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《纖維素纖維在南水北調(diào)中線沙河渡槽高強(qiáng)混凝土中的試驗(yàn)分析》由會(huì)員上傳分享,免費(fèi)在線閱讀,更多相關(guān)內(nèi)容在工程資料-天天文庫(kù)。
1、第1O卷第2期南水北調(diào)與水利科技Vo1.10No.22012年4月South_t曠NorthWaterDiversionandWaterScience&TechnologyApr.20126oi:10.3724/SP.J.1201.2012.02145纖維素纖維在南水北調(diào)中線沙河渡槽高強(qiáng)混凝土中的試驗(yàn)分析王斌(南水北調(diào)中線干線工程建設(shè)管理局河南直管建管局,鄭州450046)摘要:沙河渡槽是南水北調(diào)中線保證通水與否的重要控制工程,是目前采用預(yù)制工藝的單體自重最大的薄壁預(yù)應(yīng)力輸水構(gòu)件,對(duì)構(gòu)件的抗裂和強(qiáng)度及耐久性存在極高的要求。纖維素纖維是新興的復(fù)合纖維,屬于低彈模
2、級(jí)材料??梢源蠓岣呋炷良吧皾{的均質(zhì)性,有效抑制早期的塑性裂縫和干縮裂縫,同時(shí)改善混凝土的抗?jié)B性、抗凍融性及耐火性,最終達(dá)到提高混凝土的耐久性。通過(guò)現(xiàn)場(chǎng)在混凝土配合比中添加纖維素纖維的試驗(yàn),驗(yàn)證纖維素纖維對(duì)于高強(qiáng)度混凝土性能的影響和改善,挑選適合沙河渡槽預(yù)制槽體混凝土的纖維素纖維以及摻量,達(dá)到滿(mǎn)足設(shè)計(jì)要求,保證沙河渡槽的工程質(zhì)量。關(guān)鍵詞:沙河渡槽;纖維素纖維;試驗(yàn);混凝土性能;摻量;分析中圖分類(lèi)號(hào):TV68;TV431.3文獻(xiàn)標(biāo)識(shí)碼:A文章編號(hào):1672—1683(2012)02—0145-05TestAnalysisofCelluloseFiberinHi
3、gh-StrengthConcreteofShaheAqueductintheMiddleRouteoftheSouth‘to-NorthWaterDiversionProjectWANGBin(MiddleRouteProjectConstructionAdministrationofHenanStraightCWRA,Zhengzhou450046,China)Abstract:TheShaheaqueductisanimportantcontrollingengineeringfactortOensurewaterrunningintheMiddleRo
4、uteoftheSouth—to-NorthWaterDiversionProject,anditisathin-walledprestressedconveyancecomponentusingtheprefabricationwiththelargestsingleunitweight,whichhasahighrequirementforthecrackresistanceanddurabilityofthecomponent.Theeellu—losefiberisanewcompositefiberandamaterialwithlow-elasti
5、cmodulus.Thecellulosefibercanincreasethehomogeneityoftheconcreteandmortarsubstantially,inhibittheplasticcracksandshrinkagecracksoftheconcreteduringtheearlyperiod,im—provetheimpermeability,freeze-thawresistance,andfireresistanceoftheconcrete,andimprovethedurabilityofconcreteulti—mate
6、ly.Inthispaper,thein-situtestofaddingthecellulosefiberintotheconcreteisperformed,whichverifiestheimpactandimprovementofthecellulosefiberontheperformanceofhigh-strengthconcrete.Additionally,thecellulosefiberanditscontentaredeterminedtOsuittheprefabricatedtankconcreteoftheShaheaqueduc
7、tandtOmeetthedesignrequirementsinordertOen—suretheengineeringqualityoftheShaheaqueductproject.Keywords:Shaheaqueduct;cellulosefibers;test;performanceofconcrete;content;analysis沙河渡槽是南水北調(diào)中線干線工程沙河南一黃河南的1纖維素纖維應(yīng)用原因重要控制性工程,全長(zhǎng)11.938km;其中明渠長(zhǎng)2.8881km,建筑物長(zhǎng)9.05km。設(shè)計(jì)流量320m3/s,加大流量380沙河預(yù)應(yīng)力梁式渡槽是目
8、前國(guó)內(nèi)采用流水線預(yù)制方式≠s制作、架槽