Effects of Gamma-Ray Irradiation on Hardened Cement Mortar
| Autor: | Yuliya Kaladkevich, Jiří Němeček, Daria Jóźwiak-Niedźwiedzka, Petr Štemberk, Eryk Pavalanski, Magdaléna Doleželová, Yuliia Khmurovska, Viktar Fatseyeu, Svyatoslav Sikorin |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Structural material porosity experiment nanoindentation Scanning electron microscope 0211 other engineering and technologies Ocean Engineering 02 engineering and technology Nanoindentation 021001 nanoscience & nanotechnology cement mortar Compressive strength Creep 021105 building & construction lcsh:Systems of building construction. Including fireproof construction concrete construction gamma-ray Irradiation drying Composite material 0210 nano-technology Porosity lcsh:TH1000-1725 Elastic modulus Civil and Structural Engineering |
| Zdroj: | International Journal of Concrete Structures and Materials International Journal of Concrete Structures and Materials, Vol 15, Iss 1, Pp 1-14 (2021) |
| ISSN: | 1976-0485 |
| DOI: | 10.1186/s40069-020-00452-7 |
| Popis: | The effect of gamma-ray irradiation on cement mortar properties is investigated in this study in order to understand the mechanism behind the strength and stiffness reduction, which may be significant according to the available researches. 60Co irradiation facility with the generating dose rate of 0.1–10 Gy/s and the total activity of 4.4·1015 Bq (120 kCi) was used to perform the irradiation, so that the total observed dose of the irradiated samples reached the values ranging from 12.0 to 15.0 MGy. An identical set of control samples was placed in the same laboratory conditions away from gamma radiation. The results of nanoindentation, X-ray diffraction analysis and mercury intrusion porosimetry of the irradiated and the control samples are shown and explained in detail in this study. The nanoindentation creep compliance and the nanoindentation elastic modulus of the irradiated and the control samples do not show any significant difference. The mineral composition obtained using the X-ray diffraction analysis of the irradiated and the control samples is also similar. The pore structure rearrangement and microcrack occurrence, which were evidenced by the mercury intrusion porosimetry and scanning electron microscopy, led to the porosity increase and may be attributed to the significant decrease of compressive strength. |
| Databáze: | OpenAIRE |
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