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Brzozowski P, Strzałkowski J, Rychtowski P, et al. Effect of Nano-SiO. Materials (Basel). 2021;15(1)doi: 10.3390/ma15010166.
Brzozowski, P., Strzałkowski, J., Rychtowski, P., Wróbel, R., Tryba, B., & Horszczaruk, E. (2021). Effect of Nano-SiO. Materials (Basel, Switzerland), 15(1), . https://doi.org/10.3390/ma15010166
Brzozowski, Piotr, et al. "Effect of Nano-SiO." Materials (Basel, Switzerland) vol. 15,1 (2021). doi: https://doi.org/10.3390/ma15010166
Brzozowski P, Strzałkowski J, Rychtowski P, Wróbel R, Tryba B, Horszczaruk E. Effect of Nano-SiO. Materials (Basel). 2021 Dec 27;15(1). doi: 10.3390/ma15010166. PMID: 35009312; PMCID: PMC8745793.
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Materials (Basel). 2021 Dec 27;15(1). doi: 10.3390/ma15010166.

Effect of Nano-SiO.

Materials (Basel, Switzerland)

Piotr Brzozowski, Jarosław Strzałkowski, Piotr Rychtowski, Rafał Wróbel, Beata Tryba, Elżbieta Horszczaruk

Affiliations

  1. Department of Civil and Environmental Engineering, West Pomeranian University of Technology, Szczecin, al. Piastów 50a, 70-311 Szczecin, Poland.
  2. Department of Chemical Technology and Engineering, West Pomeranian University of Technology, Szczecin, ul. Pu?askiego 10, 70-322 Szczecin, Poland.

PMID: 35009312 PMCID: PMC8745793 DOI: 10.3390/ma15010166

Abstract

The aim of the research was to determine how the admixture of nanosilica affects the structure and mechanical performance of cement concrete exposed to high temperatures (200, 400, 600, and 800 °C). The structural tests were carried out on the cement paste and concrete using the methods of thermogravimetric analysis, mercury porosimetry, and scanning electron microscopy. The results show that despite the growth of the cement matrix's total porosity with an increasing amount of nanosilica, the resistance to high temperature improves. Such behavior is the result of not only the thermal characteristics of nanosilica itself but also of the porosity structure in the cement matrix and using the effective method of dispersing the nanostructures in concrete. The nanosilica densifies the structure of the concrete, limiting the number of the pores with diameters from 0.3 to 300 μm, which leads to limitation of the microcracks, particularly in the coarse aggregate-cement matrix contact zone. This phenomenon, in turn, diminishes the cracking of the specimens containing nanosilica at high temperatures and improves the mechanical strength.

Keywords: concrete; high temperature; mechanical properties; microstructure; nanosilica; porosity

References

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