and the contribution was compared with that of nano-TiO2. Both nanoparticles were used to partially replace cement at 1 wt%. The mechanical property and microstructure of the cement pastes were experimentally characterized using compressive strength and scanning electron microscope (SEM), respectively. Specially, thermodynamic modeling was also applied to predict the phase assemblages and calculate the corresponding volumes. The results showed that the paste with 1 wt% TiO2@SiO2 developed a much higher compressive strength than the paste with or without nano-TiO2 added at each curing age. Both SEM and mapping analyses showed that obvious agglomeration of nano-TiO2 could be observed in nano-TiO2 modified cement paste, which decreased its efficiency in the cement paste. However, nano-TiO2 was well distributed when TiO2@SiO2 was added because of its limiting effect on the agglomeration of nano-TiO2, further densifying the microstructure. The calculated hydrates volumes by thermodynamic modeling also indicated that TiO2@SiO2 would result in producing most hydrates of all the pastes, thus contributing to a denser microstructure and a much higher compressive strength development.
Contribution of core/shell TiO2@SiO2 nanoparticles to the hydration of Portland cement
https://orcid.org/0000-0001-8570-8566
Highlights TiO2@SiO2 nanoparticles can better improve compressive strength of cement than nano-TiO2 did. Nano-TiO2 particles formed microscale agglomerates in the hardened cement matrix. TiO2@SiO2 can limit the agglomeration of TiO2 nanoparticles in cement matrix. TiO2@SiO2 nanoparticles resulted in a considerable improvement in the microstructure of cement matrix.
Abstract This paper presented the contribution of core/shell TiO2@SiO2 nanoparticles to the hydration properties of Portland cement and the contribution was compared with that of nano-TiO2. Both nanoparticles were used to partially replace cement at 1 wt%. The mechanical property and microstructure of the cement pastes were experimentally characterized using compressive strength and scanning electron microscope (SEM), respectively. Specially, thermodynamic modeling was also applied to predict the phase assemblages and calculate the corresponding volumes. The results showed that the paste with 1 wt% TiO2@SiO2 developed a much higher compressive strength than the paste with or without nano-TiO2 added at each curing age. Both SEM and mapping analyses showed that obvious agglomeration of nano-TiO2 could be observed in nano-TiO2 modified cement paste, which decreased its efficiency in the cement paste. However, nano-TiO2 was well distributed when TiO2@SiO2 was added because of its limiting effect on the agglomeration of nano-TiO2, further densifying the microstructure. The calculated hydrates volumes by thermodynamic modeling also indicated that TiO2@SiO2 would result in producing most hydrates of all the pastes, thus contributing to a denser microstructure and a much higher compressive strength development.
Contribution of core/shell TiO2@SiO2 nanoparticles to the hydration of Portland cement
Sun, Jinfeng (author) / Cao, Xiaoyin (author) / Xu, Zhipeng (author) / Yu, Zhuqing (author) / Zhang, Yu (author) / Hou, Guihua (author) / Shen, Xiaodong (author)
2019-10-01
Article (Journal)
Electronic Resource
English
Influence of core/shell TiO2@SiO2 nanoparticles on cement hydration
| British Library Online Contents | 2017
Influence of core/shell TiO2@SiO2 nanoparticles on cement hydration
| British Library Online Contents | 2017
Influence of core/shell TiO2@SiO2 nanoparticles on cement hydration
| British Library Online Contents | 2017
Chemically modified hydration of Portland cement
| TIBKAT | 1994
Heat of hydration of Portland cement
| Engineering Index Backfile | 1935