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1、EffectofSupplementaryCuringafterSteamcuringonPerfmanceofConcreteLIXiao1NIUWanyang1LIANGLei11.SchoolofMaterialsScienceEngineeringShenyangJianzhuUniversityShenyang100071ChinaAbstractWhenthelowstrengthgradeofsteamcuringconc

2、reteisproducedthetemperaturewhichtheconcreteleavessteamcuringkilnisabout20℃commonly.Thetemperaturedifferenceistoolargebetweentheenvironmentaltemperaturethetemperaturewhichtheconcreteleavessteamcuringkilnwhenthedailyavera

3、getemperaturesto10℃.Becausethesteamcuringconcreteiscooledrapidlyalagreofcrackwillbeproducedinconcretetheinternalstructureofconcretewillbedamagednmally.Thentheperfmanceofconcretewillbeinfluencedbadly.Indertoimprovethenega

4、tiveeffectonconcretebysteamcuringthedifferentsupplementarycuringisusedaftersteamcuring.TheC30concreteismadeinthisresearch.Thedailyaveragetemperatureis5℃~10℃theminimumtemperatureis6℃duringthetest.Aftertheconcreteisfmediti

5、splacedin20℃environmentf2hfirst.Thentheconcreteisheatedto55℃in2hmaintainedf8hinthesteamcuringkiln.Intheendtheconcreteiscooledto20℃in3h.Aftersteamcuringthestardcuringcoveringbywetfabricfilmoutsideareusedseparatelyfconcret

6、e.Thesupplementarycuringtimeis1d2d3d4d.Thentheconcreteisplacedinnaturalenvironmentto28d.Themicrostructureofhydrationproductsareobservedbyelectronmicroscope.Thedensityofconcreteisanalysedbytheresultofthe28dsaturatedwaterc

7、ontentsofteningfact28drapidcarbonationdepth.Themechanicalpropertiesofconcreteareresearchedbytheresultofthe28dstrength.Whentheconcreteadoptsstardcuringcoveringbyfilmaftersteamcuringthesaturatedwatercontent28drapidcarbonat

8、iondepthoftheconcretewillreducebutthesofteningfact28dstrengthoftheconcretewillincreasewiththetime.Theperfmanceofconcretewhichadoptscoveringbywetfabricaftersteamcuringiswsethanthatadoptingstardcuring.Atthesametimethesatur

9、atedwatercontentsofteningfactofconcretechangelittle.Coveringbywetfabriciswsethannocoveringsimilar.Inthetestenvironmenttheperfmanceofthesteamcuringconcretewitheachsupplementarycuringiswsethanthatoftheconcretewithstardcuri

10、ng.Thestardcuringisthebestsupplementarycuringinthistest.Butcoveringbyfilmisawthysupplementarycuringfromeconomypracticability.Coveringbyfilmf4dthe28dstrengthofsteamcuringconcreteis87percentofthatoftheconcretewithstardcuri

11、ngexceedsDesigngrade.Itssaturatedwatercontentis1.50%softeningfactis0.932.Itsrapidcarbonationdepthisclosetothatoftheconcretewithstardcuringitsmicrostructureofhydrationproductsispreferable.iginalityInnthchinatheprefabricat

12、edconstructionisperfectfconstructioninwinter.Thelowstrengthgradesteamcuringconcreteisusedintheprefabricatedconstructioncommonly.Thesteamcuringconcreteisplacedinoutdoyardfnaturalcuringafterleftthekiln.Itcracksitsperfmance

13、reducesfrequentlyafterproducinginwinter.Tosolvethisproblemthesupplementarycuringisusedaftersteamcuringinthisstudy.Thestardcuringcoveringbywetfabricfilmoutsideareusedseparatelyfconcrete.Thesaturatedwatercontentsofteningfa

14、ctstrength28drapidcarbonationdepthof28dconcretearetestedtoanalysetheeffectofeachsupplementarycuring.Themicrostructureofhydrationproductsareobservedbyelectronmicroscope.Thebestsupplementarycuringischosenfcushionofsteamcur

15、ing.Akindofeconomiceffectivemanufacturingtechnologyisstudiedfthelowstrengthgradesteamcuringconcreteinlowtemperatureenvironment.Itwillbewthyftheprefabricatedconstructionincoldregions.Keywds:steamcuringconcretecuringdensit

16、ystrength1Crespondingauth:lixiao7903@Tel8624246903015Fax862424690300curingageis26d.Thentheirsurfacesaresealedbyparaffinexceptapairofsideinfming.Undertheconstantcarbonationconditionthecarbondioxideismaintainedat（203）%theh

17、uityinthecarbonationboxis(705)%thetemperatureischosentobe(205)℃.Theconcretesamplesarecutsprayedbyphenolphthaleinsolution1%inethanolindicatafterstayingincarbonationboxf28d.Thenthecarbonationdepthofeverysurveypointinconcre

18、tesampleismeasuredbyverniercalipersafter30s.3.ResultsDiscussionAccdingtotable2theperfmanceofconcreteistestedwhichisadoptedstardcuringf28d.Itssaturatedwatercontentis1.08%softeningfactis0.95328drapidcarbonationdepthis3.6mm

19、strengthis42.9MPa.Thelargesofteningfactlittlesaturatedwatercontent28drapidcarbonationdepthshowthatthestardcuringconcreteisverydenseat28d.Withsamemixproptionsagetheperfmanceofsteamcuringconcreteiswsethanthatofstardcuringc

20、oncrete.Itssaturatedwatercontentis3.12%softeningfactis0.84728drapidcarbonationdepthis7.9mmstrengthis33.8MPa.Comparingwithstardcuringconcretethedensity28dstrengthofsteamcuringconcretereducesobviously.Thenthesteamcuringcon

21、cretewithdifferentsupplementarycuringispreparedtested.Thestardcuringcoveringbywetfabricfilmoutsideareusedseparatelyfconcreteassupplementarycuring.Theresultsoftestsareshowninfigure1.Atthesameagetheperfmanceofthesteamcurin

22、gconcretewithdifferentsupplementarycuringstillcannotbegoodasthestardcuringconcrete.Butstardcuringcoveringbyfilmaftersteamcuringcanhelptoimprovetheperfmanceofthesteamcuringconcrete.（a）saturatedwatercontent（b）Softeningfact

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