| 硅烷改性混凝土防水和抗氯离子性能试验研究 |
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| 引用本文： | 张鹏,赵铁军,戴建国,郭平功,Wittmann F H.硅烷改性混凝土防水和抗氯离子性能试验研究[J].土木工程学报,2011(3):72-78. |
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| 作者姓名： | 张鹏 赵铁军 戴建国 郭平功 Wittmann F H |
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| 作者单位： | 青岛理工大学;香港理工大学;河南城建学院; |
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| 基金项目： | 国家973资助项目(2009CB623203); 国家自然科学基金(507390015,1008165); 山东省自然科学基金(ZR2009FQ014) |
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| 摘 要： | 通过中子成像试验、吸水试验和氯离子侵蚀试验,研究无裂缝和带裂缝情况下硅烷改性混凝土的防水和抗氯离子侵蚀性能。试验结果表明,中子成像能够清晰观测未掺硅烷试件的快速吸水过程,而掺加硅烷后在毛细孔隙壁上形成的憎水膜能够有效抑制液态水分侵入,中子成像观测不到肉眼可见的水分前锋,吸水量降为未掺硅烷时的13%,显示出良好的防水性能。硅烷在水泥基体中的水解缩合反应并不堵塞毛细孔隙,保持"可呼吸性"。未改性试件一旦开裂,水在瞬间充满裂缝继而向裂缝两侧入侵,而硅烷改性试件即使开裂宽度达0.3mm,也无明显水分运动,裂缝在0.1mm～0.4mm扩展时不削弱其整体防水效果。良好的防水性能决定了硅烷改性混凝土无论是在无裂缝还是带裂缝情况下都具有良好的抗氯离子侵蚀能力。掺加硅烷改性是提高混凝土材料防水和抗氯离子侵蚀能力,进而提高其耐久性的有效途径。
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| 关 键 词： | 硅烷 吸水 中子成像 氯离子侵蚀 裂缝 |
Experimental study of the water repellency and chloride resistance of modified concrete with silane |
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| Zhang Peng Zhao Tiejun Dai Jianguo Guo Pinggong Wittmann F H.Experimental study of the water repellency and chloride resistance of modified concrete with silane[J].China Civil Engineering Journal,2011(3):72-78. |
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| Authors: | Zhang Peng Zhao Tiejun Dai Jianguo Guo Pinggong Wittmann F H |
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| Affiliation: | Zhang Peng1 Zhao Tiejun1 Dai Jianguo2 Guo Pinggong3 Wittmann F H1 (1.Qingdao Technological University,Qingdao 266033,China,2.Hong Kong Polytechnic University,Hong Kong,3.Henan University of Urban Construction,Pingdingshan 467044,China) |
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| Abstract: | The water repellency and chloride resistance of modified concrete with silane without and with cracks have been investigated through neutron radiography test,water absorption test and chloride penetration test.The results indicate that the process of water penetration into mortar specimens without silane can be visualized distinctly by means of neutron radiography,while water in the modified mortar with silane cannot be observed by naked eyes.The hydrophobic films formed in the capillary pores from the adde... |
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| Keywords: | silane water absorption neutron radiography chloride penetration cracks |
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