| 纳米SiO_2对混凝土材料阻尼性能的改良研究 |
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| 引用本文： | 刘铁军,乔国富,邹笃建.纳米SiO_2对混凝土材料阻尼性能的改良研究[J].功能材料,2011,42(7). |
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| 作者姓名： | 刘铁军 乔国富 邹笃建 |
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| 作者单位： | 1. 哈尔滨工业大学深圳研究生院,广东深圳,518055
2. 哈尔滨工业大学土木工程学院,黑龙江哈尔滨,150001 |
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| 基金项目： | 国家自然科学基金面上资助项目(50878070),国家自然科学基金重点资助项目(50938001) |
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| 摘 要： | 利用自主开发的三点弯曲梁阻尼测试装置对不同掺量纳米SiO2混凝土的阻尼性能进行了测试,通过X射线衍射仪和扫描电镜研究了不同掺量纳米SiO2对混凝土微观结构的影响,并对其阻尼增强机理进行了初步探讨。结果表明纳米SiO2掺量为4%时混凝土材料的损耗因子最大,为素混凝土的2.41倍,综合考虑成本、流动性、强度和阻尼等因素确定纳米SiO2的最优掺量为3%;纳米SiO2掺入混凝土中后,与之发生二次水化反应,使得混凝土中六方板状Ca（OH）2晶粒数量减少;纳米SiO2对于混凝土的阻尼增强机理在于纳米SiO2的掺入使得混凝土材料的内接触面数量增多,在外力作用下使应力不均匀分布增加,从而提高了材料摩擦阻尼耗能的能力。
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| 关 键 词： | 阻尼比 损耗因子 纳米SiO2 微观结构 阻尼机理 |
Improving the damping ability by the addition of nano-SiO_2 to the concrete materials |
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| LIU Tie-jun,QIAO Guo-fu,ZOU Du-jian.Improving the damping ability by the addition of nano-SiO_2 to the concrete materials[J].Journal of Functional Materials,2011,42(7). |
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| Authors: | LIU Tie-jun QIAO Guo-fu ZOU Du-jian |
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| Affiliation: | LIU Tie-jun1,QIAO Guo-fu2,ZOU Du-jian1(1.Shenzhen Graduate School of Harbin Institute of Technology,Shenzhen 518055,China,2.School of Civil Engineering of Harbin Institute of Technology,Harbin 150001,China) |
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| Abstract: | Damping in structures is commonly provided by viscoelastic nonstructural materials.Due to the large volume of structural materials in a structure,the contribution of a structural material to damping can be substantial.In this paper,the experimental investigation on damping ability of concrete materials and its members with nano-SiO2 was carried out by the method of 3-point bending beam damping measurement and cantilever beam free vibration respectively.The microstructure of concrete mix with nano-SiO2 was o... |
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| Keywords: | damping ratio loss tangent nano-SiO2 microstructure damping mechanism |
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