| 粉煤灰对水泥砂浆微结构性能的影响 |
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| 引用本文： | 张乃明.粉煤灰对水泥砂浆微结构性能的影响[J].石家庄铁路工程职业技术学院学报,2014(1):26-31. |
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| 作者姓名： | 张乃明 |
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| 作者单位： | 北京铁路局站房工程指挥部,北京100000 |
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| 摘 要： | 矿物掺合料如粉煤灰、矿渣等，能显著改善结构混凝土的耐久性，而得到普遍应用。从微观角度出发，采用压汞法（MIP）和X-CT断层扫描技术分析粉煤灰分别为10%、30%和50%对水泥基材料微结构的影响，进一步从氯离子传输角度分析掺合料对微结构改变的本质。压汞法的结果表明，粉煤灰掺量从10%到50%，水泥基材料的毛细孔和凝胶孔的体积率分别减少和增加，但总孔隙率在50%时出现增加；X-CT三维重构的结果显示，水泥基材料的微缺陷随着掺合料的增加而减少；氯离子传输的实验显示，含50%掺合料的试样，具有较大的传输系数，表明不适量的掺合料会降低水泥基材料的抗渗透性能。
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| 关 键 词： | 掺合料 压汞 X-CT 微结构 氯离子 |
Effect of Fly Ash on Microstructure Property of Cement Mortar |
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| Authors: | ZHANG Nai-ming |
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| Institution: | ZHANG Nai-ming (Beijing Railway Bureau Beijing 100000 China) |
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| Abstract: | Mineral admixture like fly ash and slag is applied widely because it can greatly improve the durability of the structure concrete. The Mercury Intrusion Pore method （MIP） and X-CT were employed to study the effect of binding materials with 10%, 30%and 50%fly ash on microstructure property of cement based materials, which further analyzes the affect of admixture to the microstructure property from the angle of chloride ion diffusion. Test result of MIP shows that volume fraction of capillary pore and gel pore in cement based materials decreased and increased with fly ash content from 10%~50%, total pore volume fraction of cement based materials increased with 50% of admixture. 3D reconfiguration result of X-CT indicates that micro-defect volume fraction of cement based materials decreased with increasing fly ash content. The Chloride ion penetration resistance of cement based materials decreased at 50 % content of admixture. |
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| Keywords: | Mineral admixture MIP X-CT microstructure chloride ion |
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