水泥基复合材料多尺度模拟ppt课件.ppt

《水泥基复合材料多尺度模拟ppt课件.ppt》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。

1、3Micro-porestructureformationandmoisturetransportLuoMian2011.9.30Contents4Contents4Contents43.1Basicmodelingofmicro-porestructuredevelopmentGoal:predictthemicro-porestructurewithtimeOutlineoftheporestructuredevelopmentcomputationinterlayerGelporeCapill

2、aryporeMicro-porestructuresInterlayerporosityGelporositydistributionThetotalgelporosityCapillaryporositydistributionThetotalcapillaryporosityThetotalporositydistributionTheauthorssubdividetheoverallcementitiousmicro-porestructuresintothreebasiccomponent

3、s：R-Rdistributionfunction：Weneedtoknowthe5parametersMacroscopicvolumetricbalanceofhydrationproducts3.3Extendedmodelingoftemperature-dependentmoisturetransportequilibriumThepurposeofthispartistoquantifythetemperaturesensitivityofthestateandtransportofmoi

4、stureinnano-metertomicro-metertoscalepores,bothexperimentallyandtheoretically,andtoenhanceasystemforinternalmoistureinmotionthelawofmassconservationgoverningthebalanceinasystemthepotentialtermformoistureinaporousmaterialθwisthemassofmoistureinaunitvolum

5、eofconcreteJismoisturefluxQisthesinktermcorrespondingtowaterconsumptionduetohydration(a)densityofwater(b)surfacetension(c)viscosityofwaterEquilibriumbetweenliquidandvaporphaseofwaterunderarbitrarytemperatures（273

6、conductivitywithrespecttotheporepresuregradientDtismoistureconductivitywithrespecttothetemperaturegradientMoistureforbothevaporandliquidwaterΩDisthecollisionintegeralattemperatureT1orT2(1)(2)CalculationofthedegreeofsaturationinaporoussystemMulti-scalemo

7、delingofmoistureexistingincapillary,gelandinterlayerpores.thetotaldegreeofsaturationStotaliscalculatedasfollowφcpisthecapillaryporosityφglisthegelporosityφlristheinterlayerporosityScpisthedegreeofsaturationofcapillaryporesSglisthedegreeofsaturationofgel

8、poresSlristhethedegreeofsaturationofinterlayerporesComputedmoistureisothermMoisturelossbehaviorsat20°Cand60°CThesersultsidicatethatthemostimportantissueforfutureconsiderationisanoppropriateexpressionofmoistureequilibriumbasedonam