大掺量矿渣粉—水泥基胶凝材料和混凝土性能与其优化的分析

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1、——些塑!AbstractAsthehydrationreactivityofblastfurnaceslag(BFS)islowcomparedwithcementclinker,blindlyincreasetheamountofblastfurnaceslagpowder(BFSP)willhaveanegativeimpactontheearlyagemechanicalpropertiesofcementitiousmaterialsandconcrete，whichlimitsthecontentofBFSPconstituti

2、ngPortlandcementinconcrete．Ontheotherhand，thegrindabilityofBFSisworsethancementclinker,SOit'sverydifficulttogetadesiredfinenesswhengroundtogether,whichfurtheraffectsthereactivityofBFSEBut，highvolumeBFSPconcretehasgotmoreandmoreattentioninconcreteconstructionallovertheworld

3、duetoitsexcellentdurabilityandtheenvironmentaladvantagesTheinfluencesofPortlandcementsubstitutedbyBFSPinahighproportionontheperformanceofcementitiousmaterialswerestudiedinthispaper．Forthelowerearlyagestrength，wechooseseveralactivatorsandselectedtheindustrywastecontainingsu

4、lfatewhichhasoptimumactivatingeffect．CompositecementitiousmaterialswhichCanmettherequirementofP．S42．5cementwhenthequantityofBFSPpowderreplacedPortlandcementby70％andthatofP'S32．5cementwhenthecontentofBFSPpowderisupto80％wereobtained．Otherperformanceofthecompositecementitious

5、materialsWasalsoexperimentallystudied，theresultsshowthatincreasingBFSPcontenthaslittleeffectonstandardconsistencywaterquantity,settingtimeandfluidity,besides，thecompositecementitiousmortarhavesmallshrinkageandgoodresistancetosulfateattack．Theexperimentalresultsstudiedonmec

6、hanicalpropertiesanddurabilityoftheIlAbstracthighvolumeBFSPconcreteandPortlandcementconcreteshowthatthehighvolumeBFSPconcretehasexcellentworkability．WhenthecontentofBFSPis50％．themechanicalpropertiesofBFSPconcreteareevenbetterthanPortlandcementconcreteFurthermore，hi曲volumeB

7、FSPconcretehasexcellentresimancetochlorideionpermeability,thepermeabilitycoefficientisaslowas29％-36％thatofPortlandCelllentconcrete．ThefrostresistanceofhighvolumeBFSPconcreteisequaltothatofPortlandcementconcretewhilethecarbonizationresistanceispoor．Reducingwatercementratiob

8、yaddingsuperplasticizerisoneoftheeffectivewaystoraisethecarbonizationresistanceofthehighB