Concrete superplasticizers
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Concrete Superplasticizers. By Felipe Perez. Developed in the 1960’s First used in Japan and Germany Introduced in the U.S. in the 1970’s Neutralizes the surface charges Causes dispersion Releases water in cement particles Reduces viscosity.

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Concrete Superplasticizers

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Concrete superplasticizers

ConcreteSuperplasticizers

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

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

What is a superplasticizer


Main purpose

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)


Important factors

Important factors

  • Type of plasticizer

  • Dosage

  • Time of addition of superplasticizer

  • Amount of cement


Benefits

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


Disadvantages

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


References

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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