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ID:32442680
大小:1.17 MB
页数:6页
时间:2019-02-04
《海洋环境下玄武岩纤维布增强混凝土桥墩的耐久性试验研究》由会员上传分享,免费在线阅读,更多相关内容在工程资料-天天文库。
1、学兔兔www.xuetutu.com桥梁建设2014年第44卷第1期(总第224期)BridgeConstruction,Vo1.44,No.1,2014(TotallyNo.224)75文章编号:1003—4722(2014)01—0075一O6海洋环境下玄武岩纤维布增强混凝土桥墩的耐久性试验研究郭范波,徐岳,金辉,姜风华(1.长安大学公路学院,陕西西安‘710064;2.台州学院建筑工程学院,浙江台州318000)摘要:为研究海洋环境下玄武岩纤维布对混凝土桥墩耐久性的影响,用混凝土圆柱试件模拟桥墩,对其进行抗压试验。制作未包裹、3条带玄武岩纤维布包裹
2、的和全包裹的3种圆柱体混凝土试件,将试件和玄武岩纤维浸泡在5倍浓度海水中,每隔45d对试件进行抗压试验,并观察玄武岩纤维的表面形态。试验结果表明:相同腐蚀时间下,玄武岩纤维布包裹的试件的抗压强度比未包裹的大,且玄武岩纤维布全包裹的试件的防腐蚀性能优于3条带包裹的试件;在腐蚀初期,玄武岩纤维布包裹的试件的抗压强度降低率较小,随着腐蚀时间的增长,抗压强度降低率显著增大;玄武岩纤维布包裹的试件呈脆性破坏;玄武岩纤维在浸泡约90d出现腐蚀;包裹玄武岩纤维布能有效提高混凝土的耐久性能。关键词:桥墩;海洋环境;混凝土;玄武岩纤维布;加固;抗压强度;耐久性中图分类号:
3、U443.22;U445.57文献标志码:ATestStudyofDurabilityofConcretePierStrengthenwithBFRPSheetsinMarineEnvironmentGUOFan—bo~,XUYue,dINHui~,JIANGFeng—hua。(1.SchoolofHighway,ChanganUniversity,Xian710064,China;2Sehoo1of.CivilEngineeringandArchitecture,TaizhouUniversity,Taizhou318000,China)Abstrac
4、t:Tostudytheeffectofthebasaltfiberreinforcedpolymer(BFRP)sheetsonthedu—rabilityofconcretepierinmarineenvironment,thespecimensofconcretecylinderswereUSedtosimulatethepierandthecompressivetestsforthecylindersweremade.3typesofthespecimens0ftheconcretecylindersthatwerenotwrappedwitht
5、heBFRPsheet,wrappedwithonlv3piecesoftheBFRPsheetsandfullywrappedwiththeBFRPsheetwerepreparedandthespecimensandtheBFRPsheetsweredippedintheseawaterof5timesconcentration.Theeompressivetestsforthespecimensweremadeevery45dandthesurfacepattersoftheBFRPsheetswereobserved.Theresultsofth
6、etestsshowthatinthesamecorrosiontime,thecompressivestrengthofthespecimenswrappedwiththeBFRPsheetsisgreaterthanthatofthespecimennotwrappedwiththeBFRPsheetandtheanti—corrosioncapacityofthespecimenfullywrappedwiththeBFRPsheetissuperiortothatofthespecimenwrappedwith3piecesoftheBFRPsh
7、eets.Intheinitia1timeOfcorrosion,thereductionratesofthecompressivestrengthofthespecimenswrappedwithBFRPsheetsarelittle,however,withtheincreaseofthecorrosiontime,thereductionratesofthecompressivestrengthremarkablyincrease,thespecimenswrappedwithBFRPsheetspresentthebrittlefailurean
8、dtheBFRPsheetsbecomecorrodedabout90dafte
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