混凝土二次搅拌工艺及机理研究

《混凝土二次搅拌工艺及机理研究》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。

1、分类号：THl210710-824119滚步太海博士学位论文混凝土二次搅拌工艺及机理研究导师姓名职称申请学位级别王卫中冯忠绪教授博士学科专业名称机械设计及理论论文提交日期2007年3月12日论文答辩日期2007年6月7日学位授予单位长安大学答辩委员会主席学位论文评阅人ResearchonConcreteSecondaryMixingTechnologyandMechanismAbstract：Atthepresenttime，theresearchesonconcretematerialsaremoreconcentratedinobjectss

2、uchasmaterialgraduation，materialperformanceandfreshconcretemoulding，butlessinthemixingprocess．Thecorrelatedstandardsallovertheworldonlytakethemacroscopichomogeneityoffreshconcreteastheevaluationcriterionforvaluingequipmentperformance，SOthattheeffectsandreturnsofimprovingconcr

3、etestructureandmechanicalpropertybymeansofchangingthetraditionalmixingtechnologyarenotrealized，andresultinsomeproblems，suchascementwasting，higherconsumption，noise，andseriouswearofequipments．Forsolvingtheseproblems，asecondarymixingtechnologyisputforwardandstudied．Firstly,theau

4、thorinthispaperanalyzedconcretemicroscopiccompositionanditse行ectsonconcreteperformance，findoutthatinterfacialtransitionalzoneistheweakestlinkamongconcretematrixes．Theeffectsoftraditionalmixingtechnologyonconcretemicroscopiccompositionandperformanceareftirtheranalyzed，andtheau

5、thorpointsoutthatthetraditionalmixingtechnologyisnotperfectenoughtoenhancethecement’Sdispersityandhydrationdegree，itcannotbalancethestrengthgradientoftheinterfacialtransitionalzoneamongconcreteeither,thenshowsthereasonsforusingsecondarymixingtechnology．Themacroscopicandmicros

6、copicmechanismsofsecondarymixingtechnologyanditse仃ectmechanismsonconcreteestablishmentareemphasislystudied，andtheauthorthinksthatthesecondarymixingtechnologyCanenhancethecement’Sdispersity,hydrationdegreeandbalancethestrengthgradientamongconcreteinterfacialtransitionalzonesim

7、ultaneously,compared谢mtraditionalmixingmethod，thisnewmethodcanmakeareversestrengthtrendamongtheinterfacialtransitionalzone，andintegrallyenhanceconcreteperformance．Basedontheoryanalysis，fourkindsofsecondarymixingprocessesaretestedtoachievetheirparametermatches，andcomparedwitht

8、hetraditionalmixingprocess．Theresultsindicatethatconcretemixingquali