建筑专业英语-08 Building Materials

Unit8

BuildingMaterials建筑材料DialoguePassageAExercisesObjectives单击进入单击进入单击进入单击进入TeachingStepsObjectives3.Introducesomereadingskills1.Tellushowtopourconcreteandhowtocureit.2.Talkaboutvarioustypesofcement.主菜单DIALOGUE

A:Concreteisabuildingmaterialofmoderntimes.Whendiditappear?

B:Iamafraidyoumadethesamemistakeasmanypeopledo.Asamatteroffact,itshistorybeganwiththeRomans,whousedittobuildtheir

aqueductsandamphitheatres.ColosseuninRomePantheoninRome主菜单A:AsfarasIknow,concreteisamixtureofwater,gravelandsandwithPortlandcement.Astheworkmenareconcerned,addingplentyofwatermakesplacementoftheconcreteeasier.B:Youmustrememberthatthegreatertheproportionofwaterinwater-cementratiois,theweakerthefinalconcretewillbe.Whenanexcessiveamountofwaterhasbeenused,therewillbeanexcessivenumberofvoids,whichmaycausetheconcretetoleakbadly.DIALOGUE水灰比A:Oh,Isee.HowCanitbecured?B:Thetimeduringwhichconcretehydratesandincreasesinstrengthisitscuringperiod.Throughoutthecuringperiod,therefore,alltheexposedsurfacesoftheconcretemustbekeptmoist.Onlyinthiswaywilltheconcretebecomeincreasinglystronger,denserandmoreimpervioustowater.DIALOGUE养护期A:Howlongisthecuringperiod?B:Theconcretemustbekeptcontinuallymoistfor14daysandlongerifatallpossible.water

gravel

sand混凝土的组成thecompositionofconcretecement混凝土的养护

concretecuringThesurfaceiscoveredtokeepitmoist.DIALOGUE1.material:withwhichsomethingismade2.cement:greypower(madebyburninglimeandclay)which,afterbeingwetted,becomeshardandisusedforbuildingWordsandPhrases3.aqueduct:astructureofcarryingwater,usuallybuiltlikeabridgeacrossavalleyorlowground4.amphitheatre:acircularbuildingwithoutaroofandwithrowsofseatsthatriseinstepsaroundanopenspace,oftenusedinancientGreeceandRomeforpublicentertainment5.Portlandcement:anameofplaceinAmericawhereitisfamousforitscement返回返回返回返回返回8.hydrate:chemicalcompoundofwaterwithothersubstances9.curingperiod:thetimeduringwhichconcretehydratesandincreases10.moist:wet11.impervious:portion&ratio:

relationbetweentwoamountsdeterminedbythenumberoftimesonecontainstheothervoid:empty,vacantWordsandPhrases

返回返回返回返回返回返回BuildingMaterialsThematerialsarethebasicelementsofanybuilding.Buildingmaterialsmaybeclassifiedintothreegroups,accordingtothepurposestheyareusedfor.

Structuralmaterialsarethosethatholdthebuildingup,keepitrigid,formitsoutercoveringofwallsandroof,anddivideitsinteriorintorooms.Inthesecondgrouparematerialsfortheequipmentsinsidethebuilding,suchastheplumbing,heatingandlightingsystems.Finally,therearematerialsthatareusedtoprotectordecorateothermaterials.主菜单structuralmaterialsequipmentsmaterialsTheClassificationofConstructionMaterialsotherdecoratingmaterialsTheclassificationofconstructionmaterialsSteelandconcretearethemostwidelyusedstructuralmaterialstoday.Steelistrulyanall-aroundmaterial.Itisnearlyasdurableasstone.Butitmustbepaintedtopreventitfromrusting.Inmodernconstructionsteelisusedforthesupportingframeworkoflargebuildings.steelBuildingMaterials

Cementisanimportantbuildingmaterial.OfthevariousPortlandcements,thefollowingvarietiesarenowgenerallyavailablefromthemarketsintheindustrializedcountries.OrdinaryPortlandcement,whichisthecheapest;(普通硅酸盐水泥，这是最便宜的)

(2)Rapid-hardeningcement,whichisslightlymoreexpensivethan(1);(快硬水泥，比普通硅酸盐水泥略贵)(3)Sulphate-resistingcement;(耐硫酸盐水泥)concreteLang-churchinFranceBuildingMaterials(4)Air-entrainingcementwhichgreatlyimprovesthefrostresistanceoftheconcrete.;(加气水泥，大大改善混凝土的抗冻性)(5)Low-heatcementformassiveconstructionsuchasdams;(低热水泥，用于大体积建筑，如大坝)(6)High-aluminacement,whichreachesaPortland28-daystrengthin24hourswithcorrespondinghighheat.Itscolorisnormallyblack.(高矾土水泥，通常为黑色，高矾土水泥经过24小时即可达到硅酸盐水泥28天内才能达到的强度，同时发出高热)

(7)Anotherhigh-aluminacement,whichisusedforfurnacelinings,iswhite.Itisseveraltimesmoreexpensivethantheblackvariety.(用作炉衬的高矾土水泥，呈白色，它比黑色高矾土水泥要昂贵几倍。)BuildingMaterialsTheabove-mentionedcementsarewidelyusedontheconstructionsite.Nowlet’stalkaboutpipes.Pitchfiberisaneasilyjoinedpipeanditisasstrongasstonewarepipes,butitisnotsoresistanttoallcorrosiveorhotliquids.Asbestoscementpipes,ontheotherhand,canbeusedforliquidswithalmostanypurpose.Themoreexpensivesheetisnailable,almostasstrongaswoodandfullyfireproof.Thecheapersheetiseasilybrokenbyshockorpressureorundertheeffectofaframe.Plasticshavebeenwidelyusedforavarietyofaccessoryrolesinbuildingsincludingpanels,drainpipesanddecorativeceilings.BuildingMaterialspitchfiberpipeasbestoscementsheetplasticssheetCompositematerialsaregainingimportanceinbuildinghomes.Amodernmaterialinhousebuildingisglass-reinforcedpolyesterresin.Panelsofthismaterialarecompositesthemselves.Materialsusedfordoorsandwindowframesaretimber,steelandaluminumalloys.woodenwindowswrappedwithaluminum铝包木窗plastic-steelwindows塑钢窗aluminum

windows铝合金窗BuildingMaterialsEXERCISES1.Theweatherforecastsaysthattherewillbeaheavy____heretomorrow.2.Thepeopleinthearea

floods.3.Thesehousescatchfireeasilyasthebuildingmaterialsaren’t

.4.Aseverybody