ConcreteBridgesConcreteisthemost-usedconstructionmaterialforbridgesintheUnitedStates,,beginningin1949withhigh-strengthsteelwiresintheWalnutLaneBridgeinPhiladelphia,’s1994NationalBridgeInventorydata,from1950totheearly1990s,,spliced-girderspansreachedarecord100m(330ft).,closeto200segmentalconcretebridgeshavebeenbuiltorareunderconstruction,withspansupto240m(800ft).Lateinthe1970s,cable-,theSunshineSkywayBridgeinTampa,Florida,hadsetanewrecordforconcretebridges,withamainspanof365m(1,200ft).Thenextyear,theDamesPointBridgeinJacksonville,Florida,extendedtherecordto400m(1,300ft).HIGH-pressivestrengthsof34to41MPa(5,000to6,000psi).,pressivestrengthsupto70MPa(10,000psi).Forthefuture,-,owners,designers,contractors,pressive--performanceconcrete(HPC)pressivestrength(.,inprestressedgirders)pressivestrengthwithimproveddurability(.,incast-in-placebridgedecksandsubstructures).Thereisaneedtodevelopabetterunderstandingofalltheparametersthataffectdurability,suchasresistancetochemical,electrochemical,
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