混凝土裂缝深度的超声波检测方法研究

,(,200092):,,,:;;:TG115.28+5:A:100026656(2002)0120006203STUDYONULTRASONICTESTINGOFTHEDEPTHOFTHECRACKSINCONCRETESSHANGTao2ping,TONGShou2xing(NationalKeyLaboratoryofConcreteMaterialsResearch,TongjiUniversity,Shanghai200092,China)Abstract:Accordingtothetheoryofthereversionofinitialwavephaseinultrasonictestingofthedepthofthecracksinconcretes,themethodfordetectingcracksandestimatingtheirdepthwithpositivepulseswasputforward.Transduc2ersweredisposedsymmetricallyandasymmetricallytotestthedepthofcracksatthecriticalpointofthephasereversion,andtheexperimentalresultsweresatisfactory.Keywords:Ultrasonictesting;Crackdepth;Concrete(50cm)Tc2T0BS4408[1],,,BS4408,,1510cm[2]20cm,,CECS21:1990Tc2T0[3],4.3.1Ldcdc,,,,930cm,T0:2001201215,,1,,,TcT0dc[4,5]dc=LTcT02-1(1)L,,,T0;T0,,,T0,624120021NDTVol.24No.1Jan.2002©1995-2004TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.5,10,15,20,2530cm,2,T022.1,;,,35,Tc,()T0,(1)2.2,,,,33.1,11/cm/%/%9.34.07.213.85.54.617.22.11.022.00.945.626.08.512.0:(1)20cm,,(2),20cm,,,,,,(5mm),,,122.0cm,45.6%(3)20cm,,,,,,(20mm),,,,,,,,,,3.2,Ldc,180,,L,,,(+)90,Ldc,1a;(1b),,,90,1bACBAOCtg=OAOCBOC(a)(b)17:©1995-2004TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.tg=OCOBOAOC=OCOBOC=OAOBdc=L1L2,L1L22,,,,,2L1cmL2cmcmcm%5.516.19.39.41.112.515.613.814.01.49.832.017.217.72.918.628.522.023.04.515.845.726.026.93.5,:(1),,(2),,,[2],,S=1520cm,5cm,Tc2T0,,Tc2T0;,,,4(1)20cm,,(2)20cm,,,,20cm(3),,:[1]BS4408:1972,RecommendationsforNon2DestructiveMethodsofTestforConcrete[S].[2],.[J].,1998,1(3):287-290.[3]CECS21:1990,[S].[4].[M].:,1989.70-71.[5].[M].:,1988.148-150.2001123200125,,,200,,,,,,11,,,,,()8:©1995-2004TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.