Influence of exposure environments and moisture content on water repellency of surface impregnation of cement-based materials
Water repellent treatment is one of the effective means to improve the durability of concrete. This paper aims to investigate the water repellency of cement-based materials treated with silane-based water repellent agent under different exposure environments. Five different exposure conditions were...
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| Format: | Article |
| Language: | English |
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Elsevier
2020-11-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785420316537 |
| _version_ | 1818664509972152320 |
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| author | Jiuwen Bao Shuguo Li Peng Zhang Shanbin Xue Yifei Cui Tiejun Zhao |
| author_facet | Jiuwen Bao Shuguo Li Peng Zhang Shanbin Xue Yifei Cui Tiejun Zhao |
| author_sort | Jiuwen Bao |
| collection | DOAJ |
| description | Water repellent treatment is one of the effective means to improve the durability of concrete. This paper aims to investigate the water repellency of cement-based materials treated with silane-based water repellent agent under different exposure environments. Five different exposure conditions were applied in this experiment, namely, standard moist curing room, in-door laboratory atmosphere, pre-oven-dried condition, and out-door natural environment with or without shelter. Three different types of mortars with water-to-cement ratios of 0.4, 0.5 and 0.6 were prepared. And three different dosages (200, 400, 600 g/m2) of silane gel were utilized on the surface of specimens. The impregnation depth and water absorption after hydrophobic treatment have been measured. Results indicate that the initial moisture condition of mortar has a significant influence on the efficiency of surface silane impregnation. The depth of silane impregnation gradually decreases with the increase of initial moisture condition. The water repellency of surface impregnation of cement-based materials was well exhibited under the condition of about 50% relative humidity. It illustrated that the moisture within the cement-based materials affects the hydrolysis reaction process and the formation of hydrophobic membrane. Thus, the water repellency of cement-based materials greatly depends on the initial moisture content and the thickness of hydrophobic layer. |
| first_indexed | 2024-12-17T05:33:53Z |
| format | Article |
| id | doaj.art-99d07bd824064ffc8f82153979a5572f |
| institution | Directory Open Access Journal |
| issn | 2238-7854 |
| language | English |
| last_indexed | 2024-12-17T05:33:53Z |
| publishDate | 2020-11-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj.art-99d07bd824064ffc8f82153979a5572f2022-12-21T22:01:40ZengElsevierJournal of Materials Research and Technology2238-78542020-11-01961211512125Influence of exposure environments and moisture content on water repellency of surface impregnation of cement-based materialsJiuwen Bao0Shuguo Li1Peng Zhang2Shanbin Xue3Yifei Cui4Tiejun Zhao5Center for Durability & Sustainability Studies of Shandong Province, Qingdao University of Technology, Qingdao 266033, PR China; Research Center of Marine Environment Concrete Technology of Education Ministry, Qingdao University of Technology, Qingdao 266033, PR China; State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, PR ChinaCenter for Durability & Sustainability Studies of Shandong Province, Qingdao University of Technology, Qingdao 266033, PR China; Research Center of Marine Environment Concrete Technology of Education Ministry, Qingdao University of Technology, Qingdao 266033, PR ChinaCenter for Durability & Sustainability Studies of Shandong Province, Qingdao University of Technology, Qingdao 266033, PR China; Research Center of Marine Environment Concrete Technology of Education Ministry, Qingdao University of Technology, Qingdao 266033, PR China; Corresponding author.Center for Durability & Sustainability Studies of Shandong Province, Qingdao University of Technology, Qingdao 266033, PR China; Research Center of Marine Environment Concrete Technology of Education Ministry, Qingdao University of Technology, Qingdao 266033, PR ChinaCenter for Durability & Sustainability Studies of Shandong Province, Qingdao University of Technology, Qingdao 266033, PR China; Research Center of Marine Environment Concrete Technology of Education Ministry, Qingdao University of Technology, Qingdao 266033, PR ChinaCenter for Durability & Sustainability Studies of Shandong Province, Qingdao University of Technology, Qingdao 266033, PR China; Research Center of Marine Environment Concrete Technology of Education Ministry, Qingdao University of Technology, Qingdao 266033, PR ChinaWater repellent treatment is one of the effective means to improve the durability of concrete. This paper aims to investigate the water repellency of cement-based materials treated with silane-based water repellent agent under different exposure environments. Five different exposure conditions were applied in this experiment, namely, standard moist curing room, in-door laboratory atmosphere, pre-oven-dried condition, and out-door natural environment with or without shelter. Three different types of mortars with water-to-cement ratios of 0.4, 0.5 and 0.6 were prepared. And three different dosages (200, 400, 600 g/m2) of silane gel were utilized on the surface of specimens. The impregnation depth and water absorption after hydrophobic treatment have been measured. Results indicate that the initial moisture condition of mortar has a significant influence on the efficiency of surface silane impregnation. The depth of silane impregnation gradually decreases with the increase of initial moisture condition. The water repellency of surface impregnation of cement-based materials was well exhibited under the condition of about 50% relative humidity. It illustrated that the moisture within the cement-based materials affects the hydrolysis reaction process and the formation of hydrophobic membrane. Thus, the water repellency of cement-based materials greatly depends on the initial moisture content and the thickness of hydrophobic layer.http://www.sciencedirect.com/science/article/pii/S2238785420316537Exposure environmentMoisture conditionHydrophobic treatmentSurface impregnationWater absorption |
| spellingShingle | Jiuwen Bao Shuguo Li Peng Zhang Shanbin Xue Yifei Cui Tiejun Zhao Influence of exposure environments and moisture content on water repellency of surface impregnation of cement-based materials Journal of Materials Research and Technology Exposure environment Moisture condition Hydrophobic treatment Surface impregnation Water absorption |
| title | Influence of exposure environments and moisture content on water repellency of surface impregnation of cement-based materials |
| title_full | Influence of exposure environments and moisture content on water repellency of surface impregnation of cement-based materials |
| title_fullStr | Influence of exposure environments and moisture content on water repellency of surface impregnation of cement-based materials |
| title_full_unstemmed | Influence of exposure environments and moisture content on water repellency of surface impregnation of cement-based materials |
| title_short | Influence of exposure environments and moisture content on water repellency of surface impregnation of cement-based materials |
| title_sort | influence of exposure environments and moisture content on water repellency of surface impregnation of cement based materials |
| topic | Exposure environment Moisture condition Hydrophobic treatment Surface impregnation Water absorption |
| url | http://www.sciencedirect.com/science/article/pii/S2238785420316537 |
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