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1、武漢理工大學(xué)碩士學(xué)位論文混雜纖維混凝土高溫后力學(xué)性能試驗(yàn)研究姓名：程龍申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：橋梁與隧道工程指導(dǎo)教師：劉沐宇20070401纖維增韌的高性能混凝土在各個(gè)性能方面都優(yōu)于普通混凝土，對(duì)其研究是一項(xiàng)綜合性很強(qiáng)的領(lǐng)域，而抗高溫性能的研究又涉及很多的影響因素，要進(jìn)行深入的研究難度較大，且在工程實(shí)際中對(duì)于纖維摻量的把握也是人們關(guān)注的問(wèn)題之一。本文針對(duì)長(zhǎng)江隧道管片的混凝土材料進(jìn)行了高溫后的力學(xué)和超聲波試驗(yàn)，取得了一些成果，并回歸分析了高溫后聲速和強(qiáng)度之間的計(jì)算公式，提出較為有效的纖維摻量，為今后纖維增韌混凝土理論研究和工程應(yīng)用提供參考。本文得到“2005
2、年武漢市重點(diǎn)科技攻關(guān)項(xiàng)目(20051002035)”資助關(guān)鍵詞：混凝土；高溫：纖維；力學(xué)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
