Rheology of lime pastes with biopolymer-based additives

Anna Arizzi, Phillip Frank Gower Banfill

Research output: Contribution to journalArticle

1 Citation (Scopus)
13 Downloads (Pure)

Abstract

The use of industrial limes implies obtaining mortar pastes with worse plasticity and workability compared to lime putties. To overcome this inconvenience, a great number of additives can be used, the majority of them being plasticisers and water-retaining agents. In this work three natural polysaccharides with hydrogel properties (agar-agar, alginate and hyaluronate derivatives) were added to dry-hydrated and natural hydraulic limes to investigate their influence on the rheology of the lime suspensions, as a function of the mixing and dissolving procedures, the additive type and concentration, and the type of lime. Rheological measurements have shown that the yield stress and viscosity of the lime pastes are increased if the additives are pre-mixed with water before adding the lime powder. All additives significantly increase the rheological
parameters of the natural hydraulic lime pastes (with a maximum additive concentration of 0.2 g in 1 L of water) but only sodium hyaluronate is effective when mixed with dry hydrated lime. Notwithstanding this, sodium hyaluronate-lime pastes have shown a time-dependent behaviour that must be taken into account during mortar formulation and use. This study lays the foundations for the development of new sustainable lime mortars made with additives derived from natural sources.
Original languageEnglish
Article number8
Number of pages17
JournalMaterials and Structures
Volume52
Issue number1
Early online date14 Jan 2019
DOIs
Publication statusPublished - Feb 2019

Keywords

  • Agar–agar
  • Lime
  • Plasticity
  • Sodium alginate
  • Sodium hyaluronate

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Materials Science(all)
  • Mechanics of Materials

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