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1、判断某水泥样品是否属于合格品一、实验目的:通过水泥实验检验水泥质量和测定水泥物理力学性质指标,为配合比设计提供原始数据。同时评定水泥质量,对不合格水泥不能使用。Purpose:Totestthequalityofcementandcementexperimentaldeterminationofphysicalandmechanicalpropertiesofconcreteindicatorstoprovidetherawdatathanwiththedesign.Atthesametimeasse
2、ssingthequalityofcement,thecementcannotbeusedforunqualified.二、实验仪器:(1)水泥细度实验:①负压筛析仪;②天平:最大称量500g,感量0.01g。(2)水泥标准稠度用水量实验:①水泥标准稠度测定仪;②水泥净浆搅拌机;③天平:感量1g;④湿气养护箱、量筒等。(3)水泥凝结时间实验:将标准稠度实验的试锥换上试针,将锥模换成圆模。(4)水泥体积安定性实验:沸煮箱、雷氏夹(5)水泥胶砂强度实验:行星式胶砂搅拌机、胶砂振实台、胶砂试模、刮平直尺、抗
3、折实验机、抗压实验机。Laboratoryequipment:(1)Cementfinenessexperiment:①vacuumsieveanalyzer;②balance:Maximumweighing500g,asenseoftheamountof0.01g.(2)Cementstandardconsistencywaterexperiment:①normalconsistencyofcementanalyzer;②cementslurrymixer;③balance:1g;④moisture
4、conservationboxes,cylinders,etc.(3)Cementsettingtimeexperiment:thestandardconsistencyexperimentaltestpilotputtheneedlecone,conemoldreplacedtheroundmold.(4)Soundnessofcementexperiments:boilingtank,Reye'sclip(5)Cementmortarstrengthtest:Planetarymortarmixe
5、r,mortartapsets,mortartestmode,Calibratingruler,bendingtestingmachine,compressiontestingmachine.三、实验原理:水泥细度直接影响水泥的凝结时间、强度、水化热等技术性质,因此测定水泥的细度是否达到规范要求,对工程具有重要意义。水泥浆的稀稠对水泥的凝结时间、体积安定性等技术性质的实验影响很大。水泥凝结时间有初凝和终凝之分。凝结时间不合格的水泥视为废品。水泥体积安定性是指水泥在凝结硬化过程中体积变化的均匀性。水泥中
6、如果含有较多CaO,MgO,SO3,就能使体积发生不均匀变化。Principle:cementfinenessdirectlyaffectthetechnicalnatureofthecementsettingtime,strength,heatofhydration,etc.,sothecementfinenessdeterminedwhethertheregulatoryrequirements,importantforengineering.Thinthickslurrygreatimpacto
7、nthetechnicalnatureoftheexperimentalcementsettingtime,soundness,etc..Settingtimeofcementhaveinitialandfinalsetofpoints.Settingtimeofcementdeemedunqualifiedwaste.Soundnessofcementreferstotheprocessofsettingandhardeningofcementinthevolumechangeofuniformit
8、y.IfthecementcontainsmoreCaO,MgO,SO3,canchangethevolumeofuneven.四、实验内容及步骤:Experimentalcontentandsteps:1、水泥细度实验①筛析实验前,将负压筛放在筛座上,盖上筛盖,接通电源,检查控制系统,调节负压至4000~6000Pa范围内。②取出试样25g,置于洁净的负压筛中,盖上筛盖,放在筛座上,开动筛析仪连续筛析2min,筛析过程中如有试样附着在筛盖上,可轻轻敲剂