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Self-Consolidating Concrete for Precast, Prestressed Concrete Bridge Elements (2009) / Chapter Skim
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Pages 23-28

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From page 23...
... . • SCC made with Type III cement and 20% Class F fly ash can exhibit better slump flow retention, higher passing ability, and higher filling capacity than SCC made with Type I/II cement.
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From page 24...
... Caisson filling capacity Maximum surface settlement Column segregation index Plastic viscosity Thixotropy (Ab) Form pressure 18-hour ' cf 56-day ' cf 18-hour MOE 56-day MOE 7-day flexural strength 56-day flexural strength Autogenous shrinkage at 7 days Autogenous shrinkage at 56 days Drying shrinkage after 28 days of exposure Drying shrinkage after 112 days of exposure Creep after 28 days of loading Creep after 112 days of loading Darkened areas indicate high degree of influence for the modeled mixture parameter.
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From page 25...
... • Although for a given binder content drying shrinkage is expected to increase with increased w/cm, for the derived statistical models an opposite trend appears because the drying shrinkage also includes autogenous shrinkage that decreases with the increase in w/cm. • SCC mixtures made with Type I/II cement develop less creep and shrinkage than those prepared with Type III cement and 20% Class F fly ash.
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From page 26...
... models. Coefficients of the following models were modified to provide better prediction of visco-elastic properties for SCC: • AASHTO 2004 model for estimating drying shrinkage • AASHTO 2007 model for estimating creep 4.4 Homogeneity of In-Situ Strength and Bond to Reinforcement • Highly flowable SCC should have adequate static stability with maximum surface settlement, column segregation index, and percent static segregation of 0.5%, 5%, and 15%, respectively, particularity for deep elements.
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From page 27...
... = 25.4 mm Shaded zones indicate suggested workability characteristics. All SCC mixtures must meet requirements for static stability.
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From page 28...
... Material Selection and Mix Design • Short term – Evaluation of the effect of shrinkage-reducing admixtures on shrinkage and creep of SCC used in precast, prestressed applications (relevant because of the higher drying shrinkage and creep of SCC)
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Key Terms

  • mix design
  • slump flow
  • percent static
  • coarse aggregate
  • filling capacity

  • compressive strength
  • fly ash
  • air bubbles
  • stressed concrete
  • filling ability

  • drying shrinkage
  • type iii
  • static stability
  • scc mixtures
  • column segregation

  • passing ability
  • surface settlement
  • scc mixture
  • static segregation
  • aggregate content

  • plastic viscosity
  • flexural strength
  • placement techniques
  • prestressed applications
  • hardened concrete

  • concrete properties
  • chemical admixtures
  • scc mix
  • aashto lrfd
  • mixture proportioning


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