Modification of concrete by hydrothermal nanosilica
The paper shows the possibility to use hydrothermal nanosilica as a modifying additive to increase the strength of concrete based on portland cement. The technology of obtaining hydrothermal nanosilica in the form of sols and nanopowders by ultrafiltration membrane concentration and cryochemical vac...
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| Format: | Article |
| Language: | English |
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OOO "CNT «NanoStroitelstvo»
2019-06-01
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| Series: | Нанотехнологии в строительстве |
| Subjects: | |
| Online Access: | http://nanobuild.ru/en_EN/journal/Nanobuild-3-2019/248-265.pdf |
| _version_ | 1818662243914481664 |
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| author | Vadim V. Potapov Yuriy V. Efimenko, Denis S. Gorev, |
| author_facet | Vadim V. Potapov Yuriy V. Efimenko, Denis S. Gorev, |
| author_sort | Vadim V. Potapov |
| collection | DOAJ |
| description | The paper shows the possibility to use hydrothermal nanosilica as a modifying additive to increase the strength of concrete based on portland cement. The technology of obtaining hydrothermal nanosilica in the form of sols and nanopowders by ultrafiltration membrane concentration and cryochemical vacuum sublimation is proposed. The results of increased strength of concrete under compression by the addition of hydrothermal nanosilica Sol are presented. The experiments were performed on highly mobile concretes (ST = 10–19 cm) on equal-moving mixtures with water-cement ratio W/C = 0.61–0.71 at a dose of SiO2 2 wt.% and the rate of superplasticizer polycarboxylate 0.95±0.05 mas.% by cement. At the initial stage of hardening when the age is 1 day, the increase in the compressive strength of concrete reached 90–128% compared to the control sample. At the age of 28 days the increase in strength was 40%. High chemisorption activity of hydrothermal nanopowder with respect to Ca(OH)2 was
determined in the experiment with lime medium. This indicates that the amorphous nanoadditive SiO2 , which has a high specific
surface area, causes the formation of high-strength hydrates of calcium silicates in the cement (lime) medium as a result of the
pozzolan reaction, and this causes an increase in the strength of concrete. |
| first_indexed | 2024-12-17T04:57:52Z |
| format | Article |
| id | doaj.art-28a99e606f99489eb0f0528fb323d187 |
| institution | Directory Open Access Journal |
| issn | 2075-8545 |
| language | English |
| last_indexed | 2024-12-17T04:57:52Z |
| publishDate | 2019-06-01 |
| publisher | OOO "CNT «NanoStroitelstvo» |
| record_format | Article |
| series | Нанотехнологии в строительстве |
| spelling | doaj.art-28a99e606f99489eb0f0528fb323d1872022-12-21T22:02:38ZengOOO "CNT «NanoStroitelstvo»Нанотехнологии в строительстве2075-85452019-06-0111324826510.15828/2075-8545-2019-11-3-248-265Modification of concrete by hydrothermal nanosilicaVadim V. Potapov0Yuriy V. Efimenko,1Denis S. Gorev,2Research Geotechnological Center of Far Eastern Branch of Russian Academy of Sciences; Russia, Petropavlovsk-Kamchatsky, Chief Researcher; vadim_p@inbox.ru; Far Eastern Research Institute of Construction, Russia, Vladivostok, Head of the Center «Building Materials and Technologies», efimenko_yu_v@mail.ru;Research Geotechnological Center of Far Eastern Branch of Russian Academy of Sciences; Russia, Petropavlovsk-Kamchatsky, Senior Researcher; denis.goreff2015@yandex.ruThe paper shows the possibility to use hydrothermal nanosilica as a modifying additive to increase the strength of concrete based on portland cement. The technology of obtaining hydrothermal nanosilica in the form of sols and nanopowders by ultrafiltration membrane concentration and cryochemical vacuum sublimation is proposed. The results of increased strength of concrete under compression by the addition of hydrothermal nanosilica Sol are presented. The experiments were performed on highly mobile concretes (ST = 10–19 cm) on equal-moving mixtures with water-cement ratio W/C = 0.61–0.71 at a dose of SiO2 2 wt.% and the rate of superplasticizer polycarboxylate 0.95±0.05 mas.% by cement. At the initial stage of hardening when the age is 1 day, the increase in the compressive strength of concrete reached 90–128% compared to the control sample. At the age of 28 days the increase in strength was 40%. High chemisorption activity of hydrothermal nanopowder with respect to Ca(OH)2 was determined in the experiment with lime medium. This indicates that the amorphous nanoadditive SiO2 , which has a high specific surface area, causes the formation of high-strength hydrates of calcium silicates in the cement (lime) medium as a result of the pozzolan reaction, and this causes an increase in the strength of concrete.http://nanobuild.ru/en_EN/journal/Nanobuild-3-2019/248-265.pdfhydrothermal solutionsolnanopowdersilicachemisorption capacitypozzolan reactioncompressive strength of concrete. |
| spellingShingle | Vadim V. Potapov Yuriy V. Efimenko, Denis S. Gorev, Modification of concrete by hydrothermal nanosilica Нанотехнологии в строительстве hydrothermal solution sol nanopowder silica chemisorption capacity pozzolan reaction compressive strength of concrete. |
| title | Modification of concrete by hydrothermal nanosilica |
| title_full | Modification of concrete by hydrothermal nanosilica |
| title_fullStr | Modification of concrete by hydrothermal nanosilica |
| title_full_unstemmed | Modification of concrete by hydrothermal nanosilica |
| title_short | Modification of concrete by hydrothermal nanosilica |
| title_sort | modification of concrete by hydrothermal nanosilica |
| topic | hydrothermal solution sol nanopowder silica chemisorption capacity pozzolan reaction compressive strength of concrete. |
| url | http://nanobuild.ru/en_EN/journal/Nanobuild-3-2019/248-265.pdf |
| work_keys_str_mv | AT vadimvpotapov modificationofconcretebyhydrothermalnanosilica AT yuriyvefimenko modificationofconcretebyhydrothermalnanosilica AT denissgorev modificationofconcretebyhydrothermalnanosilica |