超声波检测混凝土结构抗冻性的方法研究

,1),2),,(,250013):,,,,,,,,,,:;;;:TG115.28:A:100026656(2002)0520196204STUDYONULTRASONICTESTINGOFFROSTRESISTANCEOFCONCRETESTRUCTURESLIUWei2dong,ZHANGDong2qin1),LIUSheng2li2),YANGXiao2feng,ZHANGLian2zhou(WaterResourcesResearchInstituteofShandongProvince,Jinan250013,China)Abstract:Onthebasisoftherelationbetweenthedynamicmodulusofelasticityandthevelocityofsurfacewavesinsolidstructure,thedynamicmodulusofelasticityinconcretefreeze2thawspecimenwastestedbyultrasonicwavemethod.Themoduluswascomparedwiththeonetestedbytraditionalresonancemethodtogettheinherentlaws.Theregressionequationsweresetupfordynamicmodulusforecastofconcreteelasticity,andtherelevantdynamicmodulusofelasticitywascalculatedbythevelocitymeasured,thenthefrostresistanceofaconcretestructurewasevaluatedbytheratioofdy2namicmodulusofelasticity.Preliminarytestshowedthatthemethodwasfeasibleanduptothebasiclawofconcretefreeze2thawcharacteristics.Itcouldrealizethedevelopmentfromspecimentestingtostructureinspection,andsupplyref2erenceforconcretedurabilitytest.Keywords:Ultrasonictesting;Concretestructure;Surfacewavevelocity;Frostresistance,,,,,,,:20022012171),2500142),250022,,,,[1],,,,,,69124520025NDTVol.24No.5May2002©1995-2004TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.,,,,,,,,,11.1Ed,[2],Ed,Ed=2(1+)3(0.87+1.12)2V2r(1)Vr,0.20.3=0.2,Ed=2.888V2r(2)=0.25,Ed1=2.954V2r(3)=0.3,Ed2=3.021V2r(4)P=V2rV2r0100%(5)1.21,,(P)(S)()(R),,2,,,1;,,,2;312,,12,,,(),,,50,100,150,200250mm,(X)(Y),,,,(1)22.1100mm100mm400mm,,,28d,GBJ821985,,,-17282,24h,,2550,,791:©1995-2004TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.2.2CTS245,,,,0.1s,50kHz,,DT24W()2.31,2,3,2,Vr,,,,013%,,,,(2)(1)33.1,,,,,,(),fEd=2l2fm2n2SJTn(6)mnJTnh/ld/l,J=ba312(lba,S=ab),mn=4.73,l/a=4(l=400mm,a=100mm),[3],=0.2,Tn1.40,Ed=3.392f2(7)=0.25,Tn1.41,Ed1=3.416f2(8)=0.3,Tn1.42,Ed2=3.441f2(9),[4],Ed=Ed,(2)(7)Vr=1.084f(10)(7),23.212EdEdVrf11)m/sGPa/%m/sGPa/%m/sGPa/%m/sGPa/%0221732.65100216631.161000228133.06100238436.1110050216131.0295.0211429.6895.225224732.0897.0234835.0397.0100213530.2893.0210529.4394.450221231.0994.0233334.5895.8150209129.0488.9208228.7992.4100219030.4792.2232734.4095.3200206128.1986.0208228.7992.4125217330.0090.7232634.3795.2250201226.8982.0203727.5688.4150216629.8190.2231233.9694.0275200026.5781.4203727.5688.4175214729.2988.6230433.7393.4300199326.3880.8203727.5688.4200212228.6186.5228733.2392.0:1),2.3103kg/m3;,2.2103kg/m3891:©1995-2004TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.21)HzGPa/%HzGPa/%HzGPa/%HzGPa/%0208733.98100203732.371000214834.43100223937.4110050203632.3495.2199030.8995.425211733.4497.1220736.3597.2100201331.6193.0198130.6294.650208632.4794.3219335.8995.9150197230.3489.3196029.9792.6100206631.8592.5218735.6995.4200194529.5186.9196029.9792.6125205031.3691.1218635.6695.3250190128.1983.0191928.7388.8150204431.1890.6217435.2794.3275189027.8782.0191928.7388.8175202730.6689.1216735.0493.7300188427.6981.5191928.7388.8200200429.9787.0215134.5392.3:1),2.3103kg/m3;,2.2103kg/m33EdEdEd3=0.996Ed3-1.183Ed5=0.999Ed5-1.338Ed4=0.988Ed4-0.819Ed6=0.999Ed6-1.28VrfVr3=1.102f3-83Vr5=1.105f5-93Vr4=1.092f4-59Vr6=1.103f6-85EdVrEd3=1.24510-5Vr31.924Ed5=1.25410-5Vr51.917Ed4=1.05810-5Vr41.944Ed6=1.14210-5Vr61.929EdVr,,33,,,0.999,(10);,,,,12,,,4,,,,,1,,;,,,,,,,:[1].[M].:,1996.[2].[J].,1996,21(3):264-269.[3].[M].:,1989.[4]R,I,,,.[M].:,1982.2002,,42237,991:©1995-2004TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.