石灰石粉和應(yīng)力損傷對輕骨料混凝土性能的影響研究.pdf

1、Stu分類號TUDC石灰石udyonthontheTU528691石粉和應(yīng)heInfluePerfm申學科學科研究指導論文提交力損傷對nceofLimanceofL請人：科門類：科專業(yè)：究方向：導教師：交日期：對輕骨料混imestoneLightwei高矗工學結(jié)構(gòu)工混凝土申向東二〇一五混凝土性ePowderightAggr程耐久性教授五年六月學校代碼學號性能的影響StreregateCo1012920122060響研究essDamaon

2、crete002ageStudyontheInfluenceofLimestonePowderStressDamageonthePerfmanceofLightweightAggregateConcreteAbstractInthispapertheenrichednaturalpumiceinInnerMongoliaistakenascoarseaggregatefirstthenindustrialwastelimestonepo

3、wderisusedasadmixture.Meanwhiletheinternalmixingmethodisadoptedtoreplace0%10%20%30%40%ofcementmassbylimestonepowderfpreparinglightweightaggregateconcrete.Throughmechanicalperfmancetestfreezingthawingresistanceperfmancete

4、stwiththeaidofscanningelectronmicroscopeinternalmicrostructuresofconcretehavebeenanalyzedtoexpletheinfluencemechanismoflimestonepowderonthemechanicalperfmancedurabilityoflightweightaggregateconcretesoastoobtaintheappropr

5、iatemixcontentoflimestonepowderinpumicelightweightaggregateconcrete.Byanalyzingthestressstrainrelationshipoflightweightaggregateconcretewithdifferentlimestonepowdercontenttheconstitutiveequationswerebuilt.Thetestresultss

6、howthatwhenthemixcontentoflimestonepowderis10%themechanicalperfmanceoflightweightaggregateconcreteinallageswillbeimprovedsignificantlylimestonepowdercanaccelerateearlyhydrationofcementwhileitselfhaslaterhydrationactivity

7、toimprovethecompactnessofcementmatrixpumicecementinterfacetransitionzonetheinternalmixingof10%limestonepowdercaneffectivelyupgradethefreezingthawingresistanceperfmanceoflightweightaggregateconcreteintheearlystageoffreezi

8、ngthawingcyclewhiledegradethefreezingthawingresistanceperfmanceinthelatestageoffreezingthawingcycle.Secondlythroughrepeatedloadingofinitialstressdamagetolightweightaggregateconcreteprecastthe“quickfreezingmethod”isadopte

9、dwithrelativedynamicelasticmodulusmasslossrateasevaluationindicestoanalyzethefreezingthawingresistanceperfmanceoflightweightaggregateconcretewithdamagedegreesof00.050.120.190.27respectively.Withtheaidofscanningelectronmi

10、croscopy(SEM)themicrostructureacteristicsoflightweightaggregateconcretewithstressdamagehavebeenanalyzedpriposteritofreezingthawingsoastoexpletheinfluencemechanismofinitialstressdamageonthefreezingthawingresistanceperfman