Effect of nano silica on freeze-thaw resistance of cement-fly ash mortars, cured in corrosive condition at different temperature
1
China Electric Power Research Institute, Beijing 100192, China
2
State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, P. R. China
Publication date: 2019-04-02
Cement Wapno Beton 24(2) 137-153 (2019)
KEYWORDS
ABSTRACT
In China, a large amount of electric transmission towers has been built across plateau frozen soil, where the foundation concrete serves under freeze-thaw and erosion condition, and conse- quently, the durability faces the tough challenges. In this study, the mortars were prepared based on cement, fly ash, and nano silica [NS], which were cured in chloride-sulfate solution for 90 days. The compressive strength, freeze-thaw resistance, pore structure, interfacial transition zone, and hydration products was investigated, and the improvement in freeze-thaw resistance by addition of NS was discussed. The results show that addition of NS can improve the freeze-thaw resistance, and increase in cur- ing temperature can also show improvement in freeze-thaw re- sistance. This effect can be explained by refine the pore structure and densify the microstructure of ITZ with the addition of NS. Furthermore, negative effect on freeze-thaw resistance can be found that being cured under chloride-sulfate condition, the for- mation of AFt would cause the volume expansion and cracking of concrete. Such results suggest that in the plateau frozen soil, it is better to cast concrete in summer, which would benefit the strength development of concrete and promote the freeze-thaw resistance.
ACKNOWLEDGEMENTS
Financial support from Science and Technology Project of State Grid Corporation of China “Key technology research on fabricated modules of converter station and transmission line tower foundation of ultra-high voltage direct current projects” [GCB17201700134] and Innovation Fund Project of China Electric Power Research Institute “Nano-self-dispersion technology and its mechanism for improving the performance of transmission line concrete” [GC83-18-001] are gratefully acknowledged. The help of phase and NMR analysis from Hongbo Tan’ groups in Wuhan University of Technology was also gratefully acknowledged.
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