基于PZT阻抗法的混凝土强度检测试验研究
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摘要
众所周知,强度是混凝土最主要的指标之一,加强混凝土质量监控和检测,保证混凝土质量,是建筑工程管理中的重要环节。然而,由于传统的立方块抗压强度试验的局限性,人们需要不断研究在原位检测条件下混凝土强度的非破损检测新方法。同时,为了适应当今快速施工的需要,利用早期强度预测混凝土后期强度也成为国内外工程学术界关注的重要课题。
本文首先概述了传统混凝土抗压强度检测方法的研究状况,并指出它们的不足和难以解决的问题,介绍了近年来混凝土抗压强度无损检测的新方法,论述了各种方法的国内外研究进展。随之介绍了PZT阻抗法用于结构强度检测的基本理论,论文最后给出了基于PZT阻抗法的28天龄期内混凝土立方块抗压强度检测试验及其分析结果,验证了PZT阻抗法应用于混凝土强度检测的可行性。
试验结果表明:在混凝土28天龄期内,PZT电导纳频谱曲线的峰值出现明显的漂移;随着混凝土龄期的增长,压电导纳曲线逐渐向峰值频率增大的方向移动;在混凝土8天龄期内,压电导纳曲线移动幅度较大,8天以后移动幅度相对较小。混凝土试块28天龄期内压电导纳的变化规律与破坏试验得到的混凝土立方块抗压强度的变化规律是一致的。分别利用导纳的实部和虚部建立了量化评价指标—均方差根指数对混凝土龄期内压电导纳进行分析,分析结果也呈现出与混凝土抗压强度一致的变化趋势。
作为一种新的检测方法,压电阻抗法还处于发展阶段,各项研究成果还不成熟,今后还需对压电阻抗法在其他类型混凝土以及在不同养护条件下的应用作更深入的研究。此外对将PZT埋入混凝土内部进行混凝土初凝前的强度监测作进一步的研究。
As known to all, the strength is one of the most important indicators of concrete. To strengthen concrete quality control and testing becomes an important part of building management. However, because of the limitations of the traditional cubes compression strength test, people continue to study on situ detection of structural concrete strength under different conditions using nondestructive testing method. Meanwhile, in order to meet the current needs of the rapid construction, predicting concrete late strength with early strength also becomes an important topic in academic fields.
This thesis first outlines the research of the traditional detection methods of the concrete compression strength, points out their deficiencies and the issue difficult to resolve, then introduces new methods of nondestructive testing of concrete compression strength, discusses the research progress of various methods. The basic theory of PZT impedance method for the detection of structural strength is shown followed. Finally, based on the experimental results and analysis of the concrete cubes compression strength testing during 28 days using PZT impedance method, the effectiveness of PZT impedance method applying to the concrete strength testing is verified.
Test results show that: the peak of PZT electric admittance spectrum curve turns out apparent drift during 28 days period. With the growth of age, piezoelectric admittance curve gradually moves on the direction of the peak frequency increased. Compared to the changes of the compression strength of concrete cubes in experiment, they have consistency, that is, the curve grows rapid before eight days, and then relative ease after eight days. When another parameter RMSD(root mean square deviation) is used to value the admittance of the real and imaginary parts, it also shows the same trend with the strength.
As a new detection method, piezoelectric impedance method is still in the development stage, and the researches are not ripe yet. The application of piezoelectric impedance method in other types of concrete and under different curing conditions needs more in-depth research in the future. In addition, the monitoring of concrete strength before the initial setting needs further study with the PZT embedded in the concrete.
本文首先概述了传统混凝土抗压强度检测方法的研究状况,并指出它们的不足和难以解决的问题,介绍了近年来混凝土抗压强度无损检测的新方法,论述了各种方法的国内外研究进展。随之介绍了PZT阻抗法用于结构强度检测的基本理论,论文最后给出了基于PZT阻抗法的28天龄期内混凝土立方块抗压强度检测试验及其分析结果,验证了PZT阻抗法应用于混凝土强度检测的可行性。
试验结果表明:在混凝土28天龄期内,PZT电导纳频谱曲线的峰值出现明显的漂移;随着混凝土龄期的增长,压电导纳曲线逐渐向峰值频率增大的方向移动;在混凝土8天龄期内,压电导纳曲线移动幅度较大,8天以后移动幅度相对较小。混凝土试块28天龄期内压电导纳的变化规律与破坏试验得到的混凝土立方块抗压强度的变化规律是一致的。分别利用导纳的实部和虚部建立了量化评价指标—均方差根指数对混凝土龄期内压电导纳进行分析,分析结果也呈现出与混凝土抗压强度一致的变化趋势。
作为一种新的检测方法,压电阻抗法还处于发展阶段,各项研究成果还不成熟,今后还需对压电阻抗法在其他类型混凝土以及在不同养护条件下的应用作更深入的研究。此外对将PZT埋入混凝土内部进行混凝土初凝前的强度监测作进一步的研究。
As known to all, the strength is one of the most important indicators of concrete. To strengthen concrete quality control and testing becomes an important part of building management. However, because of the limitations of the traditional cubes compression strength test, people continue to study on situ detection of structural concrete strength under different conditions using nondestructive testing method. Meanwhile, in order to meet the current needs of the rapid construction, predicting concrete late strength with early strength also becomes an important topic in academic fields.
This thesis first outlines the research of the traditional detection methods of the concrete compression strength, points out their deficiencies and the issue difficult to resolve, then introduces new methods of nondestructive testing of concrete compression strength, discusses the research progress of various methods. The basic theory of PZT impedance method for the detection of structural strength is shown followed. Finally, based on the experimental results and analysis of the concrete cubes compression strength testing during 28 days using PZT impedance method, the effectiveness of PZT impedance method applying to the concrete strength testing is verified.
Test results show that: the peak of PZT electric admittance spectrum curve turns out apparent drift during 28 days period. With the growth of age, piezoelectric admittance curve gradually moves on the direction of the peak frequency increased. Compared to the changes of the compression strength of concrete cubes in experiment, they have consistency, that is, the curve grows rapid before eight days, and then relative ease after eight days. When another parameter RMSD(root mean square deviation) is used to value the admittance of the real and imaginary parts, it also shows the same trend with the strength.
As a new detection method, piezoelectric impedance method is still in the development stage, and the researches are not ripe yet. The application of piezoelectric impedance method in other types of concrete and under different curing conditions needs more in-depth research in the future. In addition, the monitoring of concrete strength before the initial setting needs further study with the PZT embedded in the concrete.
引文
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[3]武欣慧.基于人工神经网络的普通混凝土强度预测的研究[硕士学位论文].呼和浩特:内蒙古农业大学, 2005
[4]国家建筑工程质量监督检验中心编.混凝土无损检测技术(第一版).北京:中国建材工业出版社. 1996. 30-50
[5]陈建伟.混凝土强度现场检测与评定方法研究[硕士学位论文].唐山:河北理工大学, 2006
[6] J.H. Bungey. The Testing of Concrete in Structures. Senior Lecture in Civil Engineering. University of Liverpool. Surrey University Press. 1989. 46
[7] NJ. Carino. Nondestructive Testing of Concrete: History and Challenges. Concrete Institute, Detroit, MI, 1994. 623-678
[8]李珂.商品混凝土强度非破损检测方法的研究[硕士学位论文].郑州:郑州大学, 2002
[9]解咏平.抗拉法检测混凝土强度新技术试验研究[硕士学位论文].唐山:河北理工大学, 2006
[10] Mori K, Spagnoli A. A new non-contacting non-destructive testing method for defect detection in concrete. NDT&E International, 2002(35): 399-406
[11] Gucunski N, Woods R D. Inversion of rayleigh wave dispersion curve for SASW test, 5th Int. Conf. on Soil Dyn. and Earthquake Engineering. 1991. 127-138
[12] Daniels D J. Introduction to subsurface radar. IEE proceeding, 1998, 133(4): 278-326
[13]谷伟,孙逸增,刘斌.高强混凝土回弹仪测强曲线研究.沈阳建筑工程学院学报,2002, 18(2): 91-93.
[14]缪群,李增选.高强混凝土的超声特性及检测标准问题探讨.混凝土, 2000, 11: 39-41
[15]阎继红,胡云昌,林志伸.回弹法和超声回弹综合法判定高温后混凝土抗压强度的试验研究.工业建筑, 2001, 31(12): 46-47,82.
[16]陈丽红,杨波,张科强.高温后混凝土强度的无损检测.混凝土, 2001, 1: 35-36.
[17]吕天启,赵国藩,林志申等.应用回弹超声法评定火灾高温静置混凝土抗压强度的试验研究.混凝土, 2002, 8: 21-23,32.
[18]申鲁.非破损法检测潮湿混凝土抗压强度试验研究[硕士学位论文].郑州:郑州大学, 2005
[19] Liang C, Sun F P, Rogers C A. An impedance method for dynamic analysis of active material system. IEEE Transactions of the ASME, 1994, 116(1): 120-128
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