Efecto de un polímero natural biodegradable en las propiedades de morteros de cal en estado endurecido

• Autores: Alberto Izaguirre Altuna , J. Lanas, J.I. Álvarez
• Localización: Materiales de construcción, ISSN 0465-2746, Vol. 61, Nº. 302, 2011, págs. 257-274
• Idioma: español
• DOI: 10.3989/mc.2010.56009
• Enlaces
  • Texto completo
• Resumen

  • Como alternativa a los materiales con base cemento y a plastificantes obtenidos por vía química, se estudió el efecto de un almidón comercial incorporado a morteros de cal aérea. Se ensayaron dosificaciones diferentes para analizar su influencia sobre las propiedades del material.

    En los morteros se determinaron densidad, retracción, absorción de agua por capilaridad, permeabilidad, resistencias mecánicas, porosidad, distribución de tamaños de poro y durabilidad frente a ciclos de hielo-deshielo. El almidón actuó como espesante hasta la dosis de 0,30%, pero cambió al añadirlo en la dosis más alta (0,50%): en este caso, se comportó como un plastificante, dispersando la cal a través de la mezcla en fresco, dando lugar a un material más trabajable. Como resultado, en la dosis 0,50%, la matriz del mortero endurecido presentó gran coherencia, por su mayor densidad y menor porosidad, lo que implicó una menor capilaridad y permeabilidad, mejores resistencias mecánicas y durabilidad.

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