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1、CORROSION?AND?PRESTRESSED?CONCRETE?BRIDGESAdrian?T.?Ciolko,?P.E.1腐蝕和預(yù)應(yīng)力混凝土橋梁阿德里安·T.CiolkoP.E.1AbstractThe?impact?on?bridge?reliability,?of?prestressing?steel?deterioration?and?tendonrupture?created?by?corrosion?mechanisms,?is?much?more?critical?and?rapid?thanthat?of?any?other?component?of?
2、a?prestressed?concrete?bridge.Additionally,deterioration?of?embedded?prestressing?reinforcement?in?these?structures?may?notnecessarily?be?made?visible?through?manifestation?of?external?distress?in?theConcrete.摘要腐蝕機(jī)制引起預(yù)應(yīng)力鋼筋的惡化和斷裂，進(jìn)而對(duì)橋梁的可靠性產(chǎn)生影響，這比對(duì)預(yù)應(yīng)力混凝土橋的其他部分的影響更加嚴(yán)重，也更加迅速。此外，在這些結(jié)構(gòu)中，有粘結(jié)預(yù)應(yīng)力鋼筋
3、的惡化也不必要通過混凝土外部糟糕的狀況表現(xiàn)出來。Initiating?mechanisms?and?particular?forms?of?corrosion?affectingprestressed?concrete?structures?are?described?based?on?the?author’s?experience.These?degradation?mechanisms?include:?Chlorides?and?Corrosion?Concrete?Carbonation?Effects?Influence?of?Concrete?Cracking?
4、Electrochemical?(Macrocell)?and?Pitting?Corrosion?Stress?Corrosion?Cracking?and?Steel?Embrittlement?Fretting?Corrosion?Corrosion?and?Fatigue關(guān)于腐蝕影響預(yù)應(yīng)力混凝土結(jié)構(gòu)的最初機(jī)制和特定形式的描述是基于作者的經(jīng)驗(yàn)。這些退化機(jī)制包括：?氯化物和腐蝕?混凝土碳化影響?混凝土裂縫的影響?電化學(xué)(小區(qū))和孔蝕?應(yīng)力腐蝕開裂和鋼的脆斷?微動(dòng)腐蝕?腐蝕和疲勞Recently,?prestressed,?post-tensioned?concrete?
5、structures?have?beenthought?to?be?threatened?by?certain?premature?performance?impairmentsworldwide,?predominately?when?defects?were?present.These?problems?maycontinue?to?manifest?themselves.?Therefore,?corrosion?preventative?methods?andneed?for?scrutiny?during?construction?and?maintenance?
6、needs?will?be?described.For?existing?structures?experiencing?evidence?of?premature?distress,?the?authordiscusses?case-study?based?investigative?techniques?and?available?rehabilitationStrategies.最近，世界各地的預(yù)應(yīng)力、后張法預(yù)應(yīng)力混凝土結(jié)構(gòu)已經(jīng)被認(rèn)為受到某些早期性能破壞的威脅，尤其是已經(jīng)存在的缺陷。這些問題可能繼續(xù)危害結(jié)構(gòu)。因此，我將對(duì)預(yù)防腐蝕的方法和施工與維護(hù)期間的檢測進(jìn)行介紹。對(duì)
7、于遭受早期破壞的現(xiàn)有結(jié)構(gòu)，作者討論案例研究是基于探測技術(shù)和有效的修復(fù)手段。1??Vice?President,?Construction?Technology?Laboratories,?Inc.,?5400?Old?Orchard?Road,?Skokie,IL?60077.1Copyright?ASCE?2005Structures?2005Structures?Congress?2005IntroductionThe?first?prestressed?concrete?bridge?in?the?US?wa
