基于显微镜图像分析的振动作用下混凝土孔结构研究
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摘要
为探究振动对混凝土凝结过程中孔结构变化的影响,采用室内模拟车桥振动,通过设置两种不同振动试验参数(9 Hz,8 mm及5 Hz,4 mm),研究在混凝土不同凝结时间段振动对混凝土力学性能的影响程度,并利用显微镜图像分析技术对振动后混凝土孔结构的变化进行分析。研究表明:在混凝土初凝前施加较小频率和振幅(5 Hz,4 mm)的振动,能在一定程度减少孔面积比例与孔数,对混凝土后期强度有所提高;而较大振动频率和振幅(9 Hz,8mm)作用对混凝土结构有所影响,特别是初凝至终凝期间,较大振动作用会对混凝土结构产生破坏,产生一定裂隙,孔数有所增加,导致强度降低;混凝土强度与孔数和孔面积比例之间有较好的相关性,可通过孔数与孔面积比例反映混凝土强度。
In order to investigate the influence of vibration on the change of pore structure in the process of concrete condensation,the indoor simulation of vehicle-bridge vibration was carried out,and the influence of vibration in different concrete setting time on the mechanical properties of concrete was studied by setting different vibration test parameters. And the change of concrete pore structure after vibration was analyzed by using microscopic image analysis technology. The results show that: the pore area ratio and the number of pores decrease to some extent before applying the vibration with small vibration frequency and amplitude( 5 Hz,4 mm) during concrete initial setting period,which improves the later strength of concrete. The larger vibration frequency and amplitude( 9 Hz,8 mm) affect the concrete structure,especially from the initial setting period to the final setting period. The larger vibration will destroy the concrete structure,produce certain cracks,increase the number of holes and reduce the strength to a certain extent. There is a good correlation between the strength of concrete and the proportion of the number of holes and the area of holes. The strength of concrete can be reflected by the proportion of the number of holes and the area of holes.
In order to investigate the influence of vibration on the change of pore structure in the process of concrete condensation,the indoor simulation of vehicle-bridge vibration was carried out,and the influence of vibration in different concrete setting time on the mechanical properties of concrete was studied by setting different vibration test parameters. And the change of concrete pore structure after vibration was analyzed by using microscopic image analysis technology. The results show that: the pore area ratio and the number of pores decrease to some extent before applying the vibration with small vibration frequency and amplitude( 5 Hz,4 mm) during concrete initial setting period,which improves the later strength of concrete. The larger vibration frequency and amplitude( 9 Hz,8 mm) affect the concrete structure,especially from the initial setting period to the final setting period. The larger vibration will destroy the concrete structure,produce certain cracks,increase the number of holes and reduce the strength to a certain extent. There is a good correlation between the strength of concrete and the proportion of the number of holes and the area of holes. The strength of concrete can be reflected by the proportion of the number of holes and the area of holes.
引文
[1]李晓娟.列车振动对某隧道混凝土力学性能的影响及施工方案设计[J].施工技术,2012,41(4):58-60.LI Xiaojuan. Influence analysis of train vibration on mechanical properties of the concrete and construction scheme design at some tunnel[J]. Construction Technology,2012,41(4):58-60.
[2]张煜,潘传银,石雪飞.桥梁混凝土力学性能振动效应试验评估[J].结构工程师,2014,30(1):156-159.ZHANG Yu,PAN Chuanyin,SHI Xuefei. Experimental assessment of vibration effects on mechanical properties of concrete in bridges[J]. Structural Engineers,2014,30(1):156-159.
[3]KWAN A K H,ZHENG W,NG I Y T. Effects of shock vibration on concrete[J]. Aci Materials Journal,2005,102(6):405-413.
[4] MICHAEL R D,ADAM S R,JAMES H H. Effects of induced vibrations on early age concrete[J]. Journal of Performance of Constructed Facilities,2007,21(3):179-184.
[5]蒋正武,肖鑫,李文婷.车桥耦合振动对混凝土早期性能影响研究[J].混凝土世界,2015(1):88-95.JIANG Zhengwu,XIAO Xin,LI Wenting. Study on the influence of vehicle bridge coupling vibration on the early performance of concrete[J]. China Concrete,2015(1):88-95.
[6]蒋正武,任强,袁政成.车桥耦合振动对混凝土早期性能的影响及其损伤机理[J].建筑材料学报,2015,18(3):471-476.JIANG Zhengwu,REN Qiang,Yuan Zhengcheng. Effects of vehiclebridge coupled vibration on the early-age properties of concrete and its damage mechanism[J]. Journal of Building Materials,2015,18(3):471-476.
[7]张悦然,张永娟,张雄.混凝土凝结硬化阶段抗扰动性能研究[J].混凝土与水泥制品,2009(5):1-3.ZHANG Yueran,ZHANG Yongjuan,ZHANG Xiong. Study on the anti-disturbance of concrete in the setting and hardening period[J]. China Concrete and Cement Products,2009(5):1-3.
[8]彭军芝,彭小芹,桂苗苗,等.蒸压加气混凝土孔结构表征的图像分析方法[J].材料导报,2011,25(2):125-129.PENG Junzhi,PENG Xiaoqin,GUI Miaomiao,et al. Pore structure characterization of autoclaved aerated concrete using image analysis method[J]. Materials Review,2011,25(2):125-129.
[9]张雄,黄廷皓,张永娟,等.Image-pro Plus混凝土孔结构图像分析方法[J].建筑材料学报,2015,18(1):177-182.ZHANG Xiong,HUANG Tinghao,ZHANG Yongjuan,et al. Imagepro Plus analysis of pore structure of concrete[J].Journal of Building Materials,2015,18(1):177-182.
[10]陈贤瑞,卢都友,孙亚峰,等.图像分析法表征泡沫地质聚合物宏观孔结构[J].材料导报,2015,29(增刊2):113-117.CHEN Xianrui,LU Douyou,SUN Yafeng,et al. Characterization of macro pore structure of foam geopolymers by image analysis technology[J]. Materials Review,2015,29(Sup2):113-117.
[11]魏建军,邢娇秀,付智.行车荷载引起桥梁振动对修复混凝土性能影响[J].东南大学学报(自然科学版),2010,40(5):1058-1060.WEI Jianjun,XING Jiaoxiu,FU Zhi. Effect of traffic load induced bridge vibrations on concrete tensile properties[J]. Journal of Southeast University(Natural Science),2010,40(5):1058-1060.
[12]魏建军.行车荷载引起桥梁扰动对修复混凝土性能的影响[D].南京:东南大学,2013.WEI Jianjun. Effect of Traffic Load Induced Vibrations on Bridge Repaired Concrete[D]. Nanjing:Southeast University,2013.
[13]郑仁健,徐银芳,徐文胜,等.二次振动后混凝土强度变化规律的研究[J].华中科技大学学报(城市科学版),2004,21(1):69-72.ZHENG Renjian,XU Yinfang,XU Wensheng,et al. Study of strength of revibrating concrete[J]. Journal of Huazhong University of Science and Technology(Urban Science Edition),2004,21(1):69-72.
[14]韩海玲,李固华,魏建东,等.地震对新浇混凝土细观结构及强度的影响[J].重庆交通大学学报(自然科学版),2010,29(6):912-915.HAN Hailing,LI Guhua,WEI Jiandong,et al. Impact of earthquake on micro-structure and strength of fresh concrete[J]. Journal of Chongqing Jiaotong University(Natural Science),2010,29(6):912-915.
[2]张煜,潘传银,石雪飞.桥梁混凝土力学性能振动效应试验评估[J].结构工程师,2014,30(1):156-159.ZHANG Yu,PAN Chuanyin,SHI Xuefei. Experimental assessment of vibration effects on mechanical properties of concrete in bridges[J]. Structural Engineers,2014,30(1):156-159.
[3]KWAN A K H,ZHENG W,NG I Y T. Effects of shock vibration on concrete[J]. Aci Materials Journal,2005,102(6):405-413.
[4] MICHAEL R D,ADAM S R,JAMES H H. Effects of induced vibrations on early age concrete[J]. Journal of Performance of Constructed Facilities,2007,21(3):179-184.
[5]蒋正武,肖鑫,李文婷.车桥耦合振动对混凝土早期性能影响研究[J].混凝土世界,2015(1):88-95.JIANG Zhengwu,XIAO Xin,LI Wenting. Study on the influence of vehicle bridge coupling vibration on the early performance of concrete[J]. China Concrete,2015(1):88-95.
[6]蒋正武,任强,袁政成.车桥耦合振动对混凝土早期性能的影响及其损伤机理[J].建筑材料学报,2015,18(3):471-476.JIANG Zhengwu,REN Qiang,Yuan Zhengcheng. Effects of vehiclebridge coupled vibration on the early-age properties of concrete and its damage mechanism[J]. Journal of Building Materials,2015,18(3):471-476.
[7]张悦然,张永娟,张雄.混凝土凝结硬化阶段抗扰动性能研究[J].混凝土与水泥制品,2009(5):1-3.ZHANG Yueran,ZHANG Yongjuan,ZHANG Xiong. Study on the anti-disturbance of concrete in the setting and hardening period[J]. China Concrete and Cement Products,2009(5):1-3.
[8]彭军芝,彭小芹,桂苗苗,等.蒸压加气混凝土孔结构表征的图像分析方法[J].材料导报,2011,25(2):125-129.PENG Junzhi,PENG Xiaoqin,GUI Miaomiao,et al. Pore structure characterization of autoclaved aerated concrete using image analysis method[J]. Materials Review,2011,25(2):125-129.
[9]张雄,黄廷皓,张永娟,等.Image-pro Plus混凝土孔结构图像分析方法[J].建筑材料学报,2015,18(1):177-182.ZHANG Xiong,HUANG Tinghao,ZHANG Yongjuan,et al. Imagepro Plus analysis of pore structure of concrete[J].Journal of Building Materials,2015,18(1):177-182.
[10]陈贤瑞,卢都友,孙亚峰,等.图像分析法表征泡沫地质聚合物宏观孔结构[J].材料导报,2015,29(增刊2):113-117.CHEN Xianrui,LU Douyou,SUN Yafeng,et al. Characterization of macro pore structure of foam geopolymers by image analysis technology[J]. Materials Review,2015,29(Sup2):113-117.
[11]魏建军,邢娇秀,付智.行车荷载引起桥梁振动对修复混凝土性能影响[J].东南大学学报(自然科学版),2010,40(5):1058-1060.WEI Jianjun,XING Jiaoxiu,FU Zhi. Effect of traffic load induced bridge vibrations on concrete tensile properties[J]. Journal of Southeast University(Natural Science),2010,40(5):1058-1060.
[12]魏建军.行车荷载引起桥梁扰动对修复混凝土性能的影响[D].南京:东南大学,2013.WEI Jianjun. Effect of Traffic Load Induced Vibrations on Bridge Repaired Concrete[D]. Nanjing:Southeast University,2013.
[13]郑仁健,徐银芳,徐文胜,等.二次振动后混凝土强度变化规律的研究[J].华中科技大学学报(城市科学版),2004,21(1):69-72.ZHENG Renjian,XU Yinfang,XU Wensheng,et al. Study of strength of revibrating concrete[J]. Journal of Huazhong University of Science and Technology(Urban Science Edition),2004,21(1):69-72.
[14]韩海玲,李固华,魏建东,等.地震对新浇混凝土细观结构及强度的影响[J].重庆交通大学学报(自然科学版),2010,29(6):912-915.HAN Hailing,LI Guhua,WEI Jiandong,et al. Impact of earthquake on micro-structure and strength of fresh concrete[J]. Journal of Chongqing Jiaotong University(Natural Science),2010,29(6):912-915.