Interaction between cements with different composition and superplasticizers

H. Y. Ghorab; I. M. Kenawi; Z. G. Abdel All

doi:10.3989/mc.2012.63610

Autores/as

H. Y. Ghorab Helwan University
I. M. Kenawi Cairo University
Z. G. Abdel All Arab Dairy Products Co

DOI:

https://doi.org/10.3989/mc.2012.63610

Palabras clave:

cemento, superplastificantes, compatibilidad, fluidez, “minislump”

Resumen

Se ha estudiado el efecto fluidificante (hasta 90 minutos) ejercido por la incorporación de entre 0-1% de aditivos policondensados y policarboxilatos en pastas de cemento Portland, puzolánico, resistente a sulfatos y con adición de caliza. Con la incorporación de los aditivos policondensados, se produjo un incremento de la fluidez de los cementos Portland y puzolánico a mayores dosificaciones que las necesarias en los cementos resistente a sulfatos y con adición de caliza. Éste último presentó la mejor retención de la fluidez. Las fases aluminatos y sulfatos juegan un importante papel en la fluidez inducida. Todos los cementos incrementaron su fluidez con la incorporación de aditivos policarboxilatos a dosificaciones menores del 0,3%. El policarboxilato que no presenta en los espectros de RMN, resonancia asignada al protón de los grupos metil metileno, presenta buena retención de la fluidez. Esto es debido a la baja flexibilidad de la estructura y predominancia del efecto estérico. Este aditivo presenta también, mayor relación de grupos eter frente a grupos ester en los espectros IR, asi como una baja polidispersidad observada en la elución de especies de bajo peso molecular a través de HPLC.

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Citas

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