Microstructure modification of cement pastes using nanosilica
The paper describes modifications of cement paste mixtures using nanosilica to affect their physical and chemical properties. Cement pastes from Portland cement CEM I 42.5R with three different substitution ratios of nanosilica 1.5, 3 and 4.5 wt.%/cem. were examined. Micromechanical response and mic...
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| Format: | Article |
| Language: | English |
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Czech Technical University in Prague
2022-03-01
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| Series: | Acta Polytechnica CTU Proceedings |
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| Online Access: | https://ojs.cvut.cz/ojs/index.php/APP/article/view/8109 |
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| author | Daniel Ňachaj Jiří Němeček Jiří Němeček |
| author_facet | Daniel Ňachaj Jiří Němeček Jiří Němeček |
| author_sort | Daniel Ňachaj |
| collection | DOAJ |
| description | The paper describes modifications of cement paste mixtures using nanosilica to affect their physical and chemical properties. Cement pastes from Portland cement CEM I 42.5R with three different substitution ratios of nanosilica 1.5, 3 and 4.5 wt.%/cem. were examined. Micromechanical response and microstructure were characterized using nanoindentation, statistical deconvolution and scanning electron microscopy. About 400 locations were examined on each sample over 40,000 μm2 area. The results indicate an increase of C-S-H phases by 11 vol.% in samples with 4.5 wt.% nanosilica replacement compared to pure Portland cement paste. The increase in C-S-H phases volume was accompanied by the decrease in CH phases by approximately 11 vol.%. |
| format | Article |
| id | doaj-art-b2e6ff7cd4644f7da05c1fd06b3dc3a7 |
| institution | Kabale University |
| issn | 2336-5382 |
| language | English |
| publishDate | 2022-03-01 |
| publisher | Czech Technical University in Prague |
| record_format | Article |
| series | Acta Polytechnica CTU Proceedings |
| spelling | doaj-art-b2e6ff7cd4644f7da05c1fd06b3dc3a72025-08-20T03:38:39ZengCzech Technical University in PragueActa Polytechnica CTU Proceedings2336-53822022-03-013456–6256–6210.14311/APP.2022.34.00565349Microstructure modification of cement pastes using nanosilicaDaniel Ňachaj0Jiří Němeček1Jiří Němeček2Czech Technical University in Prague, Faculty of Civil Engineering, Department of Mechanics, Thákurova 7, 166 29 Prague 6, Czech RepublicCzech Technical University in Prague, Faculty of Civil Engineering, Department of Mechanics, Thákurova 7, 166 29 Prague 6, Czech RepublicCzech Technical University in Prague, Faculty of Civil Engineering, Department of Mechanics, Thákurova 7, 166 29 Prague 6, Czech RepublicThe paper describes modifications of cement paste mixtures using nanosilica to affect their physical and chemical properties. Cement pastes from Portland cement CEM I 42.5R with three different substitution ratios of nanosilica 1.5, 3 and 4.5 wt.%/cem. were examined. Micromechanical response and microstructure were characterized using nanoindentation, statistical deconvolution and scanning electron microscopy. About 400 locations were examined on each sample over 40,000 μm2 area. The results indicate an increase of C-S-H phases by 11 vol.% in samples with 4.5 wt.% nanosilica replacement compared to pure Portland cement paste. The increase in C-S-H phases volume was accompanied by the decrease in CH phases by approximately 11 vol.%.https://ojs.cvut.cz/ojs/index.php/APP/article/view/8109nanosilicananoindentationcement pastec-s-himage analysismicrostructure |
| spellingShingle | Daniel Ňachaj Jiří Němeček Jiří Němeček Microstructure modification of cement pastes using nanosilica Acta Polytechnica CTU Proceedings nanosilica nanoindentation cement paste c-s-h image analysis microstructure |
| title | Microstructure modification of cement pastes using nanosilica |
| title_full | Microstructure modification of cement pastes using nanosilica |
| title_fullStr | Microstructure modification of cement pastes using nanosilica |
| title_full_unstemmed | Microstructure modification of cement pastes using nanosilica |
| title_short | Microstructure modification of cement pastes using nanosilica |
| title_sort | microstructure modification of cement pastes using nanosilica |
| topic | nanosilica nanoindentation cement paste c-s-h image analysis microstructure |
| url | https://ojs.cvut.cz/ojs/index.php/APP/article/view/8109 |
| work_keys_str_mv | AT danielnachaj microstructuremodificationofcementpastesusingnanosilica AT jirinemecek microstructuremodificationofcementpastesusingnanosilica AT jirinemecek microstructuremodificationofcementpastesusingnanosilica |