| A Comparative Study on the Pozzolanic Activity between Nano-SiO2 and Silica Fume |
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| 作者姓名： | YE Qing ZHANG Zenan SHENG Li CHEN Rongshen |
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| 作者单位： | [1]College of Civil Engineering, Zhejiang University of Technology, Hangzhou 310014, China [2]Department of Physics, Zhejiang University of Technology, Hangzhou 310014, China [3]College of Urban Building, Zhejiang Shuren University, Hangzhou 310015, China |
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| 基金项目： | Funded by the Center of Science Research, Zhejiang University of Technology of China. |
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| 摘 要： | The pozzolanic activity of nano-SiO2 and silica fume was comparatirely stndied by X-ray diffraction （ XRD ） , differential scanning calorimetry （DSC）, scanning electron micrascopy （SEM） and the compressive , bond and bending streugths of hardened paste and concrete were also measured. Results indicate that the compressive strength development of the paste made from Ca（OH）2 and nano-SiO2, the reaction rate of Ca（ OH）2 with nano- SiO2 and the velocity of C-S-H gel formation from Ca （ OH）2 with nano-SiO2 showed marked increases over those of Ca（ OH）2 with silica fume. Furthermore, the bond strength at the interface between aggregate and hardened cement paste, and the bending strength of concrete incorporated with 3% .NS increased more than those with SF, especially at early ages. To sum up, the pozzolanic activity of nano-SiO2 was much greater than that of silica fume. The results suggest that with a small amount of nano-SiO2, the Ca（ OH）2 crystal at the interface between hardened cement paste and aggregate at early ages may be effectively absorbed in high performance concrete.
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| 关 键 词： | 高性能混凝土 纳米二氧化硅 凝硬性 硅粉 氢氧化钙 |
| 收稿时间： | 2005-03-28 |
| 修稿时间： | 2006-06-03 |
A comparative study on the pozzolanic activity between nano-SiO2 and silica fume |
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| YE Qing ZHANG Zenan SHENG Li CHEN Rongshen.A Comparative Study on the Pozzolanic Activity between Nano-SiO2 and Silica Fume[J].Journal of Wuhan University of Technology. Materials Science Edition,2006,21(3):153-157. |
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| Authors: | Ye Qing Ph D Zhang Zenan Sheng Li Chen Rongshen |
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| Affiliation: | (1) College of Civil Engineering, Zhejiang University of Technology, 310014 Hangzhou, China;(2) Department of Physics, Zhejiang University of Technology, 310014 Hangzhou, China;(3) College of Urban Building, Zhejiang Shuren University, 310015 Hangzhou, China |
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| Abstract: | The pozzolanic activity of nano-SiO_2 and silica fume was comparatively studied by X-ray diffraction (XRD), differential scanning calorimetry (DSC), scanning electron microscopy (SEM) and the compressive, bond and bending strengths of hardened paste and concrete were also measured. Results indicate that the compressive strength development of the paste made from Ca(OH)_2 and nano-SiO_2, the reaction rate of Ca(OH)_2 with nano-SiO_2 and the velocity of C-S-H gel formation from Ca(OH)_2 with nano-SiO_2 showed marked increases over those of Ca(OH)_2 with silica fume. Furthermore, the bond strength at the interface between aggregate and hardened cement paste, and the bending strength of concrete incorporated with 3% NS increased more than those with SF, especially at early ages. To sum up, the pozzolanic activity of nano-SiO_2 was much greater than that of silica fume. The results suggest that with a small amount of nano-SiO_2,the Ca(OH)_2 crystal at the interface between hardened cement paste and aggregate at early ages may be effectively absorbed in high performance concrete. |
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| Keywords: | Ca(OH)2 interaction nano-SiO2 pozzolanic activity silica fume |
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