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页数:5页
时间:2019-02-04
《路用碾压混凝土稠度与配合比研究》由会员上传分享,免费在线阅读,更多相关内容在工程资料-天天文库。
1、2014年第1期(总第291期)混凝土实用技术Number1in2014(TotalNo.291)ConcretePRACTICALTECHNOLOGYdoi:10.3969/j.issn.1002-3550.2014.01.042路用碾压混凝土稠度与配合比研究1112梁思明,魏亚,张倩倩,封基良(1.清华大学土木工程系,北京100084;2.云南省交通运输厅工程质量监督局,云南昆明650214)摘要:提出一种新的碾压混凝土配合比设计方法以同时获得其最大干密度及合适稠度。首先研究了骨料级配、含水
2、量、砂率、水泥用量以及粉煤灰掺量对路用碾压混凝土稠度的影响,然后采用施压振动法确定碾压混凝土的干密度和含水率的关系,测试碾压混凝土的抗弯拉强度,最后综合确定碾压混凝土的配合比。研究结果表明:对于路用碾压混凝土,骨料级配、砂率及含水量是影响碾压混凝土稠度和压实度的主要因素。当骨料级配连续,混合料砂率为50%,水泥用量为骨料质量的15%,含水量约为所有干料质量的6%时,碾压混凝土改进的维勃时间(改进VC值)在工程要求的35~45s范围内,且压实度较大,所得到的抗弯拉强度能够满足农村公路的强度要求,因
3、此采用的新方法是有效可行的。关键词:碾压混凝土;稠度;配合比;抗弯拉强度;农村公路中图分类号:TU528.062文献标志码:A文章编号:1002-3550(2014)01-0150-05StudyontheconsistencyandmixtureproportioningofrollercompactedconcreteforpavementLIANGSiming1,WEIYa1,ZHANGQianqian1,FENGJiliang2(1.DepartmentofCivilEngineerin
4、g,TsinghuaUniversity,Beijing100084,China;2.EngineeringQualitySupervisionBureauofYunnanCommunicationsDepartment,Kunming650214,China)Abstract:Proposedanewmixdesignmethodtosimultaneouslyobtainmaximumdrydensityandsuitableconsistencyofrollercom-pactedconc
5、rete.Firstly,itinvestigatedtheinfluenceofaggregategradation,watercontent,fineaggregateratio,cementcontent,andthecontentofflyashontheconsistencyofrollercompactedconcrete(RCC);itestablishedtherelationbetweendrydensityandwatercon-tentbasedontheconsolida
6、tedmethodsbyvibrationunderasurchargemass;finally,ittestedtheflexuralstrengthanddeterminedthefinalmixtureproportionsynthetically.Theresearchresultsshowedthataggregategradation,fineaggregateratioandwatercontentwereprincipleinfluencingfactorsoftheconsis
7、tencyandthedegreeofcompactionofRCC.Whenaggregategradationwascontinuous,thefine-to-coarseaggregateratioofthemixturewas50%bymass,thecementdosagewas15%oftheaggregatemass,andthewatercontentwas6%ofthemassofthesumofallthedryingredients,themodifiedvebetime(
8、modifiedVCvalue)ofRCCfallswithintheacceptablerangeof35~45sinengineeringapplications,andtheRCCalsoexhibitedhighdegreeofcompaction,andcouldachievetheflexurestrengthre-quiredfortheruralroads.Therefore,thenewmethodiseffectiveandfeasible.Keywords:rollerco
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