废橡胶粉的改性及其水泥基复合材料

华中科技大学硕士学位论文废橡胶粉的改性及其水泥基复合材料姓名：冯雪申请学位级别：硕士专业：化学工艺指导教师：解孝林;周兴平20090528INaOHSiO2SiO21SiO22NaOH3NaOHSiO2SiO25%10%15%SiO2NaOH4SiO25SiO2Ca(OH)2C-S-HC-S-HIIAbstractUseofwasterubberpowderincementconcreteisavailabilitytorelievetheenvironmentalandsocialproblemcausedbythedeposalofworntires,andimprovetheductileofconcreteaswell.Thereforemanyresearchersobservedaseriousdecreaseinmechanicalpropertiesofcementitiouscompositeswithwastetirepowder,whichlimiteditsapplication.Howtoimprovetheperformanceisahotpot.Inthiswork,NaOHtreated,nano-SiO2modifiedandin-situSiO2modifiedrubberpowderwereprepared.Andtheeffectonthebasicpropertiesofrubberizedconcretewasinvestigated.Mainresultswereasbelow:1.Comparedwithuntreatedrubberpowder,themodifiedrubberpowdershowedbetterdispersityinwater.In-situSiO2modifiedrubberpowderwasagglomeratedto“blocks”afterdried,withwidesizedistribution.2.Theadditionofrubberpowderhasnegativeeffectontheflowabilityandstrengthofcementmortar,butimprovestheductile.NaOHtreatedrubberhasbetteradhesionwithcementmortarthantheuntreatedrubber.Theamountofrubberpowderissuggestednottoomuch.3.Fourdifferentkindsofrubberpowderwereusedinthecementconcrete:(1)untreated,(2)NaOHtreated,(3)nano-SiO2modified,and(4)in-situSiO2modified.Cementwassubstitutedonweightby5%,10%,15%respectively.Modificationsofrubberpowdercouldimprovethestrengthandabrasionresistanceofrubberizedconcrete.SiO2modificationwasmoreeffectivethanNaOHtreated.4.Moldingmethodhassignificanceeffectontheperformanceofconcrete.Theconcretewithin-situSiO2modifiedrubberpowderdisplayedbettermechanicalpropertieswhenmoldedwithtwo-step.5.Nano-SiO2onthesurfaceofrubberwasreactivetotheCa(OH)2crystal,whichwasstructuralharmfulinconcrete,andthencalciumsilicatehydrate(C-S-H)gelwasformed.Thustherubberandmatrixhadabetterinterface,andthestrengthofconcretewasimproved.Keywords:wasterubberpowder;modification;cementconcrete;performance;mechanism._____1120085.46146.7%[1]20000.3220071.51.2310[2]“”1.1[3]1.1.115-30%[4]80007%[5]4.5%10%20%15021.1.271-11-1Fig1-1Recyclingofwastetire1[5]23.3×104kJ/kg[6]3[7]4340%1-1[8]51-1Tab1-1ComparisonoftheenergyofrubberandrelatedrawmaterialproductionprocessTOEt(kgm3)TOE(m3)3.19402.90.49200.350.512000.60.3512000.40.312000.352.418004.3TOE1.21.4mm1.2.11[9]-704[8]2[10]3[11]1.2.220%30%NRBRSBR50%[12]1-21-341-41400µm1-2[13]Tab1-2PhysicalcompositionsofRPs[13]wt%2040wt%8045wt%1551-3[8]Tab1-3ChemicalcompositionsofRPs[8]PCPC+LTTBwt%47.644.654.1(60)wt%19.416.912.5(15.5)wt%3.14.23.8(7.5)wt%25.230.726.3(44)wt%6.547.226.13PCLTTB1-4[7]Tab1-4Classificationofrubberpowderbydiameter[7]12~3030~4747~200200µm1400~500500~300300~7575[14][15]Wijs100g0.153mol1.2.31688010%3%[8]22080[16][17]PVCPVC3RMA[18]1300[19][20]1.31.3.120~80715%RubberReclaimingCompany2040RamflexTMCharlesMcDdonald2060OverflexTM1.1[21][22]80120022007100[23]1.3.23081Raghavan[24]10%20%Toutanji[25]EldinSenouci[26]85%50%BielLee[27]Topcu[28]290KhatibBayomy[29]60%920%TopcuSaridemir[30]10%[31]Na2SO4/NaCl55--[32]NaClNaClHernandez-Olivare[33]Benazzouk[34]Benazzouk[35]TPS101.41.4.1SiO2SiO2SiO21.4.2SiO21SiO2SiO2NaOH2/34SEMSiO2111.4.3SiO2SiO2——1222.12.1.1[36]“-”[37,38][39-42][17,43-45]2.1.2Eldin[[26]Rostami[46]CCl416%CCl457%Segre[47]NaOH[48][49]——NaOHNaOHNaOH[50]Li[51]NaOHMarques[52]NaOH13[53]SRPSRP/SRP[54]28d5%-[55]2.1.3SiO2SiO2[57-59][45,59]SiO2[61-64]Ca(OH)2SiO2Ca(OH)2C-S-HCa(OH)2SiO2--SiO2SiO2SiO2/SiO2/-SiO2SiO2SiO214[64]-SiO2[65,66]SiO2SiO2/SiO2SiO2-SiO2SiO2SiO2NaOH2.22.2.1602-1a-RP2-160Fig2-1Photographofthe60meshrubberpowder1cm152-1Tab2-1ReagentsARARARARARARAR2-2Tab2-2ApparatusS21-2SHB-FA2004NDZF-1BCS1012.2.2NaOHNaOHb-RP110%NaOH2330min431652.2.3SiO2SiO28-10h5%SiO2c-RPSiO21/92.2.4SiO2[67]SiO2Na2SiO39H2O+HClSiO2+NaCl+H2O(2-1)1SiO230SiO22SiO218-10h5%SiO2d-RP1mol1molSiO2SiO2/RP=1/92.32.3.1TEMSiO2SiO2SiO2FEITecnaiG220SiO280kv172.3.2TGPETGA-710/min2.3.3SiO22-210.0mm5.00mm2.50mm1.25mm0.630mm0.315mm0.160mm2-2Fig2-2Photographofasetofsievesforfineaggregateofconcrete3min2-1%100×=mRAs2-2A——%RS——gm——g0.1%182.3.45g100ml20min30s200s2.42.4.1TEMSiO2TEM2-4ASiO2B-SiO22-3SiO2ASiO2BTEMFig2-3TEMimagesofnano-SiO2powder(A)andin-situSiO2(B)inalcoholSiO2SiO250-100nmBSiO2SiO22.4.2TG2-400..11µµmm00..22µµmmBA00..22mm190200400600800020406080100d-RPc-RPb-RPWeight(%)Temperature(oC)a-RP2-4Fig2-4TGcurvesofRPsSiO2cdab800NaOHcdSiO2800SiO2SiO2SiO2SiO2SiO22.4.3SiO2SiO22-52-6SiO22-5a-RP1.25mm1.25-0.63mmc-RPa-RP2.5mm“”20%d-RP2.5mm“”5mm40%SiO2SiO220100806040200d-RPc-RPa-RP0.160.3150.631.252.55Accumulativeresidueonsieve(%)Diameter(mm)102-5Fig2-5DiameterdistributionofRPs2-6ASiO2BSiO2Fig2-6Photographof(A)nano-SiO2modifiedand(B)in-situSiO2modifiedRP2-6SiO2SiO2SiO2SiO22-1SiO2SiO2SiO2SiO2SiO2SiO2BA1cm21SiO2SiO2/SiO2SiO2SiO22.4.42-72-7ABC30sD200sFig2-7RPs(A)withoutultrasonic,(B)underultrasonic,andthen(C)storingfor30s,(D)storingfor200sAabcdSiO2B20mina-RPC30sbdc/SiO2D200scSiO2bdSiO2NaOHABCD22SiO2SiO2SiO2SiO2SiO22.51SiO2-SiO2SiO22SiO2SiO2SiO2233/3.1/3.23.2.13-13-1/Fig3-1ExperimentprogramofRP/cementmortar243.2.232.51.45kg/m32.50kg/m33-2NaOHa-RPb-RP21008060402000.160.3150.631.252.55Accumulativer