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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:程龍申請學(xué)位級別: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性能方面都優(yōu)于普通混凝土,對其研究是一項(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)際中對于纖維摻量的把握也是人們關(guān)注的問題之一。本文針對長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