The role of polymer addition on the properties of lime-based mortars

• Autores: José Javier Correa
• Localización: IX Congreso Internacional de Rehabilitación del Patrimonio Arquitectónico y Edificación: (9. 2008. Sevilla), Vol. 1, 2008, ISBN 978846123459z, págs. 21-26
• Idioma: español
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• Resumen

  • Natural polymers were often used in mortar mixtures during ancient period for improvement in their strength and durability. There are many examples of monumental structures, for whose mortars different types of natural organic additives were used, which are still in good condition proving their longevity.

    The use of natural polymers, as an additional component of repair mortars used for restoration purposes, seems to meet the compatibility issues that should be followed in the case of monumental structures.

    In the present work the influence of linseed oil on the properties of a series of lime-based mixtures is experimentally studied. Six compositions were prepared with different binders: pure lime, natural hydraulic lime, lime-pozzolan, lime-pozzolan-brick-dust and lime-pozzolan with 5% and 10% replacement of the binder content by cement. The ratio binder-aggregate was kept 1:3 for all of them. At first linseed oil was added at 1% by mass of binder. Other polymers are also planned to be added such as natural rubber latex. The effect on the properties of fresh and hardened mortar was measured so that a comparison between mortars with and without linseed oil can be made.

    The hardened mortars were tested at 90-day age since it is considered to be more representative of the final mortar strength because of the pozzolanic character of the mortars.

    Compressive and flexural strength, porosity, water absorption, specific gravity and capillarity measurements were performed. This work contributes to understanding the role of the organic polymers on the lime-based mortars.