PCE and BNS admixture adsorption in sands with different composition and particle size distribution

M. M. Alonso; R. Martínez-Gaitero; S. Gismera-Diez; F. Puertas

doi:10.3989/mc.2017.08116

Autores/as

M. M. Alonso Eduardo Torroja Institute for Construction Sciences (IETcc-CSIC) https://orcid.org/0000-0001-9096-752X
R. Martínez-Gaitero Eduardo Torroja Institute for Construction Sciences (IETcc-CSIC) https://orcid.org/0000-0001-7296-0850
S. Gismera-Diez Eduardo Torroja Institute for Construction Sciences (IETcc-CSIC) https://orcid.org/0000-0002-4094-2997
F. Puertas Eduardo Torroja Institute for Construction Sciences (IETcc-CSIC) https://orcid.org/0000-0002-4215-0184

DOI:

https://doi.org/10.3989/mc.2017.08116

Palabras clave:

Arena, Superplastificante, Arcilla, Finura, Compatibilidad

Resumen

La elección de un superplastificante (SP) para el hormigón es un proceso complejo, ya que las propiedades del producto final se relacionan con la naturaleza del aditivo y su compatibilidad con los componentes del hormigón. Sin embargo hay pocos estudios sobre la compatibilidad entre los SPs y arenas utilizadas en morteros y hormigones. En la práctica se ha demostrado que la finura y la composición mineralógica de la arena afectan a la demanda de agua y al consumo de SPs. Las arcillas que pueden encontrarse en las arenas pueden también adsorber aditivos, reduciendo la cantidad disponible en solución para la adsorción por el cemento. Se han analizado las isotermas de adsorción para SPs de tipo PCE y BNS en cuatro arenas de diferente finura y composicion comúnmente utilizado para preparar morteros y hormigones. El aditivo BNS no se adsorbe en las arenas, mientras que los PCE mostraron adsorción variable. Las curvas de adsorción revelaron que cuanto mayor es la finura de arena, menor la distribución del tamaño de partícula y mayor el contenido de arcilla mayor era adsorción/intercalación de aditivos PCE en las arenas.

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