版權說明:本文檔由用戶提供并上傳,收益歸屬內容提供方,若內容存在侵權,請進行舉報或認領
文檔簡介
1、EarlyagehydrationbehaviofcementpastesfromshrinkageelectricalresistivityresponsesWenchongSHILianzhenXIAO1DiZOUSchoolofMaterialsScienceEngineeringWuhanInstituteofTechnologyWuhan430073ChinaAbstractThepasteswithwatercementra
2、tiosof0.30.350.40.45werepreparedfmeasuringthechemicalshrinkage(CS)theautogenousshrinkage(AS)theelectricalresistivity(ERρ)duringhydrationperiodof168hrs(10080mins).TheCSvalueincreaseswiththeincreaseofwchowevertheASvaluethe
3、ERvaluedecreaseswiththeincreaseofwc.wchasagreaterinfluenceontheASresultsofcementpastesin1dthecementpastewithahigherwcshowsaexpansiontrendinearlyperiod.Thedifferentialcurveoftheresistivitycanrevealcementhydrationprocessme
4、intuitively.TheASCSvs.timeshowsalineartrendbytwodersofmagnitude.AnexponentialrelationshipbetweentheelectricalresistivitytheautogenousshrinkagefromeachpastegivesacluetoobtaintheASdevelopmenttendencyofapasteaccdingtoitsele
5、ctricalresistivity.iginalityTheassociatedhydrationphysicalparameterssuchasthechemicalshrinkagetheautogenousshrinkagetheelectricalresistivityweremeasuredthecrelationswerequantitativelyestablishedanalyzed.Keywds:Cementpast
6、echemicalshrinkageautogenousshrinkageelectricalresistivity1.IntroductionWhencementhydratesfwhichtheabsolutevolumeofhydrationproductsislessthanthesumofabsolutevolumeofreactantsthevolumeshrinksduringhydrationnamelychemical
7、shrinkage.Itrepresentsthechangeofabsolutevolumeofacementpaste.Befesettingthepastecannotfmasufficientstrengthtoresistshrinkagethevolumechangeofthepasteisthentheoutwardmanifestationofchemicalshrinkage.Afterhardeningthepast
8、efmaskeletonstructure(SuA.2008)volumecontractioncausedbychemicalshrinkagepartlyreflectedinthefmationofthepesinsidethepaste.Meanwhilewaterconsumptioncausedbyhydrationleadstoalowerrelativehuityaheavierselfdesiccation(PLura
9、.etal.2001)withincreasedcapillarypressureautogenousshrinkagehappens.Autogenousshrinkageisanexterivolumedefmationofconcreteundertheenclosedconditionhomothermalnoexternalfce(JensenOM.etal.2001).Watercementratioofcementpast
10、eisthedecisivefactinwhethertheincidenceofautogenousshrinkage.Thestudieshaveshownthat0.42isthecriticalwatercementratiofcompletehydrationofthecementitmeansASoccursonlywhenwcislowerthan0.42(T.CPowers.etal.1948)affectedbythe
11、typeofcementthecriticalwatercementratiousuallybetween0.360.48(BertilP.etal.2002).Fthecementbasedmaterialscementhydrationleadstowaterconsumptiontheelectricalresistivitychangeswiththedecreaseofliquidphaseincreaseofsolidpha
12、sethus1Crespondingauth:lz.xiao@Tel18995549041Figure.1settingtimesofdifferentwatercementratiosamples3.2ChemicalshrinkageThechemicalshrinkageresultsduring7dwereshowninFigure.2.ItcanbeseenthattheCScurveofeachpastedevelopswi
13、thtimeatafasterratein1d(1440min)thenbecomesslowerwithhydrationtimeafterwards.1dageisthedemarcationpointofshrinkagegrowthtrend.TheCSvaluesincreasewithwctheCScurvesgapamongthewcratiosbecomewiderwithhydrationtime.Figure.2th
14、echemicalshrinkagecurvesofcementpastesChemicalshrinkageiscausedbyhydrationreaction.Therefethevaluesofchemicalshrinkagereflectthehydrationreactionratequantitatively.Hydrationreactioniscontrolledbycrystalnucleationcrystalg
15、rowthinearlyagethehydraterateisfast.Withhydrationtimethehydrationproductwrapscementparticlesthushinderinghydrationprocesshydrationreactionisconvertedtobecontrolledbyphaseboundaryreactionhydraterategetsslower(YanP.etal.20
16、06).From2dto7dthechemicalshrinkageincreaseslinearlyitdemonstratesthatchemicalshrinkageisproptionaltothetimefenoughwaterisavailablenoothershrinkageoccurs.Fahigherwcmewaterissuppliedaroundthecementparticlesthehydrationreac
溫馨提示
- 1. 本站所有資源如無特殊說明,都需要本地電腦安裝OFFICE2007和PDF閱讀器。圖紙軟件為CAD,CAXA,PROE,UG,SolidWorks等.壓縮文件請下載最新的WinRAR軟件解壓。
- 2. 本站的文檔不包含任何第三方提供的附件圖紙等,如果需要附件,請聯(lián)系上傳者。文件的所有權益歸上傳用戶所有。
- 3. 本站RAR壓縮包中若帶圖紙,網(wǎng)頁內容里面會有圖紙預覽,若沒有圖紙預覽就沒有圖紙。
- 4. 未經(jīng)權益所有人同意不得將文件中的內容挪作商業(yè)或盈利用途。
- 5. 眾賞文庫僅提供信息存儲空間,僅對用戶上傳內容的表現(xiàn)方式做保護處理,對用戶上傳分享的文檔內容本身不做任何修改或編輯,并不能對任何下載內容負責。
- 6. 下載文件中如有侵權或不適當內容,請與我們聯(lián)系,我們立即糾正。
- 7. 本站不保證下載資源的準確性、安全性和完整性, 同時也不承擔用戶因使用這些下載資源對自己和他人造成任何形式的傷害或損失。
最新文檔
- fsn_ 1204-luis baquerizo-2. hydration of portland cement-fp
- fsn_ 1086-lina zhang-2.hydration of portland cement-fp
- fsn_ 837-oscar mendoza-2.hydration of portland cement-fp
- fsn_ 1127-wolfgang kunther -2. hydration of portland cement - fp
- fsn_ 900-hydration of pc-fp
- fsn_ 1056 - mileva radonjic - 2. hydration of pc - fp
- fsn_ 1465-hong-hydration of pc-fp
- fsn_ 850-lixiao niuwanyang lianglei-2. hydration of pc_fp
- fsn_ 1299-kong xiangming-2. hydration of pc-fp
- impacts of calcium sulfate on the hydration of calcium aluminate cement - portland cement blends
- fsn_ 930 - nicoleau luc - 2. hydration of pc - full paper
- fsn_ 1546-andre nonat-2. hydration of pc-full paper
- thermodynamics of portland cement clinkering
- fsn_ 857-veryazov an-2.hydratio
- calorimetry of portland cement with silica fume and gypsum additions
- experimental investigation of hydration of ternary blended cement paste
- the hydration of blended cement at low w_b ratio
- Calorimetry of portland cement with silica fume and gypsum additions.pdf
- Calorimetry of portland cement with silica fume and gypsum additions.pdf
- hydration and microstructure development in accelerated cement pastes produced by spraying for th
評論
0/150
提交評論