混杂纤维混凝土高温后力学性能试验研究

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1、武汉理工大学硕士学位论文混杂纤维混凝土高温后力学性能试验研究姓名：程龙申请学位级别：硕士专业：桥梁与隧道工程指导教师：刘沐宇20070401纤维增韧的高性能混凝土在各个性能方面都优于普通混凝土，对其研究是一项综合性很强的领域，而抗高温性能的研究又涉及很多的影响因素，要进行深入的研究难度较大，且在工程实际中对于纤维掺量的把握也是人们关注的问题之一。本文针对长江隧道管片的混凝土材料进行了高温后的力学和超声波试验，取得了一些成果，并回归分析了高温后声速和强度之间的计算公式，提出较为有效的纤维掺量，为今后纤维增韧混凝土理论研究和工程应用提供参考。本文得到“2005

2、年武汉市重点科技攻关项目(20051002035)”资助关键词：混凝土；高温：纤维；力学性能IIIAbstractWuhanYangtzeRivetunnelisthefirsttunnelcrossingYangtzeRive，itconnectsWuhancitizensoftwosideswitlleachother,anditwillbecomeimportanttraffichingeofWuhancity．Therefore，thesecurityofWuhanYangtzeRivetunnelisconcernedbymillionsofpe

3、ople．However,舭isaseveresecurityproblemtotunnels．oncethefireoccuresandbringsaboutstructurecollapse，thelossoflivesandpropertieswouldbegreat．Inordertoimprovethefireresistance，concretesareincorporatedwithhybridfibres(10ngandshortfirbrecomposite)．Usingpropertychangemechanismoffibrestoi

4、mprovethepropertiesofconcretesisverynecessarytothestudyaboutpropetiesoffibreconcreteunderhi曲temperature．ThispaperisunderthesupportofWuhanYangtzeRivetunnelproject．Inthisinvestigation，concretematerialsoftunnellinersaretestedOnresidualmechanicalproperties．Concretesareincorporatedwith

5、polypropylenefibresandhybridfibres(polypropylenefibresandsteelfibres)respectively．Moreover,afterexposuretohi曲temperature，theeffectsofhybridfibreswhichincorporatedintoHPCareinvestigatedonresidualmechanicalpropertiesincludingcompressivestrengthandtensilesplittingstrength．Threehybrid

6、fibreconcreteswhicharemixedintodifferentcontentofsteelfibresareinvestigatedbothonmechanicalperformanceanddamagedegreeswitlltemperatureelevatedupfromnormalto800"C．Afteranalyzingtheresults，themainconclusionsareasfollows：1．Themechanicsperformanceofhybridfibresconcreteissystematically

7、studiedafterhi曲temperature，resultsshowthattheperformanceofconcretewhichincorporatedwithhybridfibresisobviouslysuperiorerthanPPfibresconcreteandNSC，itisrepresentedthatNSCistendtoexplosivespallingat400"C，butafterhi曲temperature，theexplosivespallingresistanceofhybridfibresconcreteisbe

8、Rer，it’Sintegralityiskeptwell，and