Micromechanical characterization of γ-irradiated cement paste exposed to different relative humidity conditions
In this study, well-hydrated cement paste samples made from Portland cement CEM I-42.5R were gamma irradiated with a 200 TBq 60Co source, resulting in a total absorbed dose of 13.82MGy. During irradiation, the samples were stored under specific relative humidity (RH) conditions of 11 %, 33 %, 76 %,...
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| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Czech Technical University in Prague
2024-12-01
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| Series: | Acta Polytechnica CTU Proceedings |
| Subjects: | |
| Online Access: | https://ojs.cvut.cz/ojs/index.php/APP/article/view/10365 |
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| Summary: | In this study, well-hydrated cement paste samples made from Portland cement CEM I-42.5R were gamma irradiated with a 200 TBq 60Co source, resulting in a total absorbed dose of 13.82MGy. During irradiation, the samples were stored under specific relative humidity (RH) conditions of 11 %, 33 %, 76 %, 96 %, and water. Grid nanoindentation was performed on polished sample surfaces to assess the nanoindentation Young’s modulus of both irradiated and non-irradiated control samples. An increase in Young’s modulus by 9.3 % was observed for irradiated samples at low RH (11 %). Samples stored at medium RHs (33 %, 76 %) showed negligible differences in micromechanical properties. However, a significant decrease in Young’s modulus, approximately 15 %, was measured for samples stored at high RHs (96 %, water).
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| ISSN: | 2336-5382 |