| 粉煤灰抑制碱硅酸反应膨胀的机理研究 |
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| 引用本文： | 刘彬,邓敏,莫立武. 粉煤灰抑制碱硅酸反应膨胀的机理研究[J]. 混凝土, 2011, 0(9): 19-22. DOI: 10.3969/j.issn.1002-3550.2011.09.006 |
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| 作者姓名： | 刘彬 邓敏 莫立武 |
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| 作者单位： | 南京工业大学材料科学与工程学院材料化学工程国家重点实验室,江苏南京,210009 |
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| 基金项目： | 国家重点基础研究发展计划(2009CB623105) |
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| 摘 要： | 研究了粉煤灰对碱硅酸反应(ASR)膨胀的抑制规律,并用扫描电镜(SEM)和光学显微镜表征了集料的反应情况.采用高压装置提取孔溶液,并采用pH计和火焰光度计测试了孔溶液的pH值和K+、Na+浓度随复合水泥浆体初始组成和龄期的变化规律.结果表明:试件的宏观膨胀随集料反应程度的增加而增大.掺入粉煤灰降低了孔溶液的pH值和K+...
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| 关 键 词： | 碱硅酸反应 粉煤灰 孔溶液 抑制机理 |
Mechanism of fly ash on suppressing alkali-silica reaction expansion |
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| LIU Bin,DENG Min,MO Li-wu. Mechanism of fly ash on suppressing alkali-silica reaction expansion[J]. Concrete, 2011, 0(9): 19-22. DOI: 10.3969/j.issn.1002-3550.2011.09.006 |
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| Authors: | LIU Bin DENG Min MO Li-wu |
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| Affiliation: | LIU Bin,DENG Min,MO Li-wu (State Key Laboratory of Materials-Oriented Chemical Engineering,College of Materials Science and Engineering,Nanjing University of Technology,Nanjing 210009,China) |
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| Abstract: | The effect of fly ash on alkali-silica reaction expansion was investigated,SEM and optical microscope were used to analyse the reac-tion degree of the reactive aggregate.The pore solutions of cement pastes were extracted by high-pressure equipment.Flame photometer and pH meter were used to detect concentrations of K +,Na + and OH-ions in pore solutions.Results showed that macroscopic expansion increased with an increase of the reaction degree of aggregate.Partial replacement of portland cements by fly ash r... |
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| Keywords: | alkali-silica reaction(ASR) fly ash pore solution mechanism |
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