| Carbonation of low heat portland cement paste precured in water for different time |
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| 作者姓名： | Deping Chen Etsuo Sakai Masaki Daimon Yoko Ohba |
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| 作者单位： | [1]Civil and Environmental Engineering School, University of Science and Technology Beijing, Beijing 100083, China [2]Graduate School of Science and Engineering, Tokyo Institute of Technology, Tokyo 152-8552, Japan |
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| 基金项目： | This study was financially supported by the Ministry of Education, Culture, Sports, Science, and Technology, Japan. |
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| 摘 要： | The carbonation technique was applied to accelerate the hydration of low heat portland cement （LHC）. Before carbonation, the demoulded pastes were precured in water for 0, 2, 7, and 21 d, respectively. The results show that precuring time in water strongly influences the carbonation process. The phenolphthalein test indicates that the paste precured in water for a shorter time is more quickly carbonated than that for a longer time. The content of calcium hydroxide increases with increasing the precuring time in water, whereas, the amount of absorbed carbon dioxide changes contrarily. Scanning electron microscope （SEM） observation shows that portlandite always fills up big air bubbles in the paste during precuring in water, and the mercury intrusion porosimetry （MIP） results show that there are less large capillary pores in the paste precured in water for a longer time. It is found that the paste without precuring in water has more carbon dioxide absorption during curing in carbon dioxide atmosphere, and its total pore volume decreases remarkably with an increase in the carbonation time than that precured in water. X-ray diffraction （XRD） and Brunauer-Emmett-Teller （BET） surface area analyses indicate that the carbonate products are vaterite and calcite; CxSHy formed from carbonation has low BET surface area in comparison with that of C-S-H formed from curing in water.
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| 关 键 词： | 低热波特兰水泥浆 水中预固化时间 碳酸化作用 气孔分布 |
| 收稿时间： | 2006-06-01 |
Carbonation of low heat portland cement paste precured in water for different time |
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| Deping Chen Etsuo Sakai Masaki Daimon Yoko Ohba.Carbonation of low heat portland cement paste precured in water for different time[J].Journal of University of Science and Technology Beijing,2007,14(2):178-184. |
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| Authors: | Deping Chen Etsuo Sakai Masaki Daimon Yoko Ohba |
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| Affiliation: | aCivil and Environmental Engineering School, University of Science and Technology Beijing, Beijing 100083, China;bGraduate School of Science and Engineering, Tokyo Institute of Technology, Tokyo 152–8552, Japan |
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| Abstract: | The carbonation technique was applied to accelerate the hydration of low heat portland cement (LHC). Before carbonation, the demoulded pastes were precured in water for 0, 2, 7, and 21 d, respectively. The results show that precuring time in water strongly influences the carbonation process. The phenolphthalein test indicates that the paste precured in water for a shorter time is more quickly carbonated than that for a longer time. The content of calcium hydroxide increases with increasing the precuring time in water, whereas, the amount of absorbed carbon dioxide changes contrarily. Scanning electron microscope (SEM) observation shows that portlandite always fills up big air bubbles in the paste during precuring in water, and the mercury intrusion porosimetry (MIP) results show that there are less large capillary pores in the paste precured in water for a longer time. It is found that the paste without precuring in water has more carbon dioxide absorption during curing in carbon dioxide atmosphere, and its total pore volume decreases remarkably with an increase in the carbonation time than that precured in water. X-ray diffraction (XRD) and Brunauer-Emmett-Teller (BET) surface area analyses indicate that the carbonate products are vaterite and calcite; C_xSH_y formed from carbonation has low BET surface area in comparison with that of C-S-H formed from curing in water. |
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| Keywords: | carbonation carbon dioxide absorption vaterite BET surface area pore size distribution |
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