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Concrete Superplasticizers

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Concrete Superplasticizers By Felipe Perez What is a superplasticizer Developed in the 1960 s First used in Japan and Germany Introduced in the U.S. in the 1970 s ... – PowerPoint PPT presentation

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Title: Concrete Superplasticizers


1
Concrete Superplasticizers
  • By
  • Felipe Perez

2
What is a superplasticizer
  • Developed in the 1960s
  • First used in Japan and Germany
  • Introduced in the U.S. in the 1970s
  • Neutralizes the surface charges
  • Causes dispersion
  • Releases water in cement particles
  • Reduces viscosity
  • Linear polymers containing sulfonic acid groups
  • Sulfonated melamine-formaldehyde condensates
  • Sulfonated nephthalene-formaldehyde condensates
  • Modified lignosulfonates
  • Polycarboxylate derivatives

3
Main Purpose
  • Produce flowing concrete (7-9 slump increase)
  • Easy placement (picture concrete will fill all
    gaps between rebar)
  • High-strength (reaches up to 14,000 psi in 7 day
    break)

4
Important factors
  • Type of plasticizer
  • Dosage
  • Time of addition of superplasticizer
  • Amount of cement

5
Benefits
  • Reduce machine wear (concrete on picture will go
    from this 1 slump to 9 slump)
  • Better surface texture
  • Improve strength in less time
  • Reduce absorption
  • Eliminate fine cracks

6
Disadvantages
  • High cost
  • Brief action (picture restoration of the Queen
    Isabella Causeway after collapse in Sep. 15,
    2001, time was very important)
  • Need strong, sealed forms

7
References
  • http//www.chemisol.com
  • http//www.edpsciences.org
  • http//www.fhwa.dot.gov/infrastructure
  • http//www.fritzpak.com
  • http//www.precastconcretebc.com
  • http//www.reefball.org/adva
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