Page 158 - 《水资源与水工程学报》2022年第5期
P. 158
! 33 " ! 5 # & ' ( ) & * + , - Vol.33No.5
2022 $ 10 % JournalofWaterResources&WaterEngineering Oct.,2022
DOI:10.11705/j.issn.1672-643X.2022.05.19
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HIJKL:TV41 MNOPQ:A MRSL:1672643X(2022)05015406
Effectofflyashdosageonmicrostructureofcarbonizedcementpaste
BAIJiajia,LINNan,WANGJianmin,LIUJunzhe
(SchoolofCivilandEnvironmentalEngineering,NingboUniversity,Ningbo315211,China)
Abstract:Inordertoexploretheinfluenceofflyashcontentonthecarbonationresistanceofcement
paste,themercuryintrusionmethod,evaporativewatercontentmethodandXRDdiffractionpatternwere
usedtostudytheinfluenceofflyashcontentontheinternalmicrostructureofcementpasteundercar
bonation.Theresultsshowthattheincorporationofflyashpromotesthecarbonationofthecementpaste
specimens ,andthecarbonationdepthofthespecimensisthelargestwhenthedosageofflyashis30%.
Withtheincreaseoftheflyashdosage ,thetotalporosityofthecementpasteincreases,thetotalporosity
aftercarbonationdecreases ,theproportionofsmallporesincreases,theporestructureofthecement
pasteisimproved ,thecalciumalumaftercarbonationdisappears,andcalciumcarbonateisgenerated.
Thecarbonationisconducivetothehealingofcracksinthecementpastespecimens,andtheaverage
crackwidthwith30% flyashdosageisreducedby72% comparedwiththatbeforethemaintenanceof
flyash.
Keywords:cementpaste;carbonation;flyashdosage;microstructure;crackwidth
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