资源描述：
《土木工程英语教案》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。
1、福建交通职业技术学院教案纸第页课程：学年第_1学期第周月日教学内容备注UnitOneCementIntroductionCement,anymaterialthathardensandbecomesstronglyadhesiveafterapplicationinplasticform.Thetermcementisoftenusedinterchangeablywithglueandadhesive;inengineeringandbuildingconstructionthetermusuallyreferstoafinelypowdered,manufacturedsubs
2、tanceconsistingofgypsumplasterorportlandcementthathardensandadheresafterbeingmixedwithwater.Cementsareusedforvariouspurposes,suchasbindingsandandgraveltogetherwithPortlandcementtoformconcrete,forunitingthesurfacesofvariousmaterials,orforcoatingsurfacestoprotectthemfromchemicalattack.Cementsare
3、madeinawidevarietyofcompositionsforawidevarietyofuses.Theymaybenamedfortheprincipalconstituents,suchascalcareouscement,whichcontainssilica,andepoxycement,whichcontainsepoxyresins;forthematerialstheyjoin,suchasglassorvinylcement;fortheobjecttowhichtheyareapplied,suchasboilercement,orfortheircha
4、racteristicproperty,suchashydrauliccement,whichhardensunderwater,oracid-resistingcement,orquick-settingcement.Cementsusedinconstructionaresometimesnamedfortheircommonlyreportedplaceoforigin,likeRomancement,orfortheirresemblancetoothermaterials,suchasPortlandcement,whichproducesaconcreteresembl
5、ingthePortlandstoneusedforbuildinginEngland.Cementsthatresisthightemperaturesarecalledrefractorycements.Cementsset,orharden,bytheevaporationoftheplasticizingliquidsuchaswater,alcohol,oroil,byinternalchemicalchange,byhydration,orbythegrowthofinterlacingsetsofcrystals.Othercementshardenastheyrea
6、ctwiththeoxygenorcarbondioxideintheatmosphere.PortlandCementTypicalPortlandcementsaremixturesoftricalciumsilicate,tricalciumaluminate,anddicalciumsilicate,invaryingproportions,togetherwithsmallamountsofmagnesiumandironcompounds.Gypsumisoftenaddedtoslowthehardeningprocess.Portlandcementismanufa
7、cturedfromlime-bearing'materials,usuallylimestone,togetherwithclays,shales,orblast-furnaceslagcontainingaluminaandsilica,intheapproximateproportionsof60percentlime,19percentsilica,and8percentalumina,5percentiron,5percentmagnesia,and3per
