1.Concepts of civil engineering materials

《1.Concepts of civil engineering materials》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。

1、1.ConceptsofCEMCivilEngineeringMaterialsbyZecYuOverview•1)Physicalproperties•2)Mechanicalproperties•3)Interplaywithambientenvironment(water,air,heat,chill,chemicals,etc.)2/271.Physicalproperties1.1.Density1.2.Bulkdensity1.3.Apparentdensity1.4.Porosity1.5.Loose

2、density1.6.Voidratio1.7.Solidity,orratioofsolid3/27Density•DescriptionInanideallydensestate,massperunitvolumeisaninterestingparameter.•Formula??=?massdensity=volumeRockorsteelNopores4/27Bulkdensity•DescriptionWhenmaterialisporous,onewaytoroughlymeasureitsvolum

3、eistoignorethepores.•FormulaConcrete??=?allManyporesVall=Vsolid+Vsurfacepore+Vinternalpore5/27Apparentdensity•DescriptionWhenmaterialisporous,anotherwaytomeasureitsvolumeistosubtractthesurfacepores.•FormulaConcrete??=?solid+?internalporesManypores6/27Porosity•

4、DescriptionWhenmaterialsisporous.Understandingofthevolumeofporesiscritical.•FormulaConcrete?poresyoucancountporosity=?Manyporesall7/27Howdoporesaffectmaterials?•ConsideramaterialwithporesCompressiveBulkdensityStrengthPorosityStrengthWaterabsorptionPorosity8/27

5、Loosedensity•DescriptionSometimesthematerialismadeofdispersedparticles.ForsimplificationwedonotconsideranysubtractionofvolumeManypores•Formula??=?ManyvoidsallSandmassLoosedensity=?solid+?pore+?void9/27Voidratio•DescriptionSometimesthematerialismadeofdispersedp

6、articles.Toevaluatehowtheparticlesarestacked,wehavetoknowvolumeofvoid.Manypores•Formula?void1−?=Manyvoids?allSandVall=Vsolid+Vpores+Vvoid10/27Solidity•DescriptionSometimesthematerialismadeofdispersedparticles.Itisalsoimportanttofindouthowmuchsolidiscontained.M

7、anypores•Formula?solid+?pores?=Manyvoids?allSandVall=Vsolid+Vpores+Vvoid11/27Howtomakeastackdense?•Simplycompressthestackwillmakeitdenser.•Addwatertoincreasetheadhesionbetweenparticles.12/272.Mechanicalproperties2.1.Strength2.2.Elasticityandplasticity2.3.Fract

8、ure2.4.Brittleness2.5.Toughness13/27Strength•DescriptionConsideracubebeingcompressed,howmuchloadthecubecancarrydeterminesthecompressivestrength.Similarly,therearetensileandshearstr