Determination of the amount of Ca(OH)2 in cement matrices
Comparison of the content of Ca(OH)2 in hardened cement matrices, which contains the additive SiO2 nanoparticles and in matrice without additives was performed by the method of thermogravimetric analysis. Alite portland cement «SsangYong» and «Denki» were used. Hydrothermal sol of «Geosil» was i...
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
OOO "CNT «NanoStroitelstvo»
2019-08-01
|
| Series: | Нанотехнологии в строительстве |
| Subjects: | |
| Online Access: | http://nanobuild.ru/en_EN/journal/Nanobuild-4-2019/415-432.pdf |
| _version_ | 1819241799284162560 |
|---|---|
| author | Potapov Vadim Vladimirovich Efimenko Yuriy Vasilyevich Gorev Denis Sergeevich |
| author_facet | Potapov Vadim Vladimirovich Efimenko Yuriy Vasilyevich Gorev Denis Sergeevich |
| author_sort | Potapov Vadim Vladimirovich |
| collection | DOAJ |
| description | Comparison of the content of Ca(OH)2 in hardened cement matrices, which contains the additive SiO2 nanoparticles
and in matrice without additives was performed by the method of thermogravimetric analysis. Alite portland cement «SsangYong»
and «Denki» were used. Hydrothermal sol of «Geosil» was introduced as an additive of nanoparticles of SiO2. The amount of introduced nano-SiO2 was from 1.15 to 1.74 wt.% in respect to cement consumption. Water-cement ratio was provided at the level of W/C = 0.39–0.26. The compensating amount of polycarboxylate SVC-5Neu was 0.2–0.77 wt. %. The Ca(OH)2
content was calculated from the mass loss of the cement matrice sample in the temperature range 460–510о C. It was determined that the sol «Geosil» additive reacts quickly with Ca(OH)2
(CH) in cement matrice, significantly (up to 40%) reducing its content. By the period of 24 h sol «Geosil» binds 750 [mg CaO /g SiO2 ] and continues to bind CH up to 100–700 days, to the value δCaO = 1300 [mg CaO /g SiO2 ]. The pozzolan binding reaction Ca(OH)2 with the formation of calcium hydrosilicates may be one of the mechanisms for increasing the strength of concrete when introducing SiO2 nanoparticles. |
| first_indexed | 2024-12-23T14:29:39Z |
| format | Article |
| id | doaj.art-c62b432bd8834dfbb774d7ef463ce90e |
| institution | Directory Open Access Journal |
| issn | 2075-8545 |
| language | English |
| last_indexed | 2024-12-23T14:29:39Z |
| publishDate | 2019-08-01 |
| publisher | OOO "CNT «NanoStroitelstvo» |
| record_format | Article |
| series | Нанотехнологии в строительстве |
| spelling | doaj.art-c62b432bd8834dfbb774d7ef463ce90e2022-12-21T17:43:32ZengOOO "CNT «NanoStroitelstvo»Нанотехнологии в строительстве2075-85452019-08-0111441543210.15828/2075-8545-2019-11-4-415-432Determination of the amount of Ca(OH)2 in cement matricesPotapov Vadim Vladimirovich0Efimenko Yuriy Vasilyevich1Gorev Denis Sergeevich2Doctor of Engineering, Professor, Chief Researcher, Research Geotechnological Center of Far Eastern Branch of Russian Academy of Sciences, vadim_p@inbox.ruPhD in Engineering, Head of the Center «Building Materials and Technologies» Far Eastern Research Institute of Construction, efimenko_yu_v@mail.ru PhD in Engineering, Senior Researcher, Research Geotechnological Center of Far Eastern Branch of Russian Academy of Sciences, denis.goreff2015@yandex.ru Comparison of the content of Ca(OH)2 in hardened cement matrices, which contains the additive SiO2 nanoparticles and in matrice without additives was performed by the method of thermogravimetric analysis. Alite portland cement «SsangYong» and «Denki» were used. Hydrothermal sol of «Geosil» was introduced as an additive of nanoparticles of SiO2. The amount of introduced nano-SiO2 was from 1.15 to 1.74 wt.% in respect to cement consumption. Water-cement ratio was provided at the level of W/C = 0.39–0.26. The compensating amount of polycarboxylate SVC-5Neu was 0.2–0.77 wt. %. The Ca(OH)2 content was calculated from the mass loss of the cement matrice sample in the temperature range 460–510о C. It was determined that the sol «Geosil» additive reacts quickly with Ca(OH)2 (CH) in cement matrice, significantly (up to 40%) reducing its content. By the period of 24 h sol «Geosil» binds 750 [mg CaO /g SiO2 ] and continues to bind CH up to 100–700 days, to the value δCaO = 1300 [mg CaO /g SiO2 ]. The pozzolan binding reaction Ca(OH)2 with the formation of calcium hydrosilicates may be one of the mechanisms for increasing the strength of concrete when introducing SiO2 nanoparticles.http://nanobuild.ru/en_EN/journal/Nanobuild-4-2019/415-432.pdfthermogravimetryamorphous nanosilicaportlanditecalcium silicate hydratestrength of concrete |
| spellingShingle | Potapov Vadim Vladimirovich Efimenko Yuriy Vasilyevich Gorev Denis Sergeevich Determination of the amount of Ca(OH)2 in cement matrices Нанотехнологии в строительстве thermogravimetry amorphous nanosilica portlandite calcium silicate hydrate strength of concrete |
| title | Determination of the amount of Ca(OH)2 in cement matrices |
| title_full | Determination of the amount of Ca(OH)2 in cement matrices |
| title_fullStr | Determination of the amount of Ca(OH)2 in cement matrices |
| title_full_unstemmed | Determination of the amount of Ca(OH)2 in cement matrices |
| title_short | Determination of the amount of Ca(OH)2 in cement matrices |
| title_sort | determination of the amount of ca oh 2 in cement matrices |
| topic | thermogravimetry amorphous nanosilica portlandite calcium silicate hydrate strength of concrete |
| url | http://nanobuild.ru/en_EN/journal/Nanobuild-4-2019/415-432.pdf |
| work_keys_str_mv | AT potapovvadimvladimirovich determinationoftheamountofcaoh2incementmatrices AT efimenkoyuriyvasilyevich determinationoftheamountofcaoh2incementmatrices AT gorevdenissergeevich determinationoftheamountofcaoh2incementmatrices |