2023年全國(guó)碩士研究生考試考研英語一試題真題（含答案詳解+作文范文）_第1頁
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1、HardeningacceleratbasedonnewchemicalsefficientatlowtemperatureinblendedcementAlManasirN1JuvikD.A1RauseoR1NgS21.MapeiASVallsetvegen6Sagstua2120Nway2.SINTEFByggfskFskingsveien3bOslo0314NwayAbstractTheusageofblendedcementsa

2、lsodemsfhighproductivityinbuildingindustryevenduringwintertimeincreasetheneedfmeefficienthardeningaccelerat.Theindustryfacestheproblemoftraditionalacceleratsnotwkingatlowtemperaturesaproblematicreductionofslumpretentiond

3、uetoearlysettingofmatrix.Toaddressthischallengetheperfmanceofhardeningacceleratsaswellasincombinationwithasettingaccelerathavebeenhighlightedftheireffectivenessincementsblendedwithslagflyash(CEMII)here.Theacceleratsweres

4、howntowkextremelywellatbothlow5Croomtemperaturewherebycompressivestrengthsofconcretecastedduringearlyhydrationwerefoundtobeupto150%higherthanwithouttheuseofacceleratsatlowtemperature5C24h.Additionallythecompressivestreng

5、thsat28dayswerenotnegativelyaffectedbutincreased.Nodetrimentaleffectontheconcreteslumpflowwasfoundmakingthemidealfimprovingthehydrationofblendedcements.Extendeduseofblendedcementreducedheatingofthefreshconcretewillfroman

6、environmentallyperspectivereduceenergyconsumptioncarbonprintfromtheindustry.Fromaneconomicalperspectiveanewefficientwelldocumentedacceleratcanincreasetheproductivityonsiteinwintercostreductionbetterqualityincreasedsecuri

7、tyinbuildingprocess.iginalityNewdevelopedacceleratshowhugeincreaseinearlystrengthdevelopmentatlowtemperaturewillbeanimptantcontributiontothedevelopmentoffuturecastingtechniquesinareaswithlowtemperature.Keywds:Hardeningac

8、celeratcastinginlowtemperatureearlystrengthblendedcement.1Crespondingauth:Tel4797011747Fax4762972099OxideCEMIIAV42.5RCEMIIAV52.5NCEMIIBS52.5NSiO225.5523.524Al2O38.386.46.5Fe2O34.033.42.0CaO51.9956.357MgO2.512.65.3SO33.69

9、3.53.0K2O1.191.20.65Na2O0.570.30.3Na2Oekv.1.41.10.73C3A5.45.3Flyash2012.3Blainefineness(m2kg)450445470Density(kgm3)2990301430802.2AggregatesThenaturalaggregates08mm816mmusedweresuppliedbyNStoneAs(Nway).Thefineaggregateha

10、saspecificgravityof2.68kgdm3waterabsptionof0.3%whilethecoarseaggregatehasaspecificgravityof2.69kgdm3waterabsptionof0.4%.Themoisturecontentoftheaggregateswasmeasuredonthesamedayastheywereused.ThegradingcurvesareshowninFig

11、ure1.Figure1Gradingcurvesofmixturesoffinecoarseaggregatesreferenceacombinedcurvefa)C3037D16concreteb)C3545D16concrete.2.3AcceleratsCompressivestrengthaswellasotherstructuralpropertiesofconcretedependslargelyonthedegreeto

12、whichcementhydrates.ThemaintaskofthispaperistohighlighthardeningacceleratsfblendedcementswhichwasfmulatedbyusingchemicalsbasedontherequirementstateinEN9342.AccdingtostardEN9342ahardeningacceleratisdefinedas:“achemicaltha

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