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1、strengthof1250meshmicrofinecementat28dayswasreduced22.16%comparewiththe3daysstrength.Theinternaltemperature,porosityandaverageporediameterofmicrofinecementpasteincreaseswithincreasingfineness.(2)Selectingtheflyash,slag,expansiveagents,dispersingagentsasregulatingmaterialtoim
2、provethepropertiesofmicrofinecement.Throughtheexperiment,drawthatthebleedingrate,settingtimewasincreasedwiththeincreasingofmineraladmixturecontent,viscosity,shrinkagerateandcompressivestrengthdecrease.Becauseofthedifferentexpansiveagent,thecompensatethedryshrinkageofmicrofin
3、ecementisalsodifferent.Andthedryingshrinkageofultrafinecementpastewasreducedwithincreasingsuperfineexpansivecontent.Bentonite,Mcereducedthebleedingrateofsuperfinecementpaste,andimprovethestabilityoftheslurry,butafterthemixedthesedispersanttheviscosityofslurrywasincreased.(3)
4、Select20%flyash,slag10%,expansiveagent10%(MgO-1,UEA),dispersant(bentonite5%,methylcelluloseether0.3%)tostudytheperformanceofthecompositegroutingmaterial.Theexperimentalresultsshowsthatthedryingshrinkageofthecompositematerialmicrofinecementgroutingmaterialwasreduced,theviscos
5、itywasincreased,andimprovedthelatestrengthofpuresuperfinecement.Thoughacomprehensivecomparativeanalysis,resultsshowthatwhenMC:FA:SL:UEA:Bentonite=70%:20%:10%:10%:5%,thecompositemicrofinecementgroutingmaterialhavebetterpropertiesonviscosity,fluidity,strength,dryingshrinkage,i
6、nternaltemperaturecomparedwith1250meshmicrofinecement.Inaddition,thecostofthecompositemicrofinecementgroutingmaterialwasdecreased.Keywords:microfinecement;bleedingrate;compressivestrength;dryingshrinkage;internaltemperature-IV-万方数据目录摘要........................................
7、.................................................................................IAbstract.........................................................................................................................III第一章绪论........................................................
8、........................................................11.1研究背景与选题意义......
