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1、2012年第2期(總第268期)混凝土原材料及輔助物料Number2in2012(TotalNo.268)ConcreteMATER/ALANDADMINICLEdoi:10.3969/j.issn.1002—3550.2012.02.023阻銹劑對混凝土耐久性的影響研究秦憲明’,彭鵬飛,鄢禮傳、,李悅2(1.廈門市宏業(yè)工程建設(shè)技術(shù)有限公司,福建Nfl361000;2.北京工業(yè)大學(xué),北京lO0000)摘要:采用海水熱雨循環(huán)90次、海水浸泡90d2種試驗(yàn)條件對比研究了4種混凝土的強(qiáng)度、擴(kuò)散系數(shù)、電通量和鋼
2、筋腐蝕電位等性能變化。結(jié)果表明:經(jīng)熱雨循環(huán)90次試樣抗壓強(qiáng)度較海水浸泡90d的高,摻加阻銹劑降低混凝土試樣的強(qiáng)度;經(jīng)熱雨循環(huán)90次試樣擴(kuò)散系數(shù)較標(biāo)樣28d試樣提高,但電通量降低,海水浸泡90d試樣擴(kuò)散系數(shù)和電通量均較28d試樣降低,C30級試驗(yàn)擴(kuò)散系數(shù)和擴(kuò)散系數(shù)較C50級高,摻加阻銹劑提高混凝土試樣的擴(kuò)散系數(shù)和擴(kuò)散系數(shù);經(jīng)熱雨循環(huán)90次試樣內(nèi)鋼筋腐蝕電位較標(biāo)樣28d試樣降低,海水浸泡90d試樣內(nèi)鋼筋腐蝕電位較28d試樣降低,但高于熱雨循環(huán)90次試樣,C30級混凝土試樣鋼筋腐蝕電位下降幅度較大,個(gè)別試樣內(nèi)
3、鋼筋發(fā)生點(diǎn)蝕,摻加阻銹劑提高試樣內(nèi)鋼筋腐蝕電位。關(guān)鍵詞:熱雨試驗(yàn)箱;阻銹劑;耐久性中圖分類號:TU528.042,6文獻(xiàn)標(biāo)志碼:A文章編號:1002—3550(2012)02—0075—03StudyontheinfluenceofcorrosioninhibitoronconcretedurabilityQINXian-ruing~,PENGPeng-fei,YANLi—chuan,LIYue(1.XiamenHongyeProjectBuildingTechniqueCo.,Ltd.,Xiamen3
4、61000,China;2.BeijingUniversityofTechnology,Beijing100000,China)Abstract:Usingheatandseawatershowercycles90timesandseawaterimmersion90d,thestrength,diffusioncoeficient,F(xiàn)luxandcorrosionpotentialoffourconcretewerecomparativelystudied.Theresultsshowedthatco
5、mpressivestrengthsofsamplesby90timesheatandseawatershowercycleswerehigherthansamplesby90dseawaterimmersion;theaddingofcorrosioninhibitorcouldreducethestrengthsofconcretes;diffusioncoeficientsofsamplesby90timesheatandseawatershowercycleswerehigherthansamp
6、lescuredinstandardconditionfor28d,butflexeswerelower;diffusioncoeficientsandflexesofsamplesby90dseawaterimmersionwerebothlowerthansamplescuredinstandardconditionfor28d;theaddingofcorosioninhibitorcouldincreasethediffusioncoeficientsofconcrete;thecorrosio
7、npotentialofrebarofsamplesby90timesheatandseawatershowercycleswerelowerthansamplescuredinstandardconditionfor28d;thecorosionpotentialofrebarofsamplesby90dseawaterimmersionwerealsolowerthansamplescuredinstandardconditionfor28d.buthigherthansamplesby90time
8、sheatandseawatershowercycles;thecorrosionpotentialofrebarofconcretesofC30gradeby90timesheatandseawatershowercyclesweremuchlowerthanC50grade,andpiUingcouldbefoundontherebarofthat;addingofcorrosioninhibitorintoconcretecouldi