Effect of a biodegradable natural polymer on the properties of hardened lime-based mortars
Other Titles: 
Efecto de un polímero natural biodegradable en las propiedades de morteros de cal en estado endurecido
Keywords: 
Lime mortar
Structural applications
Starch polymer
Mechanical properties
Issue Date: 
Apr-2011
Publisher: 
CSIC
OpenAIRE: 
This work was funded by the Ministry of Education and Science of Spain (MAT2007-65478) and FUNA (Fundación Universitaria de Navarra)
ISSN: 
0465-2746
Citation: 
Izaguirre A; Lanas J; Alvarez JI. Mater Construcc 2011;61(302):257-274.
Abstract
As an environmentally friendly and energy-saving alternative to cement-based materials and to some chemically obtained water-reducers, a commercialized starch was incorporated into aerial lime-based matrix. Five different dosages were tested in order to study the influence that the amount of additive exerted on the properties of the material. Density, shrinkage, water absorption through capillarity, water vapour permeability, mechanical strengths, porosity, pore size distribution, and durability in the face of freezing-thawing cycles were studied in the polymer modified mortars. The tested starch acted as a thickener for dosages up to 0.30%, and changed its behaviour for the largest dosage (0.50%): in that case it behaved as a plasticizer, dispersing the lime through the fresh mass and generating a more workable material. As a result, the matrix of the hardened mortar presented great coherence, owing to its large density and low porosity, characteristics which led to lower capillarity and permeability absorptions, better mechanical properties and improved durability.

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