石灰石粉對天然輕骨料混凝土力學性能及耐久性影響的研究.pdf

1、分類UD石Re類號TV4C69石灰石粉searchoL431粉對天然輕ntheInfLightweig申學學研指論文輕骨料混fluenceoghtAggre申請人：學科門類：學位專業(yè)研究方向：指導教師：文提交日混凝土力學ofMechaegateCo：張通：工學:水工結(jié)：水工新：申向東日期：二○學性能及nicsoncreteb通學結(jié)構(gòu)工程新材料東教授○一五年學校代碼學號及耐久性影DurabilyLimest年六月碼1012號201220影

2、響的研l(wèi)ityofNatone2906024研究aturalResearchonTheInfluenceofMechanicsDurabilityofNaturalLightweightAggregateConcretebyLimestoneAbstractNaturalpumicelightweightaggregateconcretehaveadvantagesonhighstrengthwithlightweightaseisma

3、ticperfmance，crackresistancefireresistance.Ithasbecomememesophisticatedthatmakeresearchoflightweightaggregateathomeabroad，italsohasbeenusedmemewidelyinengineering.Butitisurgencytosolvethatlookfthesuitableadmixturealongwi

4、ththeincreasingdemfmineralmixtureofconcretesresources.Limestonepowderisawasteintheproductionprocessofcoarseaggregatefineaggregate，ifitisdiscardedarbitrarily，notonlytheenvironmentpollutionbutalsoawasteofresources.Soitcana

5、lleviatetherealproblemthattheshtageofcommonadmixturestherisingpriceeffectivelywhenlimestonepowderusedasmineraladmixture，reducetheenvironmentalpressure.Thepapermixnewlightweightaggregateconcretethatmakes0%10%20%30%40%50%l

6、imestonepowerinsteadofthesameamountofsrespectively.Ithasaresearchonthecompressivestrengthoflightweightaggregateconcreteunderthecontentofdifferentlimestonepowderon3d7d14d28d60d90d120dthetensilestrengthon7d14d28d60d.Itfind

7、sthat30%isthebestaddingquantityoflimestoneaftercomparingthetestresultslimestonepowderAtthesametime，weanalysisthemicrostructureofthespecimenbymeansofSEMtostudytheinfluencefatherlyontheinternalstructureoflightweightaggrega

8、teconcretewhichmixlimestonepowder，besidesdiscussthemechanismwhentheyaredestroyed.Inaddition，thepaperhasatestonthemasslossdynamicmodulusofelasticityafter25times50times75times100times123times150times175times200times225time

9、s250timescirculationbyquickfreezingmethod，Indertohaveaninfluenceonfrostresistanceoflightweightaggregateconcretebylimestonepowder.ThenthemicroscopicmechanismofeachgroupspecimensareanalyzedbytheSEMafterfrozenthawedItfindst

10、hatitisveryunfavabletofrostresistanceoflightweightaggregateconcreteifaddtoomuchlimestonepowderthecontentofabout30%isbetter.Accdingtotheprincipleofultrasonicflawdetection，testingthetimewavevelocitytoestablishthetimedistan