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

Authors

  • A. Izaguirre Facultad de Ciencias, Universidad de Navarra, Pamplona
  • J. Lanas CTH Navarra, Tajonar
  • J. I. Álvarez Facultad de Ciencias, Universidad de Navarra, Pamplona

DOI:

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

Keywords:

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

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.

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Published

2011-06-30

How to Cite

Izaguirre, A., Lanas, J., & Álvarez, J. I. (2011). Effect of a biodegradable natural polymer on the properties of hardened lime-based mortars. Materiales De Construcción, 61(302), 257–274. https://doi.org/10.3989/mc.2010.56009

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Research Articles