建筑專業(yè)英語(yǔ)-08 Building Materials

Unit8

BuildingMaterials建筑材料DialoguePassageAExercisesObjectives單擊進(jìn)入單擊進(jìn)入單擊進(jìn)入單擊進(jìn)入TeachingStepsObjectives3.Introducesomereadingskills1.Tellushowtopourconcreteandhowtocureit.2.Talkaboutvarioustypesofcement.主菜單DIALOGUE

A:Concreteisabuildingmaterialofmoderntimes.Whendiditappear?

B:Iamafraidyoumadethesamemistakeasmanypeopledo.Asamatteroffact,itshistorybeganwiththeRomans,whousedittobuildtheir

aqueductsandamphitheatres.ColosseuninRomePantheoninRome主菜單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養(yǎng)護(hù)期A:Howlongisthecuringperiod?B:Theconcretemustbekeptcontinuallymoistfor14daysandlongerifatallpossible.water

gravel

sand混凝土的組成thecompositionofconcretecement混凝土的養(yǎng)護(hù)

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.主菜單structuralmaterialsequipmentsmaterialsTheClassificationofConstructionMaterialsotherdecoratingmaterialsTheclassificationofconstructionmaterialsSteelandconcretearethemostwidelyusedstructuralmaterialstoday.Steelistrulyanall-aroundmaterial.Itisnearlyasdurableasstone.Butitmustbepaintedtopreventitfromrusting.Inmodernconstructionsteelisusedforthesupportingframeworkoflargebuildings.steelBuildingMaterials

Cementisanimportantbuildingmaterial.OfthevariousPortlandcements,thefollowingvarietiesarenowgenerallyavailablefromthemarketsintheindustrializedcountries.OrdinaryPortlandcement,whichisthecheapest;(普通硅酸鹽水泥，這是最便宜的)

(2)Rapid-hardeningcement,whichisslightlymoreexpensivethan(1);(快硬水泥，比普通硅酸鹽水泥略貴)(3)Sulphate-resistingcement;(耐硫酸鹽水泥)concreteLang-churchinFranceBuildingMaterials(4)Air-entrainingcementwhichgreatlyimprovesthefrostresistanceoftheconcrete.;(加氣水泥，大大改善混凝土的抗凍性)(5)Low-heatcementformassiveconstructionsuchasdams;(低熱水泥，用于大體積建筑，如大壩)(6)High-aluminacement,whichreachesaPortland28-daystrengthin24hourswithcorrespondinghighheat.Itscolorisnormallyblack.(高礬土水泥，通常為黑色，高礬土水泥經(jīng)過(guò)24小時(shí)即可達(dá)到硅酸鹽水泥28天內(nèi)才能達(dá)到的強(qiáng)度，同時(shí)發(fā)出高熱)

(7)Anotherhigh-aluminacement,whichisusedforfurnacelinings,iswhite.Itisseveraltimesmoreexpensivethantheblackvariety.(用作爐襯的高礬土水泥，呈白色，它比黑色高礬土水泥要昂貴幾倍。)BuildingMaterialsTheabove-mentionedcementsarewidelyusedontheconstructionsite.Nowlet’stalkaboutpipes.Pitchfiberisaneasilyjoinedpipeanditisasstrongasstonewarepipes,butitisnotsoresistanttoallcorrosiveorhotliquids.Asbestoscementpipes,ontheotherhand,canbeusedforliquidswithalmostanypurpose.Themoreexpensivesheetisnailable,almostasstrongaswoodandfullyfireproof.Thecheapersheetiseasilybrokenbyshockorpressureorundertheeffectofaframe.Plasticshavebeenwidelyusedforavarietyofaccessoryrolesinbuildingsincludingpanels,drainpipesanddecorativeceilings.BuildingMaterialspitchfiberpipeasbestoscementsheetplasticssheetCompositematerialsaregainingimportanceinbuildinghomes.Amodernmaterialinhousebuildingisglass-reinforcedpolyesterresin.Panelsofthismaterialarecompositesthemselves.Materialsusedfordoorsandwindowframesaretimber,steelandaluminumalloys.woodenwindowswrappedwithaluminum鋁包木窗plastic-steelwindows塑鋼窗aluminum

windows鋁合金窗BuildingMaterialsEXERCISES1.Theweatherforecastsaysthattherewillbeaheavy____heretomorrow.2.Thepeopleinthearea

floods.3.Thesehousescatchfireeasilyasthebuildingmaterialsaren’t

.4.Aseverybody