SURFACE TREATMENT OF CONCRETE WITH TETRAETHYL ORTHOSILICATE, Na₂SiO₃ AND SILANE: COMPARISON OF THEIR EFFECTS ON DURABILITY
The surface treatment of existing concrete structures with silica-based organic and inorganic agents is often used to improve the durability of the structures, but their effects vary from each other, thus the recognition of their strengths and drawbacks could help to make good use of the techniques...
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| Format: | Article |
| Language: | English |
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University of Chemistry and Technology, Prague
2018-10-01
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| Series: | Ceramics-Silikáty |
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http://www.ceramics-silikaty.cz/index.php?page=cs_detail_doi&id=1231
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| _version_ | 1819058030744961024 |
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| author | Zhaoheng Guo Pengkun Hou Huang Shifeng Ning Xie Xin Cheng Singh L.P. Strokova Valeriya Nelyubova Viktoriya |
| author_facet | Zhaoheng Guo Pengkun Hou Huang Shifeng Ning Xie Xin Cheng Singh L.P. Strokova Valeriya Nelyubova Viktoriya |
| author_sort | Zhaoheng Guo |
| collection | DOAJ |
| description | The surface treatment of existing concrete structures with silica-based organic and inorganic agents is often used to improve the durability of the structures, but their effects vary from each other, thus the recognition of their strengths and drawbacks could help to make good use of the techniques under various environments. In this work, tetraethyl orthosilicate (TEOS), an organic precursor for manufacturing silica sol, together with other two normally used silica-based agents, Na₂SiO₃ and silane, was used for the surface treatment of concrete. Their effects on the durability were studied and compared by investigating the compressive strength, the water absorption rate, the carbonation, the chloride penetration and the sulfate attack of cement concrete samples. The results showed that TEOS decreased the transport properties of concrete significantly: reductions of 49.0% of the water absorption rate, 28.5% of the chloride ion penetration depth, and 20% of the carbonisation degree to that of the control sample were found, while the corresponding values of 42%/80%, 39%/71%, and 23%/10% of Na₂SiO₃/silane-treated samples were shown. The compressive strength and visual observation showed that the samples treated by TEOS exhibited the best performance for long term exposure in the 5 wt. % sodium sulfate solution when compared with silane-treated and Na₂SiO₃-treated samples. The variation of the in-situ Ca(OH)₂ consuming capability of the agents, as well as their effects on the hydration and hardening properties of the cement-based material could be ascribed to their differences in improving the durability. |
| first_indexed | 2024-12-21T13:48:43Z |
| format | Article |
| id | doaj.art-ce065406a93a470a89e730c7220a8d4e |
| institution | Directory Open Access Journal |
| issn | 0862-5468 1804-5847 |
| language | English |
| last_indexed | 2024-12-21T13:48:43Z |
| publishDate | 2018-10-01 |
| publisher | University of Chemistry and Technology, Prague |
| record_format | Article |
| series | Ceramics-Silikáty |
| spelling | doaj.art-ce065406a93a470a89e730c7220a8d4e2022-12-21T19:01:48ZengUniversity of Chemistry and Technology, PragueCeramics-Silikáty0862-54681804-58472018-10-0162433234110.13168/cs.2018.002910.13168/cs.2018.0029.20190121065558SURFACE TREATMENT OF CONCRETE WITH TETRAETHYL ORTHOSILICATE, Na₂SiO₃ AND SILANE: COMPARISON OF THEIR EFFECTS ON DURABILITYZhaoheng Guo0Pengkun Hou1Huang ShifengNing XieXin ChengSingh L.P.Strokova ValeriyaNelyubova Viktoriya Shandong Provincial Key Laboratory of Preparation and Measurement of Building Materials, University of Jinan, Jinan, Shandong, China, 250022 Shandong Provincial Key Laboratory of Preparation and Measurement of Building Materials, University of Jinan, Jinan, Shandong, China, 250022 The surface treatment of existing concrete structures with silica-based organic and inorganic agents is often used to improve the durability of the structures, but their effects vary from each other, thus the recognition of their strengths and drawbacks could help to make good use of the techniques under various environments. In this work, tetraethyl orthosilicate (TEOS), an organic precursor for manufacturing silica sol, together with other two normally used silica-based agents, Na₂SiO₃ and silane, was used for the surface treatment of concrete. Their effects on the durability were studied and compared by investigating the compressive strength, the water absorption rate, the carbonation, the chloride penetration and the sulfate attack of cement concrete samples. The results showed that TEOS decreased the transport properties of concrete significantly: reductions of 49.0% of the water absorption rate, 28.5% of the chloride ion penetration depth, and 20% of the carbonisation degree to that of the control sample were found, while the corresponding values of 42%/80%, 39%/71%, and 23%/10% of Na₂SiO₃/silane-treated samples were shown. The compressive strength and visual observation showed that the samples treated by TEOS exhibited the best performance for long term exposure in the 5 wt. % sodium sulfate solution when compared with silane-treated and Na₂SiO₃-treated samples. The variation of the in-situ Ca(OH)₂ consuming capability of the agents, as well as their effects on the hydration and hardening properties of the cement-based material could be ascribed to their differences in improving the durability. http://www.ceramics-silikaty.cz/index.php?page=cs_detail_doi&id=1231 Cement-based materials Durability Surface treatment TEOS |
| spellingShingle | Zhaoheng Guo Pengkun Hou Huang Shifeng Ning Xie Xin Cheng Singh L.P. Strokova Valeriya Nelyubova Viktoriya SURFACE TREATMENT OF CONCRETE WITH TETRAETHYL ORTHOSILICATE, Na₂SiO₃ AND SILANE: COMPARISON OF THEIR EFFECTS ON DURABILITY Ceramics-Silikáty Cement-based materials Durability Surface treatment TEOS |
| title | SURFACE TREATMENT OF CONCRETE WITH TETRAETHYL ORTHOSILICATE, Na₂SiO₃ AND SILANE: COMPARISON OF THEIR EFFECTS ON DURABILITY |
| title_full | SURFACE TREATMENT OF CONCRETE WITH TETRAETHYL ORTHOSILICATE, Na₂SiO₃ AND SILANE: COMPARISON OF THEIR EFFECTS ON DURABILITY |
| title_fullStr | SURFACE TREATMENT OF CONCRETE WITH TETRAETHYL ORTHOSILICATE, Na₂SiO₃ AND SILANE: COMPARISON OF THEIR EFFECTS ON DURABILITY |
| title_full_unstemmed | SURFACE TREATMENT OF CONCRETE WITH TETRAETHYL ORTHOSILICATE, Na₂SiO₃ AND SILANE: COMPARISON OF THEIR EFFECTS ON DURABILITY |
| title_short | SURFACE TREATMENT OF CONCRETE WITH TETRAETHYL ORTHOSILICATE, Na₂SiO₃ AND SILANE: COMPARISON OF THEIR EFFECTS ON DURABILITY |
| title_sort | surface treatment of concrete with tetraethyl orthosilicate na₂sio₃ and silane comparison of their effects on durability |
| topic | Cement-based materials Durability Surface treatment TEOS |
| url |
http://www.ceramics-silikaty.cz/index.php?page=cs_detail_doi&id=1231
|
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