Materiales de Construcción, Vol 61, No 302 (2011)

Effect of a biodegradable natural polymer on the properties of hardened lime-based mortars


https://doi.org/10.3989/mc.2010.56009

A. Izaguirre
Facultad de Ciencias, Universidad de Navarra, Pamplona, Spain

J. Lanas
CTH Navarra, Tajonar, Spain

J. I. Álvarez
Facultad de Ciencias, Universidad de Navarra, Pamplona, Spain

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. 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 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, better mechanical properties and durability.

Keywords


lime mortar; polymer; mechanical properties; mercury porosimetry; durability

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