疲勞損傷和裂縫對(duì)混凝土耐久性的影響_第1頁(yè)
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1、東南大學(xué)碩士學(xué)位論文疲勞損傷和裂縫對(duì)混凝土耐久性的影響姓名：王晶申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：材料學(xué)指導(dǎo)教師：孫偉20080303東南大學(xué)碩士學(xué)位論文AbstractDuetolongtimeeroding，theperformanceofconcreteunderfatigueloadisdeterioratedandthusitwillbedes仃oyedbeforehandbecauseofthedeclineofdorabifityA

2、tpresentthedeteriorationtoconcretestructuredurabilitywhichwasinducedbythecombinedactionofsHessanderosion，hasbecomeahottopicinmaterialfieldMostconcretestructureisservingwithcracks，whicharechannelsforerosiveparticlesintoin

3、nerconcreteThiswillobviouslyshortentheservicelifeofeOUCTCteThereforetheinfluenceofcracksontheconcretedurabilityhascausedmoreendmoreattentionInthisthesis，theeffectofdifferentfatigueextentoutheconcretedarabilityisstudiedAl

4、ltheresultsarebased0ntheconstructionofSuTongBtidgeandtheblankmixproportionisinaccordancewiththefieldoneAndthentheinfluencesofflyashandaircontentaswellastheaddingofsteelfibersontheconcretepropertyarestudiedBesidesresearch

5、esabouttheeffectofcrackswitlIvariouscausesandwidths011thedumbilityofconcreteafecarriedoutsystematicallyDeterminationoffatiguedamagevariablesConcreteofvariousmixproportionsareloadedtodifferentstresslevelandthedevelopingru

6、leofs仃aininbendingfatigueprocessisstudiedTheratioofresidualstraintoultimatestrainatfatiguedestroyisdefmedasthedamageextentTheinfluenceoffatiguedamageoncongretedurabilityThisthesisismainlyaimedatthesecondfatiguestageandth

7、edeteriorationofconcreteswithdifferentdamageextentistheemphasisTheresultsindicatethatfatiguedamagecanobviouslyweakenConcrete’scarbonizationresistance，andthecarbonationdapthwillincreasewiththefatiguedamageaggravatingUnder

8、similardamageextentconcretewithhigheraircontent(5％)willsufferdeepercarbonizationdepththanthosewithloweraircontentSteelfiberconcretepossesoutstandingcarbonizationresistanceSimilarlythefrostresistanceofconcretewilldeterior

9、atewithaggravatedfatiguedamageWhenthefatiguedamagereaches40％therelativeelasticmodulusofhighaircontentconcretewilldropdramaticallyandhoweverthatofsteelfiberconcreteisfallingdownmoreslowlyBesides，fatiguedamagecandamagethei

10、mpermeabifityofconcltMtsamples，andincreasethediffusiontoellicientofcldorideinconcretestructuresEffectofcracksouconcrete’sdurabilityFatigueinducedCracksstatic10adinducedandplasticshrinkageinducedonesarenladeinmythesisSome

11、researches011thechangesofcarbonationdepthanddiffusiondepthofchloridearoundthecracksarccarriedoutItsindicatedthatboththedepthsareincreasedwimthecracksbroadeningHavingsimilarcracks(inwidth)inducedbystaticloadblankconcretew

12、illsufferhigherdepthsofcarbonationandchloridediffusion，comparedwithsteelfiberreinforcedconcreteThecrackswhichwereinducedbyearlyshrinkagewillshowlessinfluenceoffthedurabilityofconcretesolongastheyfifeproperlycuredinthelat

13、eragesTheadditionofsteelfiberswillpreventconcretecrackingOnthecarbonationendchloridediffusionshrinkageinducedcrackswillleadlowerdepthinsteelfibercoucretecomparedwithblankconcreteInfluencingmechanismoffatiguedamageonconcr

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