地震对新浇混凝土细观结构及强度的影响
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摘要
对受6～9度地震烈度震动的混凝土表观和内部骨料界面进行了体视显微镜观测,得到新浇混凝土在遭受地震后试件的断面结构形貌,确认了混凝土内部缺陷情况;采用超声波同步测试混凝土受压破坏过程,获得试验力-变形关系曲线,对比了新浇注混凝土震后受压破坏性能与未震动的差异性;从混凝土结构组成及细观结构角度分析了内部缺陷对混凝土强度的影响,解释并验证了受6～9度地震烈度震动的混凝土经后期养护至28 d,其界面状况能够得到有效恢复的机理。
After observing the concrete shaken by the simulation of seismic station and aggregates interface by stereo microscope,structural morphology of the fresh concrete was obtained and its internal defects were confirmed;the load-deformation curve was gained through ultrasonic wave measurement;the differences between concrete property with vibration damage and without vibration damage were further analyzed;the influence of internal defects on concrete strength was studied from the perspective of concrete component elements and microstructure.It was demonstrated that after 28 days of maintenance,effective recovery mechanism of the interface of the concrete shaken by 6-9 magnitude quake was obtained.
After observing the concrete shaken by the simulation of seismic station and aggregates interface by stereo microscope,structural morphology of the fresh concrete was obtained and its internal defects were confirmed;the load-deformation curve was gained through ultrasonic wave measurement;the differences between concrete property with vibration damage and without vibration damage were further analyzed;the influence of internal defects on concrete strength was studied from the perspective of concrete component elements and microstructure.It was demonstrated that after 28 days of maintenance,effective recovery mechanism of the interface of the concrete shaken by 6-9 magnitude quake was obtained.
引文
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[2]陈肇元,钱稼茹.汶川地震建筑震害调查与灾后重建分析报告[R].北京:中国建筑工业出版社,2008:601-604.
[3]Liang Wenhao,Li Qiao,Gao Bo.The First Anniversary of Wen-chuan Earthquake Proceedings of International Conference onEarthquake Engineering[M].Chengdu:Southwest Jiaotong Uni-versity Press,2009.
[4]Li Guhua,Wei Jiandong,He Guangjie,et al.Investigation on thecompressive strength of fresh concrete after simulated earthquake[C]//The4th International Symposium on Lifetime Engineering ofCivil Infrastructure.Beijing:Science Press,2009:23-25.
[5]GB/T50081—2002普通混凝土力学性能试验方法标准[S].北京:中国建筑工业出版社,2003.
[6][美]P.KUMAR MEHTA.混凝土的结构、性能与材料[M].祝永年,沈威,陈志源,译.上海:同济大学出版社,1991:12-14,25-27.
[7]魏建东,李固华,何广杰,等.地震对新浇混凝土强度、钢筋握裹力的影响[R].成都:成都市质监站,西南交通大学,2009.
[8]高健章,蔡益超,張阿本,等.地震對已澆置混凝土影響之探討[R].台北:交通部台湾区国道新建工程局,2001.
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