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A platform for research: civil engineering, architecture and urbanism
Improving the frost-resistance performance of supersulfated cement by reducing the crystalline-to-gel ratio through the addition of nano-SiO2
https://orcid.org/0000-0002-5651-4938
https://orcid.org/0000-0001-9182-8556
Abstract The poor frost resistance of supersulfated cement (SSC) is of great concerns for its application. This research assessed the frost resistance performance of SSC with 1 wt.% and 3 wt.% cement clinker activator (C1 and C3) and explored the effects of nano-SiO2 (NS) (1 wt.% and 3 wt.%, N1 and N3) on the frost resistance of SSC through macro- and micro-evaluation on loss of the compressive strength/the mass/the relative dynamic elastic modulus and XRD/MIP/SEM. Results showed that the frost resistance of C1 sample was superior than those of C3 sample. The addition of NS enhanced the frost resistance of SSC: the maximum mass loss was reduced by about 92.8% and the maximum relative dynamic elastic modulus loss was decreased by about 34.6%. This could be ascribed to the change of the porous microstructure: the portion of micro-pores smaller than 20 nm increased and the microstructure was densified. Moreover, Moreover, NS changes the long needle-like crystalline phase (AFt) shape to a short rod-like shape, the latter of which was more tightly wrapped by the gel phase, leading to a more compact microstructure, and the detachment of AFt from gel matrix (would be introduced by the difference of their contraction/expansion rate under F-T cycles) could result in the poor performance of SSC, while this could be relieved by the reduction of the AFt-to-gel ratio as seen from the NS-added SSC sample.
Highlights Nano-SiO2 (1%) can improve the frost resistance of supersulfated cement (SSC). The compaction of the microstructure of SSC by Nano-SiO2 is the reason for the improvement of frost resistance. The crystalline AFt peels from the C-S-H gel and forms a fragile structure after freeze-thaw cycles. The poor frost resistance of SSC is related to the higher crystalline-to-gel ratio.
Improving the frost-resistance performance of supersulfated cement by reducing the crystalline-to-gel ratio through the addition of nano-SiO2
https://orcid.org/0000-0002-5651-4938
https://orcid.org/0000-0001-9182-8556
Abstract The poor frost resistance of supersulfated cement (SSC) is of great concerns for its application. This research assessed the frost resistance performance of SSC with 1 wt.% and 3 wt.% cement clinker activator (C1 and C3) and explored the effects of nano-SiO2 (NS) (1 wt.% and 3 wt.%, N1 and N3) on the frost resistance of SSC through macro- and micro-evaluation on loss of the compressive strength/the mass/the relative dynamic elastic modulus and XRD/MIP/SEM. Results showed that the frost resistance of C1 sample was superior than those of C3 sample. The addition of NS enhanced the frost resistance of SSC: the maximum mass loss was reduced by about 92.8% and the maximum relative dynamic elastic modulus loss was decreased by about 34.6%. This could be ascribed to the change of the porous microstructure: the portion of micro-pores smaller than 20 nm increased and the microstructure was densified. Moreover, Moreover, NS changes the long needle-like crystalline phase (AFt) shape to a short rod-like shape, the latter of which was more tightly wrapped by the gel phase, leading to a more compact microstructure, and the detachment of AFt from gel matrix (would be introduced by the difference of their contraction/expansion rate under F-T cycles) could result in the poor performance of SSC, while this could be relieved by the reduction of the AFt-to-gel ratio as seen from the NS-added SSC sample.
Highlights Nano-SiO2 (1%) can improve the frost resistance of supersulfated cement (SSC). The compaction of the microstructure of SSC by Nano-SiO2 is the reason for the improvement of frost resistance. The crystalline AFt peels from the C-S-H gel and forms a fragile structure after freeze-thaw cycles. The poor frost resistance of SSC is related to the higher crystalline-to-gel ratio.
Improving the frost-resistance performance of supersulfated cement by reducing the crystalline-to-gel ratio through the addition of nano-SiO2
https://orcid.org/0000-0002-5651-4938
https://orcid.org/0000-0001-9182-8556
Abstract The poor frost resistance of supersulfated cement (SSC) is of great concerns for its application. This research assessed the frost resistance performance of SSC with 1 wt.% and 3 wt.% cement clinker activator (C1 and C3) and explored the effects of nano-SiO2 (NS) (1 wt.% and 3 wt.%, N1 and N3) on the frost resistance of SSC through macro- and micro-evaluation on loss of the compressive strength/the mass/the relative dynamic elastic modulus and XRD/MIP/SEM. Results showed that the frost resistance of C1 sample was superior than those of C3 sample. The addition of NS enhanced the frost resistance of SSC: the maximum mass loss was reduced by about 92.8% and the maximum relative dynamic elastic modulus loss was decreased by about 34.6%. This could be ascribed to the change of the porous microstructure: the portion of micro-pores smaller than 20 nm increased and the microstructure was densified. Moreover, Moreover, NS changes the long needle-like crystalline phase (AFt) shape to a short rod-like shape, the latter of which was more tightly wrapped by the gel phase, leading to a more compact microstructure, and the detachment of AFt from gel matrix (would be introduced by the difference of their contraction/expansion rate under F-T cycles) could result in the poor performance of SSC, while this could be relieved by the reduction of the AFt-to-gel ratio as seen from the NS-added SSC sample.
Highlights Nano-SiO2 (1%) can improve the frost resistance of supersulfated cement (SSC). The compaction of the microstructure of SSC by Nano-SiO2 is the reason for the improvement of frost resistance. The crystalline AFt peels from the C-S-H gel and forms a fragile structure after freeze-thaw cycles. The poor frost resistance of SSC is related to the higher crystalline-to-gel ratio.
Improving the frost-resistance performance of supersulfated cement by reducing the crystalline-to-gel ratio through the addition of nano-SiO2
Wang, Ruoyu (author) / Li, Beibei (author) / Chen, Heng (author) / Li, Qinfei (author) / Huang, Yongbo (author) / Zhao, Piqi (author) / Tchakouté, Hervé Kouamo (author) / Mapesu, Pengou (author) / Hou, Pengkun (author) / Cheng, Xin (author)
2024-03-15
Article (Journal)
Electronic Resource
English
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